SONY HOME THEATRE SYSTEM SA ST7 HT ST7 Test mode cold reset amp test DSP surround check SMPS Power supply circuit using STR-Y6766

SONY SAST7  HT-ST7  TEST MODE

TEST MODES OTHER THAN THE TEST MODE MENU
These are executable test mode even if not entering the test mode menu.
Cold Reset
It can initialize various backup information.
Procedure:
1. Press the [POWER] button to turn the power on.
2. Press the three buttons of the [INPUT], [VOLUME –] and [POWER] simultaneously.
3. The message “RESET” is displayed on the fluorescent indicator tube, then turn the power off.

TEST MODES IN THE TEST MODE MENU
These are the test modes done in the test mode menu.
Setting method of the test mode menu:
1. Press the [POWER] button to turn the power on.
2. Press the two buttons of the [INPUT] and [VOLUME +] simultaneously for five seconds.
3. The message “PANEL” blinks on the fluorescent indicator tube and enter the test mode menu.

Releasing method of the test mode menu:
Press the [POWER] button to release the test mode menu.

Panel Test Mode
It can confirm the lighting of fluorescent indicator tube and LEDs,
operation of buttons, display of model name, destination and software version.
Procedure:
1. Enter the test mode menu.
2. In the state of blinking the “PANEL” on the fluorescent indicator tube, press the [INPUT] button.
3. All segments in the fluorescent indicator tube and all LEDs are lighted up.
4. When pressing the [VOLUME +] button, the display on the
fluorescent indicator tube repeatedly changes in order from all lighting >  pattern 1 (power indicator LED (white color) is lighted up) >  pattern 2 (Bluetooth indicator LED (blue color) and [MUTING] LED are lighted up).

5. In the state of step 4, press the [VOLUME –] button and “K 0” is displayed on the fluorescent indicator tube.

Each time a button is pressed, “K 0” value increases. However, once a button is pressed, it is no longer taken into account. When pressing the all buttons, “OK” and “K 5” are alternately displayed on the fluorescent indicator tube.

6. In the state of step 4, press the [INPUT] button and model name “HT-ST7” is displayed on the fluorescent indicator tube.

Each time the [VOLUME +] button is pressed, the display changes from destination > MC (m-com) version > SY (system) version > UI version > TA (AMP) version > DS (DSP) version > BT (Bluetooth) version > NF (NFC) version > HD (HDMI) version, > CE (CEC) version > PF (platform) version > WS (wireless sound) version in this order, and returns to the model name display.

7. When [INPUT] button is pressed while the each version is displayed on the fluorescent indicator tube, year, month and day of the software creation is displayed on the fluorescent indicator tube.

When [INPUT] button is pressed again, the display returns to the each version display.

Releasing method:
Press the [POWER ] button to release the test mode menu. (When the “K 0” to “K 4” is displayed on the fluorescent indicator tube, press the [POWER] button on the remote commander to release the test mode menu)
Model Name Display Mode
It can display the model name.
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “HT-ST7”

Destination Display Mode
It can display the destination.
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the destination.

MC Version Display Mode
It can display the MC (m-com) version.
Procedure:
1. Enter the test menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “MC.X.XXX” (X.XXX: MC (m-com) version).

Serial Flash Version Display Mode
It can display the SF (serial flash) version.

Procedure:
1. Enter the test menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “SF.X.XXX” (X.XXX: SF (serial flash) version).

DSP Sound Number Display Mode
It can display the SN (DSP sound number) number.
Procedure:
1. Enter the test menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “SN XXX” (XXX: DSP sound number (000 to 998)).

Note: “SN ---” is displayed when the information of serial flash is not able to be acquired.

BT Module F/W Version Display Mode
It can display the BT (Bluetooth) module firmware varsion.
Procedure:
1. Enter the test menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “BTM.X.XX” (X.XX: BT (Bluetooth) module firmware version).

AMP Test Mode
(It is displayed “AMP” on the fluorescent indicator tube) Not used for the servicing.
Press the [POWER] button if having entered this mode.
Tone Test Mode
It can confirm the test tone output from each speaker.
Preparation:
Connect the Subwoofer (SA-WST7) and the Sound Bar (SA-ST7) by wireless.
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “T TONE”, press the [INPUT] button.
3. The message “TONE.ON” is displayed on the fluorescent indicator tube momentarily and enter the tone test mode.

