iPhone 6s short on PP_1V0_SMPS3 , do I inject 1 volt on this line
Hi all , , i've got an iphone 6s here which i was told had been water damaged , having taken it apart it has obviously had a repair attempted already as the shields were off and under fill dug away , the board looks relatively clean with no signs of corrosion there are however some components missing , i think whoever took the under fill off was a bit heavy handed , as FL3202-1 was missing , i believe this is a filter on the vcc main to camera .. am i right in thinking the phone should still boot without this ?
The phone will not boot nor is it seen by itunes
I have checked voltages around tristar , PP_VCC_MAIN is present, so is PP3V0_TRISTAR . and PP1V8 and PP5V0_USB , I replaced tristar to rule it out , still no change
My bench ps reads 15 ma draw which changes to 27 Ma when prompted to boot .. charger current reads 43 ma .
Nothing seemed to be getting warm on the board so i started checking randomly for shorted components , i found line PP_1V0_SMPS3 is shorted to ground , from what i can see there are only 3 components on this line and points under U_BB_RF ,
should i inject 1 v from my ps into this line to see what gets hot ?
Is this a good question?