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Hp laptop dark screen(no ccf backlighting)

I recently worked on a Hp laptop with no bakclighting. Everything is on the screen except you cant see them because the backlighting do not work. First I thought it was the circuit driver.Then came to findout it was part of the motherboard that controls the backlighting circuit. The customer told me the laptop was overheated because he had left it on a soft surface and the vent was blocked. I had replaced a few small components on the motherboard andgot it to work. They are extremely small so it would require jewelers magnifying glass or a microscope.

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My laptop screen is bright. Brightness control works but no picture. The picture is ok on external monitor. Sometimes a faint and incomplete picture appears on startup but disappears after a few seconds. Everything is ok except no picture on the laptop screen. Thanks

This might be a sign of a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp.

Aug 25, 2010 | Compaq Presario 700 470024-192 Notebook

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when I turn on my laptop there is a blank screen. Everything is workin except no picture.

try to connect an external monitor to the the vga to make sure everything works fine, if so you may have a defective backlight.

Mar 03, 2010 | Dell Inspiron 1200 Notebook

1 Answer

Laptop screen doesnt turn on

when you bootup all the way put a flashlight point it at the screen.
Do you see anything in the background?
Some people see shadows.
Basically it looks like the backlights do not work.
Sometimes inverters can go in which all you need to do is buy a new inverter and install it.
Let me know either way

Dec 23, 2008 | HP Pavilion dv9000z Notebook

1 Answer

no/very faint picture on screen

mslynn, you have either a bad backlight or backlight inverter board that changes DC to AC to light the backlight.
When the unit is taken apart you will be able to tell.

Feb 19, 2008 | Toshiba Satellite 1415-S173 Notebook

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