When The Screen Is Blank (Analog) - Samsung T220 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.
X 201
② Do the RGB inputs appear at R111,
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 IP board.
4-4
CN 400
IC 200
R111, R114, R118
Check the signal cables and
their connections.
Yes
① Is X201 oscillating correctly?
Yes
R114, and R118?
Yes
Do the ③ Hsync and ④ Vsync
IC200, respectively?
Yes
of CN400?
Yes
of the CN400?
Yes
Check and replace the panel.
Check and replace the circuits
No
related to X201.
Check the R111, R114, and
No
R118 input terminals.
Check the circuits related to
No
Check the circuits related to
No
CN400.
No
Check the +5V_Panel signal
and the BL_EN signal.
IC200.