When The Screen Is Blank (Analog) - Samsung P2370H 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
Do output signals appear at pins 8 to 30
Caution Make sure to disconnect the power before working on the Adaptor.
4-4
IC602
IC601
CN700
① Is X201 oscillating correctly?
Yes
② Do the RGB inputs appear at R113,
R117 and R120 of CN102?
Yes
Do the ③ Hsync and ④ Vsync
waveforms appear at pins 32, 33 of
IC200, respectively?
Yes
of CN400?
Yes
Is DC 5V measured at pins 1, 2 and 3
of CN400?
Yes
Check and replace the panel.
Yes
Check the signal cables and
their connections.
Check and replace the circuits
No
Check the R113, R117 and
No
R120 input terminals.
Check the circuits related to
No
Check the circuits related to
No
No
Check the +5V_PANEL signal
and the BL_EN signal.
related to X201.
IC200.
CN400.