When The Screen Is Blank (Analog) - Samsung P2250(G) Service Manual

4. Troubleshooting

4-3. When the screen is blank (Analog)

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.
2 Do the RGB inputs appear at R111,
Diagnostics
waveforms appear at pins 32, 33 of
Do output signals appear at pins 8 to 30
Is DC 5V measured at pins 1, 2, and 3
Caution Make sure to disconnect the power before working on the IP board.
4-4
Check the signal cables and
their connections.
Yes
1 Is X201 oscillating correctly?
Yes
R114, and R118?
Yes
Do the 3 Hsync and 4 Vsync
IC200, respectively?
Yes
of CN400?
Yes
of the CN400?
Yes
Check and replace the panel.
CN400
X201
IC200
R100,R101,R103
Check and replace the circuits
No
No Check the R111, R114, and
Check the circuits related to
No
Check the circuits related to
No
No
Check the +5V_Panel signal
related to X201.
R118 input terminals.
IC200.
CN400.
and the BL_EN signal.