56HM195 DLP Clunking noise dim/bright issue

Got an old 56HM195 that I inherited, been running good until the other day it started making a clunking noise. The picture dims and brights alternately with each 'clunk'. The bit of lamp I can see shining thru the rear of the housing appears steady. So the dimming is in the mechanism, perhaps? I can hear a fan running. The vents aren't too dusty. I pulled the lamp, visually it looks good. It is an OEM type I put in back in 2012, not one of the cheapos. The picture has been slowly dimming with age (gets a lot of use) and I knew I was headed for a new lamp eventually, however the clanking/dimming has me stumped, especially when from the rear peeking in the cracks the lamp light appears to be steady up to a certain area, I'm assuming past the light engine, then you see the flashing. The clunking/flashing isn't quite per second but is is close to that and very regular, not intermittent or variable. The picture is otherwise flawless, I have no static, no spots, no green/blue areas, the colors are as they should be as far as I see.
When I'm not turning it on or off, and it's just sitting there flashing the screen bright/dim and clunking, IIRC the led lights don't show any errors.
When I turn the television back off, the clanking continues until the set reaches the end of its cooldown cycle, at which time it quits making the noise.
Fan going bad? Light engine crapping out? Is it really just the lamp? Reluctant to buy a cheap lamp, but also reluctant to buy a full-priced one when I'm not sure that is the fix. Any ideas? If no one replies I'll be tempted to do dirt cheap lamp knowing it's a piece of junk, on the off chance it is a lamp issue, then I'll go from there. With Wally selling comparably-sized flat screens in the $400 range now I'm not going to pour tons of money in this but I don't mind feeding it lamps every three or four years, either.

Thanks for the links. Yes, I've tried everything, and so did a Genius at the  Store today. He took it in the back, then came out, saying that he thinks it's a logic board problem. He told me that he had hit the button to turn it on, and that it had not responded immediately, but came on a few moments later. Despite my best efforts, I have not been able to replicate this behavior. He said he really didn't know much more about it, and that he wished he could, but he was "bound by 's rules" on the matter and had to send me along with the out-of-warranty line. So I'm heading to a 3rd-party guy in the next day or to, and I'm gonna let him run some diagnostics on it.
I don't know what he was talking about with the turning on thing, but it seems to turn on just fine for me–and I've pushed that button all night now.
Hopefully the second opinion will cast some light onto this issue.

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56HM195 DLP Clunking noise dim/bright issue

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