Samsung PX2370 - When a Blank Screen Is Displayed (HDMI)

4-10
4. Troubleshooting
4-5. When a blank screen is displayed (HDMI)
Symptom - Even though the LED power turns on, the screen is blank when connecting the HDMI cable.
Major checkpoints
- Check the HDMI cable connections.
- 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
CN400
CN600
CN601
CN102
IC300
X300
Yes
Check and replace the circuits
related to X300.
No
1 Is X300 oscillating correctly?
2 Do input signals appear at R171
and R178 of CN102?
Check the R171 to 178 input
terminals.
No
Yes
Do output signals appear at pins 8 to 30
of CN400?
Check the circuits related to
CN400.
No
Yes
Is DC 5V measured at pins 1, 2 and 3
of CN400?
Check the +5V_PANEL signal
and the BL_EN signal.
No
Yes
Check the signal cables and
their connections.
Yes
Check and replace the Panel.
Caution Make sure to disconnect the power before working on the IP board.