When A Blank Screen Is Displayed (Digital) - Samsung PX2370 Service Manual

4-4. When a blank screen is displayed (Digital)

Symptom - Even though the LED power turns on, the screen is blank when connecting the DVI cable.
- Check the DVI 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
1 Is X300 oscillating correctly?
2 Do input signals appear at R101
Do output signals appear at pins 8 to 30
Is DC 5V measured at pins 1, 2 and 3
Check and replace the Panel.
Caution Make sure to disconnect the power before working on the IP board.
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CN400
IC300
CN600
Yes
and R108 of CN101?
Yes
of CN400?
Yes
of CN400?
Yes
CN101
X300
CN601
Yes
Check the signal cables and
their connections.
No Check and replace the circuits
related to X300.
Check the R101 to 108 input
No
terminals.
Check the circuits related to
No
No Check the +5V_PANEL signal
and the BL_EN signal.
4. Troubleshooting
CN400.
4-7