Used ICs: IEC38R4765JZ, R2A20133D, SSC9527S, STD10NM50N(FET), EL817MB-DT(Photocoupler), R5F100BCAFP, IW7011A
Connector voltages
Circuit diagram
Click on the schematic to zoom in
Wednesday, May 10, 2017
How to enter service mode – Thomson DTH8040 DVD player – factory reset – SMPS (Transistorized) circuit diagram
Power supply board schematic, Initialization (Factory Reset) – Thomson DTH8040E, Thomson DTH8040U- DVD players
Service mode
> Connect the recorder to the mains
supply and a monitor television using SCART lead.
> Switch ON the recorder and then
press the Menu key on the remote control unit.
The recorders Main Menu will be
displayed n the screen of the TV.
> Simultaneously press the Play and
the Record keys on the front panel; and keep it depressed until the Service
Menu is displayed on the screen of the TV.
Service mode screen
To re-initialize (Factory Setting)
* Switch ON the recorder and wait until the Menu is displayed at the front panel display.
* Simultaneously press the Stop and Standby/ON keys on the front panel, until the display changes to read INIT and then release the keys.
* When the recorder has been re-initialized, the display will flash INT OK for a split second.
Now all the previous setting will be reset to the original factory setting.
SMPS (Power supply unit circuit diagram) and PWB
* Simultaneously press the Stop and Standby/ON keys on the front panel, until the display changes to read INIT and then release the keys.
* When the recorder has been re-initialized, the display will flash INT OK for a split second.
Now all the previous setting will be reset to the original factory setting.
SMPS (Power supply unit circuit diagram) and PWB
Click on the pictures to magnify
LGP3739-13PL1 – part code: EAY62810401, EAX64905301 power supply unit circuit diagram and Connector voltages
LG 37, 39 and 42 inch LCD TV power supply unit schematic – 39LN549E, 39LN575V, 39LN5300, 39LN5700-UH,
Used semiconductors: MAP3202SIRH, NR891D, SSCIS311A, MDF11N65B[FET]
On Condition: In a moment of Power ON Signal activated, the current of 3.5V output should be limited within 40mA(Max) at LCD TV condition for stability.[Do not turn “Power ON” Signal on at the load condition of 3.5V output, more than 40mA]
Total regulation for each output circuit includes the results of input voltage variation, load variation, warm-up drift and temperature change.
Maximum input Wattage Rating: Under 85W
The following instruments shall be used for measuring ripple noise.
1. Probe having impedance ratio of 1:1.
2. Oscilloscope having frequency characteristic of 100MHz or more.
Ripple and noise are measured at the end of output cable which are added a 0.1uF ceramic capacitor and 47uF electrolytic capacitor.
Connector voltages
Click on the schematic to zoom in
Burn-in
More than 2 hours at 45℃(±5℃), Normal input voltage.
AC on/off must be test 1 time after burn-in.
80% Load of specification.
This Power Supply has above-mentioned protections.
Short circuit protection between different output terminals is not considered.
Trip point for over voltage indicates the operating point when the output voltage slowly increases.
The conditions of Over Current measurement
Multi output (3.5V,12V,24V) is nominal load state except an over current measurement.
Monday, May 08, 2017
Sanyo CE28DF-C (Europe)- how to enter service mode, service adjustments - Flyback transformer [LOT] number - 645 003 3094
Memory
initialization, Gray scale adjustments, AGC and AFT adjustments, system control
IC pin description and more… TDA8362,TDA7263, LA7833
Power source: ac 220~240v 50hz
Television system system: b/g, i,l/l’
Color system: PAL/SECAM
Receiving channel VHF: E2~E12
CATV: x,y,z, S1~S41
UHF: #21~#69
Aerial input impedance - 75Ohm
Power
supply
The power supply circuit of the EB3-A chassis is composed of a rectifier smoothing circuit, an oscillation circuit, a control circuit and an output rectifier circuit. the ac input voltage is full-wave rectified by the rectifier smoothing circuit, and an unstable dc voltage is generated at both terminals of the smoothing capacitor C307. This voltage is input to the oscillation circuit. The oscillation circuit is provided with a blocking oscillator circuit that switches the switching FET Q301 on and off, and an oscillation frequency and a duty square wave pulse are generated in the input winding according to operation of the control circuit. A square wave pulse whose size is dependent on the turn ratio of the input and output winding is obtained in the output winding. This is rectified in the output rectifier circuit, and the desired dc voltage is obtained.
