I think I'm having this issue w/ my HLN617W. Turned it on last night and it played for 20min or so, then the screen went blank. Unplugged it for a few seconds, and it came back on for a couple of minutes. Unplugged it and waited 5-10min, and it was good for another 20min or so.
I suspect it's not the bulb. I replaced that about a year ago. Pic looks fine while it's on, I didn't hear a 'pop' like I have before when the bulb goes out, and I don't have any noises (I had the color wheel replaced once, so I know what that sounds like).
I'll get in there tonight and pull the bulb and vacuum out any dust in there, but I'm thinking it could be a failed fan causing the set to overheat and shut down. Any way I can confirm this? Any other thoughts as to what it could be? I've seen some posts above mention a ballast, but I'm not sure what's involved in replacing that.
I already have a new set on order (PN64D7000), but would like to move this one up to the family's summer house if it's not too much to fix.