crwdns2936637:0crwdne2936637:0 crwdns2853008:0crwdne2853008:0 crwdns2918746:0crwdne2918746:0

Repair information and guides for the iPhone 6S released by Apple on September 25, 2015. Models: A1688, A1633

crwdns2934591:020crwdne2934591:0 crwdns2934593:0crwdne2934593:0 | crwdns2947278:065crwdne2947278:0 crwdns2947270:0crwdne2947270:0

crwdns2933897:0crwdne2933897:0

Why missing battery sensor on OEM replacement?

Today I bought a fully functional iPhone 6s (never opened) to maintain another identical fully functional iPhone 6s (except storage capacity).

After replacing the battery by the (in fact genuine OEM!) donor battery, it restarted every 3 minutes.

Panic logs unveiled missing sensor TG0B (battery): iPhone Keeps Restarting

Returning to the currrent worn out battery* resolves this issue.

This is nuts. ^^ Couldn't find any question/issue/answer alike.

*Current battery is a 3rd party from a local repair shop that never caused any issues but lasts only 2-3 hours being 3 years old. Before this one there was an iFixit battery which lasted the same being 2 years old only.

Reference to question/answers on german board: https://en.ifixit.com/Antworten/Ansehen/...

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0

crwdns2933315:02crwdne2933315:0

crwdns2934221:0crwdne2934221:0
crwdns2931211:0crwdne2931211:0 crwdns2931215:0crwdne2931215:0 crwdns2934225:0crwdne2934225:0

crwdns2933897:0crwdne2933897:0

see https://repair.wiki/w/How_To_Fix_an_iPho... This explains the troubleshooting steps for a TG0B (battery) error in great detail

for iPhone 6s motherboard pinouts and diode mode readings read further HERE

crwdns2934105:0crwdne2934105:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0

crwdns2944067:02crwdne2944067:0:

It appears to me from the question that the issue seems to be definitively with the battery and not the motherboard.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

Thanks a lot for taking a closer look!

It seems this troubleshooter on TG0B refers to iPhone X and the relevant aspects do not apply to iPhone 6s. This model has neither MOSFETs Q3200 and Q3201 nor mentioned data pins - correct me if I'm wrong: https://electronics.stackexchange.com/qu...

Anyway, both iPhone 6s and all it's parts show absolutely no sign of damage/corrosion to any circuits, connectors, resistors, transistors, etc. though I don't have a multimeter with me to "prove".

The closer I look into it, the weirder it gets. :'D

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0

crwdns2933897:0crwdne2933897:0

Just to clarify, you bought another iPhone 6S, took the battery from it and put it in your own iPhone 6S, right? And the donor battery causes a boot loop in your current phone.

Question: does the donor phone also boot loop with that same battery?

If so, it's just plain a failed battery and you'll have to locate another replacement. Otherwise that's a new one on us. The only thing I can think of would be software; if the donor phone is running a newer version of iOS, it may have updated drivers that can handle a change in the battery communication protocol; that battery may be newer and require an OS update on your phone. That's all I can think of if it works fine in the spare phone but not yours.

Oh yeah, you might verify that your phones have the same model number; any chance you might have gotten a 6 instead of a 6S?

crwdns2934105:0crwdne2934105:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0

crwdns2947414:01crwdne2947414:0:

1. Yes.

2. No, the donor iPhone 6s is fully functional.

3. Logs checked and tested before (genuine 1st) opening.

4. Both iPhone 6s have exactly the same version of iOS 15.8.4 (19H390).

5. Both iPhone 6s have no signs of any corrosion, water damage or alike. The worst I can imagine is past heat/sun exposure as the screen's adhesive strip looks a bit yellowish and dried out already.

6. Interestingly transferring various other parts is fine: iPhone 6s Lightning Connector Assembly Replacement, iPhone 6s Wi-Fi Diversity Antenna Replacement and even screen including front-facing camera + sensors, earpiece speaker and home button*. There is literally not much left to transfer: cellular antenna, rear camera, general speaker, taptic engine

7. Of course I did - both are A1688. Interestingly logs of both iPhone 6s show "Hardware Model: iPhone8,1"

*Ofc without Touch-ID which is well-known. Also I figured that double-tap (not double-click) does not trigger reachability mode for one-hand-use although it actually should.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0

crwdns2934229:0crwdne2934229:0

p`IRF~A&csML6_5yF&FB crwdns2934231:0crwdne2934231:0
crwdns2936625:0crwdne2936625:0:

crwdns2936751:024crwdne2936751:0 19

crwdns2936753:07crwdne2936753:0 19

crwdns2936753:030crwdne2936753:0 19

crwdns2942667:0crwdne2942667:0 19