Sony Trinitron KD-28DL10U red, green, red, green OCP fault

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  • R_J
    Badcaps Legend
    • Jun 2012
    • 9535
    • Canada
    #41
    Re: Sony Trinitron KD-28DL10U red, green, red, green OCP fault

    Check and see if you get the +135 volts on the main board near the flyback, it should be marked, if not check it on pin 3 of the flyback transformer or C525.
    If it is there for a short time before shut down the power supply is working and you don't need to check in that area.
    I suspect that it is a is a shorted component somewhere in the high voltage/horz. deflection circuit.

    So is there +135 volts? if yes
    is there the +200 volts on c513 or cn508 pin3 ?
    Last edited by R_J; 03-26-2015, 10:34 AM.

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      • PCS_
        Member
        • Mar 2015
        • 25
        • England
        #42
        Re: Sony Trinitron KD-28DL10U red, green, red, green OCP fault

        havrnt had time to do any more on the set due to family commitments but I'm going to see about checking voltages tomorrow, thanks for the info much appreciated

          Comment

          • PCS_
            Member
            • Mar 2015
            • 25
            • England
            #43
            Re: Sony Trinitron KD-28DL10U red, green, red, green OCP fault

            Hi, sorry for the extremely delayed reply

            There's 135v b+

            I removed the HOT and connected an incandescent bulb, stayed lit for a few second
            There's only two voltages present on the Flyback, they are the b+ in and the 200v pin which reads as 135v.

              Comment

              • PCS_
                Member
                • Mar 2015
                • 25
                • England
                #44
                Re: Sony Trinitron KD-28DL10U red, green, red, green OCP fault

                I have also checked the main filter cap and diodes around the HOT and they appear fine.

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