Phillips 42 inch projection 4 years old start-up blank screen

Had no picture...thru the internet, I had the main board repaired and just re-installed it!!!

At Start-up everything good, except no screen to view setup etc...Turn the TV off, and you see the screen for a flash, with whatever you were doing, camera, setup, a channal, etc...
A new remote from Phillips I puchased works the TV!!!
It is like the TV is in sleep or locked mode???

Anyone had this situation and a fix???

Sincerely,
ozone1