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Sparking rca tv model# mr_21v27. tv not come on when press on. but could hear sparking right by picture tube driver. one or two time so. if press power bottom same happen. what is my tv problem? need help please! thanks.

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  • solver gariz Apr 15, 2009

    hi. TVTECHBERT. the horizontal transistor is good when i test. but only have output 78v , the flyback is good. what is be? thanks

  • solver gariz Apr 16, 2009

    i take the flyback down. use same number new flyback put in. working same thing. tv still not come on . sparking in picture tube driver. so what will be????

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My guess is the Horizontal Output transistor is shorted and you have a bad Flyback ( HV transformer)
This is very common on that set.

Posted on Apr 15, 2009

  • tvtechbert Apr 16, 2009

    How do know the flyback is good. Even with a ringer the flyback may read good. The only real way is to substitute. Most of these sets with a bad flyback will start just for an instant. Maybe only 1/10 of a second. The spark maybe comming from the attempt to start. The power supply recognizes the overload and shuts the set down. If you remove the output and place another load on the power supply ( 60 watt lamp) do you then get 125v dc at start and does it stay on. If so your problem is still the flyback. These transformers have componnents ( doides and caps ) internal that short. The only way really to find out is to swap it out.


  • tvtechbert Apr 16, 2009

    If the sparking is in the neck of the tube then you have air in the tube.

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