The power supply circuit of the EB3-A chassis is composed of a rectifier smoothing circuit, an oscillation circuit, a control circuit and an output rectifier circuit. the ac input voltage is full-wave rectified by the rectifier smoothing circuit, and an unstable dc voltage is generated at both terminals of the smoothing capacitor C307. This voltage is input to the oscillation circuit. The oscillation circuit is provided with a blocking oscillator circuit that switches the switching FET Q301 on and off, and an oscillation frequency and a duty square wave pulse are generated in the input winding according to operation of the control circuit. A square wave pulse whose size is dependent on the turn ratio of the input and output winding is obtained in the output winding. This is rectified in the output rectifier circuit, and the desired dc voltage is obtained.
IF
& deflection (TDA8362)
the if output signal from the tuner passes through the saw filter, and it is input to pin45 and pin46 of IC101. the signal input to the IC passes through the if amplifier, video detection and video amplifier circuits and is output from pin7 as a composite video signal. And after this signal is converted to impedance at Q122, supplies to the video and chroma amplifier stages. The sync.-separation circuit separates the video signals applied to pin13(internal video signal) or pin15(external video signal) to vertical- and horizontal-sync signals respectively. The horizontal oscillator requires no external components and is fully integrated. The oscillator is always running when the start-pin36 is supplied with 8v. Horizontal drive signal is output from pin37. VR401 is for adjustment of the horizontal centering. The separated vertical-sync signal from sync: separation circuit passes through the vertical-separation circuit, and applied to trigger divider circuit. the horizontal oscillation pulse and input vertical sync. pulse are monitored by the trigger divider circuit, and switching 50Hz and 60Hz system, the vertical amplitude automatically adjusted for 50Hz and 60Hz. the output signal from the trigger divider is triggered vertical oscillation circuit consisting of C401, R402 and pin42, and vertical drive pulse is output from pin43. VR451 is for changing the amount of AC feedback applied to pin41 and for adjustment of the vertical amplitude.
the if output signal from the tuner passes through the saw filter, and it is input to pin45 and pin46 of IC101. the signal input to the IC passes through the if amplifier, video detection and video amplifier circuits and is output from pin7 as a composite video signal. And after this signal is converted to impedance at Q122, supplies to the video and chroma amplifier stages. The sync.-separation circuit separates the video signals applied to pin13(internal video signal) or pin15(external video signal) to vertical- and horizontal-sync signals respectively. The horizontal oscillator requires no external components and is fully integrated. The oscillator is always running when the start-pin36 is supplied with 8v. Horizontal drive signal is output from pin37. VR401 is for adjustment of the horizontal centering. The separated vertical-sync signal from sync: separation circuit passes through the vertical-separation circuit, and applied to trigger divider circuit. the horizontal oscillation pulse and input vertical sync. pulse are monitored by the trigger divider circuit, and switching 50Hz and 60Hz system, the vertical amplitude automatically adjusted for 50Hz and 60Hz. the output signal from the trigger divider is triggered vertical oscillation circuit consisting of C401, R402 and pin42, and vertical drive pulse is output from pin43. VR451 is for changing the amount of AC feedback applied to pin41 and for adjustment of the vertical amplitude.
