Chosen Solution

the cpu is heating up, there is probably a short somewhere around the cpu or in the cpu itself. how can i measure components with a multimeter to see which of them is the problem. i read somewhere i can’t use a multimeter to check resistance because it will pass 9V and the components will fry is that true? if so then what should i measure for? thanks Update (11/02/2015)

here are some pictures. looks normal to me

Hellow Nadav, Image 1 - A8 SOC and Image 2 - Main PM IC on logic board. i guess heat produce from the PM IC. both chips were located at very closed upper and lower sides of the logic board hence you feel A8 get hot. Main PM IC doesn’t drive RF directly as ordinary phone so checking on RF AMP/drives short circuit doesn’t make sense to this case. (Question )Multi meter - Multimeter probes produce narrow current to measure components on ohms range but it never enough to fry your motherboard components and its not enough to do things that statistic electricity of your body to damage hi e-sensitive components on logic board. 9V battery is use to power up the multimetter and it will not produce 9V though the probes for any case. Reason the occurring these kind faults on apple devices if you use 3rd party / apple not certified charger to charge your device if the phone damaged by liquid Low quality wires connected externally (Damaged) lightning cable SOC, NAND Vbus 1.3V-1.8V short circuit Solution : This fault is every complicated to rectify and you may required hi-tech tool to monitor signaling. but can be recommended you to replace Main PM chip : (part number - Apple/Dialog 338S1251) it required high level BGA reworking skills to replace the chip. (Not expensive chip :-) you can order via eBay or amazon ) PM chip replacement was hard but some moved capacitor fixing was harder than Chip replacement. anyway fault is repairable.

Nadav if you want to test the CPU supplies from the power management without blindly pulling random ICs the you should isolate the line via the inductor coils on the H7 buck rails as they are high ampere rails. Its not uncommon for for say a shorted cap to cause the CPU to heat. Isolate all faults by removing the inductors this will tell you if it is a supply or demand issue

Hello iphone 6 working phone Display broken I have replace But unfortunately shop boy was pressed Fingerprint pin different pin pressed Then there is no image shown in display After I press home button + power button Phone turn on but no light After removed the logic board from body Pmic is heat but no logo found Before the logo shown but no light I check it’s shows some short circuit but which idont have idea Please help