Monday, October 31, 2016

Bush DLED32165HDDVD and Vestel 32 inch LCD TVs SMPS Circuit diagram and Sharp CRT TV 21D2G CRT TV schematic

Bush DLED32165HDDVD and Vestel 32 inch - LCD TV SMPS 17IPS11 – schematic
Used ICs: MP3394 – SG6742HR – FQPF9N50C(FET) 
Click on the pictures to zoom in
Sharp 21D2-G / Sharp 21D2-S – CRT TV circuit diagram .  Used ICs: F022SPE – TDA9302H(Vertical Output) – STR-G5653 (Power Switching STR) – VTUCTF55(Tuner) – AN7523(Audio Output) – IX3368CE(System chroma jungle) – AT24C04/BR34C04/M24C04W(Memory) 
DUNTKA541WEG1(Main board) - schematic
CRT base board

Saturday, October 29, 2016

AOC Envision L905A LED monitor- How to enter service mode - SMPS circuit diagram

AOC Envision L905A - AOC Envision Techview EN9410 – AOC F19L – AOC E936SWA LED LCD monitor - power supply regulator board 715G3189P01LED001S and 715G3189P02LED001S schematic - service mode. ICs used: TOP255EN – AO4828L – TA9690GN – OZ9954SN 
Factory mode of AOC 
Turn off the power.
Press the ‘’ key, and the‘’ key and press the Power button at the same time, 
Next, press the Menu button, You will enter into the factory mode.
Turn the Power-button off to quit from factory mode.
SMPS Schematic and PWB
Click on the pictures to zoom in

Jbl CINEMA SB400 Powered sound bar with powered wireless 8” Subwoofer Circuit diagram

Midrange transducers: Two 2-1/4" (57mm) cones per channel
High-frequency transducer: One 1" (25mm) dome per channel
Amplifier power: 60 watts peak per channel
Power requirement: 100V – 240V, 50Hz/60Hz, 60W
Power consumption: <0.5W (standby); 60W (maximum)
Dimensions (H x W x D): 3-3/4" x 43-5/16" x 2-1-2"  (95mm x 1100mm x 64mm)
Weight (shipping): 7.3 lb (3.3kg)
Low-frequency transducer: One 8" down-firing cone
Amplifier power: 100 watts
Enclosure type: Ported
Power requirement: 100V – 240V, 50/60Hz, 100W
Power consumption: <0.5W (standby); 100W (maximum)
Dimensions (H x W x D): 14" x 13" x 12-5/8"  (355mm x 329mm x 320mm)
Weight (shipping): 23.1 lb (10.5kg)
Power
3.3v supply pins are provided on either side of the module.  These pins are all internally connected inside of the SiP and are provided for convenience so that Ginseng can be powered from either the left or right sides to make routing a PCB convenient for various applications.  It is generally recommended to power the 3.3V bus from only one side of the SiP. The pins on the other side should be shunted to ground through a 0.1uF and 1uF set of capacitors.
XPD
The XPD port is a SPI bus used for loading module firmware during development and mass production and also for debugging. One of the following two styles of XPD port connectors should be included on all motherboard designs that use Ginseng to ensure that loading code and debugging can be done easily. The XPD port interfaces to the XPD module which provides an interface to a host computer via RS-232 or USB. The XPD port operates from the VCC bus. To ensure proper functionality of the XPD interface, be sure to minimize the amount of capacitance on the XPD lines. Note: the XPD_RESET / EXT_RST pin is tolerant up to 1.8V MAX -- if control of the Reset pin is desired, a series diode must be used to guarantee the input voltage does not exceed the 1.8V max.
Customers can purchase an XPD Programming Module and ribbon cables from Eleven Engineering, or build their own based on the Schematic, BOM, Assembly Drawing, and Gerber files, which are all available from Eleven without charge. The XDE download program is also available from Eleven’s website without charge.
Digital IO
Ginseng has general purpose digital IO (“GPIO”) pins available for use by the application firmware. GPIO pins use the same logic voltage as the 3.3V pin and have the following software configurable features:  IO direction, drive strength (for output only), Schmitt Trigger (for input only), pull up (input only), pull down (input only), slew rate (output only). Ginseng is also capable of active-high and active-low configuration of LEDs.
Circuit diagram (Schematic)
Amplifier
HDMI port connector
Main board-full
BLUETOOTH OPERATION
To wirelessly stream audio to the soundbar from a Bluetooth-enabled device:
1. Confirm that the soundbar is in the Bluetooth pairing mode (the Bluetooth button LED will be flashing blue). If the LED is not flashing blue, press and hold the Bluetooth button until its LED begins to flash blue.
2. Place the device in the pairing mode. Use the device’s Bluetooth pairing menu to pair it with the soundbar. (The soundbar will appear as “SB400” in the device’s menu.) If the device requires a passcode, use 0000.
3. When the soundbar’s Bluetooth button LED illuminates constantly, it is paired with the device and you can stream audio via Bluetooth from the device to the soundbar.
To listen to audio from the Bluetooth device, press the Source button repeatedly until the Bluetooth Source Indicator LED illuminates.
To disconnect the Bluetooth device, press and hold the soundbar’s Bluetooth button until the LED begins flashing. To pair the soundbar with a different Bluetooth-enabled device, repeat Steps 1 – 3 with the
new device.
Bluetooth button (soundbar only): Press this button to play the audio stream from a paired Bluetooth device through the soundbar. (The Bluetooth Source Indicator LED will illuminate when a paired Bluetooth device is the active source.) Press and hold this button to force the soundbar into the Bluetooth pairing mode.
After turning the soundbar and subwoofer on for the first time, you will need to “pair” the subwoofer and soundbar so they both operate at the same wireless frequency. To pair the units, press the Wireless Pairing
switches on both units within 30 seconds of each other. The units will communicate with each other and operate at the same frequency.
NOTE: The maximum wireless operating distance between the soundbar and subwoofer is approximately 50 feet (15.3m)
Wireless Pairing switch and LED
Press this switch to initiate wireless pairing between the subwoofer and the soundbar.
The LED lights blue continuously when the sub-woofer is ON and linked to the sound bar.
The LED slowly flashes blue when the sub-woofer is ON and the wireless link is not established between the sub-woofer and the soundbar.
The LED rapidly flashes blue during the wireless pairing process.
Click on the pictures to magnify

