Solved Thinkpad R51 Charging Problems

December 1, 2011 at 16:58:35
Specs: Windows XP, 1.5gz 2gb ram
I replaced the motherboard in my dad's old Thinkpad R51 laptop about a year ago. Everything was running fine until a few days ago. The battery won't charge. I'm fortunate to have another machine just like it, so I used laptop #2's power supply to no avail. I took the battery out and put in the battery from laptop #2.. That worked but it still wouldn't charge with any of the three power supplies I have and the laptop died after 20 minutes. The battery I used works in laptop #2 with either power supply, but not in laptop #1. I plan to open the laptop tomorrow. What kind of problems should I look for?

Both batteries and all three power supplies are IBM products and not cheap replacements.


See More: Thinkpad R51 Charging Problems

Report •


#1
December 2, 2011 at 09:50:22
✔ Best Answer
Hope you have a 1 yr (or longer) warranty on that replacement MOBO...it sounds like the charging circuit on the MOBO is the culprit, and isn't charging the battery.

MOOOOooove! OH and you're welcome!


Report •

#2
December 2, 2011 at 10:17:20
Sadly, no. The motherboard was purchased from ebay. Is that something fixable or should I just replace the mobo again? Could this be a cold joint or short circuit? I'd like the chance to fix it if possible, not just to save money but to learn a little more. Thanks for your quick reply.

Report •

#3
December 5, 2011 at 11:24:01
In your first post, does the unit #1 (being the unit with charging issues) run on AC power?

MOOOOooove! OH and you're welcome!


Report •

Related Solutions

#4
December 6, 2011 at 14:02:30
No luck running on A/C power. I wish that wasn't the case because he wouldn't mind having to keep it plugged in.

Report •

#5
December 7, 2011 at 14:44:19
Shame. Yes, it's either a bad charging circuit or bad AC connector on the motherboard.

(I have an old ThinkPad 365 XD [ and I mean Old! Pentium 133 Mhz] that would only run on battery too. saving it for the museum).

MOOOOooove! OH and you're welcome!


Report •

#6
December 7, 2011 at 16:00:18
Would it help to know that the computer usually beeped once when plugged in? Would that narrow it down to the charging circuit or AC connector? I plan on replacing the motherboard when the money is in place.

Report •

#7
December 8, 2011 at 11:33:07
Possibly....could be a beep code. You may want to look that up on IBMs site.

MOOOOooove! OH and you're welcome!


Report •

#8
December 9, 2011 at 11:16:23
To clarify. The beep I was referring to no longer works. It used to beep when I plugged in the charger to alert me it was charging. I wasn't talking about the beep code.

Report •


Ask Question