Samsung UN43TU8000F Chassis: UWK00-How to discharge the capacitors before repair, How to disassemble and power troubleshooting

 

Applicable to: Samsung LED TVs: UN43TU8000F, UN50TU8000F, UN55TU8000F, UN65TU8000F, UN75TU8000F, UN85TU8000F

Before Removing SMPS board, Discharge Capacitors
• 43 inches

You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.

• If LED ON > LED OFF discharge is completed.

Then verify voltage is less than 10Vdc across leads with Volt Meter.

Fig-50 inches
You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed. Then verify voltage is less than 10Vdc across leads with Volt Meter.

55 inches
You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
• If LED ON > LED OFF discharge is completed.

Then verify voltage is less than 10Vdc across leads with Volt Meter.

65 inches
You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed.

Then verify voltage is less than 10Vdc across leads with Volt Meter.

75 inches
You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed.

Then verify voltage is less than 10Vdc across leads with Volt Meter

85 inches
You have to discharge the SMPS by using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed

Then verify voltage is less than 10Vdc across leads with Volt Meter.

Disassembly

1. Push and hold down BLU connector tab to release it’s panel lock connection.

2. Lift to release the lock tab on upper left side of Board. (Step 4 will assist)

3. Locate a notch in insulation sheet. (not all models)

1. Push and hold down BLU connector tab to release it’s panel lock connection.

2. Lift to release the lock tab on upper left side of Board. (Step 4 will assist)

3. Locate a notch in insulation sheet. (not all models)

4. Use Open Jig in notch to help release & smoothly slide SMPS to the Right. (While pushing BLU Tab & Releasing Lock Tab)

Power Troubleshooting

 FUNCTION/IR Control Test

1. Place TV in Power Standby
2. Check LED Status
3. If LED is OFF
 Check LED 1.7Vdc (pin 14 ) and VCC for 5Vdc (pin 4 )
→ If missing suspect Function Assy/Cable/Main board.
4. If LED is ON
 Check Switch Operation activates on screen display.

If missing:
 Check KEY_INPUT1 (pin 11 ) change to 0V with a command.
• If wrong voltage or no change:
 Check Switch for stuck or miss-operation.
5. Check IR (pin 10 ) operation with Standard Remote command changes. (5V to 3.3V effective DC)
6. Check SDA (pin 17 ), SCL (pin 15 ) for effective 5Vdc (after power on)
→ If missing suspect Function Assy/Cable Assy/Main Assy.

FUNCTION/IR Control Test of Function/Wi-Fi /BT Module

1. Place TV in Power Standby
2. Check LED Status
3. If LED is OFF
Check LED (pin 17 ) and VCC for 5Vdc (pin 7 )
→ If missing suspect Function Assy/Cable/Main board.
4. If LED is ON
Check Switch Operation activates on screen display.

If missing:
Check KEY_INPUT1 (pin 11 ) change to 0V with a command.
• If wrong voltage or no change:
 Check Switch for stuck or miss-operation.
5. Check IR (pin 10 ) operation with Standard Remote command changes. (5V to 3.3V effective DC)
6. Check SDA (pin 14 ), SCL (pin 13 ) for effective 5Vdc (after power on)
→ If missing suspect Function Assy/Cable Assy/Main Assy.

Power supply board (SMPS) connector voltages. – 43 and 50 inches

55 and 65 inches

75 and 85 inches

Sanyo JCX2300K stereo receiver (Australia) – alignment-circuit diagram (Schematic)-STK-078 POWER IC

 

Alignment procedure

Schematic diagram – Tuner

Schematic diagram – power amplifier

Printed circuit board – Power amplifier and tuner

LG Woofer amplifier SMPS schematic EAX65142702, EAX4877702 and SMPS schematics EAX64464302, EAX65100001

 

Woofer SMPS circuit diagram – EAX65142702

Woofer SMPS circuit diagram – EAX4877702

SMPS circuit diagram – EAX64464302

SMPS circuit diagram – EAX65100001

Samsung LCD TV SMPS BN44 00422B, BN44 00497A, BN4400522B schematics

 

Samsung power board circuit diagrams

Sony Trinitron CRT TVs - KV14T1U, KV16WT1U, KV21T3U, KV2171U, KV14T1U, KV16WT1U, KV21T3U, KVM2171U – faults and checking points

 SONY Trinitron BE4 CHASSIS Faults, checking points and suspected components

SONY KV 14TE1 CHASSIS BE 4

Does not turn on, LED flashes 6 times.

