Fake charging - I give up :(
Hi all
I have an iPhone 6 Plus that I’m battling with (and losing badly), that has a charging issue. The phone recognises the charger and shows the charging symbol, but the battery does not charge and battery % does not change. The amp meter shows quite an unstable amp reading constantly changing and ranging from 0.25amps to 0.6amps. When the screen goes to standby/inactive the reading drops to almost zero amps.
I have all the correct diode readings on the dock connecter. I get 3v on PP3V0 Tristar. When I connect a charger with no battery connected I get between 3.8v to 4.2v on PP_BATT_VCC. I’ve tried the board with a known good charging port and battery, unfortunately I still have the same issue.
I started with replacing Tristar/U1700 as I find this solves the issue in the vast majority of cases, however not this one sadly :(, I’ve also replaced Tigris/U1401 and Q1701, however I still have the same issue.
Here’s the interesting part, I decided to replace the MOSFET Q1403, before doing so I bridged PP_BATT_VCC & PP_VCC_MAIN (with Q1403 removed). This solved the problem, the battery charges normally and the amp meter shows a more constant 0.8amps whether the screen is active or not. I thought I’d cracked it at this point and replaced Q1403 with a new one (well from a donor board). Unfortunately the same issue came back with the replacement of Q1403.
I’m completely baffled now, any ideas anyone? I will be greatful of any thoughts as always :)
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5 Комментариев
Does 3utools show battery data?
из Chris Stables
Just thinking on top.of my head, but I'm just curious to know if you have concidered the PMIC?
из Innovatrix Repairs
@imicrosoldering
Hi Chris, I think you're on to something! 3Utools doesn't show battery data. You've put me on the right track, after researching this a little I've now downloaded the iDevice Panic Log software, this suggests the issue maybe with the vibe driver or BATTERY_SWI line. I've now replaced U1400 but unfortunately I still have the same issue. I'm now focusing on the BATTERY_SWI line, I've noticed there is a 'Filter' on this line FL2511, however the strange thing is I don't get continuity across this but I also don't on a known good board, I also get the same diode readings 0.595 & 0.495 on each side of the 'filter' which is the same as a known good board, but not continuity. I've seen some fixes using jumpers and resistors under Tigris?
из Darren
@innovatrix Hi, thanks for your input, I haven't considered PMIC so far, but now I seem to have tried everything maybe it could be something to do with PMIC. I really don't think I'm minded to replace PMIC to find out, as it's not really worth the repair.
из Darren
@imicrosoldering My curiousity always gets the better of me in these situations, I should know when to give up from a time/value perspective lol, anyway I've now gone ahead and tried both of the Tigris/U1401 jumper/resistor options I can find. One by running a jumper from pin G1 to a 2.2k resistor, connecting the other side of the resistor to ground, then a second resistor on the same jumper, connected to G1 with the other side connected to VCC main. I can't explain why I've tried this other than I seen someone do it on Youtube lol. I've tried a second jumper from FL2511 (BATTERY_SWI_CONN) to a 2.2k resistor with the other side connected to PP3V0_TRISTAR - neither of these have made any difference :o
из Darren