Video
chroma & r.g.b. (tda8362)
The composite video signal output from the pin7 of ic101 passes through q122/q124, and it is supplied to pin13. The external video signal output from SCART is supplied to pin15. The video signal input to pin13 or pin15 is separated to luminance (y) signal and chroma signal in IC101. These pins are used in common with h/v-sync; separation input. The peaking of y signal is adjusted by dc voltage of pin14. (“sharpness” control) the chroma signal is divided into r-y and b-y chroma signals, demodulated in IC101, and output from pin30 (R-Y) and pin31 (B-Y). These chroma signals pass through the 1h delay line circuit (IC270), and they are input to pin29 (R-Y) and pin28 (B-Y). These R-Y/B-Y signals pass through RGB matrix circuit and RGB selector circuit of IC101. the internal RGB signals are generated in RGB matrix circuit and the RGB selector, consisting linear amplifiers, clamps and selects either the internal rgb signals or the external rgb signals input
from pin22(R), pin23(G), pin24(B). Selection is controlled by the voltage at the RGB switch control (pin21) and mixed RGB modes are possible since RGB switching is fast. The RGB switch also functions as a fast blanking pin by blanking the RGB output stages; here internal and external RGB signals are overruled. The color gain is controlled by dc voltage of pin26. (“Color” control)
The contrast control voltage present at pin25, and the brightness control voltage present at pin17 controls dc level of RGB signals. The RGB signals are finally buffered before being available at the RGB output pins [pin20 (R), pin19 (G), pin18 (B)]
The composite video signal output from the pin7 of ic101 passes through q122/q124, and it is supplied to pin13. The external video signal output from SCART is supplied to pin15. The video signal input to pin13 or pin15 is separated to luminance (y) signal and chroma signal in IC101. These pins are used in common with h/v-sync; separation input. The peaking of y signal is adjusted by dc voltage of pin14. (“sharpness” control) the chroma signal is divided into r-y and b-y chroma signals, demodulated in IC101, and output from pin30 (R-Y) and pin31 (B-Y). These chroma signals pass through the 1h delay line circuit (IC270), and they are input to pin29 (R-Y) and pin28 (B-Y). These R-Y/B-Y signals pass through RGB matrix circuit and RGB selector circuit of IC101. the internal RGB signals are generated in RGB matrix circuit and the RGB selector, consisting linear amplifiers, clamps and selects either the internal rgb signals or the external rgb signals input
from pin22(R), pin23(G), pin24(B). Selection is controlled by the voltage at the RGB switch control (pin21) and mixed RGB modes are possible since RGB switching is fast. The RGB switch also functions as a fast blanking pin by blanking the RGB output stages; here internal and external RGB signals are overruled. The color gain is controlled by dc voltage of pin26. (“Color” control)
The contrast control voltage present at pin25, and the brightness control voltage present at pin17 controls dc level of RGB signals. The RGB signals are finally buffered before being available at the RGB output pins [pin20 (R), pin19 (G), pin18 (B)]
Audio output (TDA7263M)
The audio signals output from the audio unit are input to pin1(L) and 5(R) of ic581 and passes through the preamplifier circuit and drive circuit, after which it is input to the audio amplifier. The audio amplifier is an SEPP (Single-Ended, Push-Pull) OTL type and output to pin8(R) and 10(L) to directly drive the speakers
Vertical output (LA7833)
an IC (LA7833) is used for the vertical output circuit in this chassis. The vertical drive pulse from pin43 of ic101 is input to pin4 of IC451. This pulse drives IC451; and vertical scanning is performed. In the first half of scanning a deflecting current is output from pin2 and
passes through the following path:
vcc(b4) > d451 > pin3 > pin2 > dy > c461 > vr451/r459. an electric charge is then stored in c461.
In the last half of scanning the current path is c461 > DY > pin2 > pin1 > vr451/r459 > c461. in this way, an amplifying saw tooth waveform current flows directly to DY to perform electron beam defection.
Next, in the first half of the banking period the vertical drive pulse suddenly becomes off, and in order to reduce the current flowing to DY, the current path becomes as follows by the inductance of DY:
DY > pin2 > pin1 > vr451/r459 > c461 > dy. also, when the charge of DY has dissipated, the current path becomes vcc24v > pin6 > pin7 > c452 > pin3 >pin2> dy > c461 > vr451/r459, and when the prescribed current value is reached, the vertical drive pulse becomes on. This completes one cycle.
Horizontal output
A horizontal oscillation signal is output from pin37 of ic101 and switches the drive transistor Q431. This switching signal is current amplified by the drive transformer T431 and drives the output transistor Q432.
When Q432 becomes on, an amplifying current flows directly to DY through c441/442 > DY > q432 > Gnd, and defection is performed in the last half of the scanning period. Next, when Q432 becomes off, the charge that had been stored in DY up to that point releases a
resonance current to the resonant capacitors c420 and c423 and charges them. The current stored in c420 and c423 is then flowed back to DY, and an opposite charge is then stored in DY. This opposite charge then switches the damper diode in Q432 ON, the resonance state is completed, and an amplifying current is then flowed again directly to DY through the dumper diode. By this means, deflection in the first half of the scanning period is performed, and when Q432 becomes on at the end of the first half of the scanning period, deflection during the last half is begun, thus completing one cycle.
