When A Blank Screen Is Displayed (Hdmi) - Samsung P2370H Service Manual

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.
- Check the HDMI 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
Do output signals appear at pins 8 to 30
Caution Make sure to disconnect the power before working on the Adaptor.
4-10
CN601
X201
CN700
① Is X201 oscillating correctly?
Yes
② Do the RGB inputs appear at R134
to R140 of CN703?
Yes
of CN400?
Yes
Is DC 5V measured at pins 1, 2 and 3
of CN400?
Yes
Are IC101 inputs/ outputs and signals
correctly inputted and outputted?
Yes
Check and replace the Panel.
IC200
IC101
Yes
No
No
No
No
No
CN400
Check the signal cables and
their connections.
Check and replace the circuits
related to X201.
Check the R134 to 140 input
terminals.
Check the circuits related to
CN400.
Check the +5V_PANEL signal
and the BL_EN signal.
Check the circuits related to
IC101.