iPhone 7 fast battery drain
Hello. I have an iPhone 7 which is having problems with a quick battery drain. The phone charges fine up to 100%. Phone draws .8 to 1 amp on the Ammeter. However, after leaving the phone unplugged overnight, the battery drains to almost 0%. On opening the phone, there does not appear to be any water damage. I used the TriStar tester and it passed the tester. I regardless decided to replace the Triatar IC. However, the phone continues to act the same way with normal charging but fast battery drain.
I think there is a partial short somewhere on PP1V8_sdram line. Diode mode reading on C3211 is .260 V. This is lower compared to a known good board which is about .311 V. Would this explain the fast battery drain and if so is there a good way to find a partial short on a component? Thanks.