CPU pin description
pin1: h-sync. input (horizontal pulse for osd)
pin2: v-sync. input (vertical pulse for osd)
pin3: colour control output
pin4: brightness control output
pin5: contrast control output
pin6: sharpness control output
pin7: tint (gnd)
pin8: tv/av output (l:av mode)
pin9: av mode selection output-a
pin10: av mode selection output-b
pin11: natioal select option
pin12: i2c bus scl (serial clock for memory)
pin13: i2c bus sda (serial date for memory)
pin14: not used (+5v through pull up resistor 22k)
pin15: ident signal input (l:no signal)
pin16: r/c signal input
pin17: av1 scart control signal input (vtr play:l)
pin18: av2 scart control signal input (vtr play:l)
pin19: ignor output
pin20: 50/60hz output
pin21/22: gnd
pin23: supply ground
pin24: oscillator input for cpu
pin25: oscillator output for cpu
pin26: supply ground
pin27: power supply(+5v)
pin28: oscillator output for osd
pin29: oscillator input for osd
pin30: reset input
pin31: protect signal input (l:power circuit defects)
pin32: not used(gnd)
pin33: aft signal input.
pin34: text/16:9 select option
pin35: key scan 1
pin36: p-on(text)
pin37: s-vhs output
pin38: gnd
pin39: bg/i select output
pin40: l/l’ select output
pin41: neg/pos select output
pin42: not used (gnd)
pin43: 16:9/4:3 switch output
pin44: not used (gnd)
pin45: not used (gnd)
pin46: not used (gnd)
pin47: mute output in no picture(ftz mute)
pin48: power on/off output (h:on)
pin49: blanking output for osd
pin50: not used (open)
pin51: green output for osd
pin52: red output for osd
Power
supply adjustment
1. set vr351 to be mechanical centre before pressing the main switch.
2. tune the receiver to pal circular pattern.
3. set brightness and contrast controls to normal.
4. connect digital v-meter to test point "tp-b".
5. by using vr351, adjust voltage to 150 ± 0.5 v.
1. set vr351 to be mechanical centre before pressing the main switch.
2. tune the receiver to pal circular pattern.
3. set brightness and contrast controls to normal.
4. connect digital v-meter to test point "tp-b".
5. by using vr351, adjust voltage to 150 ± 0.5 v.
AFT
adjustment
1. b/g/i area : tune the receiver to the clearest station on system bg. by using t121, adjust aft to obtain the best picture.
2. l/l’ area : tune the receiver to vl station on system l/l’. by using vc141, adjust aft to obtain the best picture.
3. if bg/i and l/l’ can be received adjust 1 and 2.
1. b/g/i area : tune the receiver to the clearest station on system bg. by using t121, adjust aft to obtain the best picture.
2. l/l’ area : tune the receiver to vl station on system l/l’. by using vc141, adjust aft to obtain the best picture.
3. if bg/i and l/l’ can be received adjust 1 and 2.
AGC
adjustment
Note: Do not attempt this adjustment with weak signal.
1. tune the receiver to the clearest station.
2. set AGC vr(vr120) in direction which causes snow noise to appear, then in the opposite direction until snow noise just disappears.
Note: Do not attempt this adjustment with weak signal.
1. tune the receiver to the clearest station.
2. set AGC vr(vr120) in direction which causes snow noise to appear, then in the opposite direction until snow noise just disappears.
Grey
scale adjustment
screen vr adjustment
1. tune the receiver to the white pattern.
2. set brightness control to display centre and contrast control to normal.
3. set sw220 to "service" position.
4. set vr602 and vr612 to be mechanical centre.
5. turn vr601, vr611 and vr621 fully counter-clockwise.
6. set screen vr for one colour to be just visible.
bias vr adjustment
7. by using vr601, vr611 or vr621, adjust line to be white.
8. set sw220 to "normal" position.
drive vr adjustment
9. by using vr602 and vr612, adjust white balance.
screen vr adjustment
1. tune the receiver to the white pattern.
2. set brightness control to display centre and contrast control to normal.
3. set sw220 to "service" position.
4. set vr602 and vr612 to be mechanical centre.
5. turn vr601, vr611 and vr621 fully counter-clockwise.
