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I have an old sony plasma panel with no tuner model number pfm-42b1/42b2. when i turn unit on i get no picture but can hear tv cycling through start up sequence

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  • fonc May 30, 2010

    Thx for your help

  • fonc May 30, 2010

    Thx for your help

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What is the status of the LED at the front? Does it change into standby mode when the cycling is complete? If not then let me know whats the status of the LED when this is going on.

Posted on May 27, 2010

  • 2 more comments 
  • fonc May 30, 2010

    when tv on standby red light is on, when i turn the tv on green light comes on and the standby light starts flashing

  • eagle338
    eagle338 May 30, 2010

    Hmmm.. I am working on a similar problem on the same set with another customer and we have narrowed it down to a transformer on the power board. DO you have prior experience in handling electronics? Coz we are gonna have to test some components using a multimeter.

  • fonc May 30, 2010

    i do have a multimeter but have no experience in electronics

  • eagle338
    eagle338 May 30, 2010

    Then I am afraid you are gonna have to leave this to a qualified tech as the circuits hold potentially lethal voltage for several days after they are turned off(thanks to the capacitors). The problem you are facing is a common one. Its called a protection fault which means that one of the lines are over loaded aka allowing more voltage than it should. In most sets its the 5V and 9V lines that are culprits. This would cause the protection circuitry to kick in and the relay switches turn it off to prevent damage. Depending on the location of the relay that activates first, the circuits have to be analyzed component by component to locate the source of the problem unless you want to replace the whole board.

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