I HAVE A PIONEER PDP-505HD. AFTER ABOUT 30 MINUTES, IGET A PROGRESSIVLY WORSE RED BURST IN THE TOP MID PORTION OF THE DISPLAY. IF I PUT A FAN ON THE BURST IT WILL EVENTUALLY WEAKEN. I HAD A NEW POWER SUPPLY INSTALLED, BUT STILL HAVE THE RED BURST.I WAS TOLD SOME ADJUSTMENTS MIGHT BE NEEDED. ANY IDEAS AS TO WHAT ADJUSTMENT IT COULD BE? THANKS MIKE