Power Button Not Working, Tried replacing the Power/Vol+- Flex, Ribbon Cable and Joy-Con Daughter Board

Hi All, hoping someone can help steer me in the right direction with this Switch Lite,

Powers on when i plug in the charger but cant put it to sleep or power it on or off with the power button, i opened the system and started replacing parts, first off i replaced the power button flex board which didn’t help, then tried the ribbon cable connecting the Left Joy-Con daughter board to the main board then replaced the actual daughter board, all three things haven’t made a difference so i’m assuming its something on the main board itself but i dont know where to start looking, i’m hoping someone else here has experienced such as issue and can point me to the culprit or where i can start proding with the multimeter

Thanks in advance!