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Repair information for the Asus Transformer Book T100TA. Released ~2013. Model number: T100TA .

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Shorted caps on the main board - possibly liquid damage

What's up, iFixers :)

Found an old Asus Transformer Book T100TA laying around at home today - it belonged to my relative back in a day.

Tried to turn it on and it won't - only the amber LED next to the power button would blink.

Wen plugged into charge the device would take 1,76 A out of 2 amps that USB port could give

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After a while battery gets insanely hot, so I disconnected the charger. Device still won't power on anyway.

At this point I decided to have a look inside - someone definitely been here before me - half of the screws are missing and I found that all of the caps I marked with red are all shorted to ground:

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At the same time the caps I marked with blue are not shorted.

It could be a result of a liquid damage, because I found way too many traces of that on the keyboard, but could not really find anything obvious on the main board.

Just wondering what might be the cause of the short and if it's reasonable to fix the device just out of curiosity

Update (09/14/23)

So for the sake of convenience here are the images of the board on both sides:

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And once again - I found that caps in the red area are shorted to ground and the ones in the blue are not:

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And today I also found that these caps I marked with red circles are shorted (continuous with zero ohm resistance), so I believe the problem could possibly be one of them.

Wrong - after reassembly I, for one, found that whoever assembled this before forgot to connect an antenna and just hidden antenna wire under the main board, and second - those caps now do show some viable resistance, so I guess they are fine and maybe problem is with some chip.

Update (09/14/23)

Well after finding and reconnecting an antenna wire it all started behaving a bit differently - battery did take around 400 mAh if charge and then the tablet even worked on battery power, so battery is fine.

However both on cable and on battery power it only did blink an amber LED and did nothing else.

I kept investigating and found out that it's not the battery that gets hot - it's one of the chips on the bottom of the motherboard - the one marked with red

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If we look closer - we'll see that there are two similar RAM chips and they are Hynix H9CCNNN8KTML BRNTM 338A.

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Correct me if I'am wrong, but I don't think it's economically viable replacing those since I can't do that myself and will have to pay for the chips and the job to be done.

So let's just mark this as a "no fix" I guess :)

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Just a small update:

Bought a microscope today 🔬😂

And of course I immediately examined this board and right away was able to see someone's previous... hmm... repair attempt fail🤦‍♂️

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Waiting for a hot air station to arrive and then maybe I'll be able to fix this🤞

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@insympathy this "After a while battery gets insanely hot" would actually be more related to the battery then the charger. Your battery control board should cut of the charge before your battery gets to that point. I'd replace the battery first.

We would need to know what make and model your motherboard is. That way we could try to figure out what happend. It had to be major in order for all of those caps to be falsely connecting to ground.

https://www.youtube.com/watch?v=blv1MVYX...

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Hey, thanks for the hints!

I disconnected the battery and that didn’t change anything, so the problem is somewhere else I believe. Btw after disconnecting the battery the device kept draining around 1,5-1,6 amps.

As for the motherboard- it’s a “T100TA Main Board Rev 2.0”

完成的

I updated the question with some of my today's possible findings - hope that makes any sense :)

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