Philips 26PF9531-1- LED TV power supply schematic

26 inch LED LCD TV  - Philips 26PF9531 - Power supply circuit diagram. Used ICs: TNY256P – LM399 – MC33368P – MC34063AD – MC34067P – LM317T - L4973V3.3 – TEA1507P
Display supply: Filter Standby (Click on the schematics to magnify)
Display supply: FHP protection
Display supply: Preconditioner
Display supply: LLC
Display supply: AUX

Wednesday, October 26, 2016

BN44-00261A Samsung LCD TV – LE32B530P – LE32B550 – LN32B530P – LN32B350F - schematic

Used ICs: Used ICs: KIA393 – STR-W6252 – FAN7530 – SEM2006 -Samsung 30 inch and 40 inch LCD TV SMPS
Circuit diagram [Click on the schematics to zoom in]

Tuesday, October 25, 2016

PWL3708B-SMPS TCL LCD TV power supply – working principle and repair procedure

ON37A switch power supply.
About ON37A Power Supply
The circuit adopt PFC control IC NCP1653 and PWM control IC NCP1377,it has over voltage protection, over current protection, over hot protection function etc. IC’s Follow Boost pattern can increase whole circuit efficiency at low voltage, increase dependable stability, and it can eliminate noise on some point of load, it makes the unit’s performance steadier.