6. set screen vr for one colour to be just visible.
bias vr adjustment
7. by using vr601, vr611 or vr621, adjust line to be white.
8. set sw220 to "normal" position.
drive vr adjustment
9. by using vr602 and vr612, adjust white balance.
High voltage & width adjustment
[high voltage adjustment]
1. tune the receiver to pal circular pattern.
2. set brightness and contrast controls to maximum.
3. connect digital v-meter to both terminals of r232(left side)(+) , and high voltage meter to CRT anode.
4. confirm high voltage to be 26.0 ± 1 kv at beam current 1.3, and less than 29.0 kv at 0 beam current .
[h-width adjustment]
5. adjust vr462 to obtain proper H- width.
6. reconfirm high voltage.
H-center adjustment
1. tune the receiver to circular pattern.
2. adjust h-center by using vr401.
1. tune the receiver to circular pattern.
2. adjust h-center by using vr401.
V-centre
adjustment
1. tune the receiver to circular pattern.
2. adjust V-center by using sw451.
V-size adjustment
1. tune the receiver to circular pattern.
2. adjust v-size by using vr451.
focus adjustment
by using focus vr, adjust focus control for well scanning lines.
1. tune the receiver to circular pattern.
2. adjust V-center by using sw451.
V-size adjustment
1. tune the receiver to circular pattern.
2. adjust v-size by using vr451.
focus adjustment
by using focus vr, adjust focus control for well scanning lines.
Initialization of memory IC
[When you replace a memory ic (IC731), it is necessary to initialize the IC as follows.]
1. Press and hold the function button on the TV set and then press the recall button on the RC transmitter, the following picture will appear on the screen. [Service mode]
Item -1 set> 0
2. Confirm set number of all items is "0" by pressing the function button.
3. If it is not "0", change to "0" by the level (+/-) button. (Changing the set number, automatically memorized.)
4. Press the recall button, to return the normal TV mode.
Stereo separation setting
1. To enter the service mode, press and hold function button on the tv set and then press the function button on the rc transmitter. the following picture will appear on the screen.
k2 > 32 [k2=service code, 32=service number]
2. set the service codes and numbers as below;
k1 > 16
k2 > 32
to change the service code, press the function button.
to change the service number, press the level (+/-) button.
3. Press the recall button to return to the tv mode.
4. Confirm the sound quality with stereo signal receiving.
Sunday, May 07, 2017
Daewoo DTT3250, DTT3250MT CTV - How to enter service mode, adjustments, SMPS, deflection and audio output circuit diagram
STR X6757 (SMPS control), TDA8172A (Vertical output IC), BSC29-0185F (FBT)
THE ADJUSTMENT METHOD OF CP-750 WITH USER ROMOTE CONTROLLER (R-49C05)
Service Mode
To enter the service mode, press Red button and Green button and MENU key on (Ch.91)
Service Mode 1 is displayed.
To enter the service mode, press Red button and Green button and MENU key on (Ch.91)
Service Mode 1 is displayed.
Press MODE key.
Service Mode 2 is
displayed.
CONTROL KEY
MENU - Return to former step
OK - Exit service mode
PR ▲/▼ - Select item
VOL ▲/▼- Change value or condition
SCREEN
ADJUSTMENT
Service Mode 1 > DDPC 3316_1 > Screen
Adjust Screen Volume of FBT until the horizontal line is just disappeared.
FOCUS ADJUSTMENT
Adjust with the Focus volume on the FBT until you get the most clear resolution of 350 line
and corner of screen.
Focus volume on the FBT is consisting of two parts - vertical focus and horizontal focus.
WHITE BALANCE ADJUSTMENT
Service Mode 1 > DDPC 3316_1 > Screen
Adjust Screen Volume of FBT until the horizontal line is just disappeared.
FOCUS ADJUSTMENT
Adjust with the Focus volume on the FBT until you get the most clear resolution of 350 line
and corner of screen.
Focus volume on the FBT is consisting of two parts - vertical focus and horizontal focus.
WHITE BALANCE ADJUSTMENT
Service Mode 1 > Tube Measurement > WD_R, WD_G
Adjust R,G bars in the high beam on the instrument may be located in the center.(B DRV is Fixed.)
(2) Low-Beam Adjustment
Service Mode 1 > Tube Measurement > CUT_R, CUT_G
Adjust R,G bars in the low beam on the instrument may be located in the center.(B BIAS is Fixed.)
