I have replied to an older post but it was over 8 months ago so I thought best make a new topic, so I have a Nintendo switch here that goes black after the first Nintendo logo.
I have replaced the M92T36 chip and checked pin 5/6 both are showing 3.3v when on charge.
I have also replaced the BQ24193 chip and I still have the same issue.
I have also replaced the Zif connector for the LCD and have checked the connections and it is fine (Nintendo logo briefly shows before a black screen)
I have checked the battery voltage and it does go up while on charge so this really has me stumped, does anyone else have any information that might be useful, I cannot find any shorts to ground on the board.