Hdmi No Screen - Samsung P2770HD Service Manual

4. Troubleshooting

4-5. HDMI No Screen

The LED power turns on but the screen is blank when the HDMI cable is connected.
-
Symptom
Check the HDMI cable connections.
-
Check whether the LVDS cable is connected correctly to the panel.
-
Major
checkpoints
Check whether the lamp connector of the panel is connected correctly to the IP board.
-
Check the circuit related HDMI input and scaler operation.
-
Diagnostics
Caution Make sure to disconnect the power before working on the IP board.
4-10
CN6009
Does led persists green light after
power on?
Yes
Dose proper 5V appear at pin No.
18 of CN6009?
Yes
Does proper signals appear at pin
No.15(SCL) ⑧
and No.16(SDA) ⑨ of CN6009?
Yes
Does proper clock signals appear
at pin NO.9 and NO.10 of D6005?
Yes
Does proper clock signals appear
at pin NO.11,12,23,24 of CN1005?
Yes
Check connection between main
board and panel.
Change Panel.
CN1005
Main Board Front
No
No
Check HDMI cable connection
No
No
No
because of scaler problem
Check IP board
Change IC6002
Change D6005
Change main board