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    Moderated By: claudio
    Agoraquest Forum Index Television Troubleshooting
      
    ---Jehill, need you advice--- Dashboard
    Replies: 18 | Views: 5,442
    Last Reply: June 10, 2009, 6:37 am

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    jehill | BobF | Ra | Baethe | aprd6289 | mbt_junkyard |
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    Author ---Jehill, need you advice---
    BobF

    Rank: Sonyphile


    Joined: Feb 17, 2004
    Posts: 643
    From:

      Posted: 2007-08-29 15:50






    On 2007-08-29 15:45, Baethe wrote:
    another diode, (but repair guys were not specific as to which one).





    Thanks for the update.  Hopefully, there's not some other problem that's causing the diode failures.

    Best of luck with the repaired set!

    Bob


       


    aprd6289
    Premium Member

    Rank: Sony Fan


    Joined: Sep 04, 2008
    Posts: 4
    From: USA

      Posted: 2009-06-10 04:03

    9-blink problem on a Sony KV-32FS320

    From what I read, I need to check out the solder joints on the power board, and diodes D640, D641, D646 and Q690. Is that about right?

    How dangerous is this? Is there a shock risk?





    Start out by unplugging the set and discharging the HV from the picture tube to the chassis.  Then, look for large electrolytic capacitors and make sure that they are discharged.  Its best not to use a direct short.  A 10 ohm, 5 watt resistor should work just fine.

    For the KV27FS320, KV32FS120, KV32FS320, KV36FS120 and KV36FS320, 9 blinks, pause, 9 blinks means that there is a problem with the ZCD (zero crossing detector) circuitry.  There is a service bulletin for the issue.  If you would like a copy, go to your Inbox at the bottom of the left column and send me (jehill) a private message (PM) with your request.  Be sure to include your email address!





    Start out by unplugging the set and discharging the HV from the picture tube to the chassis.  Then, look for large electrolytic capacitors and make sure that they are discharged.  Its best not to use a direct short.  A 10 ohm, 5 watt resistor should work just fine.





    How exactly do you discharge the High Voltage from the picture tube to the chassis?

    How do you identify/locate the large electrolytic capacitors?

    What do you use to hold the resistor while discharging the capacitors? 





    How exactly do you discharge the High Voltage from the picture tube to the chassis?  Connect one end of the ground wire with series resistor to the chassis and the other to a flat blade screwdrier.  Then, lift the cap on the CRT and slip the screwdriver under the cap to discharge the CRT.

    How do you identify/locate the large electrolytic capacitors?  Look for large tubular objects.  The connections are on the bottom of the board.

    What do you use to hold the resistor while discharging the capacitors?  Its best to prepare a ground wire in advance and push insulated tubinf over the connection.





    GO HERE. http://riddledtv.com/repair/journal/DischargeCRT/index.html



         
    aprd6289
    Premium Member

    Rank: Sony Fan


    Joined: Sep 04, 2008
    Posts: 4
    From: USA

      Posted: 2009-06-10 04:12

    I edited the info on discharging the electricity without killing oneself and included the link that gives full detailed instructions with photos I love my KV-32FS120, but it ain't to die for!!!


    -----------------
    For tv troubleshooting package, Private Message claudio or jehill w/email and what package you need.

    Package Title/Applicability:

    (9 Blinks, ZCD/KV27FS320, KV32FS120, KV32FS320, KV36FS120, KV36FS320)

    [ This message was edited by: aprd6289 on 2009-06-10 04:18 ]


         
    mbt_junkyard

    Rank: Sonyphile


    Joined: Sep 15, 2008
    Posts: 661
    From: EU

      Posted: 2009-06-10 06:37

    Almost (!) all newer Trinitron tubes use two pairs of electrostatical plates to achieve horizontal static convergence. The voltage difference between both plates causes the red and blue beams to converge or to diverge. The only external component is a variable resistor, marked H-STAT. This potentiometer, together with a resistor which is inside the CRT, will cause the high tension of the anode to "bleed" away. For that reason a Trinitron tube is discharged automatically within 20 seconds after switch off, so no additional discharging is necessary.
      
    Note: This only works as long as the CRT-socket is connected and the internal resistor of the CRT is not broken, which happens in very, very rare situations. Also some 16" and 20" Sony tubes does not have a "real" Trinitron gun, but use a Philips gun with magnetic horizontal static convergence. These tubes must be discharged manually!

    [ This message was edited by: mbt_junkyard on 2009-06-10 13:47 ]


       
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