Samsung B1930HD - DVI;HDMI no Screen

4-8
4. Troubleshooting
4-4. DVI/HDMI No Screen
Symptom
The LED power turns on but the screen is blank when the HDMI cable is connected. -
Major
checkpoints
Check the HDMI cable connections. -
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. -
Check the circuit related HDMI input and scaler operation. -
Diagnostics
Main Board Front
CN1003
CN1002
CN1403(HD)
CN1404(Full HD)
Yes
No
Does led persists green light after
power on?
Check IP board
Yes
No
Dose proper 5V appear at pin No.
18 of CN1002 or CN1003?
Check HDMI cable connection
Yes
No
Does proper signals appear at pin
No.15(SCL) ⑧ and No.16(SDA) ⑨
of CN1002 or CN1003?
Change IC14001 or IC14002.
No
Does proper clock signals appear
at pin NO.9 and NO.10 of D6005?
Change D6005
Yes
No
Does proper clock signals appear
at pin NO.11,12,23,24 of CN1404?
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.