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I just acquired an Optoma EP771 (refurbished from Amazon). There is a persistent white vertical white light flickering band that I do not know how to get rid of, I have reset to defaults and I have also tried changing frequency and tracking but to no avail. I tried the projector with two different computers--one with vista and the other XP--same problem. Can you give me some advice?

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  • Master
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Hi,

with the indulgence of Ginko, may I offer alternatives to the cable replacement...

Try using another manner of injecting the PC's video signal into the projector other than what normally is used. If you are using now DVI, then use standard VGA, S-Video or even composite R-G-B or the plain yellow RCA Video IN if available from your PC and likewise with the Optoma EP771.

To my knowledge, white line(s) is a result of oscillation or signal bleedover of some sort in the video signal path (which includes the cable as Ginko has suggested). It is also possible of noise feeding back to the video processor/amplifier. Most can be corrected by additional shielding and/or putting capacitors in inputs or outputs pin (to the ground), but this has to be a case of winging it and requires a pretty good knowledge of RF and digital electronics components and circuitry.

If you are using a laptop (and even a desktop) try putting some distance between the PC and the projector. In some instances, using a common power strip with polarized plugs also helps. Some electronic lamps have also been known to cause some sort of interference as well as other electrical devices (including a genset).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Apr 26, 2008

  • Louie  Role
    Louie Role Apr 27, 2008

    Have you tried lowering the Screen Refresh Rate of either PC (XP & Vista)? Additionally, you can perhaps lower likewise the Screen Resolution (just to verify that they are not causing the white lines).

    Being refurbished, the options are rather limited not unless Amazon provide some sort of warranty on the item. Perhaps you could also discuss your concern with them.

    Cheers and my compliments to Ginko.

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  • Master
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Try replacing the cable

Posted on Apr 26, 2008

  • Ginko
    Ginko Apr 26, 2008

    Often a defective cable can create lines, and similar phoenomena. Try first moving the cable and eventually replacing it.
    Check also if there are devices that may create inteference, for example power adapters very near to the cable.
    If it nsot the cable inspect the lens, and the inside of projector. A dirty lens or a defective lamp can create same problem.
    If it is none of the above, then it is a fault on the projector board , probably on input near side.
    If I was in your shoes, by the way, unless it is the cable, I would try returning the projector to seller.
    Suppose that is the lens, and it is one lens split in two , as soon as you disassemble the lens you will be blamed for the fault, best thing is contacting seller first

  • Ginko
    Ginko Apr 26, 2008

    Benimur may be right, but the fact is that if the projector is new, and for example works well only on Svideo and not on other inputs then it is faulty the same, and you won't be able to use full capabilities.
    You can also try troubleshooting online with Optoma, using
    Tech
    support online form.

    I think you will get same solutions, but it is always worth contacting manufacturer.

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