4. The output speaker is displayed on the fluorescent indicator tube. At the same time, test tone is output from speaker. (The output speaker repeatedly changes automatically in following order)

Output speaker	Display
Front L-ch	L3
Surround Back R-ch	R1
Surround L-ch	L2
Surround R-ch	R2
Surround Back L-ch	L1
Front R-ch	R3
Center	C
Subwoofer	SW

Releasing method:

Press the [POWER] button to release the test mode menu.
Speaker Test Mode
(It is displayed “SPK.TST” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
VACS Display Mode
(It is displayed “V. DISP” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
VACS ON/OFF Mode
(It is displayed “V.ONOFF” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
DSP Halt Mode
(It is displayed “DSP.HLT” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
DSP Serial Flash Update Mode
(It is displayed “SF UPD” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
Stream Information Mode
(It is displayed “STREAM” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
HDCP Key Read Mode
(It is displayed “HDCP” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.
NFC Test Mode
(It is displayed “NFC.TST” on the fluorescent indicator tube)
Not used for the servicing.
Press the [POWER] button if having entered this mode.

Wireless Sound Test Mode
It can display the m-com version of Subwoofer (SA-WST7).
Note :More than one item may be displayed on the fluorescent indicator tube, but it is not used for the servicing other than “VER.CHE”.
Preparation:
# Prepare the remote commander attached to this unit.
Remote commander:
RM-AMU164
# Connect the Subwoofer (SA-WST7) and the Sound Bar (SAST7) by wireless..
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “WS TST”, press the [INPUT] button.
3. The message “QUALIT” is displayed on the fluorescent indicator tube momentarily and enter the wireless sound test mode.
4. Press the [UP ]/[DOWN] buttons on the remote commander, select the “VER.CHE”, and press the [ENTER] button on the remote commander.
5. The m-com version of Subwoofer (SA-WST7) is displayed on the fluorescent indicator tube.

6. When [UP]/[DOWN] buttons on the remote commander is pressed while the m-com version of Subwoofer (SA-WST7) is displayed on the fluorescent indicator tube, year, month and day of the creation is displayed on the fluorescent indicator tube.

When [UP]/[DOWN] buttons on the remote commander is pressed again, the display returns to the m-com version of Subwoofer (SA-WST7) display.
Releasing method:
Press the [POWER] button to release the test mode menu.

Wireless Sound Cold Reset
It can initialize various backup information of Subwoofer (SAWST7).
Preparation:
Connect the Subwoofer (SA-WST7) and the Sound Bar (SA-ST7) by wireless.
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “WS RST”, press the [INPUT] button.
3. The [POWER] indicator LED on the Subwoofer (SA-WST7) turns red and flashes, then turns on yellow.

4. Pull out the power cord on the Subwoofer (SA-WST7) from an outlet and insert the power cord again.
Cold Reset
It can initialize various backup information.
Procedure:
1. Enter the test mode menu.
2. Press the [VOLUME +]/[VOLUME –] buttons to select the “RESET”, press the [INPUT] button.
3. The message “RESET” is displayed on the fluorescent indicator tube, then turn the power off.

JVC XVS40BK XVS42SL XVS45GD XVS30BK SERVICE MODE AND MECHANICAL DISASSEMBLING

JVC  XV-S40BK - XV-S42SL - XV-S45GD  - XV-S30BK - service  mode and mechanical disassembling 

Disassembling

Loading assembly section

Removing the clamper assembly

Remove the four screws A attaching the clamper assembly.
Move the clamper in the direction of the arrow to release the two joints A on both sides.)

Removing the tray

Prior to performing the following procedure, remove the clamper assembly.

Push b of the slide cam into the slot on the left side of the loading base until it stops.
Draw out the tray toward the front.

Removing the traverse mechanism assembly

Prior to performing the following procedure, remove the clamper assembly and the tray.
Remove the four screws B attaching the traverse mechanism assembly.

Removing the elevator

Prior to performing the following procedure, remove the clamper assembly, the tray and the traverse mechanism assembly.
Extend each bar e inside of the loading base outward and detach the elevator shaft.

Removing the motor assembly

Prior to performing the following procedure, remove the clamper assembly, the tray, the traverse mechanism assembly and the elevator.
Remove the belt from the pulley.
Remove the screw C attaching the motor assembly.
Turn over the body and remove the screw D attaching the motor assembly.
Release the two tabs g retaining the motor board.

