LG monitor keeps turning off

[danielfsl2011]

My LG monitor kept turning off immediatly after getting signal from my PC, however power light stayed on and a few minutes after "warming up" it would stay on for a while.
I was told it was bad capacitors so I ended up replacing the whole PCB, however it still keeps happening.
Did I buy a bad PCB? Or are there more causes to this that may be fixable?

I really dont want to buy a new monitor, but if I have to...

Brand: LG
Model: Flatron 22EA53VQ-P

Its a 4 year old monitor (+/-)

 

[CountMike]

Sounds like back light is shutting down. To check for that, take a flashlight and shine at the screen on an angle, you should see some of the picture like that.