Question about IBM ThinkPad T21 2647 Notebook

Open Question

Pressing power button does not apply power to laptop.

Where can I find the schematic diagram for the power control/battery charging circuit for an IBM T21 Think pad?
Thank you.

Posted by on

5 Suggested Answers

ctf1800
  • 4402 Answers

SOURCE: locked screen

emove the CMOS battery, POP will be vanished right away. But after that, you have to enter BIOS to set the time/date, otherwise laptop won't boot.
if that doesnt work goto
http://www.passwordmethod.com/

Posted on Jan 02, 2008

Pterocarpous
  • 202 Answers

SOURCE: IBM Thinkpad T21 LCD problem

Hello shadl

Am I understanding your correctly? - the monitor of your T21 is working intermittently? Please, let me know if I've misunderstood your description of the problem.
------
If the issue is w/ the monitor, ....

And the symptoms are intermittent and change w/ opening and closing the cover (monitor) then there's a good possibility the problem isn't w/ the monitor itself rather it's w/ the cables or wiring going from the monitor to the mainboard. If that is the case, whether it is repairable w/o replacing the monitor will depend upon the cables and/or wiring involved.

It would make sense that an issue like that was caused by worn or damaged cables/wiring as those are the parts of the monitor that would've been subject to wear and tear over time.

I recommend you disassemble the monitor from the laptop and carefully inspect all the cables and wiring that run between the monitor and the laptop.
I will see if I can find a service manual online for you that will step you through removing the monitor.

If it does turn out that the problem is w/ the monitor itself or that the monitor's wiring or cables cannot be repaired, you can search the Internet for another Thinkpad T21 that you can salvage parts off of. (eBay would be one good place to look.) You can try finding just the monitor but I think you'll stand a better chance at finding a T21 that is being sold for salvage.

In the interim, you should be able to connect an external monitor and use the computer w/ it for now.

IF you connect an external monitor and the symptoms persist, then the problem isn't w/ your monitor at all. Be sure to post back here and let us know if that is the case, too.

***************
Please, let me know if this response was "Helpful" or a "FixYa" for you or, of course, if you have additional questions, etc on this topic.

If I did not answer your question satisfactorially, plz, b4 assigning a "Thanks for Trying" or lower rating to my "Solution", let me know. I may have misunderstood you or the problem you are experiencing. In any case, I will work w/ you until your problem is resolved or diagnosed. I promise! :)

Thank you
BJ
***************

Posted on Apr 05, 2008

sands2499
  • 18 Answers

SOURCE: IBM Think pad T21 Notebook can not boot!! Help please

Run IBM BIOS Setup
Utility to reset the time and date.

Posted on Jul 18, 2008

Pyrhyc
  • 2028 Answers

SOURCE: IBM Thinkpad T21

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

  • 3 Answers

SOURCE: IBM T21 Thinkpad

Here are the solutions ive gathered for this problem:

================

IBM has finally given me a fix for the T21 I am working on for a

customer. I asked them "What if it doesn't work, then what. Their

response was "GAURENTEED to work". Here it is:

1.) Unplug the power cord and the battery.
2.) Press the 'Power' Button 10 times repeatedly.
3.) Then hold the 'Power' Button down for 25 seconds.
4.) Put the battery back in and plug the power cord back in.
5.) Should power up right away.

This did work THIS time on the machine I have in front of me. I hope

this works for all of you. If you have any other questions, please

feel free to email me and ask any questions

Oh and just one more thing to help you out.

This problem is caused by an overcharged capacitor (supposedly) and

the error ONLY occurs IF you leave the laptop plugged in too long with

the battery in. If you ONLY plug it in when you are using it, then it

should not overcharge. And actually I would suggest that you unplug it

about 20 min or so before you are done using the system.

=====================

I have been a IBM Thinkpad T20 user for last 3+ years and I think it

is an very sturdy system that it's been working non-stop for such a

long time with not a single problem even after so much of abuse it

went thru in my baby's hands......until last week when it just wont

boot up. Then I found this post online....I tried the refrigerator

option also to no avail. Finally I just removed the battery and AC and

let the system sit for a 2 days in a cool place near window. Third day

I plugged in battery, plugged in the AC, and voila, it comes up fine.

Right now I am backing up all my files and I'll keep you posted if it

experiences a boot problem again. If I don't post again, assume it's

all working good again !!

Bottom line is that it could be the overcharged capacitor in my case

and letting it sit alone discharged it completely.

Good luck to you!

==================

I have the same problem, and i fix it. Well no fix but now in few

seconds i can start notepad when i want to. My battery dead. Without

the battery, you can start if you hold down the power botton while you

get in/get out quickly the ac connector several times .Try it!!!!

I think the intelligent battery or same cheap condensator in the power

module is the problem (so when you connect the ac power connector you

can hear the charge of it).

you can restart without problem but if you switch off you will need to

repeat the process to start the notepad.

====================

I have a T22 that won't power on. After removing the AC power cord, I had to repeatedly (as fast as you can press it) press the power button until it powers on. I was not able to do a normal shut down, it would just hang. So with the battery removed and the AC plugged in pull the AC power cord.(Try to do it when the hard drive light is out!)I have cycled thru several power ups with no problems after doing this.
Hope this might help somebody else.
I would love to know which capacitor is being affected on the motherboard. this way you could install a momentary switch with resistor to ground to drain the capacitor.

