Author Topic: EEVblog #1370 - Kindle Paperwhite REPAIR  (Read 2355 times)

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Online EEVblog

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EEVblog #1370 - Kindle Paperwhite REPAIR
« on: January 31, 2021, 11:13:15 pm »
Dave repairs his pesky Kindle Paperwhite with touch screen and charging issues.

 

Online Brumby

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Re: EEVblog #1370 - Kindle Paperwhite REPAIR
« Reply #1 on: February 02, 2021, 01:28:20 am »
Rule #1 - Check voltages.

Covers the battery, I think.   ;)
 

Offline Tek_TDS220

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Re: EEVblog #1370 - Kindle Paperwhite REPAIR
« Reply #2 on: February 02, 2021, 02:04:44 am »
Serial data lines have become common on batteries for laptops and other devices.  It's a good way to monitor battery health, temperatures, failure of individual cells, etc.  It would be nice if there were a standard software protocol.  This would eliminate any rationale device manufacturers have for not allowing any batteries other than their own.
 
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Offline engineer_in_shorts

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Re: EEVblog #1370 - Kindle Paperwhite REPAIR
« Reply #3 on: February 09, 2021, 03:07:43 pm »
Didn't you take apart the kindle years ago.......

..... yup just checked:
 

Offline Renate

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Re: EEVblog #1370 - Kindle Paperwhite REPAIR
« Reply #4 on: February 12, 2021, 12:48:53 pm »
I'm more of a Nook fan so it was interesting to see the Kindle teardown.
Did I see places for a standard SD card and a micro SD card?
Is there any access for a console UART?
It would have probably told you a lot of what it was doing when it was being balky.
 

Offline ChristianW

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Re: EEVblog #1370 - Kindle Paperwhite REPAIR
« Reply #5 on: February 15, 2021, 08:02:21 am »
I guess the I2C lines could be an SM Bus commonly used in smart batteries for the fuel gauge.
Protocols often follow the Smart Battery Specification - at least the first few registers should be the same... http://sbs-forum.org/specs/sbc110.pdf.
If it does have a fuel gauge, it could have "learnt" the charge and health status of the old battery, and so it is not strange that it reports a low stored charge until it has gone through at least one complete charge / discharge cycle.
 

Online EEVblog

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Re: EEVblog #1370 - Kindle Paperwhite REPAIR
« Reply #6 on: February 15, 2021, 08:14:46 am »
Didn't you take apart the kindle years ago.......

LOL, so I did.
 

Offline nctnico

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Re: EEVblog #1370 - Kindle Paperwhite REPAIR
« Reply #7 on: February 15, 2021, 01:35:15 pm »
Serial data lines have become common on batteries for laptops and other devices.  It's a good way to monitor battery health, temperatures, failure of individual cells, etc.  It would be nice if there were a standard software protocol.
Actually there is: https://en.wikipedia.org/wiki/Smart_Battery_System
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 


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