Author Topic: Amazon Fire HD10 - Inductor?  (Read 219 times)

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Offline andrew_cTopic starter

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Amazon Fire HD10 - Inductor?
« on: November 16, 2024, 08:53:40 pm »
I have an Amazon Fire HD10 (2019) that won't charge. Outlet shows the tablet is pulling 2.5A, with or without the battery connected to the motherboard.

I have identified an inductor that is getting uncomfortably hot and has scorched the board. I feel like the inductor is just a symptom and not the cause. I've no FLIR camera, just alcohol. Tried to identify if a cap was shorted and getting hot - couldn't see anything outside of the shielding.

Great tablet, which I would hate to go to e-waste.

 

Offline MathWizard

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Re: Amazon Fire HD10 - Inductor?
« Reply #1 on: November 18, 2024, 10:13:41 am »
So it's a tablet, with say a 12V or 5V wall-jack PSU ? What voltage is the battery ? IDK if anything on these would need a DC-DC step-up/boost converter, but there's probably a few DC-DC step-down/buck converters. Sometimes they have them in series on the input voltage too. They should be very low DC resistance, and not heat up much, even with a lot of current.

Do you know what circuit the inductor is part of ? Is it the black thing in the pic above the REV1 ? Or is that just another part with a bit of dirt of blackening around it ?

If it's part of a converter circuit, there should be a controller IC and diode or 2 and some mosfet, very very close to the inductor.

In general these PCB's, are a nightmare, because they have so many layers, traces disappear under all kinds of chips too, and then soldering on them and even just probing on them can be hard. And then a lot of the chips probably won't have public datasheets, and they might not have a label, or anything a search engine can find.

If you are a lucky, it is just a power type issue, and has nothing or little to do with any chips, or operating systems, besides some power controller IC, or MCU.
 


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