Question about RCA F36650 36" TV

4 Answers

I have an RCA F36650 36" TV that quit working after a power outage. When I first attempted to power the TV on, the power on indicator came on, but I had no picture or sound, and then after a couple of seconds the power on indicator went off. Not being sure if this was a glitch or a real problem I unplugged the TV and let it sit for a about five minutes. I then attempted to plug the TV back in. When I did this, The TV had a very high pitch chatter emitting from the rear of the set, and now I could not get the power on indicator to light, and of course still no picture or sound. So, I removed the back cover to trace the sound, the sound appears to be coming from LP03, the BIAS (B+) transformer feeding the primary to the flyback transformer? The question is, is this high pitch chatter coming from LP03 telling me the problem is LP03, or a symptom of a different failure in this circuit? And if it possibly a symptom of another problem, what could the problem be?

Posted by on

  • mjknfun Jan 04, 2009

    FBT? Flyback Bias Transistor? and test ring? I have an electronics background, but have not made a living this way in about 13 years. Thanks

  • mjknfun Jan 05, 2009

    no it is not still under warranty

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4 Answers

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  • Master
  • 1,239 Answers

HI
Check capacitors 3 of them if cp150- 2200uf 16 is puffed up on top it is bad so replace other 2 caps cp114 cp120 220uf 35v. These are on the Deflection board, also resolder pinns on FBT.capacitors are green with gold writing on them. There is 2/3 on bottom First board to the left is the Deflection board next to it the one that has tuners where you hook cable to is the SSB board the board with AC Power cord is AC board

DEFLECTION BOARD has Flyback Transfomer on it has 2 wires coming from part red/black-/.one of the wires goes to high voltage trippler other one leads to focus/screen control block it has 3 controls on top 3 on bottom R/G/B

Posted on Jan 04, 2009

  • ABHISHEK.C
    ABHISHEK.C Jan 04, 2009

    you can check the three little red fuses next to the flyback transformer , but then if not that then the convergence IC's will need to be replaced and the resistors checked on it for possible replacement


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  • Expert
  • 192 Answers

If it is still under worntee they might be able to fix it for you.

Posted on Jan 04, 2009

  • Michael Ward Jan 05, 2009

    Well it might be just time to get a new TV especally where everything has to be DTV by next month. If you have dish nework or direct tv as your servas provider you might not have to have the converter box for the tv.

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  • Master
  • 1,952 Answers

The chirping you hear is the switch mode power supply attempting to start up. It is unlikely that the resistor is the only problem. Something caused excessive current draw through that resistor.

Posted on Jan 04, 2009

  • 2 more comments 
  • mohammed marika thambi
    mohammed marika thambi Jan 04, 2009

    it does have a fuse in it you might want to check, but in most cases i
    would say the power supply in the tv has gone bad. it is hard to say
    without testing some voltages in the tv

  • mohammed marika thambi
    mohammed marika thambi Jan 04, 2009

    This is a famous problem for RCA RPTV sets. They develop problems in
    the main power supply and over time it finally give out completely.



    It can be other areas of the tv such as high voltage generator,
    horizontal or vertical deflection amplifiers or even the convergence
    systems, but it is most commonly the main power supply or one of the
    voltage regulators within the power supply system.



    In most cases the repair is expensive and often more than is
    justifiable. Typical repair costs for the power supply are $300 plus
    or minus. Repair costs for the convergence circuits is always around
    $400. Horizontal or vertical repairs usually run around $200.



    I suggest you talk with an RCA authorized service outlet before
    deciding what to do. Unfortunately, the RCA brand is not known for its
    reliability and will likely have another breakdown before too long if
    you do decide to repair it.

  • mohammed marika thambi
    mohammed marika thambi Jan 04, 2009

    If the set has an audio output on the back of the set or a headphone
    jack just use an external amp/speaker for good sound and shut off the
    internal speakers.



    You can get a pretty good sounding little system with subwoofer at the
    pc store for $20.00 and up. You may have to buy a cord that will go
    from the audio outputs into the PC speaker set, but that will be just a
    few dollars.

  • mohammed marika thambi
    mohammed marika thambi Jan 04, 2009

    If it were the high voltage only, the sound usually continues working
    normally. With no sound nor picture it is usually the main power
    supply. Common on big tube sets is the failure of the rectifier bridge
    in the main power supply. Do you know how to check it? If you have a
    vom you can see if there is any B+ voltage coming off the rectifiers.
    Or, you can pull them/module out and check it with a ohmmeter.

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  • Master
  • 6,966 Answers

Hi and welcome to FixYa,

On most TV units, with your described condition, primary suspect would be the Horizontal Out Transistor (HOT) which could be tested forward & reverse with an ohmmmeter. Likewise to test ring tested would be the FBT.

Good luck and Thank you for using FixYa.

Posted on Jan 04, 2009

  • 1 more comment 
  • Louie  Role
    Louie Role Jan 04, 2009

    FBT would be the FlyBack Transformer or Line OutPut Transformer (LOPT). A ring test is check for the FBT out of circuit using an instrument that sends pulses to the FBT's primary circuit. Thereafter a comparator circuitry checks the number of damped oscillations or 'rings' produced and determines if the primary is good or not.

  • Louie  Role
    Louie Role Jan 04, 2009

    Incidentally, another responder mohammed387 has posted on the chirping sound which is the power supply. He has copied this information among others from here, here and here.

  • Louie  Role
    Louie Role Jan 04, 2009

    Appreciate the Ask Me. Pls update any developments.

    Cheers.


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