I have a Kindle 4th Generation, cheapest kindle series. The only problem I have with it is, lacking of backlight when reading in dark. Yes, I can pay $200 and buy a Paperwhite with backlight, but I don’t want to pay that much.
But it’s not a big deal:
- Coin type battery (CR2023 or similar) and its holder
- SPDT switch
- A piece of Veroboard
- Variable resistor (<570 ohms)
- White LED
- Soldering iron
- Soldering flux
- A clip to attach the board to the Kindle
Building process is simple if you know a little about electronics and done soldering before. Just serialize battery, SPDT switch, variable resistor, and the LED.