Question about Optoma EP719 XGA DLP PROJECTOR 2000L 2500:1 CONT DVI-D WITH HDCP Multimedia Projector

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Follow up on the Optima 719 with vertical white line

I read another post on another website. The writer had the same problem. He mentioned that he believed the color wheel had gotten out of balance. (I have no idea if he even knows what he talking about). He had tapped his machine and then no white line. I remembered that when I had started the projector the last time there was no white line. Then someone wanted the projector tipped up more that the front post would allow and put a book under the front of the projector. Soon we had a white line. Don't know if this was coincidence or not. I set up my machine yesterday on a level surface (without elevating the front post). It still had the white line. I tapped the machine lightly and the line went away and did not come back during the next 45 minutes of use. I don't believe it is "fixed" but wonder about main board failure if a tap could "fix" the problem. Any further ideas? Could there be a loose connection? Years ago we were having trouble with our vertical hold on our TV. It was under warrantee and the repairman told us that that particular model had a problem with some poor solder connections. He soldered a few and tested all and they worked. About 6 months later, the same problem. He came out again and soldered the rest of the connections. The TV has not given us any problem since. I know others have complained about this problem. Has Optoma looked into this that you know of? Anyway, thanks for your quick response and help.

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  • Abouttime May 26, 2008

    I wasn't disputing you... Just wondering how a failure of a mother board could change when tapped? I used it again today. I set it up, ran it for 40 minutes and saw no problems... never tapped it. Strange.

  • Abouttime May 26, 2008

    I am just a LITTLE slow... I think I understand now. When you said the problem was with the mother board, you were saying that the only sure solution was replacement of the mother board because the engineers have never identified a specific component that is failing. Thus, if you want a permanent fix, you must replace the entire board. Now your answer makes more sense to me. Thanks!


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Hi Abouttime

Tapping can fix most electrical things for a very short while - unexplainable !

But I have been working as a authorised service provider on mos brands of Projectors for over three years now and in all of the times the white line was a faulty Mainboard.

This is just my opinion and I only answer and provide a free service to those who are in need.

Wheter you take my advice or not is entirely up to you.

Kind Regards


Posted on May 26, 2008

  • Marnus Jacobs
    Marnus Jacobs May 26, 2008

    Hi there

    You will see over time that this problem will pop up intermittently.

    I've had cases where it only showed if the Projector was mounted upside down to the ceiling at a certain angle.

    Like I said - Unexplainable !

    I work very close with BenQ Corp. and not even their Service Engineers in the factories where these parts are designed and produced could give me a logical explaination to this.


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