===============

Thanx to all the authors of these solutions

Posted on Jan 10, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Hi,my notebook is not turning on .Charging is good .When i press switch button charging process is stopping to 1-2 seconds then continues .Maybe problems in motherboard?Product Details for ASUS F5RL-X1...


1. Take the battery out of the laptop & try to turn on the laptop using power adapter only. If the computer turns on, then the battery is defective & needs to be replaced.
2. Make sure the power adapter is not defective. Test the output voltage of the power adapter using a voltmeter. Compare the voltmeter reading to the nominal value written on the adapter or the laptop.
3. Make sure the DC jack is not loose or broken. A loose DC jack will need to be re-soldered. A broken one will need to be replaced.
4. If you have another processor which is compatible with your laptop's model, try swapping processors & test to see if the laptop will work.
5. The power button could be bad.

6. The motherboard could be defective & needs to be replaced.

Sep 16, 2010 | ASUS F5RL-X1 Notebook

1 Answer

Dear sir do you happen to have circuit diagram for acer aspire 5570 , the 19v dc power in connection pin broke in two. i need the schematic diagram for this power system board which lead to the...


Connect the adapter to the laptop and power it up, then look at the power/battery charging LED light and wriggle the power plug in the laptop's power socket. If the power/battery LED light flashes and in a certain position this LED light stays firm, then the power socket is either faulty or it has a dry solder joint where it is connected to the motherboard.
This can be repaired but it requires the laptop to be completely dismantled to get at this power socket and repair. If you cannot DIY then I suggest you get a quote first.

Sep 10, 2010 | Computers & Internet

1 Answer

In my IBM T23 Thinkpad battery is fully charged showing green light constantly but not able to switch 'ON' after pressing the power button. What should I do?


try to switch it on with power cord still plug in it, if it do boot-up, you have to replace your baterry, if not somethings wrong with your laptop

May 06, 2010 | IBM ThinkPad T23 2647 Notebook

1 Answer

I need to know what each color means on my distributor???


Review this guide as reference; this Electrical Schematic Diagram applies for 1994 Accord Coupe series of model. Here you will find complete explanation about electrical system of the vehicle. Started from Troubleshooting (tips and precautions) on handling the electrical system, in this manual you will be guided step by step examining each electrical component installed and its connection for example in Wire Harness and Ground Location, started from Engine Compartment, wiring harness is shown from engine ground cable, starter cable, and battery ground cable.

These 359 pages of pdf.fieltype manual is divided into some sections which are Wire Color Code, Relay and Control Unit Location, Wire Harness and Ground Location, Air Conditioning System Circuit, Anti-lock Brake System, Battery, Blower Control, Charging System, Cruise Control, Fan Control, Fuel Pump, Fuses, Ground Distribution, Heater Control, Ignition System Control, Lighting System, and etc.
Download the complete 1994 Accord Coupe Electrical Schematic Diagram here.

You can also find complete workshop manual of 1994 Accord Coupe here.

Pass: freepdfmanual.com

Good luck.

Sep 21, 2009 | 1997 Honda Accord

2 Answers

T23 IBM will not operate on battery power & won't charge battery.


The battery has likely been charged one too many times and will no longer hold a charge. Buy a new battery.

Mar 08, 2009 | IBM ThinkPad T23 2647 Notebook

1 Answer

Hibernate


When Windows opens then -
Open Control Panel - then click on Power Options - Click on Hibernate tab and uncheck Enable Hibernate - Click OK

Feb 13, 2009 | IBM ThinkPad T23 2647 Notebook

1 Answer

IBM T40 the battery is fully charged but will not power on with the ac


Have you disabled your battery
is your battery showing
check control panel\power options
does your battery show as 100 % charged
then you can also check device manager for battery
Let me know

Jan 29, 2009 | IBM ThinkPad T40 2373 Notebook

1 Answer

I have IBM R40 Laptop


Try pressing the power button next time. That will help you to turn on from an Hibernation.
Alternative you can disable this feature (not recommended for laptops)
  1. Open Control Panel.
    • On the Windows XP default Start menu, click Control Panel.
    • On the Windows XP classic Start menu, point to Settings, and then click Control Panel.

  2. In Control Panel, open Power Options.
    • If the computer is in Category View, click Performance and Maintenance, and then click Power Options.
    • If the computer is in Classic View, double-click the Power Options icon.

  3. In the Power Options Properties dialog box, click the Hibernate tab.
  4. On the Hibernate tab, clear the Enable hibernatation check box, click Apply, and then click OK.

Jan 10, 2009 | IBM ThinkPad R40 2897 Notebook

1 Answer

Thinkpad A31 2652


Sometimes a BIOS upgrade will cure battery charging behavior... http://www-307.ibm.com/pc/support/site.wss/MIGR-44450.html

Feb 16, 2008 | IBM ThinkPad A31 Notebook

Not finding what you are looking for?
IBM ThinkPad T21 2647 Notebook Logo

174 people viewed this question

Ask a Question

Usually answered in minutes!

Top IBM Computers & Internet Experts

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18333 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you an IBM Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...