Westinghouse EW50T5KW no backlight

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  • speter
    Been around the
    • Dec 2009
    • 77
    • USA
    #41
    Re: Westinghouse EW50T5KW no backlight

    Q103 was disconnected for that.
    Q103 temporarily shorts B+ to ground and kind of twangs the L101 transformer, to double the voltage?
    I had no voltage on PFC_Vcc without BKon jumpered, varying voltage between 1 and 8v when BKon was jumpered
    I had / have 13v for VCC
    Last edited by speter; 11-10-2020, 02:27 PM.
    Goshen NY, USA

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      • speter
        Been around the
        • Dec 2009
        • 77
        • USA
        #42
        Re: Westinghouse EW50T5KW no backlight

        Giving up. Ordering another board.
        I wonder if I input 220v or more to it, if it would make any difference, as the boost circuit would not be needed The Ps is rated 100-240v
        I could easily supply it with DC, but I don't a step up transformer for AC
        Tried 350vDC (should be safe, as 240vac is a higher peak voltage), no change, likely something with the boost transformer
        It seems as though the board will do DC just fine, as both 12v and 5V were present
        Last edited by speter; 11-11-2020, 05:21 PM.
        Goshen NY, USA

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