Adjustment method
(1) Initialization method
(2) Display of "Laser current value" and "Jitter value"
If microprocessor (IC401,IC402,IC403) or pick-up is replaces, initialize the
DVD player in the following matter
1)Take out the disc and close the tray.
2)Unplug the power plug.
3)Insert power plug into outlet while pressing both PLAY button and OPEN/CLOSE button.
4)FL Display indicate "TEST " . :Version, :Region code
5)Press 3D-PHONIC key button of remote controller. and EEPROM initialize start.
6)When indicate "DTS" on the display, initialize finishes.
7)The power is turned OFF, and Unplug the power plug.
1)Take out the disc and close the tray.
2)Unplug the power plug.
3)Insert power plug into outlet while pressing both PLAY button and OPEN/CLOSE button.
4)FL Display indicate "TEST " . :Version, :Region code
5)Press the "OPEN/CLOSE" button to move the tray outward.
Put the test disc (VT-501) on the tray and press "OPEN/CLOSE" button.
The tray should move inward (Note:Don't push to close the tray directly by hand etc.)
6)Press the "PLAY" button.
7)The laser current value and the jitter value is displayed on the FL

For Laser current value
The laser current value becomes 40mA for the above-mentioned.
Becomes a test mode by doing above-mentioned procedure 1) - 4). Afterwards, the laser current value can
be switched by pushing the key to remote control without turning on the disk.

Remote control "4" key --- Laser of CD
Remote control "5" key --- Laser of DVD
*Returns to a usual test mode by the thing to push the stop button of remote control.

If the laser current value is 64mA or less, it is roughly good. There is a possibility to which pick-up is deteriorated, and exchange pick-up, please when there are 65mA or more laser current value.

Check points for each error
(1) Spindle start error
1.Defective spindle motor
*Are there several ohms resistance between each pin of CN201 "5-6","6-7","5-7"?
(The power supply is turned off and measured.)
*Is the sign wave of about 100mVp-p in the voltage had from each terminal?
[ CN201"9"(H1-),"10"(H1+),"11"(H2-),"12"(H2+),"13"(H3-),"14"(H3+) ]
2.Defective spindle motor driver (IC251)
*Has motor drive voltage of a sine wave or a rectangular wave gone out to each terminal(SM1~3)
of CN201"5,6,7" and IC251"2,4,7"?
*Is FG pulse output from the terminal of IC251"24"(FG) according to the rotation of the motor?
*Is it "L(about 0.9V)" while terminal of IC251"15"(VH) is rotating the motor?
3.Has the control signal come from servo IC or the microcomputer?
*Is it "L" while the terminal of IC251"16"(SBRK) is operating?
Is it "H" while the terminal of IC251"23"(/SPMUTE) is operating?
*Is the control signal input to the terminal of IC251"22"(EC)?
(changes from VHALF voltage while the motor is working.)
*Is the VHALF voltage input to the terminal of IC251"21"(ECR)?
4.Is the FG signal input to the servo IC?
*Is FG pulse input to the terminal of IC201"53"(FG) according to the rotation of the motor?

(3) Traverse movement NG

1.Defective traverse driver
*Has the voltage come between terminal of CN101 "1" and "2" ?
2.Defective BTL driver (IC271)
*Has the motor drive voltage gone out to IC271"17" or "18"?
3.Has the control signal come from servo IC or the microcomputer?
*Is it "H" while the terminal of IC271"9"(STBY1) ?
*TRSDRV Is the signal input?
4.TRVSW is the signal input from microcomputer?

(4) Focus ON NG
* Is FE output ? --- Pattern, IC101
* Is FODRV signal sent ? (R279) --- Pattern, IC201
* Is driving voltage sent ?
IC271 "13", "14" --- If NG, pattern, driver, mechanical unit .
* Mechanical unit is defective.

(5) Tracking ON NG
* When the tracking loop cannot be drawn in, TE shape of waves does not settle.
* Mechanical unit is defective.
Because the self adjustment cannot be normally adjusted, the thing which cannot be normally
drawn in is thought.
* Periphery of driver (IC271)
Constant or IC it self is defective.
* Servo IC (IC201)
When improperly adjusted due to defective IC.

(6) Spindle CLV NG
* IC101 -- "35"(RF OUT), "30"(RF-), "31(RF+).
* Does not the input or the output of driver's spindle signal do the grip?
* Has the tracking been turned on?
* Spindle motor and driver is defective.
* Additionally, "IC101 and IC201" and "Mechanism is defective(jitter)", etc. are thought.