Flash 6 corresponds to "Overvoltage / Over current Protection (Pin 52) high", on pin 52 of the processor it has 5V when it should have been 100mV, the protection circuit is armed. In this case, it was due to a short circuit in the line transformer.

Deviate the tuning voltage.  Remove the black plastic that is located between the pins and the metal housing of the TUNER.

SONY KV14ME1  BE-4A CHASSIS

Low sound and failure. 

Replace D408 (zener 6v8)

SONY KVM2171U  BE4A CHASSIS

No text, excessive width, poor gray scale.

NVM corruption. Replace IC002 new type ST24C02FB6 (875937032). Change C0255 from 47uF to 1000uF, add 5.6V zener from pin 8 IC002 (cathode) to earth, tighten earth spring around CRT in the shape of U.

Frame collapse. 

R622 (HT feed) o/c, R814 0.47R safety (frame feed) o/c.

SONY KV21T3U  BE4A CHASSIS

Volume goes to max, no remote or front control functions. 

Micro gets hot, replace Micro part no 875947506.

In the pic (blank video).

D722 (871999133) o/c on CRT.

Blank raster with flyback lines.

A1 voltage too high, replace LOPTx.

SONY KV16WT1U  BE4 CHASSIS

Frame collapse (no picture).

R814 0.46R 0.5W (121781111) o/c, IC501 TDA9302, C504 100uF 50V, also replace D501 RGP10GP (871930243) or may fail again.

Frame collapse.

DJ L807 wire link to LOPTx earth.

SONY KV14T1U

Dead.

LOPTr Q802 S2055N s/c, R615 0.46R (121737100) o/c, IC601 STRS5706 s/c.

Colour lines on top.

EEPROM IC002 ST24C02CB1 (875937032).

SONY KVM2171U  BE4A CHASSIS

No text, excessive width, poor gray scale.

NVM corruption. Replace IC002 new type ST24C02FB6 (875937032). Change C0255 from 47uF to 1000uF, add 5.6V zener from pin 8 IC002 (cathode) to earth, tighten earth spring around CRT in the shape of U.

Frame collapse.

R622 (HT feed) o/c, R814 0.47R safety (frame feed) o/c.

SONY KV21T3U. BE4A CHASSIS

Volume goes to max, no remote or front control functions. 

Micro gets hot, replace Micro part no 875947506.

In the pic (blank video).

D722 (871999133) o/c on CRT.

Blank raster with flyback lines.

A1 voltage too high, replace LOPTx.

SONY KV16WT1U.  BE4 CHASSIS

Frame collapse (no picture).

R814 0.46R 0.5W (121781111) o/c, IC501 TDA9302, C504 100uF 50V, also replace D501 RGP10GP (871930243) or may fail again.

Frame collapse.

DJ L807 wire link to LOPTx earth.

SONY KV14T1U. 

Dead.

LOPTr Q802 S2055N s/c, R615 0.46R (121737100) o/c, IC601 STRS5706 s/c.

Colour lines on top.

EEPROM IC002 ST24C02CB1 (875937032)

XOCECO LC42HK35 LCD TELEVISION – How to enter the service mode, software update, power board schematic

 

Panel 5203428504 V420H1-L11:  Remote control  6010Y05600  RC-Y56

Adjustments (MAIN BOARD 6HK0200110)

Connect all the boards according to wiring diagram, connect with power and observe the display.
Method for entering factory menu: press “INPUT”, “2”, “5”, ”8” and “0” in turn to enter factory menu; press “CH+” and “CH-” to select adjustment items and press “VOL+” and “VOL-” to adjust value items, press “MENU” continuously to exit.
Method for software upgrading: enter factory menu and select “OPTION”, set ISP to 1 or insert jump wire J201, then you can upgrade the software on line. After upgrade, it needs to set ISP back to 0 or pull out jump wire J201. when software upgrade finish,  turn off the TV and then turn on, enter the factory menu and initialize the EEPROM (EEPROM-MEMORAY RECALL).

Initialization
The items are only for some units which have special demands. They do not need to be adjusted for normal units.
Enter factory menu, select “OPTION” and “HOTEL OPTION” sub-menu.

