Troubleshooting - YHi LT32C1M1 Service Manual

6.0 Troubleshooting Guide
System description
Item
1
Symptom
No Power, No Picture, No
Backlight, No Sound
No Picture, No backlight,
Sound is OK.
No Picture, Backlight is OK,
Sound is OK.
Action of Function Key
abnormally
Remote control problem
Poor performance of picture
No sound, Poor sound
Inspection points
1. Check Power board AC input.
2. Check Power board DC output (+SVs, +SV, +16V).
3. Check J4 of Main board and connecting wire.
4. Check J8 of Main board and connecting wire.
5. Check J6 of Main board and connecting wire.
6. Check Main board.
1. Check Power supply voltage for inverter.(24Vdc)
2. Check Inverter.
3. Check J6(main board) to Inverter connecting wire.
4. Check Main board.
1. CheckVLCD 5Von J9 connector.
2. Check Panel connector.
3. Check connecting wire( J9 to Panel).
4. Check Main board.
5. Check Panel
1. Check Keyboard
2. Check Key Pad.
3. Check Key board to CN1 connecting wire.
4. Check Main board.
1. Check IRboard.
2. Check IR board to CN5 connecting wire.
3. Check Remote control.
4. Check Main board.
1. Check AltFactory Reset.
2. Check Main board.
3. Check Video board.
4. Check CN2 of Video board connecting wire.
5. Check CN7 to Video board connecting wire. (For
Y,Pb,Pr)
1. Check Speaker.
2. Check JP7 to speaker connecting wire.
3. Check Main board.
4. Check Front RCAboard.
5. Check J3 to Front RCA board connecting wire.
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