[TechAssist] Re: Sony KV27HSR10 1989 model, loss of sound

From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
To: "TechAssist" <techassist@xxxxxxxxxxxxx>
Date: Thu, 10 Oct 2002 07:33:51 -0500

Update, special note about Audio monitor out AND Variable audio output.

I found that the AUDIO MONITOR OUTPUT comes from IC 251 the stereo
demodulator IC, If that works you know the TV works up to the stereo
demodulator,  THE VARIABLE AUDIO OUTPUT LINE FEEDS THE AUDIO AMPS, if those
jacks don't work, IC 251 is bad.


Then check.......well darn, looks like I left my notes on the boss's table,
gotta order that part. Anyways audio input on the AUDIO AMPS is PIN 1, MUTE
circuit is on PINS 2 and 4 (+
voltage mutes it) and is provided by a parallel muting source ( the mute
button on the remote and the speaker button on the back)

Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815

----- Original Message -----
From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, October 09, 2002 7:51 AM
Subject: [TechAssist] Re: Sony KV27HSR10 1989 model, loss of sound


>
> Yes it does, the plug at the back of the K board will have 19 v for the
> audio outputs, the plug in closest to the rear of the chassis under neath
> will have 3-4 pins nearest the rear with a lesser voltage. I can hear the
> outputs actually hiss so I know the outputs are ok, previous repairs to
this
> model seemed to always end up on the a/v switching circuit located at the
> back board where the RCA input jacks are located. Can't tell you which
IC's
> on the U-Board to test or order, but you can isolate the problem to the
> switches if you get audio out of the Monitor out or the Variable output
> jacks, AND you hear hissing from the Audio Amps, also you may try using
the
> Inputs to see if that route produces results, either way try to bring your
> schematics and scope with you.....Oh wait a minute, you have a 27", you
> might be able to lift that into your truck. I have old folks and a 32" TV
> with wings, easier for me to quick scope the unit in the customer's home.
> Damon Brunger
> damon101@xxxxxxxxxxxxxx
> Telrad Electronic Services
> Ft Wayne, IN 46815
>
> ----- Original Message -----
> From: "kevinstv" <kevinstv@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, October 08, 2002 10:28 PM
> Subject: [TechAssist] Re: Sony KV27HSR10 1989 model, loss of sound
>
>
> >
> >
> > Damon,
> >
> > Does it have the stand-alone p/s that is upright?
> >
> > Kevin Wilks
> > Kevin's TV and Video Repair
> > Penticton BC Canada
> > kevinstv@xxxxxxx
> > ----- Original Message -----
> > From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, October 08, 2002 7:33 PM
> > Subject: [TechAssist] Re: Sony KV27HSR10 1989 model, loss of sound
> >
> >
> > >
> > > Just working on one of these units, except it's a 32". Yes, it is
> similar
> > to
> > > the KV27xbr 15. No, the unit does not use the sbx1637 module. Suspect
> the
> > > A/V switches on the U-Board, I'm presently working to isolate this,
need
> a
> > > schematic to get thru the audio switch circuitry.
> > >
> > > Damon Brunger
> > > damon101@xxxxxxxxxxxxxx
> > >
> > > ----- Original Message -----
> > > From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Tuesday, October 08, 2002 9:05 PM
> > > Subject: [TechAssist] Re: Sony KV27HSR10 1989 model, loss of sound
> > >
> > >
> > > >
> > > > Too early for that module this set simmilar to XBR common faults are
> the
> > > > regulators along the center heatsink develop bad connections, also
> > > > Pincushion problems from bad coil. the regulator connections cause a
> > mirid
> > > > of odd problems.
> > > >
> > > > Peter Oliver
> > > > Tucson Radio TV
> > > >
> > > >
> > > > From: kevinstv <kevinstv@xxxxxxx>
> > > > Reply-To: techassist@xxxxxxxxxxxxx
> > > > To: TECH-ASSIST <techassist@xxxxxxxxxxxxx>
> > > > Subject: [TechAssist] Sony KV27HSR10 1989 model, loss of sound
> > > > Date: Tue, 08 Oct 2002 18:48:19 -0700
> > > >
> > > > Sony KV27HSR10 1989 model, loss of sound
> > > >
> > > > Hi fellow techs,
> > > >
> > > > Does anyone know if this model of Sony has the SBX-1637 sound
module?
> I
> > > > have to do a service call and it would be helpful if I knew what to
> > > expect.
> > > > Thankyou.
> > > >
> > > > Kevin Wilks
> > > > Kevin's TV and Video Repair
> > > > Penticton BC Canada
> > > > kevinstv@xxxxxxx
> > > >
> > > >
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Follow-Ups:
- [TechAssist] Re: Sony KV27HSR10 1989 model, loss of sound
  - From: jorge miret

References:
- [TechAssist] Re: Sony KV27HSR10 1989 model, loss of sound
  - From: Peter oliver
- [TechAssist] Re: Sony KV27HSR10 1989 model, loss of sound
  - From: Damon
- [TechAssist] Re: Sony KV27HSR10 1989 model, loss of sound
  - From: kevinstv
- [TechAssist] Re: Sony KV27HSR10 1989 model, loss of sound
  - From: Damon

[TechAssist] Re: Sony KV27HSR10 1989 model, loss of sound

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