Question about Dwin TransVision 3 Plus Multimedia Projector

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Dwin lamp turns off

My Dwin transvision 3 is about 3 years old. After about 45 minutes the picture becomes unstable, flashes and gets unclear. If we turn it off, then on again, the picture is fine for a short time (about 2 minutes) (if the projector is started cold its fine for 45 minutes). Should I send it back to Dwin (the repair charge is approx $500!!) or can I fix it myself?

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Re: Dwin lamp turns off

I design and implement switching power supplies for the commercial lighting industry. I also own a DWiN Transvision and have opened it and worked on it several times. I believe I can answer this question.

The DWIN projectors use a proprietary switching power supply to strike the lamp and keep it burning. The power supply is extremely sophisticated and maintains tight voltage and current tolerances. This is important because the halides in the lamp are damaged by power supply fluctuations. The halides can often be seen in an unfired lamp, they appear as small specks of dirt or tiny beads inside the lamp envelope. When a metal halide lamp is struck, the halides (which are rare earth elements) vaporize and cling to the inner wall of the lamp envelope. The mixture of halide gas in the lamp is what determines the color temperature of the lamp, as well as the accuracy of the lamp across the entire color spectrum.

One of the ways that DWIN is able to deliver such great color is because they use a lamp which delivers this great color across the spectrum, but, as I pointed out earlier, can be damaged by fluctuations.

The power supply contains three switching sections and five references for such things as input and output voltage for each psu section, as well as overcurrent demands from the lamp.

From my experience, your lamp(s) are all exhibiting issues that require replacement.

Posted on Nov 27, 2008

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