Click on the pictures to zoom in
Please take a printout of the SMPS schematic; and follow the working principle.  It will make easy to understand.  The working principle of almost all LCD SMPS is similar. So knowing the working principle will make it easy to repair most of it.
Input Circuit
When turns on the power switch, AC220V/50Hz passes common model filter consisted of fuse F801, RV801, C819, L806, LF802, LF801, R824 etc, it will restrain multiplicative electromagnetism interference from power supply circuit and eliminate high frequency interfere pulse from electricity net voltage.  After BD1 bridge commutate , about 300V direct current output.
DC 300V is processed by each control circuit.
Standby Start-up Circuit
After being commutated to output 300v voltage ,one way is through D819.R832 connecting with transformer T803’s primary coil , pin3 connect with pin5/Pin6/Pin7/Pin8 of IC U4,through U4 inner start circuit connect with pin4 VDD of U4, cause U4 ‘s Source-Drain switch on, so that it makes the T803’s primary coil work , so secondary coil output inductive 5V standby voltage.
DC 300V after Standby Start-up Circuit 1 commutating 3’s secondary winding pin4 is separated 2 ways , one way output 15V VCC voltage ,supply power to IC , the other way through diode connect with pin4 of U4 to supply power for U4
After commutating, output voltage of the secondary winding’s pin6 is sampled via R838, The sampling voltage input pin1 of U3, and the current occur between the pin3 and pin4 of photo coupler U3.The change of the current input pin4 and pin3 of U4, and the U4 adjust PWM to control transformer to output steady 5v standby voltage.
Standby Control Circuit
While connecting AC power supply, the standby circuit wait to start.
Others control circuit units can startup After the standby circuit work under normal situation .Then the main transformer start working, and output power supply 24V and 12V.
Power On
When the control unit send one high level signal via pin3 of P802 to pin B of Q808 through R842, R841, D819, Q808 turn on. In the meantime, pin1 and pin2 of photo coupler U2 is on, so inductive current pass pin3 and pin4 of U2. It makes pole B of Q807 has low level and turn on.  The 15V supply power VCC1 and VCC2 to pin6 of U5 and pin8 of U6  otherwise, when pin3 of P802 send a control signal which is low level. The signal passes R842.R841.D819 to pole B of Q808 and Q808 shut down, then pin1 and pin2 of photo coupler U2 open, therefore it doesn’t wok, pin4 and pin3 of U2 open too, then Q807 shut down, 15V VCC power supply voltage can’t supply VCC2 and VCC1, and U5 and U6 can’t get the working voltage, so U5,U6 stop working.
PFC Circuit
While VCC1 is about 15v voltage to supply pin8 of U6 (NCP1653A), U6 start working, and pin7 of U6 output pulse signal to pole B of Q801
The pulse signal control Q801 turning on and shutting down, so it makes L801 repeat save energy and discharge power, After being commutated, the voltage increase to about 390v, filtered by C807 send to PWM circuit.
PFC circuit adjustment is finished by pin1/pin3/pin4of U6 .
Bridge rectifier output voltage through resistance R860.R1.R864.R865.R867 and connect with pin3 of U6,for input voltage limit controlling.
PFC circuit output voltage passes R862, R86, R863, R866 to connect with pin1 of U6.  As feedback signal , inner circuit of U6 adjust and control pulse width signal output from pin7.In addition, it is over voltage protection function .  The negative current of PFC circuit passes R869 to connect pin4 of U6.
PWM Circuit
When VCC2 is about 15v voltage and connect with pin6 of U5,U5 start working to make pin5 of U5 export pulse control signal to pole B of Q805 and Q802.
When the pulse signal is high level,Q805 cut off and Q802 turn on. VCC2 passes Q802/R813 to charge up C820. when the pulse signal is low level, Q802 cut off and Q805 turn on. C820 discharge from Q805. As C820 repeats charging and discharging , that make pin1 and pin2 of transformer T802 primary coil discharging or charging, so there is the inductive current in pin6 &pin5 and pin4 & pin3of secondary coil. The drive signal control Q803 and Q806 to close and open.
For Q803 and Q806 close and open to make output voltage of PFC circuit which connect with primary coil of the transformer to repeat saving energy and release energy. So the inductive output voltage of secondary coil export 24V and 12V to main board.
Regulated Voltage Circuit
Regulated voltage Circuit is controlled by U5 and export 24V through R803 connecting with pin1 and pin2 of U1.  Because of photo coupler , inductive current occur between pin3 and pin4 of U1, and pin4 of U1 connects with pin2 of U5. The feedback signal will be sent to inner of U5 to adjust the pulse output from pin5 of U5 which keep transformer T801 output steady voltage.
Over Voltage Protection
Output circuit of +24V and +12V connect with rectifier diode D804 and D806, then incorporate the them into one way then pass D809/R856 to connect with pole B of Q812.  While work normally, pole B of Q812 is low level, then Q812 and Q810 cut off.  When main voltage 24V and 12V is over voltage , pole B of Q812 is high level, then pole B of Q810 is high level, so that Q812 turn on to makes Q810 turn on, through diode D820 connecting with resistance R842 to pull the voltage down. That makes the power on high level signal not work, which equal to turn off signal. So the power shuts down; and stops working.
Over Current Protection Circuit
In 12V output circuit, pin13 of secondary winding of transformer connects with R908 and R902 to pin2 of U7A.  While over current occur, pin1 of U7A exports negative voltage and pin7 of U7B exports negative voltage too. The negative voltage connects with the pole B of Q801 to make the Q810 turn on, then passes D820 and connect with R842. That makes the voltage of this point go down quickly.  So high level of turning on signal doesn’t work equaling to turning off signal. The power shuts down and stop working.
Repairing
1 A 40W or 60W filament type [Do not use CFL or similar type]  bulb is necessary to be connected between the AC lines and lest the power board damaged.  The bulb will twinkle if the PWB is good. The input power is about several decades Watt. You can measure 12V and 24V can be measured when P-ON voltage is given or connected with 12V;If the bulb is lightening and no output is detected, the PWB still need further repairing.
2 Possible defective causes: 
* defective Design
defective Material
Producing engineering problem:  short circuit(soldering-connected, pin-shorted),open-circuit(false soldering, pin-unconnected)
3 Troubleshooting steps:
If the fuse is OK and no output, IC is possibly damaged or shut down under protective status. The other side, if the fuse is broken, you should check more parts like IC, MOSFET, Diodes, Zener diode etc.
You should know the pin functions of IC
Checking IC2 and IC6, 13V DC supply to VCC with no AC input. Test the voltage of PIN2 if the voltage is 4.2VDC or not, and test if the output pulse width decrease or not by an oscilloscope. If not, replace the IC.
4 Holes of double-face board , small copper wire will easy open when the power board pass oven ,it’s not easy to be found, the places where is easy open are MOSFET S pole to grounding, drive circuit and ISENCE circuit.
5 Component check: transformer /inductance /photo coupler /TL431 on the power board aren’t easy to damage , most MOSFET damage is like G-S short circuit ,G-D-S short circuit, even crack, most transistors damage are as B-E short circuit, C-B-E short circuit even crack., diode damage is as short circuit. Zener diode damage is open circuit even crack. IC2 damage is possible ground to output(D1) short circuit or less than 0.5; ground to VCC(D1)short circuit or less than 0.5 even crack.
Resistor damage is the resistance value increase even crack. SMD Capacitor damage is crack or capability too large ; electrolytic capacitance damage is crack, plump , electrolyte leakage.

