T20 Power up problem

[yok]

I have a Thinkpad t20 that won't power up,when i plug the AC power the batery led (yello)flashes once and nothing happens and nothing happens when i press the power on button.

And when i press the power button for a few seconds then plug The AC adapter, All The LED lights flashes and goes off ,no booting nothing.

i tested the ac adapter and th input connector they are all good.i took out the battery charget outside put it back and it boots.


what maybe the problem,Please help.

[phelix]

Do a search; this is a common problem. Normal solution is a new motherboard.

[yok]

why a new motherboard since it works with a charged battery!!!!!

[rkawakami]

why a new motherboard since it works with a charged battery!!!!!

Could be the motherboard OR could be the AC adapter. How did you test the adapter? If you just measured the voltage that may not be enough. There could be a problem with supplying the proper amount of current. The best way to verify that the AC adapter is working is to power a different Thinkpad system with it. Or, use a different AC adpater on your system.

If the AC adapter is working with another Thinkpad, then most likely the problem is on your T20's motherboard. There are four ways that the system can receive power:

- DC input jack on the back panel
- main battery
- Ultrabay battery
- docking port

Each power source goes to a different part of the motherboard's power circuit. You could have a problem with only the DC input jack, yet the laptop will work from the other three sources.