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Apple's March 2019 refresh of its iPad Air tablet, sporting an A12 Bionic processor and a 10.5" screen.

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What is the sensor TQ0B? (Not a typo, it is TQ0B, not TG0B)

I am getting crashes being caused by a panic due to thermalmonitord reporting a missing TQ0B sensor. I am not getting any joy at all from Apple.

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Hmmmm. I haven't actually seen TQ0B before. And now I'm curious. I Know iPads have a mess of sensors that are not as well documented. I have sen some in Display, but those are all tagged with TD if I recall correctly. Q isn't even giving me any hints.

Some extra info might be necessary for this one. This panic is the initial problem? Or has it undergone some repair already?

UPDATE: It’s possible based on a single reference to TQ0Q that it’s related to a charging or charger temperature sensor. I will have to have a look at the boardview when I get home because all the stuff I use for that only runs on Windows and the VM on my MacBook is broken. No schematics that I know of for the Air 3.

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No repairs at all. The crashes just started for no obvious reason...


@dmerrett Could still be battery? Or the battery connector. Battery sensors in iPhones end in B, just may be slightly different for iPad. There seems to be very little documentation (really no documentation) from Apple about their naming schemes for these sensors and iPad info is even more scarce in my experience.


@dmerrett In case you didn’t see my comment below to @dadibrokeit’s answer, I am going to pop it an abbreviated version into my answer.


Maybe it is the power connector, however it is moot now as Apple are going to replace the device. Thanks for the input. I really do wish that Apple would document what the bleeping sensors are and what they do. That way someone could fix it. The challenge is that it would probably need the mainboard to be replaced to repair the issue unless they would sell the chip/sensor separately.


@dmerrett You said a mouthful there. Apple actually doesn’t repair iPads at all, as you may now know, they only replace (at least for their customers, they certainly repair them internally). Even their tool for kernel panics from what I know is basically scans the device to see if there are any and spits out a yes or no. It doesn’t analyze them at all.

You may very well be correct that it’s part of the board. In which case, more than likely it may well be a part that’s accessible if you know where to look, and can be repaired if you are able to solder small surface mount components. But Apple certainly won’t sell them. It may also be part of the charge port assembly. Which is soldered to the board. And needs some know how to source.

But I’m invested in this mystery now. Glad you’re getting it sorted even though I’m shaking my fist at Apple.


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hi doug, if you download the panic log analyzer it may tell you what your issue could be, here is a link to download it.

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Hi Daniel, it did not detect any log files when there is a panic-full-2022-10-03-100625.000.ips file there. The issue is that the panic is caused, as I said above, by the thermalmonitord reporting a missing TQ0B sensor. I just want to know what that sensor is, I can read the ips file myself.


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Dang, I consider myself to be fairly expert at internet searches, but this one's got me stumped too.

Closest I came was this from PanicFull/Analytics/Error/ - GSM-Forum:


Originally Posted by simpleprince49

anyone fixed missing sensor TQ0Q? iphone 8 plus qualcom

Niki (m5500).

Searching for Niki m5500, it appears to be specific to the iPhone 8 as such:

M5500 for iphone 8 8G 4.7 Touch IC Niki SIP Boost Inductor Module Chip IC.

@flannelist, is this any help to you?

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@dadibrokeit YES! Actually that is super helpful. If that actually is the TQ0Q sensor in the iPhone 8, that would be the Charger NTC. Which is part of Niki. I don’t have schematics for the iPad Air 3, but I can try and see if I can hunt down something equivalent.

It’s also a bummer for the person in the original post from your quoted forum. This is only tangentially related, I just like making sure Apple knows that Niki was a colossally unintelligent idea of a chip.

Starting in the iPhone 7, they started putting a bunch of common inductors into a package together—stuff like backlight, speaker amp, and charging, that are similar-ish across all iPhones. Seems smart. Saves space. They call this chip M2800, Trinity.

But with iPhone 8, they put some additional stuff in here. Niki, in addition to these inductors, also contains the logic eeprom for the iPhone 8. So if the backlight inductor, or any other inductor blows, and Niki needs to be replaced, that makes it oodles harder to retain data on the phone.


Thanks for the info folks. I have no idea as to what the sensor is and actually neither does anyone at Apple I spoke to. The solution is a replacement iPad under warranty...


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