Search found 5 matches

by lantian
Mon Sep 05, 2011 2:36 am
Forum: ThinkPad X2/X3/X4x Series incl. X41 Tablet
Topic: X31 Charging circuit problem
Replies: 7
Views: 1581

Re: X31 Charging circuit problem

Well, unfortunately no. I have been playing around with MOSFETs around the power cord and replaced a few but with no luck. Finally I have ordered replacement MB from ebay..

I can send you complete circuit diagrams of X31 boards if you want.
by lantian
Sat Nov 20, 2010 11:26 am
Forum: ThinkPad X2/X3/X4x Series incl. X41 Tablet
Topic: X31 Charging circuit problem
Replies: 7
Views: 1581

Re: X31 Charging circuit problem

Tried throwing it into fridge, it worked for couple minutes, but after that, same problem. Anyway, I've done some research and it look like one of main MOSFETs have bigger leakage on DS diode than others (according to datasheets). Similar problem has been solved here: http://thinkpads.com/forum/view...
by lantian
Thu Nov 18, 2010 11:36 am
Forum: ThinkPad X2/X3/X4x Series incl. X41 Tablet
Topic: X31 Charging circuit problem
Replies: 7
Views: 1581

Re: X31 Charging circuit problem

Bump. Still desperate.. It looks like I should get a new motherboard for my X31..
by lantian
Mon Nov 01, 2010 1:15 pm
Forum: ThinkPad X2/X3/X4x Series incl. X41 Tablet
Topic: X31 Charging circuit problem
Replies: 7
Views: 1581

Re: X31 Charging circuit problem

Well thanks for answer. I found similar problems on asus eee forums and it was the coils as i stated above.. Also I noticed, that the problem is maybye temperature related, so it could be the coils. Will try to strip entire laptop to bits and mess around with that coils. Hope it will be only cold wi...
by lantian
Sun Oct 31, 2010 3:24 pm
Forum: ThinkPad X2/X3/X4x Series incl. X41 Tablet
Topic: X31 Charging circuit problem
Replies: 7
Views: 1581

X31 Charging circuit problem

Hi guys, I have some troubles with my X31 (2673-RG6). After the battery gets fully charged, the power circuit should switch to ac power only, but it doesn't. It starts randomly switching between battery and ac mode and a high pitch noise appears (like from LCD inverter, with faulty coil, but mine in...

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