TCL LCD TV SMPS – PWL3711C – repair procedure and the working principle

PWL3711C Switch Power Supply
Please take a printout of the SMPS schematic, and then refer the description.  It will make easy to understand the functional operation.  The working principle of almost all LCD SMPS are similar.  So, understanding about one; will help to  repair others too.
Click on the pictures to magnify
AC Input and EMI Filtering Circuit
PWL3711C power supply is composed of anti-interference circuit, bridge commutation circuit, filter circuit, PFC( Power factor Correction) circuit and switch stabilized voltage circuit and so on. The merits of switch power supply are wide operation voltage, low power consumption, high power reaching over 98%.
It has many protection functions such as OCP, OVP and over heat protection.
The switch power supply has two operation conditions:
1) Normal-Normal work when power on;
2) Standby-When TV set standby, switch power supply is in narrow pulse operation condition and change to under voltage condition, then the output voltage goes down to half value of normal condition;
The theory introduction of each part of the switch power supply as following:
 Anti-interference circuit
When switch on, the commercial AC220V/50Hz passes common-mode filter composed of fuse F1,ZV1, R1, CX1, CX2, LF1, LF2 to eliminate the all the EMI and high frequency interference pulse from power input port.  X capacity and Y capacity are both safety capacitance. The difference of them is that X capacitance is connected to AC input port to eliminate difference-mode interference, Y capacitance is connected between AC input and ground to eliminate common-mode interference. Y capacitance has two kinds, one is Y1 capacitance belonging to double insulation Y capacitance and connecting between primary coil and second coil, the other is Y2 capacitance belonging to basic single insulation Y capacitance and connecting between primary coil to protect ground.
Commutating Filter Circuit
BD1, C1, C2 compose bridge commutating circuit to convert the 220 AC to 300 DC filtered by C3.
PFC Circuit
PFC circuit is composed of IC1(NCP1650), Q1, L2 and the other external components.
NCP1650 Power Factor Controller Introduction
NCP1650 chip is an active, power factor correction controller that can operate over a wide range of input voltages, and output power level. It is designed to operate on 50/60Hz power system. This controller offers severl different protection methods to assure safe, reliable operation under any conditions.
1 Feature:
Fixed Frequency OperationAverage Current Mode PWMContinuous or Discontinuous Mode OperationFast Line/Load Transient CompensationTrue Power Limiting CircuitHigh Accuracy MultipliersUnder voltage LockoutOvervoltage Limiting ComparatorBrown Out ProtectionRamp Compensation Does Not Affect Oscillator AccuracyOperation from 25 to 250kHz
PFC circuit of PWL3711C is fixed frequency average current mode boost converter. PFC circuit operates in two stages: 90Vac 132Vac is the low input stage for PFC output 260VDC;180Vac 264Vac is high input stage for PFC output 390VDC. The shift stage is 140Vac165Vac completed by comparator IC10. When input commercial current in high stage, the level of pin 3 of IC10 is higher than pin2, then Q21 turns on to make sample voltage of IC1 FB(pin6) go down and make the output voltage of PFC go up to 390VDC.
The operation frequency is about 70KHz.The output current changing should follow input voltage changing to go to pin5/pin12 of IC and the voltage entering pin6 of IC. When the inner parameters are compared and calculated to confirm the operation duty ratio and maintain the stabile voltage. Under the stable output power, the input voltage decrease, minimum duty ratio of the output pulse width of IC1 larger. When input voltage increases, the minimum duty ratio of pulse width output will decrease; vice versa.  In an output cycle, duty ratio of IC1 pulse width output is mutative in which there is a minimum duty ratio on the highest point of Vac.
Q1 alternating with D1 produce output current of bridge commutating diode to flow continuously, and the angle of flow go to 180 so that the current of AC has the same phase with voltage of AC . The waveform is sine wave, and the power factor of system should approach to 1.
DC-DC Shift:
12V Section: IC6-NCP1377

