iPhone SE 2020, restarting every 180s because of tg0b, board defect?

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iPhone SE 2020

Repair and disassembly information for the second-generation iPhone SE that was announced and released in April of 2020.

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benjemiah @benjemiah

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Postado: 26 de jul de 2022

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iPhone SE 2020, restarting every 180s because of tg0b, board defect?

Hello Guys, i need help. I have an iPhone SE 2020, replaced screen (by me) which is now kernel panicking and restarting every 180s (has nothing to do with the kernel panicking, screen replacement was done now a year ago). It has no obvious pry damage, the mosfet by the battery connector is still in place and not moveable. With both the OEM Battery and a new 3rd party one the kernel panic keeps happening as well as the 0% battery charge thing. In the logs "missing tg0b" is stated. When starting without the dock and front camera flex attached the logs state "missing tg0b and mic1", so i suppose its a board issue? Any tips?

The battery connector

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One of the data pins looks to be pushed into the plastic but I cannot be certain. The measurements you took are okay.

26 de jul de 2022 por Chris Stables

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One of the data pins looks to be pushed into the plastic but I cannot be certain. The measurements you took are okay. — Chris Stables

Chris Stables @imicrosoldering Rep: 50,7 mil 8 14 101 · Answer 1 · 2022-07-26T15:32:59-07:00

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Chris Stables @imicrosoldering

Rep: 50,7 mil

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14

101

Postado: 26 de jul de 2022

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This does sound like a battery data problem. The first thing to check would be the battery connector as they are known to be problematic on this model. Check the pins have not been pushed into the plastic, if they have you will need to pry them out. The next step would be measuring the pins with a multimeter in diode mode. Also there are two fetts near the battery connector not just one.

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i measured the pins and got the following readings: GND for GND and 418 for the 2 big pads on the other side as well as 689 for the data pins. Ill post in another comment a picture of the connector

26 de jul de 2022 por benjemiah

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Dhayalan Selvan @ds17 Rep: 1 4 · Answer 2 · 2022-07-26T06:06:52-07:00

Dhayalan Selvan @ds17

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Postado: 26 de jul de 2022

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Hi Benjemiah,

The error code refers to Temperature monitoring chip on the motherboard stopped working due to no feedback from the temperature sensor it has gone to fail safe mode (restart for every 3 mins)

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So it is not a Battery SWI Problem? How can it be fixed?

26 de jul de 2022 por benjemiah

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