My 50” Samsung DLP (model HLN5065W1X) has 2 issues: 1. picture sometimes does not come on When starting up, the warm up lamp is on. Should take less than 30 seconds to come on. Sometimes takes minutes, sometimes comes on right away and sometimes (more frequently now) does not come. When I bump it, it comes on. Wonder if loose wire or solder joint…??? 2. Skips in analog mode or DVD or VCR. From time to time, it skips, appears tv not synching properly. TV is probably 4-5 years old

SOURCE: HDTV Rear Projection

The color wheel is the most common problem when it comes to noise from DLP's. To determine if it is a color wheel or fan: Turn on the set. When the noise starts, turn off the set. If the noise goes away within 5 seconds, then the color wheel is bad. If the noise goes away after one to one and a half minutes after the set was shut off, then one of the fans are making the noise.

SOURCE: Why does my Samsung DLP tv turn off by itself,

Either the lamp is aging or the vents are blocked causing the thermal sensor to over heat.

SOURCE: White dots appearing on Samsung TV screen and multipling each day

It seems you might have an issue with the dmd board. Go to the menu, and if the dots still show on the menu, the issue definitely is with the dmd board but if they don't come up on the menu, the issue will be with the video board.

SOURCE: vertical black lines on my 50" Samsung DLP TV

You need to replace the digital board

SOURCE: Own a Samsung DLP TV 42 inch and white dots have

The random whit dots you are seeing is more than not the DMD or million little mirrors board. The white spots represent some of the mirrors that are sticking in the on position. In that case they are always reflecting white light from the lamp. I don't concider the DMD board a do it yourself repair since on the older DLP set it requires mechanical alignment as well. The best thing to do is contact a techincian and see what they might charge to repair the TV for you. Please take a few moments to rate my answer...Thanks..