NCP1377 PWM Current-Mode Power Supply Controller
NCP1377 combines a true current mode modulator and a demagnetization detector which ensures full borderline/critical Conduction Mode in any load/line conditions together with minimum drain voltage switching. Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens at low peak current, no audible noise can be heard.
The transformer core reset detection is done through an auxiliary winding which, brought via a dedicated pin, also enables fast Over Voltage Protection. Once an OVP has been detected, the IC permanently latches-off. The 1377 features a sampling time of 4.5us whereas it is 1.5us for the B
version.
The NCP1377 also features efficient protective circuitries which, in presence of an over current condition, disables the output pulse and enters a safe burst mode, trying to restart.  Once the default has gone, the device auto-recovers. Finally an internal 1.0 ms soft-start eliminates the traditional startup stress.
Features
Free-running borderline/critical mode
Quasi-resonant operation
Lockout OVP
Auto-recovery short-circuit protection via
UVLO crossover
External latch triggering, e.g. via overtemperature signal
Current-mode with adjustable skip-cycle capability
Internal 1.0 ms soft-start
Internal temperature shutdown
Internal leading edge blanking
500mA peak current source/sink capability
Under voltage lockout level of 12.5V (On) and 7.5V(Min)

Direct optocoupler connection.
Pin8 of IC6 connects R101 to “+”end of C16 via internal 4mA constant-current source to charge C34. When reaches about 12.5V, output of pin5 of IC6 is pulse width waveform and 4mA constant-current sourse will shut off, then auxiliary winding of transformer T2 supplies C34.  Because of PFC circuit, voltage of C16 is constant, and the changing of duty ratio of IC6 is only with output load. At the moment of output loads enhance, 12V drops and the current of IC8 reduces, then level of pin12 of IC6 goes up, so largens pulse width duty ratio of IC6 and makes the turn-on time longer to make transformer transmit more energy. Output of 12V goes up to larger turn-on current of IC8.
In fact, under output load changeless, IC6 also performs the above adjustment, but the adjustment amplitude is slight. Output constant voltage relies to above closed loop adjustment, so that forms output voltage ripple form.
24V Section
24V branch section is basic sameness to 12V section, but only little difference in function of IC NCP1217(IC2) is current mode PWM controller, applying to offline switch power supply.
Feature
1 Current-mode with adjustable skip-cycle capability
2 Built-in internal ramp compensation
3 Auto-recovery internal output short-circuit protection
4 Internal 1.0ms soft-start
5 Fixed frequency versions at 65kHz, 100kHz and 133kHz
Switch Voltage Regulated Circuit
Power Supply DC Output
24V/4A power supply branch: One way goes directly to primary winding passing primary winding 1-3 to pin D of Q2/ Q17; the other way passing D3 and goes directly to pin8 of IC2 connecting internal circuit of IC to pin6 to charge C21. When the voltage set point reaches 12.5V, IC2 operates normally and internal circuit latches off between pin6 and pin8, then C21 discharges through internal circuit of IC2. At the same time, output of pin5 is driving signal to Q2/Q17 which turns on, so the primary winding of T1 turns on to store the energy.
When C21 discharge to 5.6V, the discharge circuit shuts off and driving signal of pin5 latches off , so each secondary winding of T1 induces output voltage via to energy shift.  At the same time, secondary winding pin6 charges C21 through L5/D7, when reaching 12.5V, pin5 of IC2 sends out drive signal to Q2 and Q17 which turns on, so primary winding of T1 turns on to enter new save energy loop process and ensure inducing constant output voltage from each secondary winding.
When output of secondary reaches over 24V, the current of photocoupler IC3 enhances as R24 sample voltage largens, so that photo coupler shines strongly to feedback to pin2 of IC2, the point voltage of this pin going low. Output signal of pin5 of IC2 shuts off to adjust duty ratio.  12V/4A power supply branch: One way to primary winding 1-3 of T2, then to D pin of Q5; the other way via D11 to pin8 of IC6(NCP1377), connecting internal circuit of IC6 to charge C34, when voltage of C34 reaches 12.5V, IC6 starts up to operation, and the internal circuit disconnects from pin6 and pin8. C21 discharges via internal circuit of IC6, and pin5 exports drive signal to make Q5 turns on, so connects primary winding of T2, and T2 starts saving energy.  When C21 discharges to 5.6V, the discharge circuit will shut off, and output drive signal will stop from pin5. For energy shift, inducing output voltage produces from each secondary winding of T2.