(7) Address read NG

* Besides, the undermentioned cause is thought though specific of the cause is difficult because various
factors are thought.
Mechanism is defective. (jitter)
IC201, IC301, IC401.
The disc is dirty or the wound has adhered.

(8) Between layers jump NG (double-layer disc only)
Mechanism defective
Defect of driver's IC(IC271)
Defect of servo control IC(IC201)

(9) Neither picture nor sound is output

1.It is not possible to search
*Has the tracking been turned on?
*To "(5) Tracking ON error" in "Check points for individual errors" when the tracking is not normal.
*Is the feed operation normal?
To "(3) traverse movement NG" in "Check points for individual errors" when it is not normal.
Are not there caught of the feeding mechanism etc?

How to upgrade the software – how to enter the service mode- Daewoo DLA37 LCD TV

Applicable to Daewoo DLA-32C7LAB, DLA-32C7LABD, DLA-37C7LAB, DLA-37C7LABD, DLA-42C7LAB, DLA-42C7LABD

Color Standard : NTCS, ATSC
Reception Channel : Ch 2~13 (VHF), Ch 14~69 (UHF), Ch 1, 14~125(Cable)
Sound Transmission System : FM Mono, 2 Carrier, Dolby Digital.

V Chip(Parental Control) SPEC
i) The rating doesn't work in PIP/POP mode. Reserves case is the same.
ii) The rating setting is possible only on the menu.
iii) Initial password : 2-2-1-1.
iv) Universal key cord (When user does not know password) : 5-4-2-2.

To enter SERVICE MODE.
A. Press “<VOL”> “MUTE”> “DISPLAY”> “MUTE” button of remote controller (R-55M15)
B. Press “S9” button of SERVICE REMOTE CONTROLLER.

BACK-LIGHT INVERTER CHECK.

Pin 14 is Status Output of Back light Inverter.

3.0V to 5.0V > Normal

0V to 0.7V > Abnormal

Software Upgrade procedure.

To upgrade PIC, remove(open) jumper of JP601. 

After upgrade completed, JP601 must be shorted with Jumper to normally operate the video board.

Run PICkit 2 Microcontroller Programmer

confirm if pickit 2 microcontroller programmer deteced device(PIC16F690) appropriately or not.

Importing HEX file for upgrade.

Write Click.

remove Pickit2 upgrade board when complte massage is come out.

Short JP601 with Jumper to normally operate the video board.

Flash Upgrade.

Installing CDM Driver.
• Download the latest available CDM drivers from the FTDI web site and unzip them to a location.
• Connect the device to a spare USB port on your PC.
Once the composite driver has been installed Windows Found New Hardware Wizard will launch.
The screen below is shown. 

Select “No, not this time” from the options available and then click “Next” to proceed with the installation.

Select “Install from a list or specific location (Advanced)” as shown below and then click “Next”.

Select “Search for the best driver in these locations” and enter the file path in the combo-box (ex.“E:£‹CDM 2.00.00”in the example below) or browse to it by clicking the browse button.
Once the file path has been entered in the box, click next to proceed.

The following screen will be displayed as Windows XP copies the required driver files.

Windows should then display a message indicating that the installation was successful.
Click Finish to complete the installation for the first port of the device.

The Found New Hardware Wizard will launch automatically to install the COM port emulation drivers.
As above, select “No, not this time” from the options and click “Next” to proceed with the installation.

Select “Install from a list or specific location (Advanced)” as shown below and then click “Next”.

Select “Search for the best driver in these locations” and enter the file path in the combo-box (ex.“E:£‹CDM 2.00.00”in the example below) or browse to it by clicking the browse button.
Once the file path has been entered in the box, click next to proceed.

Screen will be displayed as Windows XP copies the required driver files.

Windows should then display a message indicating that the installation was successful.
Click Finish to complete the installation for the first port of the device.

Open the Device Manager (located in “Control Panel£‹System” and then select the “Hardware” tab and click “Device Manger”) and select “View > Devices by Connection”, the device appears as a USB Serial Converter with an additional COM port with the label “USB Serial Port”.

Connect USB cable to the USB port of the computer.
• Connect the phone jack cable the service port of set.
• Run Flashupgrader.exe in the PC to excute the program.

Select current Upgrade file.
i) Click “Choose...”button to select the file you want to upgrade.
ii) Select the file (pwSDK.inf) that you want to upgrade.

Select correct COM Port and Baud Rate(115200) as shown below.
Then press Flash button to finish setup.

Turn on the power and then upgrade program will start the download.

