4-9
4. Troubleshooting
4-1-5. No Video (Video CVBS)
Symptom Audio is normal but no picture is displayed on the screen.-
Major
checkpoints
Check the Video CVBS source
Check the MT8226
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
No
Check JA3019_NT or Side-AV
Change the main PCB ass’y or
Side-AV Ass’y
Power Indicator is off.
Lamp(Backlight) Off, no video
No
Check the video source and
check the connection of
video cable?
Check IC5004
Change the main PCB assembly
No
Does the signal appear at R3115_NT,
R3152_NT, R3208_NSIDE ~
R3211_NSIDE?
Does the digital data appear at output
of RA5070~RA5075?
Check IC6001_FBE
Change the main PCB assembly
No
Does the digital data appear at output
of RA6074~RA6076, RA6078~RA6080,
R6082_P, R6083_P, R6086_P,
R6087_P?
No
Please, Contact Tech support
Check the LVDS cable?
Replace the LCD panel?
Yes
Yes
Input a video signal.
Check the connected cable.
Yes
6
6
Yes
7
Yes
Caution Make sure to disconnect the power before working on the SMPS / IP Board.
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