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t42 100% no power

T4x series specific matters only
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shfil
Posts: 1
Joined: Thu Aug 15, 2019 11:21 am
Location: Coaland, BG

t42 100% no power

#1 Post by shfil » Thu Aug 15, 2019 11:34 am

Hi, I've obtained t42 with dead motherboard, but also with no part missing. It's my first approach to fix dead mb, I'll grateful for tips. :)

So:
Diode of power supply doesn't turn on, also no reaction after pressing power button.
Tested power supply, voltage is around 16v. (As I guess should be.)

After opening lid, I have two idea:
First is corrosion probably caused by bios battery.

https://user-images.githubusercontent.c ... f59084.jpg

Second are capacitors closest to power plug.

What do you think I also should check (and how)?

admin edit, picture size too large..
x230, t400 and dead t42

SMA
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Joined: Fri Jun 29, 2007 3:48 pm
Location: Copenhagen, Denmark

Re: t42 100% no power

#2 Post by SMA » Fri Aug 16, 2019 6:27 pm

It could be the classic "coffee in the keyboard" case.
Take a look at the backside of the keyboard - look for signs of dryed out coffee or similar.

wujstefan
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Joined: Fri Mar 04, 2011 8:38 am
Location: Tarnow, Poland

Re: t42 100% no power

#3 Post by wujstefan » Mon Aug 19, 2019 8:26 am

SMA wrote:
Fri Aug 16, 2019 6:27 pm
It could be the classic "coffee in the keyboard" case.
+1

Cheapest way is to source a new MB ;)
Too many thinkpads not enough time!
(stable under reduction)

kfzhu1229
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Location: Toronto, Canada

Re: t42 100% no power

#4 Post by kfzhu1229 » Tue Aug 20, 2019 2:09 am

Um clean the corrosion with Alcohol asap as the corrosion will only spread day by day.
And by seeing the picture, I am pretty sure there is a capacitor over there on your top circle, similar to the one on the left beside it. The components in that area are essential to the computer getting power properly (realised that after one of the metal prongs on the palmrest accidentally folded down shorting the motherboard, turning the computer off every time I press on the palmrest, and that metal prong turned black by the time I noticed it a few hours later).
_________________________________
T23 PIII 1.13ghz 1gb W7
2xT43 14.1" 2.26 SXGA+ 2gb 1*fp W10
T530i 15.6" i7 16gb fp W10
Flexview UXGA:
A30p PIII 1.2 1gb W7 (IDTech)
T43p 2.26 2gb fp W10

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