[英文]拆解Kindle 4

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[Part I & II 原文网址http://blogkindle.com/2011/09/kindle-4-disassembly-part-i/ ]

So my Keyboardless Kindle 4 (we can call it that since it is the first Kindle device to hit the market that features software 4.0) arrived late in the evening. Surely enough my curiosity got the better of me and armed with a screwdriver and tweezers I set out to take it apart and see what is inside.

Normally one would open a Kindle by prying the back cover off with something sharp and pointy (screwdriver or knife). Kindle 4 resisted my attempts to open it up and when I finally did I understood why – top and bottom latches are much stronger than the rest so you need to bend the center of the cover up to let them slide out. On top of that it turned out that back cover is glued to the internal battery cover with adhersive gel. You need to apply some force to pop it open. If you decide to repeat my steps – be warned that your warranty will definitely be voided. My Kindle 4 device bears clear signs of being opened. There is no way to do it gracefully. Clearly the K4 is not meant to be user-serviceable or serviceable period.

Popping the back cover off reveals battery and motherboard. Most of the interesting stuff is covered with metal and I’ll leave it at that for the time being. I don’t want to ruin the device until I play around with the software. But fear not – soon enough the mission will be complete and I’ll post pictures of bare motherboard even if I end up bricking the device.

kindle4-rfid-tag

Kindle-4-rfid-tag

On the back of the cover there is RFID tag manufactured by UPM. It reads “UPM + 253_1″. Perhaps it is used to automate the personalization process (Kindle comes to your doorstep already configured with your Amazon account. It turns out that Amazon started putting RFID tags inside Kindle 3 and I missed it during my last disassembly.

Kindle4-disassembly

kindle-4-disassembly

Internally Amazon uses T-6 screws rather than Philips like in Kindle 3.

Taking the cover off the LiPo (Lithium Polymer) battery reveals its specs:

  • Model No: MC-265360
  • Rating (Voltage): 3.7V
  • Battery capacity: 890mAh (3.29Wh) – this is almost half that of Kindle 3. And not surprisingly Kindle 4 claims half the battery life of Kindle 3 – one month. Which is still plenty
  • Made in China by NcNair
  • Part Number: 515-1058-01

Kindle4 battery

Kindle 4 battery

WiFi chipset is Atheros AR6103T-BM2D 26AR0620.142D PAF284.1B 1126 made in Taiwan. This is very interesting because doing a Google search for AR6103T returns zero results. Nothing. The chip is not mentioned on the net at all. It is clearly a part of AR6103 chip family but seems to be a newer modification. AR6103 chips feature:

  • 2.4GHz 802.11b, 802.11g and 1-stream 802.11n. This means that it can only put though up to 72.2 Mbps in the 802.11n mode.
  • WEP, WPA, WPA2 (TKIP and AES) and WAPI encryption
  • 802.11e, WMM and WMM-PS QoS
  • 8.3mm x 9.2mm LGA package

Kindle4 Atheros WiFi Chip

Kindle 4 Atheros WiFi Chip

Small chip between battery and buttons is Winbond W25Q40BVIG is 512 kilobyte Quad SPI flash with clock speed of 104MHz, 3V power rating and erase block sizes of 4K, 32K and 64K. It has been in manufacture since Q3 2009. It sits right on wires that go to eInk screen. Screen model is ED060CF(LF)T1 REN60B7075(C62)

Kindle 4-Winbond-flash-W25Q40BVI

Kindle 4-Winbond-flash-W25Q40BVI

There is quite a bit of free space around the battery that could have been used for one or some of the following:

  • Larger battery
  • Speakers or at least audio-codec and mini-jack headphone connector
  • 3G modem
  • Memory card (SD or MMC) reader

Perhaps Amazon will add some of these things in the future. Or perhaps they will leave this space empty forever to keep the weight and cost down.

If there is a serial console like in previous Kindle generations, it is not obvious or easily accessible.

 

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…

Kindle 4 motherboard

Kindle 4 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 128 megabyte  module  (Kindle 3 has 256 megabytes).

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.

Kindle 4 Motherboard components

Kindle 4 Motherboard components

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.

Kindle 4 Front Cover taken off

Kindle 4 Front Cover taken off

Here’s a picture of motherboard from the back.  Just buttons and some test points that have been taped over.

Kindle 4 Motherboard Back

Kindle 4 Motherboard Back

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 🙂

[完]

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本文网址:http://blog.rockstill.co.cc/433008

From: http://blog.rockstill.co.cc

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