4-5
4. Troubleshooting
4-1-3. No Video (HDMI 1, 2, 3, 4 - Digital Signal)
Symptom Audio is normal but no picture is displayed on the screen.-
Major
checkpoints
Check the HDMI source
Check the MST336CCLK, Check the Bayhill+
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
Check CN402, CN403, CN404, CN503,
HDMI cable.
Change the HDMI cable. Change
the main PCB assembly
No
Yes
Does the digital data appear
at output of RA1605~1610, R1607?
No
Yes
Power Indicator is off.
Lamp(Backlight) Off, no video
Yes
Check the HDMI source and check
the connection of HDMI cable?
No
Input an HDMI signal.
Check the connected cable.
Yes
Check IC1301
Change the main PCB assembly
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, Contact Tech support
No
Does the signal appear at
R440~R447(HDMI1)
R448~R455(HDMI2)
R456~R463(HDMI3)
R553~R560(HDMI4)?
Does the digital data appear at output
of R1308 ~R1321, R1323~R1336?
No
Check IC1001
Change the main PCB assembly
3
4
5
Caution Make sure to disconnect the power before working on the IP board.
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