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

20 Jun 2013   #11
jepil

Windows 7 64 bit
 
 

I also read about fuses for the back light on spme laptops TVeblen. I have another z830 that I ran over previously that is already in bits (long story....) so I had a look at that where it all hooks up to the m/b. I couldn't see anything marked f1 for a fuse. Of course there still might be a fuse that is just marked differently. I will definitely take it down to a repair shop to at least get it looked at kslip so I will let you know how it goes. If they quote me more than $200 chances are I will just have a very expensive media player for the lounge room since it works fine through HDMI.

Thanks for the replies.


My System SpecsSystem Spec
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20 Jun 2013   #12
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Take a look at the link in my previous post. There are a few pics of various motherboards and their fuse locations.
Bottom line: without a circuit schematic it is not a DIY job.
My System SpecsSystem Spec
30 Jun 2013   #13
jepil

Windows 7 64 bit
 
 

Just a quick update. I took both my screens to the place I bought the new screen from and they both worked ok (except for the massive crack in the old one). This means that something must have happened to the motherboard when replacing the screen. I also replaced the screen cable, but no change. I rang toshiba service and they mentioned that even with power off the screen can short out the motherboard, the battery should be completely removed before changing. This is a mission in itself for this model given that it is built in.... I have seen you tube clips where the screen has been replced without removing the battery, so maybe we just got unlucky kslip
I got a price of about $560 to replace the motherboard, so I am not sure if I will get it repaired yet but that seems to be the only solution the tech had.
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01 Jul 2013   #14
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Do you have a small computer repair shop near you? You may be able to get the motherboard repaired (if it has that breaker) for much less than that.

Otherwise it probably makes more sense to put that $560 towards a new laptop. The difference between that and the cost of a new one can be chalked up to tuition for the school of hard knocks.
My System SpecsSystem Spec
03 Sep 2013   #15
Richard S

windows 7
 
 

Did anyone figure this out?

I have the same problem with a Toshiba Z835-330. Bent the screen so that a portion of it was not working but the rest was, put in a replacement and when I got done no picture. I put the old screen back in and no picture on that either. I can connect the laptop to a monitor and everything works fine if I use the monitor.

I followed the directions on a video posted on one of the laptop screen replacement sites. They showed someone using a small screwdriver to carefully pry the screen connector apart. Even though my laptop was not plugged in, I noticed a small spark/flash when I touched the connector with a screwdriver to gently pry it apart.

I called toshiba and they want $120 just to look at it. Their website says a new motherboard is $400 and a new screen is $400, so if both are required, no sense in repairing the laptop.

Any help?
My System SpecsSystem Spec
03 Sep 2013   #16
Richard S

windows 7
 
 

I wonder if the screen replacement would have gone ok if I had not used something metal to pry the connector apart. If so, I wish the company who had the self help video on their website would have included that little tid-bit in the video!
My System SpecsSystem Spec
03 Sep 2013   #17
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

There should be no power to the laptop when doing ANY work inside it.
Did you remove the battery Also?
My System SpecsSystem Spec
02 Nov 2013   #18
bryce42082

Illinois
 
 
toshiba z835 / 830 no backlight SOLVED!!!!

deleted
My System SpecsSystem Spec
03 Nov 2013   #19
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

That is a good workaround. But I need to mention for anyone else looking here that these circuit breakers are there for a reason: to protect the rest of the motherboard from damage. If you do this workaround and the same power surge occurs that burnt out the breaker in the first place then you could fry all or part of the motherboard.
As bryce42082 says: try this at your own risk.

Bryce: so when you plug the power supply/charger into the laptop while it is running (on the desktop) it just immediately turns off? What is blinking? The power light on the laptop, or something on the display?
My System SpecsSystem Spec
05 Mar 2014   #20
smmartin

Windows 8 64
 
 

I have just experienced this problem, would anyone here be able to tell me what the quick fix was? Thanks guys!
My System SpecsSystem Spec
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 Backlight not working on replacement LED Screen Toshiba Portege z835




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