At the meantime, secondary winding pin6 charges C34 via D13/R37, when the voltage reaches 12.5V to drive pin5 to export drive signal, Q5 turns on and connects primary winding of T2, then renews to save energy to ensure constant inducing output voltage from each secondary winding.  When output voltage of secondary winding reaches 12V, the current of passing photocoupler IC8 enhance, so the photocoupler shines strongly to feedback to pin2 of IC6, the level of this pin goes down to output signal of pin5 of IC6 shuts off to adjust duty ratio to ensure constant output voltage 12V.
Over-Current Protection
24V/4A supply power branch
The sample current passes R20 to get the sample voltage which on R17 to connect internal circuit of pin3 of IC2. When the sample current reaches a certain rated value, IC2 stops to work and protects the circuit.
12V/4A supply power branch
The sample current passes R39 to get sample voltage which is on R42 to connect internal circuit of IC6’s pin3. When the sample current reaches a certain rated value, IC6 would stop to work to protect the circuit.
OVP Circuit
12V/4A Supply Power Branch
Secondary winding pin5 of T2 connects IC6’s pin1 via R35, when testing circuit of IC6 test the voltage over the rated value, IC6’s pin5 stops to export drive signal to make Q5 shut off.  When canceling the test signal, IC6’s pin5 exports drive signal again to make Q5 turn on and continue to operate
24V/6A Supply Power Branch
when the output is higher than 31V, so ZD2 and ZD3 work normally and signal 24V-OVP is high level. Q3  pinC connects to ground. The current between pin1and pin2 of IC3, so inner diode shines strongly, the current larger between pin3 and pin4. This signal is sent to pin2 of IC2 to latch off the drive signal. The power is off.When the high level signal 24V-OVP is sent to pinB of Q12, Q12 turns on to the ground. The photo coupler is shines strongly and the current of receiver increases. So the low level is sent to pin8 of IC2 to shut off the power.
Power Standby
When plug in AC commercial current, the 12V of power supply continues to operate, power supply standby circuit control is only for 24V supply.
Remote control signal connect P2’s pin1 via J2’s pin4 to passing R33 to B pin of Q4. When receives power on signal, the B pin of Q4 is low level, Q4 turns on and Q12 shuts off
Power off 
When receives the remote signal low, Q4 shuts off and Q12 turns on. Because of induction action of photocoupler, the level of IC2’s pin2 is pulled low, so IC2 stops to operate Power on: when receives power on high level signal, Q4 turns on and B pin of Q12 equals to connect ground. For photocoupler doesn’t work, IC2’s pin2 releases and this set point voltage is high level. IC2 renews to operate to export drive signal from pin5, so the circuit exports 24V power supply.
There are two supply outputs: +12V and + 24V by different transformer in this power supply solution. When TV switch on, +12V output is ok to all the boards; then send standby signal to power on, +24V output to the panel.  If HV is higher than130V, but High and Low Voltage Converter Circuit don’t work, +12V and +24V output will be still ok.
Repairing
1 A 40W or 60W filament type (Do not use CFL or other type) bulb is necessary to be connected between the AC lines and lest the power board damaged.
The bulb will twinkle if the PWB is good. The input power is about several decades Watt. You can measure 12V and 24V can be measured when P-ON voltage is given or connected with 12V; if the bulb is lightening and no output is detected, the PWB still need further repairing.
2 Possible defective cause 
a) defective Design 
b) defective Material 
c) Producing engineering problem: short circuit(soldering-connected, pin-shorted),open-circuit(false soldering, pin-unconnected)
3 Troubleshooting steps
 a) If the fuse is OK and no output, IC is possibly damaged or shut down under protective status. The other side, if the fuse is broken, you should check more parts like IC, MOSFET, Diodes, Zener diode etc.
b) You should know the pin functions of IC
Checking IC2 and IC6, 13V DC supply to VCC with no AC input. Test the voltage of PIN2 if the voltage is 4.2VDC or not, and test if the output pulse width decrease or not by an oscilloscope. If not, replace the IC.
4 Holes of double-face board , small copper wire will easy open when the power board pass oven it’s not easy to be found, the places where is easy open are MOSFET S pole to grounding, drive circuit and ISENCE circuit.

5 Component check: transformer /inductance /photo coupler /TL431 on the power board aren’t easy to damage , most MOSFET damage is like G-S short circuit ,G-D-S short circuit, even crack, most transistors damage are as B-E short circuit, C-B-E short circuit even crack., diode damage is as short circuit. Zener diode damage is open circuit even crack. IC2 damage is possible ground to output(D1) short circuit or less than 0.5; ground to VCC(D1)short circuit or less than 0.5 even crack.

Resistor damage is the resistance value increase even crack. SMD Capacitor damage is crack or capability too large ; electrolytic capacitance damage is crack, plump , electrolyte leakage .

