Toshiba LED Backlight problem

[leeno382]

Hi Guys
I have made an mistake whilst changing the Led Screen ive left the battery in whilst unplugging and plugging the new screen in, this has now caused the backlight to go, I can see the dark icons but the screen light wont work.

The backlight was working fine before hand, the new screens have been tested and both are ok, I cannot find the Schematic or the fuse for this backlight on the board model, here is the Model if anyone can please help me out, much appreciated thank you

Toshiba C50D-A-146
Motherboard model: PT10AN-DSC
Rev 2.1

[leeno382]

Re: Toshiba LED Backlight problem

I've managed to find a burnt area directly underneath the Led connector, I am thinking of just bridging this, I suspect it to be a fuse? Anyone tell from the pics what this is please? Thank you

Looks like pictures didn't upload properly here they are again, Pic 1 is the only (Burnt) component I can find

Pic 2 is the plastics directly underneath where this component lies (Burnt plastic residue) I think

[ReeceyBurger123]

Re: Toshiba LED Backlight problem

What pictures ? Sounds like you probably shorted something out and the board needs a very minor repair.

[leeno382]

Re: Toshiba LED Backlight problem

Sorry looks like they didn't upload here they are again :-)

[dj_ricoh]

Re: Toshiba LED Backlight problem

alright!

use IPA and clean the whole zone.

scrape everything down that is ash and try to see where it goes.

use your DMM to trace down where it goes and where it comes from.

i will say that is a Coil and if it had any marking it will be with L. 95%

but it can be a cap but its to dark and can`t see really good in that picture.

i don`t think a cap will blow in that spot because it needs a lot of amps if its a 10uF cap SMD 2.4v

so my money its with the COIL.

beware!!! it may be shorted to ground and if you bridge it it may blow something MORE important.

take it down. power up and see how much voltage you got there. inject the same amount of voltage on the other side(pin).
if it powers up then you can bridge it.

maybe its just a fuse and i miss the boat when they started making them bigger and blacker

have fun!

[leeno382]

Re: Toshiba LED Backlight problem

Thank you for your time, are you saying take it off as it looks cooked anyway? is there anything I can put on whilst its powered up to see if the led lights up or not? I don't know much about this side of things as you can gather :-)

[dj_ricoh]

Re: Toshiba LED Backlight problem

Like I said in the previous post.
Check how much voltage you got on the pad after you take it of then inject voltage and see if it powers up

[leeno382]

Re: Toshiba LED Backlight problem

Thank you,

Ive just brushed the area with a toothbrush and the component is already loose, its not making contact I have now just removed this i'll check voltage now

[leeno382]

Re: Toshiba LED Backlight problem

Just managed to fix it, just knocked off the component give it a clean and bridged it with solder, hey presto backlight fully functional... thanks for your help

[dj_ricoh]

Re: Toshiba LED Backlight problem

o well!

nice fix

i just wanted to explain how it works if you got no schematic and no way of finding out whats there.

Good job!

next time you do that with the solder blop there i`m sure it will blow up the the 3.v/5v regulator or KBC :P

been there

[ReeceyBurger123]

Re: Toshiba LED Backlight problem

Nice one

[leeno382]

Re: Toshiba LED Backlight problem

o well!

nice fix

i just wanted to explain how it works if you got no schematic and no way of finding out whats there.

Good job!

next time you do that with the solder blop there i`m sure it will blow up the the 3.v/5v regulator or KBC :P

been there

hopefully there wont be a next time mate, i'll be sure to disconnect the battery from now on, the fact this was burnt and loose made my mind up... glad it worked otherwise id of been in the doghoudr :-\ thanks