Kindle 4 Disassembly – Part II
When I opened up my new Kindle 4 a few days back I got the feeling that the device is not meant to be taken apart or be serviceable. Taking it apart further would have been destructive. So I waited for another copy of Kindle 4 to show up at my doorstep before proceeding further.
It turns out that I was right. Even the motherboard and battery are glued in. This means that there is nothing serviceable in the device. Display can’t be replaced, battery can’t be changed. Only repair possible is reflashing the OS.
So lets take a closer look at the motherboard…
Battery management chip is Freescale MC13813892AJ CQQD129D.
Power Management chip – Texas Instruments SN92009 A4 TI 18IG2 AOR5 G4. This is the same chip that is found in Kindle 3 and latest Kindle DX
CPU is MCIMX508CVK8B N78A 8TFC1130E. Which is:
- ARM Cortex-A8 CPU that can run at clock speeds up to 800 Mhz (an upgrade compared to 533Mhz of older Kindles)
- has 32 KB data and instruction caches, and 246KB L2 cache
- Vector floating point co-processor and NEON SIMD media accelerator
- Has built-in USB 2.0 controller
Memory is Hynix H5MS2G22AFR E3M 129A which is 256 megabyte module same as Kindle 3.
It is apparent that Amazon put a lot of effort in minimizing the cost to make this Kindle model an affordable one.
Flash is SanDisk SDIN502-2G
WiFi is Atheros AR6103T-BM2D 26AR0620.142D PAF284.1B 1126 (802.11b/g/n)
There is another chip which likely holds eInk controller firmware which is Winbond W25Q40BVIG 512 kilobyte flash chip.
eInk dislpay is ED060CF(LF)T1 REN60B7075(C62)
Battery is Lithium Polymer 890mAh. Don’t even think about replacing it. It is glued in tight and has only soft case around it so if you try to pry it off you risk ripping the cover and setting lithium on fire as it reacts with the oxygen in the air. It also has a custom connector to the motherboard.
It is possible that there is a serial console right above the CPU. However the contacts are very tiny. It is nothing like easily accessible serial console on Kindle 3 located in the cover hinge or Kindle 2 that was accessible by removing top part of the cover. To get to this console you will need to do some precise soldering. Here’s a copy of the image above with components clearly marked.
It is quite easy to peel off the front cover around the screen. It reveals button contacts along with a couple more screws that hold the motherboard.
Here’s a picture of motherboard from the back. Just buttons and some test points that have been taped over.
Pearl eInk screen is a thing of beauty and it still holds the image of Bellevue photobooth rental ad that was displayed as I powered the Kindle off to take it apart. It is glued solid to the aluminum frame of the Kindle. Trying to force it off caused back glass to crack. So while you can replace the motherboard, you can consider screen and battery to be part of the device frame.
As you can see, my cutting wasn’t of the gentle kind and I knocked off several small components off the motherboard. This Kindle became the victim of my curiosity :)