When The Screen Is Blank - Samsung E2320 Service Manual

4. Troubleshooting
4-3. When the screen is blank (Analog)
Symptom - LEven though the LED power turns on, the screen is blank when connecting the VGA cable.
- Even though the LED power turns on, the screen is blank when connecting the VGA cable.
- Check the D-sub cable connections.
Major checkpoints
- Check whether the LVDS cable is connected correctly to the panel.
- Check whether the lamp connector of the panel is connected correctly to the IP board.
Diagnostics
Caution Make sure to disconnect the power before working on the IP board.
4-4
Check the signal cables and
their connections.
Yes
① Is X401 oscillating correctly?
Yes
② Do the RGB inputs appear at R206,
R210, and R213?
Yes
Do the ③ Hsync and ④ Vsync
waveforms appear at pins 32, 33 of
IC400, 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 the CN400?
Yes
Check and replace the panel.
IC400
X401
R206,R210,R213
No
No
No
No
No
CN400
Check and replace the circuits
related to X401.
Check the R206, R210, and
R213 input terminals.
Check the circuits related to
IC400.
Check the circuits related to
CN400.
Check the +5V_Panel signal
and the BL_EN signal.