Not charging after most things being replaced on charging circuit
Hi.
I have an iPhone SE that came to me with a battery percentage error and not charging. The phone would recognise the lightning cable being connected but would not pull any amps.
The first thing I did was check the battery terminal when the lightning cable was plugged in to see what the charging voltage was and verify Tristar and Tigris was working. This was showing 0.9V, so i replaced Tristar and the voltage came up to 3.9V on the same test. But hence when the battery was connected, this voltage would drop to battery voltage eg 3.4V. I also noticed FL2400 was missing at this point and replaced it, (I assume this is why my % was incorrect), but still not charging.
So to keep this short, I've replaced most things on the charging circuit, checked for shorts, checked all resistances and i still can't get it to charge (battery, dock, tigris, Q2300 etc). All my voltages look fine but it just won't 'open the floodgates' for my amps to flow to the battery. My observations with the ammeter connected are it would fluctuate between 0.1-0.45A when the screen is on, but as soon as the screen goes to sleep, it drops to 0.0A.
About to send it back as a no fix, but thought I'd ask on here first in case someone has had a similar problem.
Any help would be appreciated, thanks, Sean.
Is this a good question?
2 Comments
any damage near l4001_rf or u_qpoet_rf as pp_batt_vcc is round that area
by daniel
Not something I've looked at but it's certainly worth a check. Thank you for your feedback.
by Sean