T42 want to upgrade video chip, so I need a new motherboard, what will be compatible?

Question

Hello, lenovo community.
First time posting here. I have recently been having issues with my T42, type 2373-8tu, where the screen will flicker and/or go blank, then the display will either look staticy (odd for an LCD) or it will just flash a bunch of artifacts (go here and click broken monitor, and that's sort of how my screen looks from time to time). I posted a thread on reddit and a user there suggested it could be an issue with the video chip if it's ATI (which it is). I did some research and found that it is a common problem. 
Now, onto the upgrade. I was looking at the specs page and saw that there is a possible 128MB video chip, but I don't know if it's compatible with the 14.1 inch model (which I have). Further, I don't know which motherboard I would need which would have the video chip I'm looking for. Can any of you with more experience than myself offer some insight on this before I buy anything?
Thanks for your time.
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Answer 1

i_build_franken wrote:
Brilliant! Thanks for that clarification. I opened it up last night to check some internal things and when I put it back together the screen backlight wasn't working. Could this be caused by a loose connection or is it more likely that I messed up the screen now too?
**Edit as of 1741 EST** Also I can't find the FRU for that board. Found the fru so nevermind that. However I don't want the security chip. It seems a lot of people have had issues with it and it seems more trouble than it's worth. Is there a way to get a board with out the security chip? This page doesn't show that's possible for the 128 MB board.
You might have blown the fuse on the motherboard, or it may just have died completely. Hard to tell without knowing more details.
As for the security chip, all of these "p" boards have one AFAIK, just turn it off in BIOS and call it a day, that's what I've been doing for a decade now anyway.
Good luck.
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.