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Troubleshooting an old tablet that has power supply issues

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Quickinline

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Hi, I'm quite "new" to the world of electronics I have a CS background and I have a quite old tablet laying around that has power supply issues... it started randomly turning off so I used it with the charger plugged in for a while and now it doesn't turn on.
I managed to start disassembling and removed the battery... plugged in the charger. And unfortunately it doesn't turn on. Although it has an LED indicator that is turned on while charging (I assume it indicates that the board has power.
Any advice ?
 
Its possible the battery has a chip that 'knows' when the battery is at the end of its life and causing the issue, though I'd still expect a message of some kind.
 
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