[TechAssist] Re: SONY kv-27xbrr15 fast shutdown
- From: "Shoreline Electronics" <jstielau@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 29 Dec 2004 08:58:52 -0500
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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