4-7
4. Troubleshooting
4-1-4. No Video (Tuner_CVBS)
Symptom Audio is normal but no picture is displayed on the screen.-
Major
checkpoints
Check the Tuner CVBS source
Check the MT8226
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
Check TU3001.
Change the main PCB assembly or tuner.
No
Yes
No
Yes
Power Indicator is off.
Lamp(Backlight) Off, no video
Yes
Check the RF source and
check the connection of RF cable?
No
Input the RF signal.
Check the connected cable.
Yes
Check IC5004
Change the main PCB assembly
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, Contact Tech support
No
Does the digital data appear at output
of RA5070~RA5075?
Does the digital data appear at output
of RA6074~RA6076, RA6078~RA6080,
R6082_P, R6083_P, R6086_P,
R6087_P?
No
Check IC6001_FBE
Change the main PCB assembly
8
6
7
Does the signal appear at TU3001?
Caution Make sure to disconnect the power before working on the SMPS / IP Board.
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