HP WF1907 Service Manual page 12

4.2 Nothing display on screen screen is black, color of LED is blue
Is backlight light up?
OK
Does computer output RGB video signals?
(VGA or DVI)
OK
Check OSD menu is display on screen when
you push the "MENU" key.
OK
Proceed "Abnormal sreen" dection"
(
NG
Check the video cable for failure. Check the host for output signal with all
1) Change pattern of video signal output on the host.
NG
2) Reconnect the video cable.
3) Change the video cable. (VGA or DVI)
Check if the LCD module signal cable is connected between the I nterface
NG
Refer "Checking the backlight unit" section"
black only.
Board and LCD module.
OK
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Page 11
Failure Point
NG
The LVDS cable is disconnected.