When The Screen Is Blank (Analog) - Samsung PX2370 Service Manual

4. Troubleshooting

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

- Even though the LED power turns on, the screen is blank when connecting the DVI-I to D-sub
Symptom
cable.
- Check the DVI-I to D-sub cable connections.
Major checkpoints - Check whether the LVDS(FFC) cable is connected correctly to the panel.
- Check whether the lamp connector of the panel is connected correctly to the Inverter.
Diagnostics
Caution Make sure to disconnect the power before working on the IP board.
4-4
CN400
1 Is X300 oscillating correctly?
Yes
2 Do the RGB inputs appear at R119,
R122 and R124 of CN101?
Yes
Do the 3 Hsync and 4 Vsync
waveforms appear at pins 66, 67 of
IC300, respectively?
Yes
Do output signals appear at pins 8 to 30
of CN400?
Yes
Is DC 5V measured at pins 1, 2 and 3
of CN400?
Yes
Check and replace the panel.
IC300
X300
CN601
CN600
Yes
No
No
No
No
No
CN101
Check the signal cables and
their connections.
Check and replace the circuits
related to X300.
Check the R119, R122 and
R124 input terminals.
Check the circuits related to
IC200.
Check the circuits related to
CN400.
Check the +5V_PANEL signal
and the BL_EN signal.