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tick tick tick

Discussion in 'Electronic Repair' started by Janice, Jul 21, 2005.

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  1. Janice

    Janice Guest

    Hello

    I have a problem that I can't find the problem to and woundering if you
    guys can give me a heads up on what to look for.

    Problem: 20 inch Sharpe Tv, Model # CR20T69
    I push the on switch and it ticks and ticks and ticks.
    Sounds Like the relay in the set.

    Any suggestions would be great!

    Thanks a bunch in advance

    Janice/in training
     
  2. kip

    kip Guest

    What have you done so far in diagnosing the fault ?
    Tell us more

    kip
     
  3. Janice

    Janice Guest

    Well I checked the horizontal ouput coil and seems to test well.(no opens)
    i check the high voltage caps and that seems to be within the tolerance
    (mfd)
    Checked Horizontal output trans and that is good as well.
    I am in the process of checking more capacitors for leakage in the high
    power section. Also checked the basics (fuse, relay, etc)
    Did a ring test on the flyback and that is good also.
    Also checked for opens in the horizontal deflection coil.
     
  4. Jim Yanik

    Jim Yanik Guest

    Depending on how old the TV is,it probably is bad electrolytic caps,perhaps
    in the power supply. You need a ESR meter to check them,or just replace
    them all.
    The next thing would be a shorted rectifier diode.
     
  5. Janice

    Janice Guest

    TV is 10 years old, but now I discovered that the ticking noise is
    comming from the flyback.... I tested all of the caps in the high
    voltage section and all diodes are good when tested.... I'm thinking
    maybe a cold solder joint perhaps....
    Thanks for the info....much appreciated

    Janice/in training
     
  6. kip

    kip Guest

    If you suspect a cold solder joint why dont you look for it ???

    kip
     
  7. sofie

    sofie Guest

    Janice:
    Are you absolutely certain that the horizontal output transistor is good.
    Take it out of circuit and test it again. Also check the flyback
    derived B+ circuitry for shorts or faulty components.
    If all of that checks out go back and test the power supply carefully for
    proper regulation and other faulty parts like shorted diodes, open
    resistors, open traces, bad solder joints, etc.
     
  8. b

    b Guest

    remove the HOT and power the set up. if it goes into standby, chances
    are the horizontal deflection has a problem and your power supply is
    probably Ok. Failing that, a short on one of the voltage lines is
    possible, eg. fried vertical IC. who knows?
    -Ben.
     
  9. Jim Yanik

    Jim Yanik Guest

    the "tick-tick" sound could be the power supply starting and re-starting
    over and over due to bad filter caps(ESR),very common in older sets,or a
    shorted diode causing an excessive load and triggering the primary current
    limit,making the PS re-start over and over.

    The electrolytics ESR would be the first thing I'd check (after looking for
    burnt parts) if I didn't have a schematic to check the PS voltages against.

    Dick Smith Electronics has a nice ESR meter,VERY useful,as a kit for
    ~$50USD,perhaps even less. It's also available assembled elsewhere.

    I have NO connections to DSE except that I own one ESR meter and love it.
     
  10. Guest


    Problem solved.

    Bad driver transistor (opened) in horizontal osscilator circuit.
    Also noticed and resoldered a possible hair crack on the primary of the
    horizontal transformer.

    Thanks for all the help guys
    much appreciated...............

    janice
     
  11. JANA

    JANA Guest

    This is very common, that the HV multiplier, flyback, and horizontal output
    transistor may have to be changed. Also, there may be some damage in the
    power supply as well. Also, an ESR test of all the caps in the related areas
    should be verified. There may be other collateral damage.

    These sets can be complex to service. A strong background in TV servicing,
    and having the proper service information is a great asset when servicing
    these sets.

    --

    JANA
    _____


    Hello

    I have a problem that I can't find the problem to and woundering if you
    guys can give me a heads up on what to look for.

    Problem: 20 inch Sharpe Tv, Model # CR20T69
    I push the on switch and it ticks and ticks and ticks.
    Sounds Like the relay in the set.

    Any suggestions would be great!

    Thanks a bunch in advance

    Janice/in training
     
  12. clifto

    clifto Guest

    Ungrounded aquadag. Broken picture tube. Pinhole in HV lead.
     
  13. Assuming the description of the problem above is complete, ignore him.
    It's probably an overload on the power supply - possibly a shorted HOT.

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  14. kip

    kip Guest

    Kip did not write that...
     
  15.  
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