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TROUBLESHOOTING
General Features
No. Symptom
Cause
1
Soft touch doesn't
Defective speaker wire
function properly
and inverter wire
2
Soft touch doesn't
1) Broken components and
function
soldering of them
2) P401 connector error
3
No screen
Input error of inverter connector 1) Bend the pin legs of P801 connector -> recheck them
P502 and Pin 21 connector
being slipped out
Cracked components and
soldering at tuner board
4
Dark screen
1) Defective LCD lamp
2) Defective inverter
5
Broken OSD display Defective the font rom of IC505
PC Mode
No. Symptom
6
Screen noise
7
Screen position error
8
Color beat noise
TV and external input
No. Symptom
9
No sound
- Speaker
- Earphone
10
Video color beat noise
Check Point
1) Make some space between the speaker wire and
the Soft touch Board by sticking the speaker wire
to the guide hole of the cabinet.
2) Arrange working state of A1. Tape in the inverter wire
and correct working state of the Shield case.
1) Check Soft touch with eyes
2) Check and repair the P401 connector
2) Check and repair the IC801, IC802 SI4925
1) Check and fix P502 connector
2) Check and fix the components at P502 LCD module
1) Check and repair tuner board and main board
2) Solder Q301, Q302, Q402, Q403, Q801 and R802.
1) Replace the inverter
2) Replace the LCD lamp
Replace the font rom of IC505
Cause
Clock or phase being
not able to be adjusted
Screen position error
horizontally or vertically
Soldering AD converter
or making it short
Cause
Defective Reset IC of IC603
Defective MSP3440 of IC601
Earphone shield case being
touched
Soldering IC301 and IC501
Check and repair soldering
and at main board.
Check Point
1) Resetting is needed according to the video card of each
PC
2) Adjust auto configure operation.
Adjust horizontal and vertical position until the screen
displays normally
Recheck and repair AD9884
Check Point
1) Check volume and speaker
- Sound comes out only when being inputted into
Audio L/R
2) Check after replacing IC603
3) Replace IC601
Check the mould of shield and J403, Replace shield
case
Re-soldering
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