When The Screen Is Blank (Analog) - Samsung BX2250 Service Manual

4. Troubleshooting
4-3. When the screen is blank (Analog)
Symptom - 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 Main board.
② Do the RGB inputs appear at R106,
Diagnostics
waveforms appear at pins 32, 33 of
Do output signals appear at pins 8 to 30
Is DC 5V measured at pins 1, 2, and 3
Caution Make sure to disconnect the power before working on the Main board.
4-4
Check the signal cables and
their connections.
Yes
① Is X401 oscillating correctly?
Yes
R110, and R113?
Yes
Do the ③ Hsync and
Vsync
IC400, respectively?
Yes
of CN400?
Yes
of the CN400?
Yes
Check and replace the panel.
Check and replace the circuits
No
related to X401.
No
Check input part
Check the circuits related to
No
Check the circuits related to
No
CN400.
No
Check the +5V_Panel signal
and the BL_EN signal.
IC400.