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JVC horizontal lines

Discussion in 'Troubleshooting and Repair' started by wefixem, Feb 12, 2011.

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  1. wefixem

    wefixem

    6
    0
    Feb 12, 2011
    I have a JVC AV32D302 CRT television. Lately we have been experiencing horizontal lines at the top section of our screen coming down about 3 - 4 inches. The picture is fine but that section is sometimes distorted.

    I have been told it could be the vertical filter capacitors or the vertical chip but I can not identify them on the circuit board nor are they identified in the service manual or the parts manual.

    Any suggestions would be appreciated.
     
  2. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    When the vertical deflection is not quite able to recoil back up to the top of the screen fast enough (before the picture starts again) then there's usually a capacitor at fault.
    It's usually a big (2200uF) electrolytic capacitor around the vertical deflection IC/ drive. In Nokia's it could even be a small 0.1uF plastic capacitor being worn out instead.
    Please provide a link to an online manual/diagram if you are unable to locate the parts in question.
     
  3. wefixem

    wefixem

    6
    0
    Feb 12, 2011
    Thanks for the info. Any other suggestions on how to get the files to you? They are too large for this forum.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,412
    2,780
    Jan 21, 2010
  5. wefixem

    wefixem

    6
    0
    Feb 12, 2011
    I know you are trying to help and I appreciate it. The files I have are pdf and they don't seem to fit the format on imageshack. Any other suggestions?
     
  6. wefixem

    wefixem

    6
    0
    Feb 12, 2011
    Here is the link where I got the files from but they are zipped. If you hafe any trouble let me know. The parts manual, schematics and owners manual are included in this zip file. You can download and view for free.http://www.eserviceinfo.com/download.php?fileid=11175
     
  7. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    If you follow the wiring from the vertical deflection yoke (on page 7) you'll see that it leads to IC421 and C428 (2200uF 25V). Try replacing that capacitor first.
    If that doesn't cure it then try replacing C424 (100uF 35V) and C425 (470uF 35V).
     
  8. wefixem

    wefixem

    6
    0
    Feb 12, 2011
    Thank you. I will be trying this very soon and follow up with the results.
     
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,412
    2,780
    Jan 21, 2010
    That's was probably the best method :)

    For PDF files too large to upload that you can't find on the net, there is always http://pdfcast.org/

    (But I'm straying from the subject now.)
     
  10. wefixem

    wefixem

    6
    0
    Feb 12, 2011
    Thanks Steve. I will have to keep that in mind for the future.
     
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