[TechAssist] Re: Sony KV-32S20 [repeat failure]
- From: "Leonard Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 18 Aug 2004 23:20:48 -0400
Definitely use the P rank transistors.
Verify the duty cycle is 50% +/- 2%.
Check the ceramic caps.
Verify the switching freq of the circuit. I have had bad transformers cause
the timing to be off and the circuit runs at ~25kHz which is way too low and
the waveform is not clean. It will blow the transistors under this
condition.
Leonard Caillouet
Electronics World
1261 NW 76 Blvd
Gainesville, FL 32606
352-332-5608
FAX 352-332-5668
----- Original Message -----
From: "Dan Garris" <dgarris@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, August 18, 2004 10:58 PM
Subject: [TechAssist] Re: Sony KV-32S20 [repeat failure]
> What is the Sony p/n for the "G" board for this model? (I'd be interesting
> to see what Tritronics cost on the part is)
>
> Also, When set comes back in, I will install the 2SC4834"P"s so they willl
> run cooler and also the VDR in P/S and all the electrolytics near the
Horiz
> drive transformer. Since I am at home and not at the shop, I only recall
(1)
> VDR in the P/S. Are there (2) VDR's in this model? I do recall in other
> models as many as (3) but only recall (1) in this model. I'll research
more
> when I get to the shop.
>
> Garris Radio & TV
> Danny Garris
> New Bern, NC
> dgarris@xxxxxxxxxxx
> Ph: (252) 638-4477
>
>
> >From: "Shoreline Electronics" <jstielau@xxxxxxxx>
> >Reply-To: techassist@xxxxxxxxxxxxx
> >To: <techassist@xxxxxxxxxxxxx>
> >Subject: [TechAssist] Re: Sony KV-32S20 [repeat failure]
> >Date: Wed, 18 Aug 2004 22:44:14 -0400
> >
> >See if Tritronics list the G baord......for $40 bucks it will save your
> >sanity!
> >
> >==========================
> >Jeff Stielau
> >Shoreline Electronics Repair
> >344 East Main Street
> >Clinton,CT 06413
> >860-399-1861
> >860-664-3535 (fax)
> >jstielau@xxxxxxxx
> >========================
> >"If you push something hard enough it will fall over."
> >Fudd's First Law of Opposition - Sir Sidney Fudd
> >
> >
> >----- Original Message -----
> >From: "Dan Garris" <dgarris@xxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Wednesday, August 18, 2004 6:05 PM
> >Subject: [TechAssist] Re: Sony KV-32S20 [repeat failure]
> >
> >
> > > I did resolder the Horiz driver transformer, but I did not replace the
> >VDR
> > > nor the Caps in the power supply. That was exactly my next move but I
> >wanted
> > > to get some outside suggestions so when the set comes back in next
week
> >I'll
> > > know exactly what other components to replace to prevent a repeat
> >failure.
> > >
> > > Garris Radio & TV
> > > Danny Garris
> > > New Bern, NC
> > > dgarris@xxxxxxxxxxx
> > > Ph: (252) 638-4477
> > >
> > >
> > > >From: peggs <peggs@xxxxxxxxxxxxx>
> > > >Reply-To: techassist@xxxxxxxxxxxxx
> > > >To: techassist@xxxxxxxxxxxxx, techassist@xxxxxxxxxxxxx
> > > >Subject: [TechAssist] Re: Sony KV-32S20 [repeat failure]
> > > >Date: Wed, 18 Aug 2004 15:53:41 -0700
> > > >
> > > >resolder H drive tranformer
> > > >replace VDR's in Ps
> > > >replace electrolytic near H drive transformer(.47uF)
> > > >
> > > >Peggs
> > > >
> > > >At 01:23 PM 8/18/04, Danny Garris wrote:
> > > > >I repaired a dead Sony 32" KV-32S20 TV w/ Shorted Q601, Q602
> >(2SC4834)
> > > >and
> > > > >Open R607 .1ohm 1/2 W and Shorted HOT 2SC5148 (8-729-035-75).
> > > > >
> > > > >Set played fine after repair for 2 days in shop. Customer picked-up
> >set
> > > >and
> > > > >a couple days later called to say set was dead again! I found Q601,
> >Q602
> > > > >shorted and R607 Open this time. (The HOT was ok) Again Set played
> >fine
> > > >for
> > > > >two days in-shop after second repair.
> > > > >
> > > > >Customer called again a few days later and said set is dead again.
> >What
> > > >am I
> > > > >missing?
> > > > >
> > > > >Garris Radio & TV
> > > > >Danny Garris
> > > > >New Bern, NC
> > > > >dgarris@xxxxxxxxxxx
> > > > >Ph: (252) 638-4477
> > > > >
> > > > >
> > > > >
> > > >
> >
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