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4. Troubleshooting
4-3. When the screen is blank
Symptom
- Even though the LED power turns on, the screen is blank when connecting the VGA cable.
- Even though the LED power turns on, the screen is blank when connecting the VGA cable.
- Check the D-sub cable connections.
Major checkpoints
- 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.
Check the signal cables and
Diagnostics
① Is X202 oscillating correctly?
② Do the RGB inputs appear at R124,
Do the ③ Hsync and ④ Vsync
waveforms appear at pins 32, 33 of
Do output signals appear at pins 8 to 30
There are DC 5V at Pin 1,2 and 3 of
Check and replace the panel.
Caution
Make sure to disconnect the power before working on the IP board.
4-4
All manuals and user guides at all-guides.com
X202
Main Board Front
their connections.
Yes
Yes
R127, and R131?
Yes
IC202, respectively?
Yes
of CN202?
Yes
CN202?
Yes
CN202
IC202
No
Check and replace the circuits
related.
No
Check input part.
No
Check IC202 and related
Check CN202 and related
No
No
Check the +5V_Panel signal
and the BL_EN signal.
circuit.
circuit.
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