Question about Sony KV-36XBR400 36" TV

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36XBR400 D board backside capacitor blues

I had the 'blinks', diagnosed it down to a bad i.c. on the D board, replaced same. (I don't know what was tougher, removing the board, or replacing the I.C.) Anyway, there is what appears to be a small capacitor in black goo on the BACK side of the D board (just opposite the I.C. I replaced). It ohms open and is outside the capacitance range of my meter(2n to 2M)...(All measured in situ!) A wise tech would replace it IMHO. What is it, if not a cap, and what voltage rating and value? Thanking anyone with a schematic in hand, in advance:

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  • cary mcdonald Jul 04, 2007

    Yes, it very well may be a VDR. It is on the backside of the board, below IC 8002 (HV Driver/conversion IC)and looks like a 'opps', lets put this in... kind of add-on, what with large pigales, and covered with black goo. (Core of it appears silver though, not like a cap). (Perhaps a device to bring down the HV circuit if it climbs above 35v?!)
    All right. I'll power up the board and check it out anew (with the new IC 8002).

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What is the designation (the letters/numbers printed on the board right next to the part) of the part? If it is a cpacaitor then it is cesignated Cxxx, but I have a feeling you are looking at a VDR, or voltage dependant resistor that Sony loves using in their power supplies. A VDR will test completely open on an ohm meter and open on a cpaacitance meter, which means it is good. A VDR that shows resistance on an ohm meter is bad and will probably have a burned resistor (typically 10 ohms) next to it. A wise tech would NOT replace a VDR that measures open!

Posted on Jul 03, 2007

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