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5 Answers

Rca P56820BL No Picture Can hear Voices. Any suggestion

Sometimes you can get picture w/sound, then, a few seconds later the screen goes black. Still have sound. Any suggestions what is happening?

Posted by on

  • 4 more comments 
  • lmoden
    lmoden Mar 11, 2008

    Followed your steps. I show on my screen as:
    P0 V0
    7.29
    TVG235
    I assumed the parameter P is already there as above. Done this a few times to make sure I follow the directions. But when I released the menu and I was able to chang the V0 to V76. But using the channel up/down does not change anything. So I guess I am using the P, you suggested?
    Exit the TV and waited a few minutes. The picture don't come on but do hear the sound.

  • lmoden
    lmoden Mar 15, 2008

    Like to get the TV working if possible. Have not heard from sweet_rascal since I responded.

  • lmoden
    lmoden Mar 16, 2008

    Where would I find this bad connection in the horizontal? Is it on the main chassis board? I have the service data sheet which shows the device and function of that device. There appears to be the horizontal driver, horizontal output, etc. I had the main chassis board out and noticed that L14201 called Line Filter has two wires connected to it. One wire is loose, meaning it comes out and the other you can't as it is snug.

  • lmoden
    lmoden Mar 16, 2008

    All the information given from everyone, are these could be problems located on the Main Chassis Board? If the answer is yes, is there a company that can check the main board or replace the main chassis board? I am not an expert, just going by the data sheet and what everyone is suggesting. If no, I live in a rural area where there are no TV Repair person. So if you think I can fix it mayself, I would need to know the steps you would take to fix the problem.

    I work on my vehicles, fix computer problems, etc. All because I read to learn. I am eager to learn to fix the TV, but can't find any information beside the manuel which doesn't help.

    Linda

  • lmoden
    lmoden Mar 19, 2008


    We took the main chassis board out of the TV and inspected. There appears to be no corrosion, mucky contamination or anything. Per the Service information diagram, the item L14201 (Line Filter)has two red wires. If you push the left red wire down in the part, the tv plays for up to an hour before the screen goes black, voices U hear. If I keep doing this, the time the screen stays on gets shorter and shorter. It is like something is getting warm to hot and you can hear a click sound and the screen goes black. It leads me to believe something is getting a little to hot and tells the screen to turn off. You still have power to the TV as you can still hear voices from whatever show is playing.



    Lin

  • lmoden
    lmoden Mar 21, 2008

    Hi, I sent a last reply w/Picture. Is there anyone there?

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5 Answers

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  • Master
  • 8,617 Answers

Sounds like the tubes are blanking due ti vertical output. Try resoldering the vertical output IC and see if that corrects the problem. If not chances are the HV splitter or Flyback is bad. And in answer to your question. PTS corp may possibly have the board or at the very least they can rebuild yours. here is a link to PTS. Try soldering the Vertical first. if you need to know how to check the HV splitter let me know. If all else fails call pts's toll free number to see about a rebuilt Circuit board. Hope this helps.
http://www.ptscorp.com/

Posted on Mar 21, 2008

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  • Master
  • 6,966 Answers

Hi lmoden,

With the indulgence of sweet_rascal, salt56 and robotek...

The coolant leak and/or the horizontal/HV problem are on track. However, if for some reason problem persist, may I offer alternative area to focus on?

It is also possible for the vertical IC to go bad. Either that or a diode across 2 of the pins of the same IC. Indications would be excessive heating of the IC.

Hope this be of additional/alternate 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 Mar 16, 2008

  • 1 more comment 
  • Louie  Role
    Louie Role Mar 19, 2008

    and Hi again,

    I don't think the photo is that of the line filter L14201. It appears to be the FBT (flyback transformer). The left red wire (slightly smaller) would be the screen output that normally goes to a small PCB at the rearend of the CRT while the slightly bigger red wire goes to an anode cap supplying the EHV near the face of the CRT. In some cases prior to reaching the CRT it would pass a tripler box.

    If pushing on the slightly smaller red wire makes the unit work, then it is very much possible that you have cold solder pretty near that area. Chances are that it would be a power component or one that passes relatively high current. Often cold solder when viewed from the foil side would look dull and grayish. A good solder joint on the other hand would be silvery and shiny. A good place to start looking for cold solder would be the multi pins of the FBT.

    Of course this does not discount the possibility that the terminals of the smaller red wire are corroded or loose.

    Hope that this be of additional help/idea. Cheers.

  • Louie  Role
    Louie Role Mar 21, 2008

    Any new development(s) with your TV concern?

  • Louie  Role
    Louie Role Mar 22, 2008

    Rating practically everyone as "Thanks for Trying" doesn't sound encouraging for those willing to provide assistance and would discourage posting of other possibilities/solutions.

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  • Master
  • 1,512 Answers

Hi Imoden, does this problem occur all the time, or just once in a while?

