Take a look at our
ThinkPads.com HOME PAGE
For those who might want to contribute to the blog, start here: Editors Alley Topic
Then contact Bill with a Private Message

Charge Circuit - Physical location of TPC8203 on mb

T40/T41/T42/T43 series specific matters only
Post Reply
Message
Author
billymm
Posts: 13
Joined: Tue Oct 16, 2007 9:05 pm
Location: Melbourne, Australia

Charge Circuit - Physical location of TPC8203 on mb

#1 Post by billymm » Thu Oct 08, 2009 10:31 pm

Hi all,

I recently got hold of the t41_block_01_v1.1.pdf charging block diagram for the t41 - huge thanx to whoever did it
It can be found here

Ive got a t40 & was looking for the two TPC8203 fets on the mb. Based on t41_block_01_v1.1.pdf the only fets I can see near the ADP3806 are 2x TPC8014 & a TPC8109 - I think Ive found all the other parts from the block diagram.

Could somebody give a rough indication as to where Id find the TPC8203 on the mb or the mb descriptor (eg U43) that they are near pls?

Thanx in advance,
billy
T40/P 2373 G1M

billymm
Posts: 13
Joined: Tue Oct 16, 2007 9:05 pm
Location: Melbourne, Australia

Re: Charge Circuit - Physical location of TPC8203 on mb

#2 Post by billymm » Thu Oct 15, 2009 9:11 am

After tracing the board I found that the fet used on a t40 is a FDS6990A (Q4) (not a TPC8203), located on the underside of the m/b near the L5 inductor

.... maybe this will help others

billy 8)
T40/P 2373 G1M

w0mbl3
Posts: 10
Joined: Sat Jul 16, 2011 11:09 pm
Location: Sydney, Oz

Re: Charge Circuit - Physical location of TPC8203 on mb

#3 Post by w0mbl3 » Sat Aug 31, 2013 2:00 am

billymm wrote:After tracing the board I found that the fet used on a t40 is a FDS6990A (Q4) (not a TPC8203), located on the underside of the m/b near the L5 inductor

.... maybe this will help others

billy 8)
Thanks! (a few years later, it did indeed help someone :D)

My T41 has the not-charging problem. All fuses check out ok, so I'm going to replace the FET (I kept my old T30 parts, so will steal the TPC8203 off that mobo for the T41).
Got: T61p, T41, T43p
Had: T410, T60, T30, 600e

w0mbl3
Posts: 10
Joined: Sat Jul 16, 2011 11:09 pm
Location: Sydney, Oz

Re: Charge Circuit - Physical location of TPC8203 on mb

#4 Post by w0mbl3 » Sun Sep 01, 2013 10:54 pm

Bleh.. replaced the FET, still got the problem, so by process of elimination, the problem is the controller chip - the adp3805.

Annoyingly, its a different version to the one used on T30, so I don't have a convenient spare.. which means I'll continue to live with no battery-charging on the T41 (its only used by the kids for basic browsing and flash educational stuff).
Got: T61p, T41, T43p
Had: T410, T60, T30, 600e

rkawakami
Admin
Admin
Posts: 10221
Joined: Sun Jun 04, 2006 1:26 am
Location: San Jose, CA 95120 USA
Contact:

Re: Charge Circuit - Physical location of TPC8203 on mb

#5 Post by rkawakami » Sun Sep 01, 2013 11:13 pm

I'd check that L5 inductor. While the T4x systems are not known to have a common problem with loose inductors (like that of the T23), if that inductor is open or detached from the motherboard, then the battery won't charge.
Ray Kawakami
X22 X24 X31 X41 X41T X60 X60s X61 X61s X200 X200s X300 X301 Z60m Z61t Z61p 560 560Z 600 600E 600X T21 T22 T23 T41 T60p T410 T420 T520 W500 W520 R50 A21p A22p A31 A31p
NOTE: All links to PC-Doctor software hosted by me are dead. Files removed 8/28/12 by manufacturer's demand.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post

Return to “ThinkPad T40/T41/T42/T43 Series”

Who is online

Users browsing this forum: No registered users and 37 guests