Case:
iPhone 3gs fast drained batt and getting hot if it charge...
Cause:
Mainboard shorted
Solution:
Change Power Management IC...
Here's the way how to replace IC:
Preparing for reballing leads... I'm using heat resistant tape way of resoldering...
Mounting on solder plate...
Put solder paste (lead)...
Make sure lead paste must evenly distributed to holes...
Apply low heat and lead gradually melting...
After reballs from plate must reheat IC for even and fine lead settling...
Mounting to MB, heat must controled to prevent IC/MB spoiled...
Here's new IC mounted perfectly and beside is the shorted IC...
After assemble and plug in charge... It works but still lowbatt... (noticed at photo only 5 percent batt charged and the DATE when phone was dead)
Here's after how many minutes charge is 50 percent and for documentation compare IMEI on phone and the written IMEI on reciept and the problem written...
My first success change power IC is link
HERE last year...
And somebody copied
HERE...
BR