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.
Genuine Keyboard & Front Panel. Part. Repairs. Amazon Kindle Keyboard 3rd Gen
Amazon Kindle Keyboard 3rd Gen (parts only)
Battery For AMAZON 170-1032-01, Kindle 3G, Kindle Graphite, Kindle III
Replacement Tablet Battery for Amazon Kindle 7th Generation Kindle X Kindle 8
Battery For AMAZON 58-000187, Kindle Fire HD 10.1,Kindle Fire HD 10.1 7th
Battery For AMAZON 58-000226, Kindle 10th,Kindle 10th Gen 2019
