Panasonic TX-48CX400B low LED volts

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  • sintv
    Member
    • Feb 2015
    • 37
    • scotland
    #21
    Re: Panasonic TX-48CX400B low LED volts

    This seems to be a common problem with no solution. Ive got the same problem and I checked all leds and theyre fine. Just have to wait till I get a working set in so I can swap boards.

      Comment

      • zwarder
        Member
        • Oct 2013
        • 46
        • United Kingdom
        #22
        Re: Panasonic TX-48CX400B low LED volts

        Same problem here IC heating up to 110 degrees C then cuts out

          Comment

          • jesseharris227
            New Member
            • Dec 2020
            • 1
            • uk
            #23
            Re: Panasonic TX-48CX400B low LED volts

            Originally posted by Duranitron
            its not normal for the mp3394s to heat up if you have the schematics try to check all components surrounding the ic. also check the OVP circuit if you have an led backlight tester with current display let it fire up all the LED backlight from 80volts to 120vdc and let it lit for about 30min to an hour to isolate the problem that the LED backlight is not the culprit. my experience is 80vdc to 120 vdc current read out of 300mA max. it can pump up to 48 watts thats ok. there is always a possibility of shorting led when it reach the normal voltage so this test will surely catch it.check also if it has mosfet connected to the IC. hope you fix it just try and don't over see the obvious.
            Do you have schematics or know where I can get them fit this board

              Comment

              • PanasTC
                New Member
                • Nov 2023
                • 4
                • Canada
                #24
                I have similar issue where boars states 400V and I am measuring 160.

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