Adjustment for AFT and AGC of IF channel in TV
3.2.1 IF AFT adjustment
Turn on the TV then enter the factory menu, set IF VCO to 1, disconnect J601, adjust L610 to value 2.5V of TP603 (A face), then wed J601.
3.2.2 IF AGC adjustment
Input 172.25MHz RF signal of 60dB to RF terminal, adjust RP601 to value 3.3V of TP601 (A face) and there should be no obvious snowy picture. Increase the TV signal to 90dBV and it should be no obvious noisy.
3.3 White balance adjustment
3.3.1 HDMI white balance adjustment
a. Input VG-848 signal to HDMI: TIMING854(800*600/60Hz) 8 level gray scale of PAT920, adjust the balance with CA210.
b. Enter COLOR TEMP sub menu and select color temperature of standard (1000K), the value of coordinate is commend.
c. Fixed B OFF, adjust R OFF, G OFF to let the color coordinate of the second level be (280,290) (CPT panel) and the brightness be 2-10nit or so; Fixed B GAIN, adjust R GAIN, G GAIN to let the color coordinate of the seventh level be (280,290) (CPT panel). Repeat adjust R OFF, G OFF, R GAIN and G GAIN, until the color coordinate of the two level gray scale be (280,290) (CPT panel).
3.3.2 VGA/YPbPr/ AV white balance check and correct a. Connect VG-848 signal of VGA to VGA terminal and input TIMING854(800*600/60HZ) PATTERN921(16 gray levels), enter ADC ADJ sub menu, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels), check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according the method of 3.2.2.
b. connect VG-848 YPbPr signal to YPbPr terminal and input TIMING972(1080I/60Hz) PAT908 color bar(include back/white bars), enter submenu of ADC ADJ, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels), check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according the method of 3.2.2
c. Input AV signal(PM5518, 8 gray levels, PAL for Chinese and NTSC for America) to VIDEO 1 terminal, check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according the method of 3.2.2.
Note: it can’t set back to 1 once ALL COLOR changes to 0.
4 Performance check
4.1 TV function
Enter searching menu → auto search, connect RF-TV terminal with central signal source and check if the picture is normal, if there are channels be skipped. Check CCD and V-CHIP for America.
4.2 AV/S, YPbPr terminals
Input AV/S, YPbPr / YCbCr HD signal, check if it is normal.
4.3 VGA terminal
Insert VGA terminal, input VGA format signal of 640X480@60 Hz and check if the display is normal.
4.4 HDMI terminal
Insert HDMI terminal, input 640X480@60Hz signal, check if the display is normal. Check HDCP function.
4.5 check sound channel
Check the speaker and earphone of each channel.
4.6 RS232 terminal
Insert the earphone wire to COM port, check the long-distance control function with special test software.
4.7 other function check
Check the turn on/turn off timer, asleep timer, picture/sound mode, OSD, freeze/mute, stereo/SAP, magic picture, ect.
4.8 presetting before ex-factory.

The RF signal received by antenna will be sent to tuner TUNER601, then IF signal will be obtained through high amplified, mixed frequency. After pre-intermediate amplified by V602, it will be sent to acoustic surface-wave Z602 to do IF filter and get better IF characteristics, then it will be sent to N602 (R2S40401) to do intermediate amplification, phase-lock loop VCO and synchronous wave detection to get the composite video signal TV-CVBS; after pre-intermediate amplification IF will also be sent to acoustic surface-wave Z601 to do filter at the same time, the it will be sent to N602 to do intermediate amplification and output the second sound intermediate frequency signal TV-SIF.
The TV-CVBS and TV-SIF signal will be sent to main IC N304 (MST9U89). Video signal of AV1, AV2, S-VIDEO, YPbPr1 and YPbPr2 will also be sent to MST9U89, their audio signal via audio switch N207 (HEF4052BT) selection to MST9U89 (AV1 and S-VIDEO share the same audio jacks).
HDMI1, HDMI2 and HDMI3 via HDMI switch N504 (TMDS351) selection, then sent to MST9U89 together with VGA.
The main IC N304(MST9U89) is a high performance and fully integrated IC, which can realize HDMI interface processing, video decoding, video switch selection, A/D and D/A conversion, interlace/de-interlace processing, modes conversion, OSD and low-voltage differential output, ect.  And it also has functions of audio selection, processing and MCU.
The video signal via MST9U89 processing, output 4 pairs differential signal and 1 pair clock signal for LCD panel display.
The audio signal via MST9U89 processing, it will be sent to N206 (BH3547F) amplifying to earphone. The audio signal will also sent to sound amplifier N203 (TPA3120) amplifying to speaker.

