Aporte original por: Minho ,
Then this will be your big chance ;>)... Because you have already ruled out all of the modular components but don't really have any other leads, I like to recommend that you start at the beginning. Do you have access to a [https://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=usb+ammeter|USB Ammeter]? This will allow you to see if the phone is drawing any current. Always start with the main voltage rails...PP_BATT_VCC & PP_VCC_MAIN. Check to see if they are shorted first (with battery disconnected) and then check the voltages under power. If those look good, move onto the PMIC (U1202) and start testing the voltage rails it produces. You should also do a thorough visual inspection to see of anything is obviously wrong. So start probing and then report back with your findings so that I can give you more detailed suggestions.