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Power relay

Discussion in 'Power Electronics' started by Zepha, May 12, 2021.

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  1. Zepha

    Zepha

    1
    0
    May 12, 2021
    JVC CRT TV MODEL NO. 21MX76 relay located in the power section switches on and off. TV doesn't power on but standby led keeps on. All capacitors in the power section are ok. What could be the problem? Please help!
    Thanks.
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,413
    2,619
    Nov 17, 2011
    First check whether the switching of the relay is due to
    1. the control signal (coil) to the relay being switched on and off.
    2. the power supply voltage to the relay dropping and consequently the relay turning off.
    3. none of the above but a defect in the relay (improbable with these symptoms).
    Note that possibly lethal voltages may be present in this part of the circuit. Take all necessary precautions to prevent an electric shock.
     
  3. Bluejets

    Bluejets

    4,748
    999
    Oct 5, 2014
    A large percentage of relay clicking is power supply problem of one type or another.
    A schematic would be helpful but not essential to anyone familiar with power supplies.
    For you to follow might be a problem.
    How do you know all the caps are ok..??
     
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