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Windows 7: Backlight not working on replacement LED Screen Toshiba Portege z835

29 Apr 2013   #1
kslip

Windows 7 Ultimate x64
 
 
Backlight not working on replacement LED Screen Toshiba Portege z835

I have a Toshiba Portege Z835 P330 ultrabook. I accidently broke the old screen and ordered a replacement from laptopscreen.com My original 14" screen was a samsung model. The one laptopscreen.com sent me was an LG. The First LG screen I received partially worked as in I could see graphics, but no backlight. I sent the screen back for an exchange, and they mailed me a replacement. Same problem: Graphics, but no backlight at all. I am perplexed. What could the issue be? I've quadruple checked the connection and restarted the laptop multiple times. It doesn't appear the video cable is damaged.

The Samsung model # of my original screen is LTN133AT25-T01
The LG Model # of the "compatible" replacement is LP133WH2

Any insight would be appreciated as im not looking forward to hashing it out with the laptopscreen.com tech anymore. Thanks


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30 Apr 2013   #2
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

There are two types of laptop LCD displays: older versions that use a separate fluorescent backlight bulb with an inverter, and newer models that use a true LED backlight integral with the display screen.
Do you know which type your laptop uses? Pure LED backlit screens with have only one ribbon cable to it. CCFL screens will have a second connection.
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01 May 2013   #3
kslip

Windows 7 Ultimate x64
 
 

1, This is an ultrabook. They all have LED screens. 2, I haven't seen a laptop with a fluorescent lcd screen in years, cmon. Thanks anyways.
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01 May 2013   #4
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Garbage in, garbage out dude. I go with what I have. You could have provided that little piece of information in your first post to be helpful.

It could be that the connection is not complete. What I have found is that you need to really push on that connector to get it to snap all the way into the socket. I always feel like I am going to break something, but it takes that much force.

It is highly unlikely you got 2 bad replacement screens. Therefore it seems more likely it is user error. Sorry.

You could insist on a Samsung replacement to see if it is indeed an incompatible replacement. Other than that you are left with the possibility that something else got broken.
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01 May 2013   #5
kslip

Windows 7 Ultimate x64
 
 

Hey I apologize for my tone, and I do appreciate the help. I did, however, state that my screen was LED in the title of my post.

I asked for an identical Samsung replacement, and the company doesn't stock them. Only LG's. The laptopscreen.com tech suggested that a fuse may be blown on my motherboard. Who knows. It is beyond me now, and I will probably end up spending money for a local computer repair shop to look at it.

Thanks
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01 May 2013   #6
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Yeah that may be a good idea. Although I've never seen a fuse (or breaker) for the display on a laptop motherboard. If there is one it is probably something that needs replacement. Beyond the capabilities of tinkerers like me.

The LG should work, the only compatibility issues with displays are size (and mounting) and socket. So if you got it plugged in correctly then what is left?

Ah! You put LED in the title. My bad. Who reads the titles?
Although I've lost count of the posters who think LCD and LED mean the same thing.
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01 May 2013   #7
kslip

Windows 7 Ultimate x64
 
 

Haha, Thanks TVeblen. I completely understand. It looks like you've helped many people on here, and you really have to start with the basic questions. It's hard to know the level of understanding or skill a person has, especially with a new member like me with few posts.

Yeah, everything seems right with the replacement LG screen. Drivers are up to date. Time to take it in to a shop I guess.
Thanks for the help & have a good day!
My System SpecsSystem Spec
20 Jun 2013   #8
jepil

Windows 7 64 bit
 
 
Toshiba z830 no backlight after screen replacement

I have just encountered this exact problem. I broke my z830 screen by accidentally wedging it in a car door . There was definitely no damage to the motherboard though so I figured a replacement screen would solve my problem. The old screen still lit up and the majority of it even worked as normal except for about an inch wide crack down the left hand side. After replacing the screen it worked perfectly but with no backlight. I thought it was just faulty so ordered another. 3 screens later I still can't get a backlight. After putting the old one back in, it also now has no backlight.

Did you end up finding a solution for this problem kslip or should I just go buy another one?
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20 Jun 2013   #9
kslip

Windows 7 Ultimate x64
 
 

No, unfortunately I am exactly where you are at. I am thinking I will have to pay someone an outrageous amount to get it fixed, and im low on cash so im just sitting on a useless ultrabook. I left it in storage, and now it wont even power on or charge. No status lights. Nothing. Good luck, please post back here if you figure anything out.
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20 Jun 2013   #10
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

I just discovered that there IS a fuse for the back light circuit on some motherboards.

It may be soldered onto the board, and if so, not an easy fix. A lot of these look like resistors. Many are marked F1 (on a Dell motherboard.)

If you have a local repair shop nearby you could probably get this done for "small" money ($75 US). If you are handy with a solder iron you could DIY. But it will require complete disassembly of the unit.

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Dim Laptop LED Screen – F1 or F8 Fuse just below the motherboard video connector | NWA PC Help


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 Backlight not working on replacement LED Screen Toshiba Portege z835




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