[The reference coordinates are X = 288, Y = 302”]
PWB bottom view, SMPS and deflection schematic
Adjust R,G bars in the low beam on the instrument may be located in the center.(B BIAS is Fixed.)
VERTICAL CENTER Adjustment
Service Mode 1 > Vertical Geometry > Ver. Center
Adjust to harmonize RETMA pattern’s upper marking with Lower marking.
VERTICL SIZE Adjustment
Service Mode 1 > Vertical Geometry > Ver. Size
Adjust so that the Upper and the Lower ‘4’ marks of the RETMA pattern may be located at the boundaries of the screen.
HORIZONTAL CENTER Adjustment
Service Mode 1 > Hor. Geometry > Hor. Center
Adjust to harmonize the position of RETMA pattern’s Left side with Right side.
HORIZONTAL WIDTH Adjustment
Service Mode 1 > Hor. Geometry > Hor. Width
Adjust so that the Left and the Right ‘5’ marks of the RETMA pattern may be located at the boundaries of the screen.
PINCUSHION Adjustment
(1) Parabola Adjustment
Service Mode 1 > Hor. Geometry > Cushion
Adjust so that the Left and Right edge’s vertical line may be straight.
(2) Corner Top/Bottom or Top 6th/Bottom 6th
Service Mode 1 > Hor. Geometry > Corner Top/Corner Bottom or Corner Top 6th/Corner Bottom 6th
Adjust so that the Upper and the Lower corner’s vertical line may be straight.
(3) Trapeze Adjustment
Service Mode 1 > Hor. Geometry > Trapeze
(4) Angle Adjustment
Service Mode 1 > Hor. Geometry > Angle
(5) Bow Adjustment
Service Mode 1 > Hor. Geometry > Bow.
Saturday, May 06, 2017
TCL LE32E1600 – Side-lit LED LCD TV –– SMPS schematic
Power supply regulator board circuit diagram – TCL Side lit type LCD TV - TCL LE32E1600
Product Name: Side light type LCD TVProduct Model: LE32E1600;
Product movement: MST6M182
Remote control: RC06
Universal remote control set-up code to check with TCL brand TVs: 0398
Debugging instructions only for LCD TV movement debugging, commissioning before the need for all parts of the circuit assembly test, so that the Part of the circuit components without error, contact, leakage, leakage welding, when the part of the circuit in line with the circuit schematic and assembly requirements before Start debugging, debugging equipment used in advance must be metering, proofreading, to ensure accuracy, or shall not be used.
Instrument, instrument, operating tool configuration:
A. suitable for 6M182 movement of a LED tooling machine
B. a digital voltmeter
C. AC power supply one
D. factory standard signal cable input system
E. 40MHz dual trace oscilloscope.
Inspection
methods
A. the motherboard and the appropriate tooling machine connected to connect the
company debugging signal.
B. turn on AC 220V power supply, the machine into standby mode, press the remote
control or the control of the boot button, boot into the standard state.
C. Press the remote control "program +" "program -" key to
check the program number of the image and audio signals, should have color
card, box, vertical Cards, color bars, digital photos, three primary colors and
other different types of images and audio signals, requiring no leakage, such
as leakage, Fill
this signal with automatic search or manual search
D. receive PAL color test card signal, with the remote control volume, balance,
contrast, brightness, color, sharpness control, Sound, the picture should be
changed
E. TV standard check: receive PAL-D / K standard images and audio signals, in the
search can automatically identify the image system and
sound system; check the other images and sound system is correct.
F. external terminal input and output check: press the "source" button,
the machine installed on the "source" menu, including: TV, AV, COMPONENT,
PC, HDMI, USB, oscilloscope should be able to observe the corresponding sound,
video input and output signals, tooling machine On the image and sound signal
should be normal. Also need to detect whether the AV output signal is normal.
Power
supply and LED driver circuit diagram
Products
directly with AC power supply, power supply voltage on the TV back cover signs
on the instructions. Connect one end of the AC power cord to the TV
The
rear terminal tag is inserted into the power port and the other end is
connected to the power outlet to complete the power connection. In a lightning
or pay when the power supply is powered off, unplug the power plug and the
antenna plug. The power cord does not allow any other things to be tipped or
wound in the above, do not place the power cord where it may be destroyed.
