SOURCE: Samsung DLP HLR5668W has mostly dark picture + grinding noise
Pix looks like a light pipe issue, inside the Light Engine. as far as the shutting down, could be a bad fan causing the grinding and when stopps the DMD turns the set off.
SOURCE: SAMSUNG PICTURE FREEZE (LOOKS BLACK&WHITE)
got mine working better unplugged the sound and wiggled the plastic coated wire above the large fan works but freezes maybe once in a day some days never have the sound running through the receiver (surround) I shut it off and it comes back on when it does freeze figure loose connection
SOURCE: Samsung HLR6167 - picture freezes
This is very common in Samsung DLPs. The DMD board is going bad. You will need to replace it.
SOURCE: TV shuts off every few minutes
The problem lies not with the manufacturer but with the technology. While DLP is one of the clearer, crisper rear projection technologies, it is still rear projection, and therefore the most unreliable of the TV technologies, LCDs being the most reliable and the least expensive to fix (relatively speaking). Projection TVs require that the lamp be changed every 2 years (with about 6 hours a day of use) but this can be as often as 6 months to a year for households that use the TV all day long. Lamps cost 150 to 200 dollars in most cases. Beside the lamp, the other parts in the TV can go as you have learned and they are not cheap to repair. I would recommend an LCD tv as they usually manifest problems in the first year (under warranty) if they are going to have any at all. No man-made technology is 100 percent, but I have to say that Samsung is an excellent brand, very high quality, and more features than the competitors. I own one myself (LCD) and have had it for over a year with not a single problem and it gets heavy use as I use it for HD cable, PC monitor, blu-ray, and Xbox 360.
To wrap things up, let me just say that were this problem to be fixed, being a projection TV you might run into these issues in another couple of years again. I would cut my losses and try an LCD (current generation plasmas are also good but they are super expensive to fix if they do break).
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