Samsung SyncMaster P2770HD, Service Manual

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4-8
4. Troubleshooting
4-4. DVI No Screen
Symptom
The LED power is on but no picture is displayed on the screen when the DVI cable is
-
connected.
Major
checkpoints
Check if the DVI cable has been connected.
-
Check if the LVDS cable has been properly connected to the LCD panel.
-
Check if the Inverter board has been connected properly to the lamp connector of the LCD
-
panel.
Diagnostics
Main Board Front
CN1005
CN901
Yes
No
Does led persists green light after
power on?
Check IP board
Yes
No
Dose proper 5V appear at pin No.
14 of CN901?
Check DVI cable connection
No
Does proper clock signals appear
at pin No. 2
and NO.4 of RA904?
Change RA904
Yes
No Does proper clock signals appear
at pin NO.11,12,23,24 of CN1005?
Change main board
because of scaler problem
Yes
Check connection between main
board and panel.
Change Panel.
Caution Make sure to disconnect the power before working on the IP board.