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RCA filiament measurement.

Discussion in 'Electronic Repair' started by Dani, Oct 21, 2007.

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  1. Dani

    Dani Guest

    Got a ATC113 27" RCA TV, with no filiament. The CRT lights fine on the
    CRT rejuvinator. How can I measure the filiament from the flyback?
    It's 15750 khz. I'm getting continuity, but can't
    get a frequency reading...my meter isn't reading properly on this
    scale. Can I use a "rectifier"
    circuit for this? What do you guy use? Dani.
     
  2. what a sad pathetic loser wanna be tv repairman.
     
  3. PeterD

    PeterD Guest

    what a sad pathetic loser wanna be troll.
     
  4. AJ

    AJ Guest

    Remove CRT Board from neck of CRT, measure resistance across the filament
    pins of the socket, check connections back all the way to the LOPT. Should
    be a direct connection from the LOPT to the CRT Socket. Look for any small
    value resistors in series and any coils that may have opened. Presuming the
    set produces HV there sohuld be plenty of current to drive the filaments.
    Other possibility is the specific winding in the LOPT may have opened,
    desolder those connections and check resistance of the actual winding.
     
  5. what a sad pathetic loser wanna be dog fucker
     
  6. Jerry G.

    Jerry G. Guest

    You will need a scope or a lab meter that can read RMS up at that
    frequency. With the scope, use it in the RMS mode, or simply calculate
    the RMS from the waveform. This must be done under the load of the CRT
    heater.

    Another solution, is to physicaly trace back the path, and verify all
    connections, soldering, and any components along the path. If you do not
    find the fault, then the first method I mentioned is a proper start.

    --

    Jerry G.


    Got a ATC113 27" RCA TV, with no filiament. The CRT lights fine on the
    CRT rejuvinator. How can I measure the filiament from the flyback?
    It's 15750 khz. I'm getting continuity, but can't
    get a frequency reading...my meter isn't reading properly on this
    scale. Can I use a "rectifier"
    circuit for this? What do you guy use? Dani.
     
  7. And/or substitute 2 or 3 turns around the flyback core direct to the
    CRT filament pins and see if it lights up.

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
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