Posted on 2 Comments

Roku LT Teardown

 

Roku LT
Roku LT

Here’s another retired piece of tech that we used to route media from the NAS to the main TV. It was retired since it’s inability to support XBMC/Kodi & having some crashing issues.

Main PCB
Main PCB

After attacking the case with the screwdriver (Torx in this case), the main board comes out. The CPU in this looks *very* familiar, being a PoP device. There are unpopulated places for an ethernet interface & USB port here.

Flash & CPU
Flash & CPU

After a little digging is turns out the CPU in this device is a BCM2835, with 256MB of RAM stacked on top. It’s a Raspberry Pi! Even the unpopulated part for Ethernet is the same SMSC LAN9512!
There’s 32MB of Flash for the software below the CPU.
On the far right of the board is a Broadcom BCM59002IML Mobile Power Management IC.

WiFi Chipset
WiFi Chipset

On the bottom of the PCB is the WiFi chipset, a Broadcom BCM4336, this most likely communicates with the CPU via SDIO. There’s also a section below for a Bluetooth chipset.

 

Posted on Leave a comment

Sigma Mini Keychain LCD Photoframe

Front
Front

This is a cheap Sigma branded keychain photoframe. User buttons for power & selecting photos are on the left.
There are two white LEDs on the bottom edge that function as a torch as well.

Display
Display

Front of the unit removed, showing the LCD module. The USB jack is bottom left, next to the pair of white LEDs & above that is the 32kHz watch crystal that the CPU uses for timekeeping.

Back Removed
Back Removed

Here the back has been removed showing the 3.7v Li-Ion cell used to provide power.

Display Folded Back
Display Folded Back

Here the display has been removed from the PCB exposing the chipset.

Chipset
Chipset

Here the CPU blob-top chip & a flash memory IC are visible. The CPU is a Sitronix ST2205U.

Posted on Leave a comment

Garmin eTrex

Front
Front

Pocket sized GPS navigator. Here is shown the greyscale dot matrix LCD.

Interface
Interface

Serial interface on the back of the unit. Pinout from left is +3v, Rx, Tx, GND.

PCB Back
PCB Back

PCB Removed from the casing. RTC backup battery in the centre of board, CPU & flash ROM on the left. GPS chipset is under the shield on the right.

PCB Front
PCB Front

Front of the PCB, GPS antenna on the right, LCD panel left.

LCD Removed
LCD Removed

LCD folded back from the PCB. Driver IC can be seen attached to the ribbon.

Electroluminescent Panel
Electroluminescent Panel

LCD Panel backlight. Requires 200v AC at 20kHz to glow green.

GPS Reciever
GPS Reciever

GPS chipset with the shield removed.