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3. Tips Of Some Typical Troubleshooting
White screen
First check voltage in HI-voltage Board; otherwise check the voltage of MAIN board ,
if abnormal , the problem occurs in 1U1or 1U2. If the voltage is OK, check the LVDS.
At last the connection between the main board and drive board may be the target for
troubleshooting.
Black screen
This problem often arise from the voltage input to the screen, so the first step is to
check the voltage of invert circuit. Otherwise check if the status is standby. If in TV
mode, check the power for tuner is correct.
No color
Check if the connection with the external device is correct. Otherwise make sure
the saturation is not zero. At last the problem may arise from the FLI8125.
Abnormal picture
Check if the range of the signal input to FLI8125 is correct. If no, the problem may
be in the AFE(Analog Front End). Otherwise make sure the color system is correct.
Then check the LVDS and the LCD Screen.
Pictures with no sound
Firstly, make sure the speakers works well. If so, the trouble mostly occurred in
TDA1517P in 9U1 in main board, then MSP3425G in 8U2.
Sounds with no picture
Check if any signal inputs to FLI8125, if yes, the problem may be in the AFE.
Otherwise check the LVDS.
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