Question about RCA P61940 61" Rear Projection Television

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My rca p60752eblg2

I have been told my hv splitter is bad. i have read things on the internet that usually when the hv splitter goes bad, the R721U is fried as well. the problem the tv is having is when you hit the power button on the tv, it makes an arching noise. any suggestions?

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  • Caddyman30 Dec 05, 2007

    this may be a stupid question, but what is the flyback? how do i find this r721u? is it a part that i can replace? should i replace the hv splitter, part number 205064?

  • Caddyman30 Dec 05, 2007

    ok guys, i replaced the splitter. still, i have the same problem. the set actually did sound like it was going to power up and then it shut down, no more noise at all. smelled a buring smell. what can i try next?

  • Caddyman30 Dec 05, 2007

    another stupid question.... what is the "flyback" you are referring to? is that another name for the hv splitter. if so, i got it from a local electronics store here in charlotte. part number 205064. this r721.... what circuit board would it be located on? i noticed a circuit board behind a plate you take off to get to the hv splitter. is it that board? if that one is blown, who would i get the part from, and how much am i looking at. also, do you think i have damaged this new splitter?

  • Caddyman30 Dec 06, 2007

    i will try to find that r721. how hard is it to replace? is it dangerous? thanks so much for all the info you have given thus far.

  • Caddyman30 Dec 07, 2007

    ok, i looked on the big circuit board and could not find r721u. i did notice small circuit boards on the bottom side of the glass tubes (3 of them total) is where the arcing is coming from. i wanted to make sure before i tried to remove one of the circuit boards if this was dangerous or not. i dont want to get zapped if you know what i mean. i want to make sure that these tubes, whatever they are, dont hold a charge. thanks again!

  • Caddyman30 Dec 07, 2007

    ok, thanks again for getting back to me. i want to make sure before i do this that by pulling that tube out, i do not risk in danger of shock. i was looking at it, do you think it would be best to take the circuit board lose and then pull the whole unit (lamp and all) out from the top and clean it that way. you can see inside on some metal some arcing dustings. that is what made me think the tube was bad. it is the red tube. anyways, let me know if it is safe to pull the whole unit out. thanks again.



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Yes it does sound like the flyback is bad, the only other thing that arc is a picture tube.

Posted on Dec 05, 2007

  • 4 more comments 
  • Cary Farah
    Cary Farah Dec 05, 2007

    I don't have access to a service manual so i don't know the part numbers, but the fly back is the biggest part in there and it also contains high voltage and you could get shocked from the tub if not don't correctly, the fly back will have red wires coming out of it and it has suction like cups going to the tubes, you have to ground a flat blade screw driver and ground it and get it up under each suction cup and release the high voltage from the tube, make sure your not touching the metal of the screw driver. as far as the resister r721u you have to look on the circuit board all the components are written on the board look around the flyback first it should be a small part you may have to move the part out of they to see the number, just make sure the tv is unpluged and don't touch anything with your fingers, one hand should be outside the tv at all times. once again im going to say this is very dangerous!

  • Cary Farah
    Cary Farah Dec 05, 2007

    Did you find r721? check and or replace. how did you get a flyback that fast?

  • Cary Farah
    Cary Farah Dec 05, 2007

    Yeah Flyback HV (high voltage )spliter one in the same im just from the old school i guess.
    I don't know where the part is i don't have access to a service manual, i would have though it be close to the hv splitter, im thinking it would be same like the size of a pencil lead, i think the hv would be ok.

  • Cary Farah
    Cary Farah Dec 06, 2007

    it small and it just unsolders two leads, no it's not dangerous, you replaced the sdk's you can do this.

  • Cary Farah
    Cary Farah Dec 07, 2007

    Tubes do hold a charge, however it's at the Anode part of the Tube( where the Red Think wire enters the tube that has a suction cap on the end). It's not common that the board would arc, it's more common that the tube (especially if it's one tube) to are making it that to be to be bad. clean all the smoke and dust off first.
    then if you pull the board off pull it straight down, do not twist, there may also be some glue on the side holding it on.

  • Cary Farah
    Cary Farah Dec 08, 2007

    NOOOOOOOOOOOOO do not pull the whole tube out unless you have to. you will have a nightmare trying to get it realingned



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Rank:nonexpert_s.gif Apprentice
Rating: 85%, 1 votes
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