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I have a Toshiba laptop which has a broken LED screen the screen was broken in transit, therefore you can assume that it was not handled with care. Whilst it was broken it still worked, therefore I purchased a replacement screen.
Now, I have changed a number of laptop screens but never an LED one and noticed that it did not have an inverter but had circuitry taped onto the rear of the monitor which acts as a backlight, therefore only one connector. Great, I swapped over to the new screen powered up, nothing, I swapped it back onto the old screen, still nothing. I did this half a dozen times.
My first thought was that somehow I have knackered both the screens, therefore I took another laptop which had the same screen (Samsung) and connected both the damaged screen and the new one, they both worked perfectly.
Therefore there is something wrong with the Toshiba itself, now could it be coincidence and that the video cable has become dislodged? I doubt it as it was working before I started, could the video card be damaged?
Do you have any suggestions as to what could cause this? I am happy to take the laptop apart if needed, but what should I test?
One other thing, after I had changed the screen the first time and had connected it to an external monitor, I turned the laptop on and the charge indicator stated 85% plugged in not charging which i thought was strange, I decided to remove the power cable and the laptop immediately died as if there was no battery attached, just like pulling the plug on a desktop. I did this twice!, I then removed and replaced the battery re powered and everything was fine 85% plugged in and charging, removed the power cable and the laptop continued to work on battery power.
What may have caused this to happen? Could this be anything to do with the screens not working? Note that the screens were not working before this happened, but could something prior to this when I first connected the battery after changing the screens caused the malfunction of the screens.
Any help or advice would be greatly appreciated
Rich
Posted 2012-05-24T20:13:49.320
Reputation: 21
Thank you i will do that and let you know how i get on. The video cable itself will be difficult to check as the pin outs are tiny, but i will do my best, thanks again. – Rich – 2012-05-24T20:50:48.160
@Rich Yes, they are small.. but what you need to look for is damage to the cable itself. unlikely as it may be, the cable may have been pinched at the hinge when it was dropped by the transit company. The motherboard connection itself is more a matter of you disconnecting it, and then reconnecting it firmly. It could have been unseated partially by the impact. – Bon Gart – 2012-05-24T20:54:23.910
The thing i should have mentioned, prior to posting was that the laptop had been working fine albeit with a cracked screen, the screen only stopped working after i had changed it, hence me thinking that it may be the cable at the screen end rather than the MB end. Either way i shall take it apart and my Samsung and swap the cables over to test and let you know how i get on. Thanks again. – Rich – 2012-05-25T14:59:15.197
@Rich be forewarned, the cable from the other laptop may not fit at the motherboard end. They aren't universal to all laptops. – Bon Gart – 2012-05-25T16:29:53.443
Arhhh, that thought had crossed my mind, which means i need to figure out the connectors for both motherboards which is difficult as most system manufactures do not make it common knowledge as to which motherboard model is used. – Rich – 2012-05-26T08:49:05.800
I opened up the laptop to find that the video cable was very secure in two places and therefore not a bad connection. I decided to power on the laptop and gently fiddle with the lead as the lead came loose almost to the point of disconnecting (screen end) the laptop powered off just like before, bang , start in safe mode almost as if a short had shut the power down. I sort of don't want to do that again just in case it shorts a blows something. Just thought I'd let u know. – Rich – 2012-05-28T11:18:11.427
I swapped the video cable with one from another laptop both for 15.6" LED screens as suspected whilst the connectors were identical the pin outs were different. When i connected the donor lead to the laptop, it would not even power up. I have taken the plunge and bought a replacement lead, fingers crossed. – Rich – 2012-05-28T11:23:24.570
It certainly sounds like the cable is damaged at the screen end. – Bon Gart – 2012-05-28T15:46:01.617
It certainly sounds like the cable is damaged at the screen end. – Bon Gart 4 hours ago
Let's hope so! – Rich – 2012-05-28T19:55:27.697
Just a quick update and to see whether anyone else has any other ideas, i purchased a new cable using the same part number, low and behold the PIN out was different. I therefore removed an identical known working cable from another C660 with the same PIN out and this too did not work, therefore it is not a problem with the cable. I can only assume therefore that the connector at the MB end is shorting out somehow. This is probably an item that would be difficult to test let alone replace. – Rich – 2012-06-10T12:18:01.807