Applying heat to a cpu is not really a fix, but if it did make a difference, it is possible that that chip has failed.
Heating can sometimes temporaly restore the function of the IC which gives you an idea that it needs replacing
If that chip is infact the cpu, then I think your out luck
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Your batterg voltage is too low to boot the phone at 2V ish. It need to be at least 3.6V to 3.7V
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You.could plug in the charger and take a voltage reading at the battery connector to see of the voltage there is higher then the battery while the battery is plugged in. That would give you a clue if the motherboard is charging the battery or not.
Applying heat to a cpu is not really a fix, but if it did make a difference, it is possible that that chip has failed.
Heating can sometimes temporaly restore the function of the IC which gives you an idea that it needs replacing
If that chip is infact the cpu, then I think your out luck