When A Blank Screen Is Displayed (Digital) - Samsung T220 Service Manual

4-4. When a blank screen is displayed (Digital)

Symptom - Even though the LED power turns on, the screen is blank when connecting the DVI cable.
- Even though the LED power turns on, the screen is blank when connecting the DVI cable.
- Check the DVI 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
①
②
Diagnostics
Do output signals appear at pins 8 to 30
Can DC 5V be measured at pins 1, 2,
Caution Make sure to disconnect the power before working on the IP board.
CN 400
IC 200
R111, R114, R118
Check the signal cables and
their connections.
Yes
Is X201 oscillating correctly?
Yes
Do the inputs appear at R100,
R101, R103, and R107?
Yes
of CN400?
Yes
and 3 of CN400?
Yes
Check and replace the panel.
Check and replace the circuits
No
related to X201.
Check the R100, R101, R103,
No
and R107 input terminals.
No Check the circuits related to
CN400
No Check the Panel EN signal
and the BL_EN signal.
4. Troubleshooting
4-7