When the upgrading is complete, a window (below) will be opened.
Press “Finish” button to complete the process.

LG Mini Hi-Fi system OM5540 330W – how to update the firmware, repair hints, schematic

How to update the firmware of LG OM5540 Mini hi-fi system, SMPS and main amplifier schematic, troubleshooting, ICs and connector voltages

Hidden key mode

Disc Lock On/Off (CD Function Only Active)
Front Key : STOP

RCU Key : STOP
 Check Version and Option codeFront Key : STOP

RCU Key : PLAY/PAUSEYou can change [Audio MCU Version <-> CD Controller Version <-> EEPROM Option] by SKIP+/-.
Clear EEPROMFront 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.
Bluetooth DUT

Front Key : STOP

RCU Key : PROGRAMBluetooth 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

PROGRAM DOWNLOAD & UPDATE

MICOM PROGRAM
Download program file name must be MICOM_OM5540_YYMMDDX.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.

MCS PROGRAM
Download program file name must be HG440_OM5540_YYMMDDX.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.

EQ PROGRAM
Download program file name must be EQ_PRG.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.

Troubleshooting

NO POWER
If the unit doesn’t work by no power problem, repair the set according to the following
(1) FUSE & BRIDGE DIODE
Please check and replace F901, BD901, TH901 or TH903 on SMPS board.
1) Check if the fuse F901 is open or short-circuit.
2) Check if the bridge diode BD901 is short-circuit by over current with a digital multi meter.
3) Check if the NTC thermistor TH901 or TH903 is normal or open.

(2) D951
Please check and replace D951 on SMPS board.
1) 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.

NO BOOTING WHEN POWER ON THE SET
The set doesn’t work when press the power button on the front board or the remote control.
(1) FLASH MEMORY
Please check and replace IC503 on MAIN board.
1) Check 5.6 V to CN501 in standby mode.
 If there is no 5.6 V, check the SMPS.
2) Check 12 V, F+, F- and PVDD when power on the set.
- If the set doesn’t work regardless of what the KEY1 changes high to low while pressing the power button.
X500 and X501 work normally but, if you can not power on the set, replace IC501 with a new one on the MAIN board.

VFD IS NOT DISPLAYED WHEN POWER ON THE SET
When power on the set, any icons or characters on VFD are not displayed.

Please check and replace DIG400 on FRONT board.
1) Check if VKK, FL+ and FL- are output from SMPS to VFD via the MAIN board.
2) Check if IC501 outputs VFD_D0, VFD_CLK and VFD_STB to the FRONT board.
3) Check the GR signal(pulse signal) of IC301 on the FRONT board.
Check the SG signal(pulse signal) of IC301 on the FRONT board.
 If the GR and SG signal isn’t output, replace IC301 with a new one.
 If the GR and SG signal is output, replace DIG302 with a new one.

NO SOUND
There is no sound output by DIGITAL AUDIO AMP DAMAGE

(1) BY DIGITAL AUDIO AMP DAMAGE (IN ALL FUNCTIONS)
Please check and replace IC700 on MAIN board.
1) Check PWM_FL± signals from IC601 to IC700 each input function.
 If no signal, check if I2S audio signals are entered to IC601.
2) Check the following I2S signal flow. < I2S audio signal Interface >
- MCS_BCK: IC501_Pin E1 --> IC601_Pin23
- MCS_LRCK : IC501_Pin D1 --> IC601_Pin22 (44.1 kHz)
- MCS_DATA_OUT : IC501_Pin E2 --> IC601_Pin24
- MCS_MCLK : IC501_Pin D2 --> IC201_Pin44
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.
3) Check PVDD.
 If PVDD is abnormal, check the SMPS.
4) Check +12 V for driving the gate of AMP IC.
a. All the powers are normal, but if +12 V is low, there is possible for AMP IC to be damaged.
b. Remove L702, L706 one by one.
When removed a inductance, if +12 V is recovered, the IC connected to it was damaged.
c. Replace the IC with a new one.
5) Check the impedance between IC700_OUT_A/OUT_D & GND.
a. If the impedance is 0 Ω, the IC must be damaged.
b. After removing the heat sink, replace it with a new one.