Sunday, October 23, 2016

BN44-00121X power supply-Back-light inverter – Digirama LCD TV

Digirama LED LCD TV SMPS circuit diagram - BN44 00121X - Used ICs: FSQ0465 – OZ9938B1
Circuit diagram (Schematic) (Click on the schematic to magnify)


Philco PH48S61DG and PH28S63D Power supply board [SMPS] schematics

Philco PH28S63D – Philco PH48S61DG - 28inch and 48 inch LED TVs – SMPS circuit diagrams
PH28S63D Used ICs: OB2273B – MDF4N60BTH(FET) – OB3350E - Circuit diagram (Click on the circuit diagrams to zoom in)
PH48S61DG  Used ICs: FAN7930 – 13N50/TO220(FET) - FSFR1700 – OZ9916 Circuit diagram

LG CM8340 SMPS and Power amplifier Circuit diagram – Software update – Mini Hi-Fi system

LG CM8340, LG CMS8440F Mini Hi-Fi System Firmware update procedure – power supply regulator schematic
 AMPLIFIER
Total 1,900 W
Streo mode 380 W x 4
Sub-woofer 380 W
FRONT SPEAKER
Type 2 Way 2 Speaker
Impedance 6 Ω
Rated Input Power 380 W
Max. Input power 760 W
SURROUND SPEAKER
Type 1 Way 1 speaker
Impedance 6 Ω
Rated Input Power 380 W
Max. Input power 760 W
Net Dimensions (W x H x D) (335 x 445 x 300) mm
Net Weight 8.8 kg
HIDDEN KEY MODE
Push both Front key and RCU key to activate it for 5 seconds.
1. Disc Lock On/Off (CD Function Only Active)
„ Front Key : STOP
„ RCU Key : STOP
2. Check Version and Option code
„ Front Key : STOP
„ RCU Key : PLAY/PAUSE
„ You can change [Audio MCU Version <-> CD Controller Version <-> EEPROM Option] by SKIP+/-.
3. Clear EEPROM
„ Front Key : STOP
„ RCU Key : SKIP-
4. Edit EEPROM
„ Front Key : STOP
„ RCU Key : SKIP+
„ You can change the digit of option by SKIP+/-.
„ You can edit 0~f by REPEAT or PLAY/PAUSE key.
5. Bluetooth DUT
„ Front Key : STOP
„ RCU Key : PROGRAM
„ Bluetooth model only
6. Power Disc Lock On/Off (CD Function Only Active)
„ Front Key : STOP
„ RCU Key : EQ
7. Amp Clip On/Off
„ Front Key : STOP
„ RCU Key : Mute
Amp Clip Mode Change (Amp Clip On > Amp Clip Off > Level Down display)
SMPS and Power Amplifier circuit diagram [Click on the pictures to zoom in]
AMP & CD-DSP schematic
PROGRAM DOWNLOAD & UPDATE
AUDIO PROGRAM
Download program file name must be MICOM_CM8540_1311010_0x4D3F.HEX
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Downloading file proceeds in the same way at USB1 function and USB2 function.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.
CD PROGRAM
Download program file name must be HG480_CM8540_1401231.bin
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Downloading file proceeds in the same way at USB1 function and USB2 function.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.
DEMO PROGRAM
Download program file name must be DEMO_DAT.bin
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Downloading file proceeds in the same way at USB1 function and USB2 function.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.
Q PROGRAM
Download program file name must be EQ_PRG_CM8340_201401140_59CC.BIN
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Downloading file proceeds in the same way at USB1 function and USB2 function.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.

AOC L22W831 - 715T2783 1B SMPS circuit diagram – Service mode - WB adjustment

715T2783 - 715T278313 SMPS schematic – used with AOC L22W831 LCD TV
White Balance (W/B) adjustment
Approximately 2 hours should be allowed for warm up before proceeding white balance adjustment.
Before started adjust white balance, please set the Ca210 Channel to 05 Channel and set it’s mode to xyLv mode.
How to setting the Ca210 channel, you can reference to Ca210 user guide or simple use the ― Memory CH up or down to set the channel to 05 channel, and use the ―Mode key to set the mode to xyLv.
Following is the procedure to do white-balance adjust
Factory mode (Service Mode)
Turn on the TV, press MENU key with remote control, then press number key 1 > 9 > 9 > 9. It will achieve the factory mode.
Select the item of White Balance and press right key to enter it.
Select “source” like PC/AV/S-VIDEO/HDMI, then select “color temp” to adjust the corresponding R/G/B values.
In the White Balance you can adjust following items.
1-3 items is RG, GG, BG
à R, G, B Gain adjust.
4-6 items is RO, GO, BO
à R, G, B Bias adjust.
7 item is Colortemp_all_Mode adjust, color temperature select: Cool, Normal, and Warm.
8 item is Def_brightness_all_mode adjust
9 item is Def_contrast_all_mode adjust
Note
1. Set the input signal format of PC as 1024x768 @60 Hz, AV as NTSC system, YPbPr as 576I, HDMI as 1080I
2. Before adjusting all color temp, make PC and YPbPr auto color first.
3.The model usually needn’t to be adjusted W/B, only to make auto color.
SMPS 715T2783-1B - Schematic
Click on the pictures to magnify

