Re: Toshiba l850 screen goes crazy

We can conclude if the problem is with balls by pressing a chip maybe? If we get some good signal then it's worth reballing.
It's somehow logical to me, if there is a physical damage on balls.
But in my case, everything is working fine until stress.
In this case reballing would be actually reflow with extra feature (new balls).

Re: Toshiba l850 screen goes crazy

Oh.. It fails after 30 seconds of furmark.
I found used motherboard for 15€ on local e-commerce. Guy claims that it's working. I will give it a try.
However, since I'm beginner I will use my old board to practice on it.

What is possibility that there is some power issue?Maybe there exists cap that is failing? Since it works for hours until stressed.

Re: Toshiba l850 screen goes crazy

I didn't touch anything. And it is working all day long with no crashes.
Strange...


Thank you guys for response.

Re: Toshiba l850 screen goes crazy

Exactly, it is AMD GPU, 216-0833000.

Since I'm not in business with hardware repair, but I'm interested to learn it and do it as a hobbyist, please, inform me what is the best option for me to fix this problem.
I saw those GPUs on ebay for very cheap.
How hard is it to replace this chip without BGA rework station?
Also, please recommend me some suppliers you trust, if you think that ebay might be a bad choice.

Hello,

Few days ago I turned on my laptop, and when it booted it just freezed and there were lines of all colors across the whole screen. I restarted it but then screen didn't came up, it was black. Not even a backlight.

After two days I turned it on again, and it booted properly, screen was doing good, and then after about 10 minutes of work, screen became colored again with those lines.

Now it puts black and white noise on a screen shortly after displaying Toshiba logo while booting, and then it goes black.

Did anybody experienced...

Re: toshiba l850 repair

Hello,
I have the same problem with my Toshiba l850. When battery is in connected, and when I plug the charger it stays off. But when I plug a charger without battery connected then it turns on automatically. The screen is also black, and I don't get numlock light on the keyboard also. Did you solve problem with your Toshiba and what NB stands for, north bridge?
Thanks in advance.