Question about JVC AV-56P575 56" Rear Projection HDTV-Ready Television

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BLUE tint instead of black

My picture looks great except when blacks are present which are replaced by a bluish tint. What happened and how can this be resolved? I can disassemble and solder just about anything so making the repairs myself wouldn't be an issue. THanks in advance for all your help. Mike

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  • maitaka Oct 05, 2007

    Hey, thanks for the quick response.
    Would you explain what is the BLUE color control and how would I go about adjusting it? I don't think it's something that I can do through the menu since I've already looked for something like this.

    I can use the scope, multimeter and pattern generator to fine tune the picture, but it would be great if I knew how to adjust the blue color. THanks so much for your help.

  • maitaka Oct 05, 2007

    I'm wondering if there isn't sometype of cold solder joint or an electrical component or components that have gone bad since this set was working perfectly just a few days ago.

    Would you guys have any other suggestions apart from just a color adjustment?

    Thanks again for such quick responses.




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This is an indication that the blue gun is being driven too hard. Have you tried to adjust the blue color control? If not try this first and if the control can not adjust the color then you will have to find out if the control grid on the blue tube is working and has the proper voltages present. Which you will need the following equipment to do. Multimeter Oscilloscope Along with these you will need a schematic to show you what the signals and voltages should be. And I might also suggest having a pattern generator and using the color bar signal since more then likely that is the one being used in the schematic as the reference signal.

Posted on Oct 04, 2007

  • Henry McKelvey
    Henry McKelvey Oct 05, 2007


    There should be an adjustment inside the set which is basically a course adjustment for the intensity of the color Its location should be on the schematic around the area of the blue video amplifier.



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