Nuova Marea MV-1501 (Unicont) Blink and off at power on

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  • selldoor
    Slow Learner
    • Dec 2010
    • 7870
    #61
    Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

    Running out of ideas here.
    Desperation -if you havent already easy test- FB1 to FB9 ferrite bead inductors test for continuity as you would a fuse. Also any 0 rated smd resistors.
    Next time logic/main board is off picture of bottom?
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

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      • sententia
        Badcaps Veteran
        • Oct 2013
        • 269
        • Greece
        #62
        Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

        i totally forgot the pic.. here it is...
        Attached Files

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          • sententia
            Badcaps Veteran
            • Oct 2013
            • 269
            • Greece
            #63
            Re: Nuova Marea MV-1501 (Unicont) Blink and off at power on

            Now i have tested all sot23 transistors on the logic board so nothing new there.

            Now i do think my best option is to go for a new logic card. The 12V input ones i have found do come with their inverter. I wonder if it would be possible to keep original inverter to keep and use the brightness knob on the front of the monitor.

            By the way cleaning with alcohol some ics revealed their markings. I am positive now that the main ic on the inverter is a LM339 voltage comparator. It is a so14 ic and does have +VCC on pin 3 and -VCC on pin 12 which is the current layout of the inverter. Pin 14 (Output 4 of the 339) is driving the two 4-dip powerfets on top layer (IRFD024). Pin 13 (output 3) is connected to one pin of the power led through a 330ohms resistor.

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