T40 refuses to turn on or charge *PIC*

[AminAhmadi]

So the T40 was running fine, turned it off at night took it in the mornin g and then in the afternoon it refuses to turn on or charge the battery

I have the whole thing open and I have checked all the fuses! it happened in the past that when the USB shorted it dies like this until unplugged or a few weeks ago I got water in there, I had to dry it out and it worked fine until yesterday ?

is there some common failure point for the T4x in the power supply circuit?


thanks

[Robbyrobot]

Am I understanding correctly that somehow the USB port was short-circuited (once or several times?) and that you spilled water on the computer (and immediately unplugged the AC adapter and removed the bateries?)?

If so, I think it's a wonder it functioned at all afterwards. My guess is that now you've gotten some corrosion on the mainboard due to the water. Best thing would be to dismantle the computer right down to the mainboard, inspect it in detail with a magnifying glass, cleaning off any corrosion you see with a toothbrush, isopropanol and perhaps (carefully) an Xacto knife. Then wash the mainboard in isopropanol to remove any traces of water still remaining and try again.

Take a look at what a coffee spill did to a T40:

And no, it doesn't work any more either, not even with a new power chip.

Moderator or OP: please change the subject to reflect the image. Thanks!

[rkawakami]

is there some common failure point for the T4x in the power supply circuit?

That's kind of what I'd like to know too . I have a couple of T41 motherboards which do not exhibit any signs of life. No power LED, no battery charge, no power up, nothing... They have been sitting around gathering dust while I work on more important projects. I haven't spent the time eyeballing the boards to see if there's any obvious scorch marks or blown fuses but I guess I'll eventually get to them.

[Tim M]

I haven't spent the time eyeballing the boards to see if there's any obvious scorch marks or blown fuses but I guess I'll eventually get to them.

Can't let the magic smoke escape...

[AminAhmadi]

I appreciate the responces,
It is not like I swam with the thing and plugged it in to see what happens. Water spilled on it, I sped to unplug it, didn't quite work after until I dried the living life out of it.

It was running for a good few feeks after that. There is no corrosion on it, pure water barely causes any but it was dried anyways.

That and the unfortunate USB shorts caused by others not me, might have stressed the thing but didn't cause immediate death. This has been one trooper and that makes me more sad to see it leave like this.

I have found at least one dead FET so far that I will change to see what happens. I think it is one of the 5Vs and when you look at the back it is under the power plug area. there is an inductor and it is near there FDS6990. I need to get that and change it and go from there.


The thing was built in Dec 2003, which makes it more than 4 years old and that is really the average age of these things. COnsidering it has been running like a ceiling fan.

The ADPxxxx battery charger has its SD signal turned off, it could really be the EC acting up and not turning things on. There is 5V and 3.3V at the power supply near the hard drive.

Any input is welcome.


I was planning to save my files from the disk using my sister's T61, guess what? that one is SATA:S son of a [censored] I said

[rkawakami]

Can't let the magic smoke escape...

Been there, done that #1...
Been there, done that #2...

[davidspalding]

Does it power up WITHOUT the battery? I have a T60 here (work) with a battery that kills the laptop. Boots up and works normally without the battery. (Yes, with the adapter. I used up all my Scrolls of Fusion Power.)

[AminAhmadi]

No it is dead with or without.

But I have to change that FET still and see what happens. To cheap to pay the shipping on digikey waiting for some other parts and then will do them all at once.