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The TV would be on, the "arch" white on the screen with a loud "boom" and shut off. We would turn it off for a while, put it back on in about fifteen minutes, it would be okay. Then the frequency would increase until finally, you go to turn the TV on, he light turns from red to green but then there is a single "click" sound, and the light turns back to red. This happens within a few seconds. Took off the back and saw black dust by the HV distributor. Boards have cold solders on them: meaning already been worked on, and they are clean. The only part of the back that had the black dust was where the Sanyo VH distributors were. fuses looked good, every thing else looked good. Now what? Thanks Pittsburgh Rose

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  • nurseroseluc Mar 19, 2011

    Sorry thought I put that in there: Pioneer Elite Pro 710, old projection model

  • nurseroseluc Mar 19, 2011

    Do not know what has been worked on.

  • nurseroseluc Mar 19, 2011

    I have a Pioneer Elite Pro 710 rear projection.
    The TV would be on, the give a "arch"like white curved light on the screen with a loud "boom" and shut off. (When the picture is on, its good. But this seems to happen every time we change it from "factory" settings to what I wanted in tone and contrast.) We would turn it off for a while, put it back on in about fifteen minutes, it would be okay. Then the frequency would increase until finally, you go to turn the TV on, he light turns from red to green but then there is a single "click" sound, and the light turns back to red. This happens within a few seconds. Took off the back to see if there was any LED or signal lights on when it would turn on. There was not. Yet I saw black dust by the HV distributor. The Power Boards have cold solders on them: meaning already been worked on (I got this TV used and previously serviced) , and they are clean. The only part of the back that had the black dust was where the Sanyo VH distributors were. Fuses looked good, every thing else looked good. Now what?

    I ask that not as though I would touch it, for I am not an expert, that is why I am here, paying to ask someone who is.

    I know black dust is not good, a carbon dust from something over powered. I know enough to buy the parts when I get the service man over, that way I am not overcharged. Does this sound like I need a new HV distributor? A new video card? I check Ebay and parts for this TV are not easy to find. Gotta go to Pioneer, and its not pretty.

    What is your best guess about what this gonna set me back?

    I have had the TV for two years now and got it for a song. Love it for it takes a beating from the 1 year old grandchild which by now would have destroyed a plasma or an LCD.

    I would love to hang on to it, but is it worth it?



    Thanks Pittsburgh Rose

  • nurseroseluc Mar 19, 2011

    I have chosen another "expert"...I found your comments insulting to me: as though I would be stupid enough to work on such a high voltage piece of equipment. It costs money to ask questions when I could have called around here for free, so you best learn to express yourself better, learn to be patient with those new to writing for "techs" instead of conversational expression, and learn a new answer other than"Get a professional"...WOW, for $12 bucks a question, you don't say? there is a reason your rating is what it is, I see that now.

    People get on here to learn, sound intelligent and save money, not waste time on people who claim the be "experts" and have their own agenda..."Call me, I will come to fix your TV..." got lots of guys right here in Pittsburgh to do that...I wrote here to learn, and that I did, never to do this again.OK?

  • nurseroseluc Mar 19, 2011

    LOL...okay, now all that in single mom english please! : )
    Flyback/same as HV distributor?

    What am I looking at in parts?

  • nurseroseluc Mar 19, 2011

    Silver Dragon...well done!
    Thank you sir...thank you.

  • nurseroseluc Mar 19, 2011

    Silver Dragon: spoke informatively, practically and matter of factly...much to my disappointment, I guess I am getting a new TV!
    Thank Silver Dragon.

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  • Master
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This is a classic "Hic-upping" switchmode power supply problem. The protection circuitry inside the SMPSU, has sensed a severe potential problem, and is attempting the shutting of the set, down to avoid a fire, explosion, or both. Although it is evident that you may already have had the explosion... Any explosion, always has a bad consequence, and destroys the component(s) concerned. there is also frequently, "Co-lateral" damage, caused by the failure...

This set had developed a problem, that is so severe that the set must be shut down, (This set should be removed from the Power),

What is happening is the internal "Fault" that is causing the Protection Circuitry , to detect the problem and attempt to shut down the set, keeps restarting the set, because as soon as it shuts down, the "Faulty" component(s) cool down?, and the "Fault" ostensibly "Clears" so the PSU starts up again, only for the component(s) to heat up, whatever, again and fail, so it shuts down, and if left unattended, this would continue on until the part eventually failed. As related this is called a "Hic-upping Power Supply". Any fault that involves the power supply is usually quite serious, and needs a professional, usually, unless one is familiar with servicing current day, televisions.

And in my professional recommendation, you should get a "Quote" for repair, from, an, Approved Service Center. Now, this point is very important for a good result, Always contact, their "Local" or a, "Head Office" Sanyo in your case. Ask them, for a referral to an authorised servicing center, where you ask for a "Quote". Now, when you get the information you want, then you can decide as to repair of replacement.

The reason we want an approved agent, is that way, all the engineers are trained on their own brand sets, they have seen almost all faults, and will get the job done quicker, and for less cost, and usually have parts on hand, also sometimes, there has been a service bulletin in issued and the repair may be subsided or even free. There are many, many, many reasons that display this symptom, one must work through the troubleshooting steps to isolate and identify, the Cause and repair that and any damage done.

Unless one has money to spare, hours to spare, access to a service manual and spares, plus the required aligning, programming & servicing equipment & knowledge.. DIY service of these sophisticated computer controlled digital receivers, ie: The TV, is in reality rather impracticable.
These sets are often a challenge for even qualified engineers, and things can actually be made worse by inexperienced DIYers, say doing something as simple as doing a setup step out of order.

Posted on Mar 19, 2011

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  • Master
  • 1,112 Answers

Hi:
You have not mentioned if this is a rear projection set, meaning has pictubes, but from the discription you are giving i am asumming so. Check the High Voltage retrace scan Capacitors near and around the Flyback Transformer, also the Flyback could be arching inside of its casing. It is best to change the flyback transformer and the horizontal output transistor, they work in conjunction with each other, The H.O.T is mounted on a heatsink in the same area of the transformer. You might also try checking the High voltage spitter this device seperates the high voltage from the flyback to all three tubes.

Posted on Mar 19, 2011

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  • Televison & ... Master
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Hello
You haven't specified anything about your TV in your post; that i means, its brand name and model number etc; Please provide these to me by Fixya, and it will help me to detect the fault, and help you. The model number is important as well as brand name. Give me some details about what you have done in it till now, and which componets has been replaced. OK.

Posted on Mar 19, 2011

  • The Knight
    The Knight Mar 19, 2011

    Its video processing section has been damaged. it must be replaced as card basis. Please don't attempt to make any repair be self in projectors, if you aren't an experience serivce technician, or without any knowledged person by side. It will turn the things worse, and get the device irreparable. moreover, the spare parts and cards of old type of projectors will be very difficult to get too. So proceed with thinking. It will be better for you to contact the nearest Pioneer authorised service center. OK.
    .

  • The Knight
    The Knight Mar 19, 2011

    Hello
    The problem of your TV seems to be complicated. But the dust will do not much until it accumuate nere a very high voltage secion. No schematic of your Tv model is now available on net. If so I could advice you more. pioneer's spare parts, whichever devices' may be, won't get very easly. Get it checked by any experienced service technician. OK

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