IPhone 4s charge/power problem
 

Ok...so here goes...fixed a water damaged iPhone 4s a few days ago. Had to order some parts a it was stuck in permanent headphone audio mode.

Phone died after 3 or 4 days of being sat (switched on)

Plugged it in this morning and got the charge battery icon on the screen.....had a new screen to fit so decided to disconnect and test new screen using a direct power supply (as I usually do if I have a dead battery )

My power supply as soon as it was connected to the mother board has started ticking....showing no bolts...but the ammeter is ticking every second or so up to 1 amp and back to zero.

I'm guessing you guys are gonna tell me it's a U2 chip fault, but was wondering if anybody else had any other pearls of wisdom that may help.

Thanks in advance for any help.

Neil