HDLP61W151 61 in Takes sometimes hours to turn on

[RCAJay]

HDLP61W151 61 in Scenium, never takes less than 15 minutes then sometimes takes hours of being left on to actually produce a screen. Once on it has no problems and will stay operating for hours on end. Replaced the bulb about a year ago with an osram bulb. worked fine for about a year then this is began. Bulb lights up and i can hear the wheel start spinning. No unusual sounds coming from the wheel. Any ideas?

[Eddie]

Osram bulbs are bogus. It might also be the ballast or power supply.