Product specifications

4-4
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.
Major checkpoints
- Even though the LED power turns on, the screen is blank when connecting the VGA cable.
- 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
CN400
IC400
X400
Yes
Check the signal cables and
their connections.
Yes
No
Check the R204, R207, and
R211 input terminals.
No
Check the circuits related to
IC400.
No
Check the circuits related to
CN400.
Do output signals appear at pins 8 to 30
of CN400?
No
Is DC 5V measured at pins 1, 2, and 3
of the CN400?
Do the 3 Hsync and 4 Vsync
waveforms appear at pins 14, 15 of
IC400, respectively?
2 Do the RGB inputs appear at R204,
R207, and R211?
1 Is X400 oscillating correctly?
Check and replace the panel.
No
Check and replace the circuits
related to X400.
Yes
Yes
Yes
Check the +5V_Panel signal
and the BL_EN signal.
Yes
Caution Make sure to disconnect the power before working on the IP board.