Why an iPhone don't charge or charge very slow?
My friend's iphone 4 had the screen cracked and send it to a local store for repair. After that, he noticed that his iPhone don't charge or sometimes charge very slow (10% in 4 hours) he checked with 4 different cables but the problem persist. There's no visible liquid damage in the dock connector. For finish I opened the iPhone and cleaned the dock connector ribbon cable socket with isopropyl alcohol, I let it to dry and the problem persist.