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 SEMT01(MT8226)
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
2
3
1
No
Check a B+ voltage (#3 of Tuner) 5V,
change a main PCB ass’y.
No
No
Power Indicator is off.
Lamp on, no picure.
Yes
Check a TU3101
Change a main PCB ass’y.
Does the signal appear at C1351?
[4] Does the signal appear at
pin 9 of TU3101?
Does the digital data appear at the
output of LVDS (RA5104~RA5109)?
No
Please, Contact Tech support.
Check the LVDS cable?
Replace the LCD panel?
Yes
Connect the RF cable and
check RF signal.
Yes
1
2
3
Yes
No
Check a IC5105
Change a main PCB ass’y
Caution Make sure to disconnect the power before working on the IP board.
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