I really need help here, please and thank you. Original problem, would not turn on.
Screen is fine, worked when i last used it and got a visible confirmation when working on it.
I then replaced the power supply board, no change and it acted odd when i plugged in the digital board.
Replaced the digital board, and it has made progress. I can now turn it on but the screen doesn't come on and it won't turn off without unplugging it.
Power supply is new, the main board is tested and warrantied.
Without digital board 5.2V measured as 5.25V and the 16V measured as 15.6V
With digital board 5.2V measured as 5.138V and the 16V measured as 18V