Help about burnt chip in T23 system board

[Enzo1960]

Hello at the Forum!
I need help: in my ThinkPad T23, model 2647-2TG, burnt this chip, near battery connector, as following image:
http://www.4shared.com/photo/VwyF0QNpba ... 01425.html

Last 2 numbers on burnt chip seems "90A", so I soldered a "FDS 8690AS" desoldered from other (non T23) board.
But, before to mount and connect the battery, I would be sure that this is the right chip.
Can anyone help me?
Thank you in advance, Enzo.

[RealBlackStuff]

Welcome to the Forum.
According to the T23 circuit diagram that should be a Toshiba TPC8203, http://www.datasheetcatalog.com/datashe ... 8203.shtml

Don't know if that Fairchild FDS8690AS is fully compatible, https://www.fairchildsemi.com/pf/FD/FDS8690.html
You do the math.

[Enzo1960]

Thank you VERY much!
However, for sure burnt chip was Fairchild, because Fairchild logo appear still in remaining part of chip.
I let you know how repair works!
P.S.: You're right!
Just checked (on Aliexpress) for Toshiba chip, and I discovered that now it is marked as FDS6690AS.
So, in my opinion, better thing is to insert this Toshiba chip.
I will order it now.

[Enzo1960]

Last news: I replaced it with an FDS6680A.
It don't burned again, but T23 don't boot. I think this is like a short circuit on board, because when I connect power supply, it sounds like a pulse.
So I suspect that some other component(s) are failed.
Can someone please post a schematic that can help me to diagnose failure?
Thank you.

[RealBlackStuff]

Get it here:
http://elektrotanya.com/ibm_thinkpad_t2 ... nload.html
Scroll down to the bottom of the picture, a few lines down you'll see:

This file is downloadable free of charge: ...processing...
(You are not logged in, only 2 downloads per day possible for you.)

Wait until you see:

This file is downloadable free of charge: Get Manual
(You are not logged in, only 2 downloads per day possible for you.)

Then click on Get Manual to start the PDF download.

[Enzo1960]

Ok, thank you!
I hope to solve and resurrect my lovely Thinkpad!