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Zienth Vertical Squish (How do I find and test the Capacitor?)

Discussion in 'Electronic Repair' started by Kevin Cornwell, Aug 20, 2003.

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  1. I have read Sam's FAQ and found that the problem is the vertical capacitor.
    Is the cap on the circuit board on the "delicate" end of the picture tube?
    I see one blue cap and I tested it with my fluke and it reads 6.4 (cold) and
    the value printed on the cap is 4.7. BTW, the TV picture is not as squished
    once the TV is warm. Is this the right cap to test? I tested the
    capacitance by finding the solder points on the opposite side of the board
    and placed my leads there. Is this the right way to test it? Or do I have
    to remove it from the board for isolation reasons?

    Thanks in advance!
    Kevin

    Model Number: SJ2775BG
    Serial Number: 191-43290769

    PS- If this in fact the problem, where would you guys recommed I get a
    replacement cap?
     
  2. Suggest you get a qualified service technician to service the set.
     
  3. Ok... Pulled out a Nichicon 4.7uf 315v 105 C capacitor (H9112) and it
    tested bad. Any recommendations on where to find a replacement? How
    critical is the voltage for match up purposes? I cannot find this
    particular unit. In fact the closest I could find was a 4.7uf 400v. Help
    please... :)
    Kevin
     
  4. Thanks Sam. I appreciate the informative response. (great web site too!)
    Kevin
     
  5. That would be fine. The 105 degree C would be desirable though.

    In general, an electrolytic cap can be replaced with one that is modestly
    higher without any problems as long as it fits. I wouldn't go 10 times
    higher but up to at least 2X is OK.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the Feedback Form at repairfaq.org. Thanks.
     
  6. P.S. I do assume it's a normal polarized electrolytic. If by chance
    it's a non-polarized cap, then a non-polarized replacement must be used.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the Feedback Form at repairfaq.org. Thanks.
     
  7. The cap I tested was ok afterall. Just a bit higher microfarad than what is
    printed (4.7 vs 5.8). I would like to test the cap(s) on the vertical
    output IC however I don't know exactly which IC I should be looking for. Is
    this part of the main board or is it one of the smaller ones? Is there some
    landmark that gives it away? Is there a website that has components
    visually marked out?
    Thanks again...
     
  8. The cap I tested was ok afterall. Just a bit higher microfarad than what
    is
     
  9. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    The following is 2 conversations with Donal Percival and myself. With
    Donalds help I was able to fix my vertical squish problem. If anyone
    needs the service schematics for a Zenith Model Number: SJ2775BG, send
    me a note.
    ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    Ø > > > > replacement cap?




    +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    Other email conversation with Donald:
    ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

    Yes a bad cap will cause your squish problem, and no I do not sell
    parts.
    Sorry I did not get
    back to you earllier to tell you this info.
    Donald

    ----- Original Message -----
    From: "Kevin Cornwell" <>
    To: "Donald Percival" <@>
    Sent: Wednesday, September 03, 2003 9:12 PM
    Subject: RE: Zienth Vertical Squish (How do I find and test the
    Capacitor?)

     
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