There is no sound output in the USB FUNCTION

 (2) IN THE USB FUNCTION
Please check and replace IC501 on MAIN board & IC460 on USB board.
1) Check +5 V_USB to USB board.
If the USB LED are turned on, the voltage is okay, if so not, check +5.6 V to pin3 of CN460.
2) Check USB D1± or USB D2± from MAIN board to USB board.
a. Check 2.0_D1± signals(pin U7, U8) or 1.1_D1± signals(pin A7, A8) to IC501on MAIN board.
b. Check USB± signals to CN421 (pin 2, 3, 5, 6).
If there is any trouble, check the power for each IC. The power is normal but , if the signal waveform to the IC is distorted or no signal, replace it with a new one.
3) Check if “Digital audio AMP block” on item 4-(1) is normal.

There is no sound output in the AUX FUNCTION
(3) IN THE AUX FUNCTION
Please check and replace IC201 on MAIN board.
1) Check AUX_L/R signals to IC201 (Pin23, 24).
2) Check if MCS_BCK, MCS_LRCK & MCS_MCLK are entered from IC501 to IC201.
3) Check if ADC_DATA is entered from IC201 to IC501.
Ö If no signal, check +5 V & +3.3 V(ADC) for IC201. If is NG, replace it a new one.
4) Check the following I2S signal flow from IC501 to IC601. (Refer to item 4-(1).)
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide on Item 4-(1).
 If AMP is damaged, replace it with a new one.

There is no sound output in the TUNER FUNCTION

 (4) IN THE TUNER FUNCTION
Please check and replace IC201, TU500 on MAIN board.
1) Check if TUNER_LR is entered from Pin1, 3 of TU500 to IC201(Pin26, 27).
 If no signals, check +3.3 V for tuner power.
 Check if the tuner control signals (CLK, DAT, CE, RST, SLT) are entered from IC501 to TU500.
If it doesn’t work, replace TUNER with a new one.
2) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC501 to IC201.
3) Check if ADC_DATA is entered from IC201 to IC501.
 If no signal, check +5 V & +3.3 V(ADC) for IC201. If is NG, replace it with a new one.
4) Check the following I2S audio signal flow from IC501 to IC601. (Refer to item 4-(1).)
 If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide on item 4-(1).
 If AMP is damaged, replace it with a new one.

There is no sound output in the PORTABLE FUNCTION

 (5) IN THE PORTABLE FUNCTION
Please check and replace IC201 on MAIN board.
1) Check PT_L/R signals to IC201 (Pin9, 10).
2) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC501 to IC201.
3) Check if ADC_DATA is entered from IC201 to IC501.
 If no signal, check +5 V & +3.3 V(ADC) for IC201. If NG, replace it a new one.
4) Check the following I2S signal flow from IC501 to IC601. (Refer to item 4-(1).)
 If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.
5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide on Item 4-(1).
 If AMP is damaged, replace it with a new one.

There is no sound output in the MIC FUNCTION

Please check and replace IC203 on MAIN board and IC420 on front MIC board.
[ How to troubleshoot (Countermeasure) ]
1) Check MIC_SIG signal, from JACK421, JACK422 to IC420 (Pin3) on front MIC board.
2) Check MIC_SIG signal from IC420 (Pin4) to CN423.
 If no signal, check +5 V for IC420. If NG, replace it a new one.
3) Check MIC_SIG signal from CN423 (Pin4) to CN420.
4) Check if MCS_BCK, MCS_LRCK, & MCS_MCLK are entered from IC501 to IC203.
5) Check if ADC_DATA is entered from IC203 to IC501.
 If no signal, check +5 V & +3.3 V(ADC) for IC203. If NG, replace it a new one.
6) Check the following I2S signal flow from IC501 to IC601.(Refer to item 4-(1).)
 If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.
7) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide on item 4-(1).
 If AMP is damaged, replace it with a new one.

SMPS schematic

Main amp schematic

Main DSP schematic

IC voltages and connectors

Vestel Power board IPS55 problems – Troubleshooting

17IPS55 board includes AC/DC a full bridge diode rectifier, a DC/DC low power

Flyback converter for stand-by voltage +5V and half-bridge resonant converter for +24V & +12V and two DC/DC Boost Converter stages having 24V input voltages. Total input power is 250W at 100Vac input voltage.

Power board has low power consumption for stand-by mode. 

The only voltage is supplied at stand-by condition is 5V.

For low power consumption in standby mode, +24V and +12V outputs is not activated. 

The only voltage in standby mode is 5V and allowed maximum current is 20mA in this condition.

CN8-INPUT.

Connectors and voltages

Problems and checks - DS is not working

DS is working but there is no backlight, DS is working but there is no sound.