[TechAssist] Re: SONY kv-27xbrr15 fast shutdown

Check this also.....There is one plug on the power supply board that feeds 
B+ to the audio area.  You will read a dead short on this line if this zener 
is shorted.

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Text pasted from WinSTIPS 2.0
http://www.ServiceSoftware.com
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SONY   KV27XBR25

Shutdown On Power Up. Must Unplug To Reset

Bryn Mawr Tv

Shorted D1409  (Rd39es-B4) In Audio Section "A" Cba
Caused By Bad Solder Connections On Ic651 "G" Cba  (Power Supply)


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==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)
jstielau@xxxxxxxx
========================

----- Original Message ----- 
From: "Leonard Caillouet" <lcaillo@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, December 29, 2004 8:18 AM
Subject: [TechAssist] Re: SONY kv-27xbrr15 fast shutdown


> Bad regulator?  Got one in the shop right now that loses regulation almost
> immediately, B+ starts OK, then goes up and set shuts down.  Had a bunch 
> of
> bad caps in the PS and the regulator IC was bad.  Try running it at a 
> lower
> line voltage and see if it stays up with the B+ at 135v.
>
> Also, audio amp problems will shut it down.  Disconnect the supply to the
> audio to test.
>
> Pin amp and the related op amp will cause shutdown.
>
> Bad solder joints all over the place in the deflection circuits and PS 
> will
> shut it down.
>
> Leonard Caillouet
> Electronics World
> 1261 NW 76 Blvd
> Gainesville, FL 32606
> 352-332-5608
> FAX 352-332-5668
>
> ----- Original Message ----- 
> From: "becyn" <becyn@xxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, December 28, 2004 7:54 PM
> Subject: [TechAssist] SONY kv-27xbrr15 fast shutdown
>
>
> Hello all,
>
> I checked the tips database, but nothing fits.
> This puppy has hv , but shuts down abnormally fast- about1 second.
> It seems to be too fast for a deflection scenario shutdown (I scoped v
> deflection-seemed to be there). I thought perhaps
> a marginal fbt drawing too much current from the SMPS? SMPS overcurrent
> shutdown???
> There is no flashing light, or delay if I  attempt to power-up again as
> would be the case
> with a  micro or x-ray shutdown (hv=25kv).
>
> Whadduyathink?
>
> Jim McVey
> McVey Alltronix
> 327 Broadway
> Newburgh N.Y. 12550
>
> *NOT* a NESDA member
> Factory authorized
> service for over 20
> major brands.
> 845 561 8383
>
>
>
>
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