If you replaced Kindle Keyboard Screen ED060SC7(LF)C1 with not original (all new screens aren't original) then there is no Waveform data written on screens EEPROM chip. Kindle will reboot and load waveform from this chip.
DBYRPF Case for Kindle Keyboard (3rd Generation),Light Weight Slim Shockproof Kickstand Foldable PU Leather Cover Case for Amazon Kindle Keyboard (Kindle 3/D00901) 6" Display (Sky Blue)
DBYRPF Case for Kindle Keyboard (3rd Generation),Light Weight Slim Shockproof Kickstand Foldable PU Leather Cover Case for Amazon Kindle Keyboard (Kindle 3/D00901) 6" Display (Pink)
Huanghua Case for Amazon Kindle Keyboard (3rd Generation),Light Weight Slim Shockproof Leather Drop Protective Cover Case for Amazon Kindle Keyboard (Kindle 3/D00901) 6 Inch (Black)
DBYRPF Case for Kindle Keyboard (3rd Generation),Light Weight Slim Shockproof Kickstand Foldable PU Leather Cover Case for Amazon Kindle Keyboard (Kindle 3/D00901) 6" Display (Blue)
DBYRPF Case for Kindle Keyboard (3rd Generation),Light Weight Slim Shockproof Kickstand Foldable PU Leather Cover Case for Amazon Kindle Keyboard (Kindle 3/D00901) 6" Display (MGJ)
DBYRPF Case for Kindle Keyboard (3rd Generation),Light Weight Slim Shockproof Kickstand Foldable PU Leather Cover Case for Amazon Kindle Keyboard (Kindle 3/D00901) 6" Display (Brown)
