Question about Dwin TransVision 3 Plus Multimedia Projector

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Picture becomes unstable after turning it on (lack of color,

Unclear, flashes). Turn it off and then start again in 5 minutes & is OK for about 10 min. & then problem occurs again. It used to stay OK for about 1 hour, but now it occurs on a shorter time span each time you restart it.

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The problem is with overheating!. after a few years the fans accumulate dust and "stuff" and don't work as well. Get a can of compressed air and blow out all the ports and fans. I take the cover off and with everything cool, I blow out all the internal fans also. The 3 big fans on the back are easy to remove and clean and get spinning again. Usually this fixes the issue for several months but eventually, professional cleaning may be needed at DWIN.

Posted on Dec 23, 2008

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Posted on Jan 02, 2017

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After the tv has been off for only a few minutes and you turn it back on the picture will flash on and off for 5-10 minutes and eventualy it stays on and works fine till you turn it off again.


Hmm, you have 2 possibilities that I can think of. First, if the picture color and brightness seem relatively normal, I would replace the CRT driver on the C board. This is attached to the back of the CRT via the pin socket. Second, if you notice a darker picture or faded color during the cycling period... things are not as rosy. This is a good indicator of a High GR (gas ratio) condition. Basically, your CRT is leaking.

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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.

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I think it can solve with this way:

Press Menu on the front panel of the monitor. Then press OK button and go down and go to COLOR : PRESET. Press OK and go down. Press IMAGE RESTORATION.

My E530 monitor is more clearly, now.

L.E.

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1 Answer

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I have the same problem. The only way to get the TV to come on is to unplug it, but once you get it back on it turns itself off again in a few minutes.

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the colorwheel is going bad and needs replacing. the colorwheel needs to spin fast enough to sync up with the dmd chip. if it cannot, the pic goes bad then off. the flashing is the colorwheel trying to catch up.

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1 Answer

Problem with color


Yes you have a problem in the red crt driver board. Most likely the driver transistor is failing. This is a component level repair, so if you have no experience with TV repair, play it safe and call in a trained tech to assist you in this matter. Good Luck

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