Dynex DX-40L261A12 won't power on, relay clicking repeatedly

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  • smueller99
    New Member
    • Jun 2014
    • 4
    • USA
    #1

    Dynex DX-40L261A12 won't power on, relay clicking repeatedly

    Ok, I have this Dynex LCD that is now will not turn on. When power is applied, red light comes on, relay clicks and then after about 2 seconds clicks again. it then continues to do this until power is removed. This used to happen once in a while and would fix itself if left unplugged for a while, now it's continuous.

    I am attaching pics of the front and back of the power board, here are the voltages on the pins on the big ribbon cable connected to the main board (voltages that show a range show how the voltage varies when the relays click on and off):

    main board
    unplugged plugged in
    GND 0 0
    GND 0 0
    STB 0 4.1V - .054V
    5V_S 16-19V 5V - OL
    5V_S 16-19V 5V - OL
    12V .003V 11.7V - 0V
    12V .003V 11.7V - 0V
    GND .005V 0V
    BR1 .005V .43V
    SW 0V .045V
    GND 0V 0V
    GND 0V 0V
    5V_M .063V 5.2V
    5V_M .063V 5.2V

    Large cap is reading steady 222.7V.

    I don't see any obviously bulging caps anywhere, can anyone give me a hint as to where to start with this?
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