T23 detect battery but cant charge(Found the problem)

[ronald_loulan]

Hi guys.
I hv a Ibm T23 which doesn't charge the battery recently.
I notice the indicator stop functioning which previously was blinking orange light all the time.
It can detect the battery but juz cant charge the battery.
BUt the battery can be charged on other laptop.
What is the problem wif my laptop???
Anyway to fix it??
Thanks in advance...

[Harryc]

Loose inductor or blown fuse -
http://forum.thinkpads.com/viewtopic.php?f=28&t=82708

[ronald_loulan]

ok,got tat...
goin to check it today...
btw if the fuse really blown,wat can i do?
direct it wif a wire..??

[Harryc]

No, bypassing a fuse with wire is a bad idea. Get another fuse and piggyback solder it over the current fuse. It must be the same fuse or have the same rating.

[ronald_loulan]

I check the White Block fuse n the F9 fuse..
Both got continuity n almost 0.00ohm...

[ronald_loulan]

How to check the black square with a circular ring on top???
I check wif ohmmeter n it indicate tat it hv continuity almost 0.00ohm...

[Harryc]

Put a fingernail underneath one side then the other of the inductor and pull up. If it flies off it needs to be resoldered. If not it is most likely OK.

[ronald_loulan]

Hi guys,i already double checked the inductor and confirm that it ok coz there's continuity even i try to shake the inductor...
I checked the power pins that charge the battery :
------ A
---- B
---- C
---- D

---- E


A+E=0.20v
A+D=3.80v
A+C=3.80v
A+B=3.80v

But i check with another T22 the result is different :

A+E=0.20v
A+D=5.00v
A+C=5.00v
A+B=5.00v

What is the problem?? The charging indicator didnt turn on at all...
Help me please...
Thanks in advance..

[Luizapper]

I've other solution, if there is no problem with inductors like on my t23, since it can charge other battery packs, you can dismantle the battery (quite hard) and unsolder its charging board (wires) from the cells and solder again.

This procedure worked on a non-original battery pack (2-power brand) that I bought recently. I forced the battery full discharge and it never charged again, no battery indication on windows taskbar gauge and blinking orange charge light.

I think that unsoldering internal battery board resets some sensor or something that blocks battery detection.

Years ago I have this problem with a 770 battery, it never raises 0% when charging, so I shortcut the negative pole pin with the other pins except the positive pole pin, and that allow the battery to charge too.

I hope this solve your problem

Cheers

[ronald_loulan]

I found out the problem.
The IC at G5 is burned...
Saw 2 pins were burned n disconnected...
So i think i've got nothing else to do except to replace the mobo...

[rkawakami]

That's the battery charger controller chip, an Analog Devices ADP3806. It would be very difficult to replace one without special surface-mounting tools.

ref: http://forum.thinkpads.com/viewtopic.php?t=37956