Precautions
The
display is a precision display device, the screen has a bright spot, dark
spots, or red, green, blue and the like a little dead pixels
This
is a normal phenomenon, not a bad product. A, the display screen for a long
time to display the same still picture, it will leave a TV A
blur, this damage is caused by improper use. The TV in the connection of
various systems, the system may not match With the phenomenon, especially when
connected to the computer, some graphics cards may not match, and the machine
only to identify the refresh rate of 60HZ.
SMPS Iinverter part schematic
LED Driver schematic
Click on the pictures to zoom in
As
the machine uses an embedded operating system, the software is more complex,
may be in the work or standby software problems, such as If the restart can
return to normal, it is not a fault.
Case
prevention measures, product use and routine maintenance knowledge.
LCD
screen material: the LCD screen looks like a solid black screen, in fact, this
layer of the screen manufacturers will add a layer of special coating. The main function of this layer of special coating is
to prevent the user in the use of other light source reflective
and glare, while strengthening the LCD screen itself, the color contrast effect.
But because the manufacturers use this layer of plating Membrane materials are
not the same, of course, its durability will be different. So the user in the
clean, do not:
You
can wipe the screen surface with any alkaline solution or chemical solution.
LCD panel stains are generally divided into species, one is due For the
accumulation of dust in the air, one is the user inadvertently left the
fingerprints and oil.
As
the LCD panel itself is a complex physical structure design, so when wiping the
LCD panel, do not use unknown cleaning solution, but cannot use water and
alcohol solution. There are three errors here
1,
with a soft cloth (glasses cloth) or paper towels to wipe the LCD screen, it is
recommended to use a dedicated LCD wipes do not with
glasses cloth and paper towels to wipe the LCD screen, it is easy to scratch
the "squeamish" LCD screen. You can use a special LCD wipes such as Supermax2020 in the LCD panel gently wipe, in general, fingerprints and oil
The
dirty is not as easy as the former, but it is not a problem if you use a
dedicated LCD wiping cloth For the special LCD wipes used in special fibers,
with a higher than ordinary high-end glasses cloth wipe the effect of more, and
And soft will not scratch the screen, but also has the unique function of
dissipating static electricity; special reminder: the general cloth and paper
towel is LCD panel killer.
2,
with clean water LCD screen. The use of water, liquid easily into the liquid
crystal display and equipment inside, so Will cause the device circuit to
short-circuit, thus burning expensive electronic equipment. For fingerprints
and oil, water is still powerless.
3,
with alcohol and some other chemical solvents to clean the LCD screen. In
general, alcohol is a commonly used organic solution Agent, can dissolve some
dirt is not easy to wipe, if only used to clean the display shell, but also no
adverse effects.
But
do not use alcohol to clean the LCD screen, because now the LCD screen, are
coated with a special coating on the screen, So that the screen has a better
display, once the use of alcohol to wipe the monitor screen, it will dissolve
this layer of special coating, Display effect adversely affected. With chemical
solvents even more undesirable, this chemical on the "arrogant" of
the LCD panel Jane Straight is a devastating blow. If your screen is
accidentally stained with fruit juice, saliva or coffee is not easy to clean stains,
do not use paper towels or glasses cloth and the like to wipe hard, because it
is easy to wipe the stains at the same time also Scrape the LCD screen; you can
use liquid crystal special wipes such as SupermAX2020 sprayed with no amount of
ionized water Supermax2020
slightly moist, and then go to wipe, you cannot only stains without traces of
your LCD screen screen.
6,
the main technical parameters (including the movement used, screen, power
supply specifications)
Friday, May 05, 2017
LG42LE8500-850N, LG42LE8800-8900 SMPS circuit diagram
LG42LE8500-850N 42LE8500/850N-ZA, LG42LE8800-8900 42LE8800/8900-ZA
LGP42010LF, LGP42-10LA, LGP42-10LC Power supply unit circuit diagram
EAY60869402, EAY60869403, EAY60869405 – EAX61124201/13(LG backlight inverter)
On Condition : In a moment of Power_ON Signal activated, the current of 3.5V output should be limited within 40mA(Max) at LCD TV condition for stability.
Do not turn “Power_ON” Signal on at the load condition of 3.5V output, more than 40Ma.
