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laptop backlight replacement


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10 replies to this topic

#1 BoneFish

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Posted 10 August 2012 - 01:04 PM

I have an HP Pavilion ZE4900 with a bad backlight.
I have no real experience with computer repair other than the basics.
Is it worth the time and effort for me to give it a try.
Or should I just get a new laptop?

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#2 rotor123

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Posted 10 August 2012 - 04:51 PM

Hi
First you need to pin it down since a bad backlight and a bad inverter can both cause a dark screen. I also had a Lenovo where it was neither of those the cable from the laptop to the inverter and screen had went bad, Rare. Even more rare Motherboard circuit for the Inverter.

HP Pavilion ze4900 Notebook PC, HP Compaq nx9040, nx9030, nx9020 Notebook PC, Compaq Presario 2200 Notebook PC - Maintenance and Service Guide
Use this link

There are troubleshooting and parts replacement in the PDF I linked above.
A quick look shows Replacement screens at $79 US, less for a Inverter.

Does the screen light at all? Flicker?

I usually substitute to determine the problems source but I do keep some old still working screens around for the reason.

Good Luck
Roger

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#3 BoneFish

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Posted 10 August 2012 - 05:56 PM

Rotor,
Sorry I didn't mention I tried a new inverter.
When I installed the new one and powered up, the screen lit up but with a reddish tint.
Then it faded out so you can barely see it.
Thats why I figured it was the back light.
I saw a website where this guy explains how to replace the back light but he states it is a difficult task even for a computer tech.
My laptop is pretty old, doesn't even have an internal radio card for wi-fi but it works good.
Kinda wondered was it worth repairing a computer that old.
Thanks for the link. I'll read through it.

#4 rotor123

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Posted 10 August 2012 - 06:02 PM

Lighting up reddish and fading out sounds like the backlight is bad.

$80 + S&H more or less since I didn't look that hard for a new screen it could be cheaper put it into your decision since I've seen new cheapo laptops with a 15.6" screen selling in the low Three hundreds US dollars if you look for the sales.

That is a decision you need to make I'm afraid
Roger

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#5 BoneFish

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Posted 10 August 2012 - 06:15 PM

Your saying replace the screen instead of trying to replace the back light?

#6 rotor123

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Posted 11 August 2012 - 09:25 AM

I wouldn't try it again. I never did get satisfactory results changing the backlight. I also broke two or three of the bulbs trying.

To change the backlight you have to get the right fluorescent light bulb. Very thin and delicate, unsolder the wires off of the old one once you have taken apart the screen and solder the wires to the new bulb. Then put the screen back together.

I suggest reading this how to completely first and then decide. It can be done, it isn't easy unfortunately.

Generic How to replace laptop backlight lamp (CCFL)

Generalized Removing LCD screen from a Dell laptop.

Good Luck
Roger

Edited by rotor123, 11 August 2012 - 09:26 AM.

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#7 BoneFish

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Posted 16 December 2012 - 08:04 PM

Hard to believe I started this topic so long ago.
Well I shelved that laptop and just forgot about it for awhile.
Then I broke down and ordered a couple of backlights and tried to replace it.
The plastic frame and screw holes around the screen are shot and broken.
Finally got the screen out and backlight removed.
The replacement is not the right size, too long. Also backlight is too small and delicate for me to work with.
Should have listened to Rotor and bought a new lcd.
Now I'm going to order an lcd or I'm thinking about removing the laptop lid and picking up a small monitor and just turn it into a little desktop since my lid is so messed up.
Anyway a belated thanks for the help Rotor.

#8 rotor123

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Posted 16 December 2012 - 09:22 PM

The plastic frame and screw holes around the screen are shot and broken

I had some success with epoxy if all the pieces are present. Especially the brass parts that the screws thread into, but if everything is broken it might pay to look on ebay for replacement parts, they are not that badly priced. FWIW the problem you have is common on some models of Dell laptops.

Thanks for letting me know how it is going.

Roger

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#9 James Litten

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Posted 16 December 2012 - 11:49 PM

Hi BoneFish

There is a silver lining to this. Just about all other laptop repairs will be easy for you now :)
You'll think, "This is nothing compared to that darn backlight repair."

The other thing about backlight repairs is that even when it seems like you got everything done right, you'll notice an unevenness in the lighting. I have one that I did for a broken laptop that I got for free (was being thrown out) and I notice it every time I use it. If it was my main laptop or one that I repaired for a client, I would not be satisfied with it.

James

#10 rotor123

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Posted 17 December 2012 - 04:51 PM

Hi, James that was the result I got too. An uneven lighting. I guess they have a special jog to assemble the LCDs in the factory. The websites make it look easy too. But it isn't.

Cheers
Roger

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167 @ June 2015


#11 BoneFish

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Posted 17 December 2012 - 08:04 PM

I went to bestbuy and got a 65 dollar 20 inch monitor.
I have another old laptop with a screen that has the leaky green look on part of it.
I plan to use that computer to load linux and just play around with to try to learn something.
So anyway now I have a monitor I can use for both laptops.
Kind of defeats the purpose of having a laptop but I never take these two around anyway.
And Rotor the website does make it look easy.
I broke the connections off each end of the light just getting it out.
I would have never been able to get it back together.
It was almost a blessing getting the wrong back light because it saved me the trouble of trying to do the repair.




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