Today i tried with voltage injection, i hooked my power supply instead of the battery and closely monitored the current.
The broken board has a constant draw of 250mA, moreover i checked all the power rails:
1.8 has 1.82V,
3.3 has 3.3V
5 has 5.3V
1v (right under the processor) 1.00V

If there was a short somewhere these rails would not be at the right voltage, right?

I also noticed that very very slowly, the processor warms up, however it never exceeds "barely warm" temperature (finger wise, i unfortunately do not have a thermometer)....

mon2[USER="295753"]mon2[/USER] im checking around for other shorts although i am not sure. I do have an hot air station but not a reball station so for now i'd rather not remove the...

Hello,

While diagnosing a No Video issue (which i believe was the LCD, since with HDMI screen there would be video no problem) i, being the ret*** that i am, unplugged the EDP cable while the machine was powered on.
As result, it turned off, never to turn on again. There's no Fans, no power LED, no charging LED, not a single sign of life.

Whenever i power the board, being it by plugging the battery or the AC, the only thing that happens is the ThinkShield chip overheating to level unbearable to touch.
I fingered every other component on the board very meticulously,...

Thank you for your reply, i tried checking every inductor on both boards and i have to say the difference in resistance to ground is pretty big.
[CODE]
Component,Working,Broken
L2001, 324, 70
L2401, inf, inf
L2101, 280, 31
L2604, 991, 1084
L1904, 290, 32
L1901, 1328, 1388
L1902, 1328, 1390
L1903, 287, 33
OTHER SIDE
L2105, inf, inf
L2503, 757, 757
L2501, 1305, 1340
L1906, 21000, 25000
L1101, 6.5, 6.5
L1102, 740, 345
[/CODE]
i also noticed that the mask layer is a different shade of...

The working one powers without issue from the battery, charges well with a 5V5A charger i have (although original one is 5V2A).
The working one does not power with AC only it needs to have a battery inserted, even if flat.

The non-working one(s) do not power from AC, even with a fully charged known-good battery inserted. If a battery is inserted, it will charge (the device will draw 5V 1.3A-ish) but no signs of life other than the coil whine from what looks like a boost circuit (working unit has this whine too)...

I cannot believe i made such mistake in the title, i just noticed the "2679" while it should be "3679". But anyway the detail URL is correct so the board pictures are too.
The picture you posted looks about right i'd say

I've got relatively many of them, would it help my cause if i promised a free one to whoever helps with a final solution? 😁
As long as you're based in Europe i can ship you one if you help me get them working.
Also i'd like to clarify that i am fixing them not for profit, i don't plan to sell them but to give them to family and friends, together with some embedded applications i have in mind, their processor is still quite nice.

Hello,

I recently got my hands on a batch of Thinkpad Tablet 2 that a local business was throwing away. They all have the same issue, no Power.
I do have a working one that i also took and the first thing i did was trying to power it without the battery being inserted.
It seems that these tablets do not work unless the battery is in (my PSU is 5V5A so i doubt it's a current thing, probably design).
I thought i'd be lucky so i took the battery from the working one and i tried it in 2-3 of the broken ones, but no luck, still no power.
The current draw is 18mA...

Hello,

I'm just a young guy from Italy, my daily job is in IT but i have a perpetual passion for electronics, i often take up repair jobs from friends with no charges, only the condition "if i manage it's free, if i don't and it explodes you will not blame me"
I am modestly pretty good at SMD soldering, i have a very steady hand and little to none flux obsession.
I always went blind or by logic with repairs, it's the first time i stumble upon this site and the prospect of having Schematics is pretty exciting.
As i mentioned everything i do is in my spare...