715T2802F AOC L47H861 LCD TV power supply schematic – Factory Mode

AOC 47 inch LCD TV – L47H861 SMPS circuit diagram - Service mode – White Balance adjustment
How to enter Service Mode (Factory Mode)
Pressing number key 9 > 8 > 7 > 6 will achieve the factory mode.
Press “Exit” button on remote control to quit from factory mode.
White Balance, Luminance Adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.
Before started adjust white balance, please set the Ca210 Channel to 03 Channel and set it’s mode to xyLv mode.
Note: The tolerance of the color coordinates should be less than ± 5
How to setting the Ca210 channel, you can reference to Ca210 user guide or simple use the “Memory CH” up or down to set the channel to 03 channel, and use the “Mode” key to set the mode to xyLv.
Following is the procedure to do white-balance adjust
Note: We can only the HDMI white balance to cover the white balance of all source mode, This method is meet to the Zoran 780 software.
HDMI mode1. In the TV mode adjust volume to zero, press mute key, then press number key 9 > 8 > 7 > 6. It will achieve the factory mode. Select the item of White Balance and press right key to enter it.2. Before to adjust the white balance, press the factory mode OSD of “Reset”, to reset all white balance factory setting.
In the White Balance you can adjust 8 items.
1-3 items is RO, GO, BO > R, G, B Bias adjust.
4-6 items is RG, GG, BG > R, G, B Gain adjust.
7 item is Def_contrast_all_mode adjust
8 item is Def_brightness_all_mode adjust
9 item is Colortemp_all_Mode adjust
10 item is color temperature select: Cool, Normal, and Warm.
Gain adjustment:
A. Adjust Cool color-temperature
1. Set the pattern generator to pattern 104 or 0 IRE pattern. And adjust the Item 8 to min luminance.
2. Switch the Ca210 to xyLv-mode (with press “MODE” button)
3. Switch the Ca210 channel to Channel 03 (with up or down “MEMORY CH” button)
4. The LCD-indicator on Ca210 will show x =272, y =278, Lv can adjust to max luminance.
5. Use the item 1 and item 3 to Adjust black balance :use 30 IRE(Pattern 115) signal,and adjust the black balance,until the Ca210 show x =272, y =278.
6. Use the item 4 and item 6 to adjust white balance: use 100 IRE (Pattern 105) signal, and adjust the white balance, until the Ca210 show x =272, y =278.
7. Adjust item 7 to check color temperature is saturation or not: Add by 7 steps and then to adjust the item 4 and item 6 to check the color temperature is saturation or not, until is saturation.
8. Enter the item 10 to select another color temperature to adjust.
Adjust Normal color-temperature
1. Set the pattern generator to pattern 104 or 0 IRE pattern. And adjust the Item 8 Cool color-temperature’s item 8 value.
2. Switch the Ca210 to T uvLv
-mode (with press “MODE” button)
3. Switch the Ca210 channel to Channel 03 (with up or down “MEMORY CH” button)
4. The LCD-indicator on Ca210 will show T=9300.
5. Adjust the 9 item: Colortemp_All_Mode_Normal, until Ca210 indicator reached the value T=9300
6. Adjust item 7 to check color temperature is saturation or not: Add by 7 steps and then to adjust the item 4 and item 6 to check the color temperature is saturation or not, until is saturation.
7. Loop the Item 5 and Item 6, until the T=9300 and RG/BG is saturation
8. Enter the 8 item to select another color temperature to adjust.
Adjust Warm color-temperature
1. Set the pattern generator to pattern 104 or 0 IRE pattern. And adjust the Item 8 Cool color-temperature’s item 8 value.
2. Switch the Ca210 to T uvLv
-mode (with press “MODE” button)
3. Switch the Ca210 channel to Channel 03 (with up or down “MEMORY CH” button)
4. The LCD-indicator on Ca210 will show T=6500.
5. Adjust the 9 item: Colortemp_All_Mode_warm, until Ca210 indicator reached the value T=6500
6. Adjust item 7 to check color temperature is saturation or not: Add by 7 steps and then to adjust the item 4 and item 6 to check the color temperature is saturation or not, until is saturation.
7. Loop the Item 5 and Item 6, until the T=6500 and RG/BG is saturation
8. Enter the 8 item to select another color temperature to adjust.
Press “Exit” button on remote control to quit from factory mode.
Power Supply [SMPS] circuit diagram
Four digit universal remote control set-up codes for AOC brand TVs: 0034 0129