SMPS (POWER BOARD) – 6HU0422010 - Schematic

Funai LH7-M22BB 22″COLOR LCD TELEVISION-How make a service remote control, how to enter the service mode, service mode adjustments, schematic diagram

 

LH7-M22BB (A9372EP) model.
For the LH7-M22BB (A9372EP)model, the letter (A9372EP) is printed on the Serial Number Label on the back of the unit. Refer to the Serial Number Label on the right.

FUNAI COLOR LCD TELEVISION -  LH7-M22BB

How to initialize the LCD television:
1. Turn the power on.
2. To enter the service mode, press the service button on the service remote control unit.
- To cancel the service mode, Press [Power ] button onthe remote control unit.
3. Press the {i} button on the service remote control unit to initialize the LCD television.
4. "INITIALIZED" will appear in the upper right of the screen. "INITIALIZED" colour will change to green from red when initializing is complete.

How to make the Service remote control unit:
Cut “A” portion of the attached remote control unit as shown in Fig.

How to set up the service mode:
Service mode:
1. Use the service remote control unit.
2. Turn the power on.
3. Press the service button on the service remote control unit as shown in Fig.

Purity Check Mode

This mode cycles through full-screen displays of red, green, blue, and white to check for non-active pixels.
1. Enter the Service mode.
2. Each time pressing [7] button on the service remote control unit, the display changes as follows.

VCOM Adjustment.

1. Operate the unit for more than 20 minutes.
2. Set the color analyzer and bring the optical receptor to the centre on the LCD-Panel surface after zero point calibration as shown.
Note: The optical receptor must be set perpendicularly to the LCD Panel surface.
3. Enter the Service mode.
4. Press [3] button on the service remote control unit.
5. Press [P / ] buttons on the service remote control unit so that the colour analyzer value becomes minimum.

Auto Calibration [Component]
Purpose: To bring the colour adjustment of each component into standard alignment.
Symptom of Maladjustment: If this adjustment is incorrect, component signals do not reproduce the corresponding colour.
1. Input 720P 100% Colour Bar signal.
2. Enter the service mode.
3. To enter the Auto Calibration adjustment mode, press [6] button on the service remote control unit.
4. To start auto adjustment, press [P ] button on the service remote control unit.
- In the auto adjustment mode, “Calibration Check” appears on the screen.
- Upon completion, “OK” appears on the screen.

Auto Calibration [PC]
Purpose: To bring the colour adjustment of PC into standard alignment.
Symptom of Maladjustment: If this adjustment is incorrect, PC signals do not reproduce the corresponding colour.
1. Input SVGA 100% White signal.
2. Enter the service mode.
3. To enter the Auto Calibration adjustment mode, press [5] button on the service remote control unit.
4. To start auto adjustment, press [P ] button on the service remote control unit.
- In the auto adjustment mode, “Calibration Check” appears on the screen.
- Upon completion, “OK” appears on the screen.

The following adjustment normally is not attempted in the field. Only when replacing the LCD Panel then adjust as a preparation.

White Balance Adjustment
[Video/Component/PC]
Purpose: To mix red, green and blue beams correctly for pure white.
Symptom of Maladjustment: White becomes bluish or reddish.

1.Operate the unit for more than 20 minutes.
2. [VIDEO input]
Input the White Raster (70%=70IRE, 40%=40IRE).
[Component input]
Input the 720P White Raster (70%=70IRE, 40%=40IRE).
[PC input]
Input the SVGA White Raster (70%=70IRE, 40%=40IRE).

3. Set the colour analyzer to the CHROMA mode and bring the optical receptor to the centre on the LCD-Panel surface after zero point calibration as shown above.
Note: The optical receptor must be set perpendicularly to the LCD Panel surface.

Schematic diagram

For continued protection against fire hazard, replace only with the same type fuse.

Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.
If Main Fuse (F601) is blown , check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply.  Otherwise it may cause some components in the power supply circuit to fail

The voltage for parts in hot circuit is measured using hot GND as a common terminal.