Pavilion DV4 backlight on but no picture

October 31, 2011 at 23:34:48
Specs: Vista 64 Home Premium, Socket 1156
Hi guys,

I'm working on the above laptop for someone and the backlight comes on but no picture. Customer said it use to come on once in a while after a few starts but now its just the backlight, no bios or windows logo or anything.

Works fine on external monitor. I tried reseating the cable on the lcd to no avail. I assume the power inverter works since the ccfl bulb is turning on. I ONCE got the windows logo to show up after starting it with the lid off and an external monitor. I then opened the screen and it came on but I could not reproduce that.

I'm waiting for a new LCD cable to come in but told the customer that might not work and it may be the monitor itself.

Any IDEAS!?


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#1
November 1, 2011 at 04:28:49
Yes inverter is working ok.
I think the screen is bad, use another screen to see if u can see the image.

You know the real meaning of peace only if you have been through the war.


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#2
November 1, 2011 at 11:16:49
You know, I tried a spare lcd screen I had and was able to see the hp logo for a second but it disappeared since I believe this screen has a bad ccfl bulb.

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#3
November 1, 2011 at 11:45:51
I don't think the bulb is bad.
U can see the image on the screen even if the bulb or inverter is bad. If u see the backlight on the screen then the inverter and bulb are ok.
Are u sure the system is posting?

You know the real meaning of peace only if you have been through the war.


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#4
November 1, 2011 at 13:58:06
The system is not only posting, it is starting all the way up and I can tell that by hooking up an external monitor.

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