Samsung BX2250 Service Manual page 28

4-4. When a blank screen is displayed (HDMI)
Symptom - Even though the LED power turns on, the screen is blank when connecting the HDMI cable.
- Even though the LED power turns on, the screen is blank when connecting the HDMI cable.
- Check the HDMI 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 Mainboard.
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 Mainboard.
Check the signal cables and
their connections.
Yes
① Is X401 oscillating correctly?
Yes
② Do the inputs appear at R171
to R176 and R241 to R246?
Yes
of CN400?
Yes
and 3 of CN400?
Yes
Check and replace the panel.
Check and replace the circuits
No
related to 401.
No
Check input part
Check the circuits related to
No
CN400
Check the Panel EN signal
No
and the BL_EN signal.
4. Troubleshooting
4-7