Question about IBM ThinkPad T21 Notebook

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IBM Thinkpad T21

Pls. help. IBM Thinkpad T21 don't charge the battery pack but the battery pack is good. I also tried to remove the battery pack then power it with the AC adapter and it shows 0190 Critical Battery Low then it turned off. Thanks.

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  • Anonymous Mar 25, 2014

    low charge lights showing after being on charge for 24 hours

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This is a common problem with the T20 series Thinkpad. The problem is with the power management chip. Unfortunately, you will have to replace the motherboard to fix it. Since these are a bit on the older side, you can get a motherboard off Ebay at a reasonable price.

Posted on Aug 05, 2008

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Posted on Jan 02, 2017

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How do i get into bios on a ibm thinkpad 1800/R52? seems like it needs a password. all i want to do is reinstall windows and i cant boot from cd


helo

go to the link below to get further assistance
but basically to reset the password, follow these steps.

If the Power-on password (POP) is forgotten and the Supervisor password is known, simply go into the ThinkPad BIOS setup utility and reset the Power-on password, otherwise try the following:
  1. Turn off the computer.
  2. Remove the battery pack.
  3. Remove the backup battery (CMOS battery --size of coin- located on mainboard, requires you to remove the plastic cover on rear on computer)
  4. Turn on the computer and wait until the POST ends. After the POST ends, the password prompt does not appear. The POP has been removed.
  5. Reinstall the backup battery and the battery pack.
    Note: Some ThinkPad systems have the ability to reset the Power-on passwords in the ThinkPad BIOS setup utility if a Supervisor password has been set.
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-59377

if this helps, please rate my service -- if not let me know - i will continue to help

Nov 22, 2010 | Lenovo ThinkPad T21 2647 Notebook

1 Answer

Computer was on AC power. Left unattended it shut down. Would not wakeup. Shut down fully, it would not come back up. Get a 2 short beep code. Invites an F1 to go to setup. Won't go to setup. Screen then...


Can you tell if your AC power cord is working? (Is there a light on the computer that comes on when it's charging?) If the power pack went dead, your battery could've died and now you get no power to the PC which is why it won't boot up.

To test, take out the battery and plug the AC cord in and try to boot up. If nothing at all happens without the battery, then your power cord or power pack is dead, and you just need to replace it.

May 29, 2010 | IBM ThinkPad T21 Notebook

2 Answers

IBM T21 doesn't start


try to start it with the battery out by pluging it straight, the battery is dead and its causing problems

Mar 13, 2008 | IBM ThinkPad T21 2647 Notebook

1 Answer

T21 will not run off battery


Hi,
Either you got another bad battery, or the power bar in the laptop isn't distributing power correctly.
That's about the only options.
If you can, check the pins for current where the battery plugs in, to see if it's getting juice.
Good luck

Dec 03, 2007 | IBM ThinkPad T21 Notebook

1 Answer

IBM Thinkpad T21


T21
Input Voltage: AC 100-240V, 50-60Hz Output Voltage: DC 16V, 4.5A, 72W Max

You can get one on EBAY for cheap.
http://cgi.ebay.com/Laptop-AC-Adapter-Charger-for-IBM-Thinkpad-T21-2648_W0QQitemZ300173112123QQcmdZViewItem

Nov 19, 2007 | IBM ThinkPad T21 2648 Notebook

5 Answers

Laptop is locked out


This works great
Forgotten Power-on password
If the Power-on password is forgotten
and the Supervisor password is known,
simply go into the ThinkPad BIOS setup
utility and reset the Power-on password,
otherwise try the following:
Turn off the computer.
Remove the battery pack.
Remove the backup battery. This is
located under the battery.
Turn on the computer and wait until the
POST ends. After the POST ends, the
password prompt does not appear. The POP
has been removed.
Reinstall the backup battery and the
battery pack.
Note: Some ThinkPad systems have the
ability to reset the Power-on passwords
in the ThinkPad BIOS setup utility if a
Supervisor password has been set.

Oct 30, 2007 | IBM ThinkPad T21 Notebook

3 Answers

IBM T21


i have the same problem. actually its a common problem for many T21 and other old IBM laptops.
i searched that you have to take all power (batery, adaptor)
press the power 10 times and press it for 30 secs then reinsert the battery or adaptor and try to power it on.
they say its done to discharge a certain capacitor that got overcharged after overcharging the battery.
that worked for me before but now my T21 wont start any more with this process.

May 20, 2007 | IBM ThinkPad T21 Notebook

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