Posted on Mar 15, 2008

  • 7 more comments 
  • Graeme Ross
    Graeme Ross Mar 15, 2008

    i would suggest that you give the pcb an inspection for corrosion from coolant that may have leaked down onto the PCB. This will cause the problem you are experiencing. Sometimes cleaning it away with a PCB cleaning solvent will cure it

  • Graeme Ross
    Graeme Ross Mar 16, 2008

    the problem may still remain that the CRT coolant may continue to leak... if you let this go, you may end up with expensive repairs to the set. resealing the leaky tube is another problem altogether, and one that may need expert attention and several hundred dollars in parts. Check for this board contamination first

  • Graeme Ross
    Graeme Ross Mar 16, 2008

    If it does not appear to be a board contamination problem, a careful inspection of the soldering about powersupply and EHT stages would be in order and resoldering any suspect dry joints. I should also point out that as a qualified electronics tech... I hold an Electrical Work License for training done working on mains powered and high voltage electrical equipment. If you have no training or knowledge of this type of electronics, then I suggest you get a repairman out for a look at the set. It is NOT a menu problem as suggested by some others. Good luck. Ask me any questions you may have and I will continue to assist you:)

    regards
    Graeme

  • Graeme Ross
    Graeme Ross Mar 16, 2008

    ps I know that if you are unable to do the prescribed work, then I may have not "fixed" your problem, but my advice is sound. It may save your life also!! A FixYa rating would be fantastic from you for my advice.

  • Graeme Ross
    Graeme Ross Mar 16, 2008

    the set would not powerup at all in connectivity through the line filter was lost.

  • Graeme Ross
    Graeme Ross Mar 16, 2008

    If it is an knife edge capture type connection to the line filter then you can get a better connection to it by retinning the wire to build up solder on it and reinserting. The more you wriggle this type of connection the more loose it will become. If it is a soldered in type device, then resolder the loose connection.

  • Graeme Ross
    Graeme Ross Mar 16, 2008

    getting replacement boards for a set at any age can be problematic. They are factory aligned to begin with and only enough boards are generally made to support warranty changeovers are provided for in the manufacturing process. Only manufacturer appointed agents can get access to this sort of part also. If you can get another board, the cost is often what a replacement set is worth!!!. Aslo, it is not really feasible to get a changeover board because of the complexity of realigned and adjusting that board to you set, hence the need for a qualified service guy that has experience. The Vertical chip mentioned by Benimur(and now i read back, was referring to, but forgot to name) , is located on a heatsink towards the front of the chassis. contamination and corrosion created by the CRT coolant leak. The problem of coolant leaking onto the main PC may still go on as the leak that allowed it to get there in the first may still allow more to leak onto the board. The 3 tubes used in the set have a pool of coolant to draw heat away from the phosphor coating of the CRT. Projection TV are prone to this coolant leaking and causes major problems with corrosion of electronic parts that it comes in contact with.

    So check for this problem.... if you find any sticky muck on the PCB, particularly about the vertical output chip, then this is what needs to be sorted out.

  • Graeme Ross
    Graeme Ross Mar 17, 2008

    How did you go with the set? Any luck with checking out the chassis for contamination?

  • Graeme Ross
    Graeme Ross Mar 21, 2008

    Hi Linda,. Symptomatically, the screen connection to the fly back transformer you have pictured being loose would account for the problem. As Benimur has said, it is not the line filter you have pictured, but is indeed the flyback transformer (FBT)so it appears you are on the right track.

    . Have you already checked for soldering problems, or indeed just resoldered the major components about the FBT. Sometimes Dryjoints can be hard to find, particularly intermittent ones. If you cant get a decent connection to the FBT screen, you may have to replace the FBT.

    BEWARE. There are residue voltages about these stages that can give you a nasty jolt even after the set it turned off.

    regards
    Graeme

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  • Master
  • 373 Answers

If the picture is intermittent (sometime works and sometimes doesn't) then there is likely to have a bad solder connection in the horizontal causing the set to loose high voltage.

Posted on Mar 15, 2008

  • TV Doctor
    TV Doctor Mar 15, 2008

    Also these sets are bad for the flyback HV transformer to go out and they could be intermittent before they go out competely. It is the white square piece with the large red wire coming out. But check for bad connections first. Hope this helps

  • TV Doctor
    TV Doctor Mar 16, 2008

    I have another suggestion: You may have a bad connection on the filament circuit which comes off the flyback transformer through a resistor to the sockets of the crt's. However if the loss of picture is sudden then this would not be the case. This case would loose the picture gradually

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  • Master
  • 1,894 Answers

Hello dude

Posted on Mar 07, 2008

  • dewan nafees ahmed Mar 07, 2008



    1. TV turned on

    2. Press and hold the 'Menu' button at the tv.

    3. Press and release the 'Power' button.

    4. Press and release the 'Vol up' button.

    5. Release the 'Menu' button.

    6. The initial security parameter displayed will be 'zero' Change this to '76'.

    You are now in the Adjustment mode


    7. Use the 'Channel up or down' to select parameter 'P'.

    8. Write down the old value of the parameter before changing.

    9. Use the 'Volume up or down' to change the parameter value.

    10. When you have made all the adjustments you want turn the set off to exit.

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