Question about Dell Inspiron 8500 Notebook

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LCD Display behaving badly

Hello, I found an insect had made a home inside my lcd screen which was really getting on my nerves. Since the warranty had already passed, I opened the display, unplugged it from the laptop and found that I could not get the insect out without taking the display apart far more than I felt comfortable doing. I plugged it back in, closed it up and resolved to live with the pest inhabiting my screen. The screen worked briefly thereafter and then stopped functioning properly. Each time I turn on the laptop is different. Sometimes I get a black screen (with or without a blinking cursor in the upper left),vertical multicolored lines, split screen half blue half white, and the windows load screen (slightly garbled). The furthest it will ever go is to a screen where its fuzzy blue and yellow pixels with a clear mouse pointer displaying. I have also tried getting it to work in safe mode with no success. Maybe the lcd cable just came loose but I'm worried that it might have something to do with the inverter, or even the graphics chip. Maybe there is a way to reset the lcd display to reinitialize itself when I power up? In any case, I now know better than to wish for an insect free lcd.

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Re: LCD Display behaving badly

It sounds like the ribbon connector or flexible connector is not seated quite right. I would open up the unit again and carefully inspect this or any other cable that you had unplugged.  Reseat these properly and power it up again.

These cables can be very easy to damage if not replaced properly. Take special care.


Posted on Oct 29, 2007

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An LCD screen cannot produce light. It needs an additional light source.

A Backlight is the additional light source.
A Backlight can be a CCFL, (Or two of them), or a series of LED's.
(Light Emitting Diode)

A CCFL is a Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

Average thickness of the bulb is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long as the LCD screen is in height.
(Yes. They have Mercury inside, just like their larger 'cousins')

A screen Inverter is used to convert the power from the laptop, for the LCD screen, and Backlight.

Laptops that use LED's for backlighting, do Not always use a screen Inverter.
It seems older laptops using LED's may, newer laptops using LED backlighting generally does not.

You need to diagnose.

The problem will be the;

A) Video Cable.
B) Inside the Display Assembly

Inside the Display Assembly:
Either the screen Inverter, IF used; or the LCD screen itself.

I don't believe it to be the graphics chipset, but this is a diagnostic flowchart we will be following, and there IS NO guessing. The graphics chipset is checked too.

Post in a Comment as to the laptop manufacturer name, and model number. The model number can be found on the bottom of the laptop.

This way if I have access to the Service Manual, I can post a link to it for you, and perhaps some pictorial guidance too.
Plus step by step guidance from me.


[May just be a loose connection of Video Cable TO motherboard, or back of LCD screen.
May be a damaged Video Cable.
May be a bad screen Inverter.
All these check out it is then a bad LCD screen ]

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Once the eeepc 900HD turns on, the screen looks like a palette of colors you'd see at Home Depot. I can hear the windows OS start up and takes me to the log in screen. I cannot proceed being that I am...

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Even though I suspect that there is a problem with

your system LCD too, but before you conclude, try

this out:

When you power on your system, use the function

key combination to try to activate the LCD screen by

pressing fn+f4 repeatedly, this will activate and

deactivate the LCD screen as you keep pressing it.

If after trying this nothing happens, then I'm afraid you

might need to replace your LCD screen...or just get

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Computer store and let an electrician fix it for you.

You should be ready to pay a few dollars though.

Also another option is if your Warranty is still active,

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Try this out and let me know how it goes.

Hope this helps you out.

Goodluck and thanks for using Fixya

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Either the lcd inverter or the lcd itself is bad. If the machine is under warranty then call HP to get it serviced otherwise

254108-001 is the part number for the lcd

Couldn't find the part number for the inverter board but I found one on Ebay here:

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Corporate Computer

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