smilingdog
New member
Hi everyone,
I have an iPhone 6S that is giving me some problems.
When it first landed on my desk it came as not charging. I checked the basic stuff (USB flex, battery, etc.) and determined that since it was not even detecting the cable the Tristar must have been fried, so I replaced it.
After replacing the Tristar the phone was detecting cables but the following behaviour started occurring:
A: When the battery was <0% (black screen with battery sign, phone off) the phone was drawing around 450mA from the USB port and that current must have been used to charge the battery since after a few minutes the phone turned on.
B: As soon as the Apple logo appears the current drawn from the USB port drops to 0 but the phone continues to boot, once booted it displays the lightning logo next to the battery indicator (which is around 2-3%), so it detects the cable and it thinks the battery is charging, but that can not be true since the current draw is 0.
C: When the battery drops to 0%, A happens again, and this repeats, and this happens with a few batteries.
No components are missing from the board (at least I could not find any signs of damage).
I measured the following components and all tested OK.
R2400 measures 100R +/- 1%
C2400 is not shorted
R2311 measures 100R +/- 1%
R2320 measures 29K. This is the only one that is not spot on but it's only ~6% off, so I don't think it is causing this.
TIGRIS_ACTIVE_DIODE did not change when I plugged the cable in so I thought that maybe U2300 was fried, so I replaced it, but still, exactly the same behaviour.
I'm a bit lost right now. I wish I could get the datasheet for U2300 but I don't think it's available publicly.
Any thoughts?
Thanks,
smilingdog
I have an iPhone 6S that is giving me some problems.
When it first landed on my desk it came as not charging. I checked the basic stuff (USB flex, battery, etc.) and determined that since it was not even detecting the cable the Tristar must have been fried, so I replaced it.
After replacing the Tristar the phone was detecting cables but the following behaviour started occurring:
A: When the battery was <0% (black screen with battery sign, phone off) the phone was drawing around 450mA from the USB port and that current must have been used to charge the battery since after a few minutes the phone turned on.
B: As soon as the Apple logo appears the current drawn from the USB port drops to 0 but the phone continues to boot, once booted it displays the lightning logo next to the battery indicator (which is around 2-3%), so it detects the cable and it thinks the battery is charging, but that can not be true since the current draw is 0.
C: When the battery drops to 0%, A happens again, and this repeats, and this happens with a few batteries.
No components are missing from the board (at least I could not find any signs of damage).
I measured the following components and all tested OK.
R2400 measures 100R +/- 1%
C2400 is not shorted
R2311 measures 100R +/- 1%
R2320 measures 29K. This is the only one that is not spot on but it's only ~6% off, so I don't think it is causing this.
TIGRIS_ACTIVE_DIODE did not change when I plugged the cable in so I thought that maybe U2300 was fried, so I replaced it, but still, exactly the same behaviour.
I'm a bit lost right now. I wish I could get the datasheet for U2300 but I don't think it's available publicly.
Any thoughts?
Thanks,
smilingdog