Question about Pioneer PRO-710HD 64" Rear Projection Television

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Convergence IC's When watching a picture that does not fill the screen I have a balck line on the top and botton of the screen that about 2" wide but the middle of the black area pulls toward the center about 1" more than the outer edges. The grid square convergence adjustment works fine to aling the red and blue adjustments and the picture quality is great. when I watch something in 4:3 ratio, the entire picture pulls in to the center about 1" more than the outer edge of the box. I here that replacing the convergence amplifier IC's will fix most problems, But I am not sure if this is the case with mine. I was told my my dealor that if I replace the STK392-110 ICS's with STK-392-180 they will last longer. I would also like to know if they are a like for like replacement or will I have to replace some resistors also. Thanks for the help.

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  • Jim Hoffman
    Jim Hoffman Jul 27, 2006

    I would like to add that when watching a program that fills the screen, I can not see any problem with the picture.
    Until a caption box or info is displayed on the bottom of the screen then I notice it.



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It does not sound like a convergence problem as you stated that all the lines match up and are ok??? You have space at the top and the bottom, as well as on both sides? Well my friend it sounds like you have a power regulator problem with the main power supply, because it sounds like the voltage is low and causeing the set to have a smaller then normal picture. Check the Main B+ first. I dont have a schematic but if you need, I know lots pof authorized pioneer peeps, and can getbwhat voltage and what part is most likly bad. We hardly repaired the boards as they(pioneer ) did not have most of the descrete parts and mostly had the boards themselfs to replace. You could also take out the B+ regulator board and have it rebuilt at PTS. They have a web addy of Look them up and get their tele # and call them to see about the replacement cost. If they can't help go here Main support number800-421-1606. Good Luck

Posted on Jul 27, 2006


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