Toshiba L300 Image Issues when entering OS

[magneh]

Hello!

I've got a toshiba L300 with this graphics issues when entering windows.
See photos attached.

Does anyone knows what causes this issue?
Bad GPU?
Bad cpu vcc?

The laptop boots normally with no graphics issues till entering windows. In bios etc image is OK. Third photo is when connected to external monitor.

Thanks!

[rievax_60]

Re: Toshiba L300 Image Issues when entering OS

It might be the CPU Vcore capacitor problem. Does it work ok on battery only power?

[magneh]

Re: Toshiba L300 Image Issues when entering OS

It might be the CPU Vcore capacitor problem. Does it work ok on battery only power?

I got the laptop without battery...

I cant test without DC adapter.

NEc tokin issue here?

Thanks!

[senchire]

Re: Toshiba L300 Image Issues when entering OS

Not same series nor maker but have currently the Dell inspirion 8500 which gets random artifacts (same like yours) in my case the GPU needed a reflow.

[thodoris10]

Re: Toshiba L300 Image Issues when entering OS

Replace the NECTOKIN capacitor, i had issues like this with similar toshiba L300.

[rievax_60]

Re: Toshiba L300 Image Issues when entering OS

Let us know what you are doing before each step. There is a lot to know and the other thread is very large now.
https://www.badcaps.net/forum/showth...315#post437315
https://www.badcaps.net/forum/showth...160#post422160
https://www.badcaps.net/forum/showth...991#post404991

[Djosla]

Re: Toshiba L300 Image Issues when entering OS

i think that this is typical gpu failure...

[magneh]

Re: Toshiba L300 Image Issues when entering OS

Hum...

Any way to test if it's Nek Tokin or GPU issue ?

Cheers!

[rievax_60]

Re: Toshiba L300 Image Issues when entering OS

I use an oscilloscope to check for ripple on the Vcore rail.
Or try it on battery if you can borrow one. Also see how far it gets in safe mode.

[alihomee]

Re: Toshiba L300 Image Issues when entering OS

just change that big caps every thing will be good..............................i done more then 70 times

[magneh]

Re: Toshiba L300 Image Issues when entering OS

just change that big caps every thing will be good..............................i done more then 70 times

Ehehe aren't you fed up allready ?? 70?? omg

With same symptoms?

Cheers!

[alihomee]

Re: Toshiba L300 Image Issues when entering OS

its my daily job playing with mobos and for every single unit getting money.......

[magneh]

Re: Toshiba L300 Image Issues when entering OS

Well got some caps to change the Nec Tokin and started by removing the original one.

The old capacitor was shred up during the removal, but he's no longer needed

Tried to clean up the pads and to put some solder on it , but it's impossible!

Tried to rienforce it and I think I made it worse!
And solder does not stick to it!

I made some soldering and I never got this problem...
Hope that this mess hasn't "killed" the Mobo...

I'll put some pics and i'll wait for your thoughs.

Cheers!

[senchire]

Re: Toshiba L300 Image Issues when entering OS

O.o with what did you remove that one with a knife xD?

[magneh]

Re: Toshiba L300 Image Issues when entering OS

screwdriver and reballing tool

[rievax_60]

Re: Toshiba L300 Image Issues when entering OS

I think your iron is too small. Did you look at the links in my earlier post?

[Th3_uN1Qu3]

Re: Toshiba L300 Image Issues when entering OS

I think your iron is too small.

Same here. The board looks just fine, and you should be able to attach the capacitors to it. You need at least a 60W iron to do the job though.

[magneh]

Re: Toshiba L300 Image Issues when entering OS

Same here. The board looks just fine, and you should be able to attach the capacitors to it. You need at least a 60W iron to do the job though.

Hello!
Thanks for the reply guys!

I just mesured continuity with DMM between all 4 stripes of contact, and the are all shorted ...

I've set the iron in the 450ºC and still I couldnt melt the solder in the pads.

Dead mobo? :/

[rievax_60]

Re: Toshiba L300 Image Issues when entering OS

Hello!
Thanks for the reply guys!

I just mesured continuity with DMM between all 4 stripes of contact, and the are all shorted ...

I've set the iron in the 450ºC and still I couldnt melt the solder in the pads.

Dead mobo? :/

You could be measuring the CPU resistance, about 5 ohms.
Try removing the CPU and testing again.
There is much more to soldering than the temperature setting. Did you look at the links in my earlier post? I need to know how much notice you take of information that you are given.

[c_hegge]

Re: Toshiba L300 Image Issues when entering OS

I've set the iron in the 450ºC and still I couldn't melt the solder in the pads.

Dead mobo? :/

How many watts is your iron? The large copper ground planes on motherboards will draw the heat away from the iron, and, if it's lower wattage, it may not be able to maintain 450ºC.