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I had a shot capacitor on my BenQ PB6200 multimedia projector. Because of that, I had no rear fans, and no bulb, and an internal fan would not power down. I used this site to suggest a bad capacitor, and found the bad capacitor and soldered in a new one. (described in http://www.fixya.com/support/t364731-benq_pb6100_light_bulb_not_power_ok) From that point, I thought it was fixed, but after re-installing it on the ceiling, I realized that I have nothing but a white screen. No image from the projector's UI or any input. So it looks like something else is shot. Anyone have any ideas, or where should I send it to repair?

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  • mailbag267 Sep 07, 2010

    Nope. It's all plugged in. That was the first thing i re-checked. What's more, there is precedent for this. Other people on this site and another had the same sequence of events: blown power supply capacitor, fix, white screen.

  • mailbag267 Sep 08, 2010

    I think my shot capacitor is a fairly common problem on this model. Also, low-quality capacitors are known to bulge, leak, and fail. It is actually because of corporate espionage gone bad and is on Wikipedia as "capacitor plague":
    http://en.wikipedia.org/wiki/Capacitor_p...

    So, if my mainboard has been affected, where would be the best place to send this to have it fixed from California?

    Thanks for all the ongoing help.

  • mailbag267 Sep 08, 2010

    Hi. I suppose I will look into sending it for repair.


    I am in 94588, Pleasanton, CA. Any suggestions for good repair shops?


    thanks.

  • mailbag267 Sep 08, 2010

    Hi.


    That sounds correct. So, if I were to try to repair it myself, where would I go to buy a mainboard, and which part should it get?


    I'll have to do a cost comparison of fixing it myself, or sending it in.


    Thanks a lot.

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  • 12,061 Answers

You will find your power supply is faulty, you only fixed the damage you haven't fixed the "Cause" this is a common trap, for inexperienced people, you see all electronic problems usually have two facets to them, the Cause of the problem and the damage done by that cause.

Say in the case of a bad capacitor, well the capacitor may well be faulty, but WHY, components usually do not self destruct, no, they must have some external influence working upon them to cause them to fail. Here is a senario, the capacitor is faulty, the reason the capacitor is faulty, is because a Diode in the Power Supply, has partially short circuited, and is allowing AC ripple current to flow through the capacitor as well as the pure DC, now capacitors HATE AC, it damages them, and they soon fail. Now if we only replaced that faulty capacitor, then the bad Diode will surekly destroy it again conversly, if we find the faulty Diode, and only replace that then before long the already damaged capacitor will eventually fail. So as you can see we must find, any damage and the "Cause" of the damage before we can say anything is fixed.


Now before one can do anything one MUST get a service manual, I have included the link for download below. use this to troubleshoot you issue.


http://www.eserviceinfo.com/downloadsm/16426/BenQ_6100/6200.html

Posted on Sep 09, 2010

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White image = DMD non-operational  = image processor dead - it can't be fixed, the entire mainboard must be replaced.
You can either buy a new mainboard directly from BenQ and replace it yourself or you can phone them at  866-600-2367  and they will recommend you your closest authorised repair shop.

Posted on Sep 08, 2010

  • Azrael SRL Sep 09, 2010

    As i said it's the mainboard, there's only one in your projector. It can be easily obtained from an authorised repair shop and it will cost you around $100. But if you must send it to them to be fixed then it no longer becomes worth the money: with  the $200+ they will charge you you could buy a brand new one.

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  • Master
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Hello Mailbag267, hi, you may need to check for open connections from your power supply to the main board. recheck everything again, you may have forgotten a connection. check also the voltage on that shorted capacitor.

Posted on Sep 07, 2010

  • Jerry Umali Sep 08, 2010

    Hello sir, hi, this white screen is caused by a failure of the LCD main board video processor. the big IC on the main board. the cause is usually the failure of the power supply to supply correct current and over voltage. Don't get me wrong, before you replace the short capacitor, did you ever wonder why did the capacitor got shorted? so trace it back to the regulator section of the Power Supply. Now you need a replacement main board.

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You may have forgotten to re-attach the connector that goes to the DMD . It looks like a ribbon connector. That can cause this problem.

Posted on Sep 07, 2010

  • eagle338
    eagle338 Sep 08, 2010

    Yes I understand that you have already replaced the capacitor. The reason why I have suggested the ribbon cable solution is coz you may have forgotten to re-attach it after replacing the camera. If everything is good and you still have a problem, then the main board(which has DMD embedded on it ) needs to be replaced. Expect a bill of about 400$+ Shipping if you intend to ship it. If you want to get it fixed by your local projector repair guy then please get me the zip code and I will get you a list of techs in your area.

    Sai.

  • eagle338
    eagle338 Sep 09, 2010

    The part number should be on the board itself. That is the best way to look for the part number as the same board may have different versions in the same model no. Get me the part number and I will find you a replacement.

    Sai.

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