Thinkpads Forum

Hello folks.
I am looking for people who might have an overall knowledge of the charging /power circuits of T60 series (2007-49G).

What happened
I forgot my thinkpad PSU last time traveling to my parents. Ok, then i just hook up another 20V PSU.
However i put +20V to the center pin and 0V/ somewhere in the edge. Later i discovered that both 20V and gnd goes somewhere in inner/outer side of the connector.
I guess this could mean i reversed the power or put +20V to the signal pin... this could definately kill some transistors or diodes!
As a note: I use a docking station, so the power went through the bottom connector.

Current status
With org. PSU: the thinkpad turns up and works fine for 10 sec. Then shuts down.
With fully charged battery: Turn up report "low battery" ... turns off after ~10 sec. (i know the battery got power since i used in other thinkpad)
The charge bettery

Expected flaw
The power converter or charging circuit have a burned diode/transistor

Trying static discharge
I have tried
a)Pull out battery + pull out power.
b)10x power button presses + 1x 30sec press
c) Connect power
d) Turn on
...same result

Wierd bacak to life session ... This is not a solution but migh bring help.
As told i got sec where the thinkpad is fully functional.
This is acutually enough to get into BIOS and play around
I managed to disable the power management.
After this the thinkpad magically worked and i got into Windows.
The battery sensor reported the Battery2 to be dead.... but .. i have never plugged a battery2
This session with booting fine only lastet around half and hour. Then back to 10sec ... turn off. Noo luck fidling with Bios power management.

HELP
I hope to change some defect parts on the PCB from another defect T60P
a) Have anyone experince something similar (noo luck searching the forum)
b) Do anyone have general overview of the main PCB or specially power related.
Where do the 20V go to?
c) Perhabs just a high quality picture of the system board to read of the ICs

I know the T60 is old but i was looking forward to celebrating its 10 year anniversary.

Bad things
I have power problems in past - then frankenpadded it.
1. If T60 was put to sleep and than connected to AC and opened it (woked up) - lights on fan spin for 3s and power down. After that only disconnecting AC and battery makes T60 to boot normally.
2. Couple of times it don't want to start at all. disconnection AC, battery and CMOS (coin) battery under keyboard helped me. <- try this

look on the mainboard near the power socket and docking port for burnt bits you may get luck and its only a 0 ohm resistor blown. id say other than a main board replacement though you are unlikely to fix this one

Welcome to the forum!

Your T60 is a pretty standard (/low-end) T60, I mean with respect to its mobo;

... about the stock configuration for the [url=http://support.lenovo.com/en_DK/landing.page?qpq=2007-49G][color=blue][u]ThinkPad T60 (2007-49G)[/color][/u][/url], Lenovo wrote:T2400 (1.83 GHz), 512 MB RAM, 60 GB 5400 rpm HD, 14.1" 1400x1050 LCD, 64 MB ATI Radeon X1300, CDRW/DVD, Intel 802.11abg wireless, Modem, 1 Gb Ethernet, UltraNav, Secure chip, 6c Li-Ion batt, Win-XP Pro

... so I'd suggest that you consider getting a replacement-mobo, which are pretty cheap on e.g. eBay.de .... see e.g. this, rather than perhaps ending up with a repaired, yet not-fully-reliably system. Alternately, look around on either dba.dk or see the German ThinkPads forum - there you'll no doubt easily find a replacement motherboard (see e.g. this!) sold by a trustworthy person, if you (at some point) decide to take that path.

Good luck with getting your trusty T60 back alive!

Johan

^^^ This.

Not worth the aggravation and work for what is a pretty cheap commodity these days.

Thanks for the replies. I was however hoping for a more repair engouragement than realism (in this forum)
A dead T60 could mean i finally got an reason for buying a Helix.

It is more a geek matter of making it last for 10 years, than sanity.
+ the principal thing that i would hate to throw away the thinkpad just due to a single dead diode.

-FryPpy:
I will try to remove the battery power. However i have already tried to reset in BIOS
Since you "frakkenpadded" et i suppose it did not work sufficiently.
Could you explain exactly which part of the defect T60 you used ?

-gazeddy
I did not see anything looking burned. I will upload a scan (lack of macro camera).
I was hoping to do a side-by-side compairision with the other T60P with non power related defect.
I was hoping for an overall explanation of the ICs.

-Johan
Wow, that cheaper than excepted!
I really should value my spare time more

By visual inspection of the board i do not see anything burned.
I have uploaded a scanned image:google drive

As mentioned before the error seems to cause "Low Battery" messages. For this reason i suspect the chargeing circuit to be a good place to start hunting.
However i have not found any datasheet for the Maxim 8765E (in the package shown)

I hope to put some time into the comparision with a functional T60p this weekend.
Any relevant litteraur /links are more than welcome.

omegasteffy wrote:However i have not found any datasheet for the Maxim 8765E (in the package shown)

Not obvious (at least not to me!) where the MAX8765E mentioned can be seen in your photo, and therefore unable to understand what specific package you refer to? Anyway, a datasheet for the Maxim 8765E (in a "28 Thin QFN package") is easily found; e.g. here.

Best of luck repairing this... I surely support your good intentions!

Johan

The Maxim IC is one of the two with red text over (since the scan was not clear enough)
I counted approximately +8 pins on each side, must must have been too tired.
From the scan i can see that is it a 28 pin.. so i can used the Maxim datasheet i (and you also) found.
Thanks for getting my attention back

omegasteffy wrote: Since you "frakkenpadded" et i suppose it did not work sufficiently.
Could you explain exactly which part of the defect T60 you used ?

No, i can't make it work nice.
ALL except bad mainboard with PCMCI cage and CPU, modem card and it's cord and a couple of screws
You can see frankenpadding photos at http://thinkwiki.de/Frankenpad.

And once more question. What is the yellow wire on your mainboard????

Thanks for the link. I would like to read the text seem interesting, but with my german-skills it takes too long to interpret. (try gTranslate tomorrow)

The yellowwire is not my art, but a hotfix from Lenovo. (seen on other thinkpads too). Small software changed are patched. So are small hardware bugs.