Total regulation for each output circuit includes the results of input voltage variation, load variation, warm-up drift and temperature change.
The following instruments shall be used for measuring ripple noise.
1. Probe having impedance ratio of 1:1.
2. Oscilloscope having frequency characteristic of 100MHz or more.
Ripple and noise are measured at the end of output cable which are added a 0.1uF ceramic capacitor and 47uF electrolytic capacitor. ( connected parallel )
Main inverter circuit
LED driver citcuit
Click on the schematics to magnify
Monday, May 01, 2017
LG CM4350 Mini Hi-Fi System - How to upgrade the software, Power supply troubleshooting – SMPS schematic
LG CM4350, LG CMS4350F
Hidden key mode
Push
both Front key and RCU key to activate it for 5 seconds.
Disc Lock On/Off (CD Function Only Active)
Front Key : STOP
RCU Key : STOP
Check Version and Option code
Disc Lock On/Off (CD Function Only Active)
Front Key : STOP
RCU Key : STOP
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+/-.
RCU Key : PLAY/PAUSE
You can change [Audio MCU Version <-> CD Controller Version <-> EEPROM Option] by SKIP+/-.
Clear
EEPROM
Front Key : STOP
RCU Key : SKIP-
Front Key : STOP
RCU Key : SKIP-
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.
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.
Bluetooth DUT
Front Key : STOP
RCU Key : PROGRAM
Bluetooth model only
Power Disc Lock On/Off (CD Function Only Active)
Front Key : STOP
RCU Key : EQ
Amp Clip On/Off
Front Key : STOP
RCU Key : Mute
Amp Clip Mode Change (Amp Clip On > Amp Clip Off > Level Down display)
Service information for EEPROM
> POWER ON
> FLD no disc status or AUX status.
> Remote control ‘Fwd skip’ + Front ‘STOP’ push same time for about 5 seconds.
> FLD ‘OP-0….
> Move to appropriate position and make changes with remote control ‘skip, mode, play’ key.
> Press the ENTER key.
> FLD ‘write ok.
> Remote control ‘Fwd skip’ + Front ‘STOP’ push same time.
> FLD ‘E2P CLR
Completed.
SMPS Circuit diagram
No power - troubleshooting
If
the unit doesn’t work by no power problem, repair the set according to the
following
FUSE & BRIDGE DIODE
> Check and replace F901, BD901, TH901 or TH903 on SMPS board.
> Check if the fuse F901 is open or short-circuit.
> Check if the bridge diode BD901 is short-circuit by over current with a digital multi meter.
> Check if the NTC thermistor TH901 or TH903 is normal or open.
FUSE & BRIDGE DIODE
> Check and replace F901, BD901, TH901 or TH903 on SMPS board.
> Check if the fuse F901 is open or short-circuit.
> Check if the bridge diode BD901 is short-circuit by over current with a digital multi meter.
> Check if the NTC thermistor TH901 or TH903 is normal or open.
If
the unit doesn’t work by no power problem, repair the set according to the
following
> Check and replace D951 on SMPS board.
> Check the anode-cathod voltage of D951 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.
> If it doesn’t have any voltage, it’s destroyed. Replace it with a new one.
> Check and replace D951 on SMPS board.
> Check the anode-cathod voltage of D951 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.
> If it doesn’t have any voltage, it’s destroyed. Replace it with a new one.
Program
download & update
MCS
PROGRAM
Download program file name must be - HG520_FW_CM4750_DATE.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.
Download program file name must be - HG520_FW_CM4750_DATE.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.
[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.]
On VFD display screen
> No USB [insert USB device at USB function]
> Search
> Firmware
> Finish
Power
off manually [when completed, remove USB device.]
Eq
program
Download program file name must be
*CM4350: EQ_PRG_CM4350_***.BIN
*CM4450/CM4550: EQ_PRG_CM4550_***.BIN
*CM4650/CM4750: EQ_PRG_CM4750_***.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.
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.
Download program file name must be
*CM4350: EQ_PRG_CM4350_***.BIN
*CM4450/CM4550: EQ_PRG_CM4550_***.BIN
*CM4650/CM4750: EQ_PRG_CM4750_***.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.
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.
On VFD display screen
> No USB [insert USB device at USB function.]
> Search
> Eq up
> Finish
Power off automatically [when completed, remove USB device]
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