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Hitachi 27GX01B I have a Hitachi 27GX01B bought it new in 2002, I now have all the telltale symptoms of a bad Pump up cap, I can provide schematics, if some body can point out the offending caps number {c????} I am fully aware of the 50Kv in there, and the danger involved, and know what im doing, just not too sure which cap it is. I have the PDF schematics, or they can be downloaded here, "Its in 3 parts" not sure why.

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  • Christopher Peckham
    Christopher Peckham Nov 22, 2007

    it seems that sometimes when you click the above link it can dl part3 and not take you to the page if thats the case then here are all 3 parts NOTE you need all 3 parts before you extract, its a multipart file, the 3 files unzip into a single PDF document, which is the service manual and has a complete circuit diagram at the end, Im trying to learn and would very much like to know how to identify the pump up capacitor on the vertical output circuit,"which one is it". Thank you, Please help.

  • Christopher Peckham
    Christopher Peckham Nov 27, 2007

    thank you so very friggin much, great!!!!! :)

    P.S. it was c454 FYI

  • Christopher Peckham
    Christopher Peckham Nov 28, 2007

    Been on for 36 hours straight, picture is perfect, hasn't been this good in a long time, I had a compression problem at the top of the screen "credits compressing as they get to the top of the screen" for a couple of years, only had the white lines for a month or so, but it fixed both problems, im very happy, again Thank You. :)



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Check c458; (100/16) c454; (220/35) c453; (470/35); c451 (2.2/50) all are electrolytic capacitors located near IC 451 (la7845) If you have an ESR meter it would help out greatly to identify the weak cap or caps.

Posted on Nov 25, 2007

  • Anthony Wilson Nov 30, 2007

    Glad I could help. The picture of your symptom was helpful in diagnosing the problem. I wish more people would attach a photo when they have a video issue. Thank you.



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