4-3
4. Troubleshooting
4-3. No Video (Analog)
Symptom -Though the LED power turns on, the screen is blank when connecting the VGA cable.
Major
checkpoints
- Check the D-sub cable connections.
- Check whether the LVDS cable is connected correctly to the panel.
- Check whether the lamp connector of the panel is connected correctly to the IP board.
Diagnostics
Yes
1
Check signal cable connection
and power.
Yes
Replace or check related
circuit.
No
X1 oscillate proprely?
Is there R,G,B input at
R111,R114 and R118?
Check input part.
No
Yes
Is there Hsync, Vsync waveform at Pin
32,33 of IC200?
Check IC200 and related
circuit.
No
Yes
Does the output signal appear
at Pin 17~20, 22~27 of CN400?
Check CN400 and related
circuit.
No
2
Yes
There are DC 5V at Pin 1,
2 and 3 of CN400?
No
Check PANEL_EN SIGNAL
at R223 is High(On:High) and
BL_EN signal at R601(ON:
Low) is Low
3
Yes
Replace LCD Panel.
Caution Make sure to disconnect the power before working on the IP board.
Main Board Front
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