Question about Sony FD Trinitron WEGA XBRKV-40XBR800 40" TV

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Sony KV-40XBR800 HELP,The TV will only work if I unplug it for over night. When I watch it and turn it off it wont turn back on for 5-6 hours. It's trying to work but then it gos to standby and blinks 6 times. Thank for any help I can get. Thanks.

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  • Tibor Tancs Sep 09, 2006

    Do you have a part number for that regulator? Schematic Symble.

    Thank you.

  • sawadee Dec 09, 2007

    I have the exact problem. Unplug for 12 to 18 hours then plug it back in and it will run for ever. Turn it off and try to turn it back on and the relays click, then sometimes a loud click in audio and the system does not turn on. I get 6 blinks on the stand by light. I have the schematics in PDF format..

  • Anonymous Dec 19, 2007

    I've got the same problem.  My set has no picture or sound and the stand by light blinks 7 times then pauses when I turn it on by remote or manually.  Only until I unplug for overnight that it the picture and sound works.




    Any suggestions to fix?

  • aquiz1980 Dec 27, 2007

    what is the famous regulator problem? are you talking about IC504?

  • DoubleL Jan 03, 2008

    I have the same problem with mine.I need a schematic.Where is the regulator located?

  • rwcremer Jan 05, 2008

    I too have the KV-40XBR800 model and recently learned that my set would not power on... and observed the dreaded 6 or 7 flashing 'standby' LED. I spoke with a SONY rep and they had me unplug the set for a minute, plug it back in, and then power the unit back on to no avail. I cleaned all the dust out of the set to no avail. I tried reseating all the connections to no avail.



    For this set, since it is really heavy, I'll most likely need in-home tech support. Throwing out my back would probably cost me more than what it would take to fix the set. In any case, I learned that the flat rate for labor is $285, but does not include parts. I'm told that Sony parts are really expensive... so that's why I'm hoping to find a good blog to see if I can fix this myself. Oh, I also learned that Sony sets should only be serviced by 'apporved' Sony trained techs; this is because the special tooling and adjustments that are Sony specific.



    Well, hopefully someone can provide some insight... thanks.

  • Anonymous Feb 04, 2008

    I have the same problem. If I turn the TV off It wont turn back on. I have left it unplugged for two days and still wont come back on. I talked to a Sony repair guy and he said it was the b board (the high voltage Power Supply) this seems to be a fairly common problem has anyone ask Sony if they would foot the bill? This sounds to me like a bad part or bad design and if thats true Sony should take care of it. Anyone else agree?

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  • Master
  • 3,130 Answers

You have the famous regulator problem, or the bad regulator problem, or the cold solder connectioin is on or around the flyback transformer.

Posted on Sep 09, 2006

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