[TechAssist] Re: FIXED Pioneer SD-P4691,hissing noise and horizontal lines in picture
- From: Kevin <kevintv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 12 May 2004 00:54:06 -0700
C129, a 470uF @ 200 volt capacitor in the P/S had a bad connection on
the positive leg. This cap is right next to the flyback and 1 inch from
the transformer that was making all the noise. I think I need new
glasses as I don't know how I missed it the first time!
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Kevin
Sent: Sunday, May 02, 2004 2:02 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: UPDATE Pioneer SD-P4691, hissing noise and
horizontal lines in picture
Upon further testing I found that if I whacked a "coupling" transformer
in the P/S that the noise and lines in the picture disappeared, only to
return after a few seconds. This happened twice only. Then using a
rubber hose as a stethoscope, I found that the noise was not coming from
the coupling transformer, but was coming from another transformer in the
P/S, the switching transformer. Could a transformer fail in this way?
I am more suspicious of a faulty transistor or other component with a
bad internal connection. Anyone seen this type of problem before?
Thanks.
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of al m
Sent: Saturday, April 24, 2004 8:43 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Pioneer SD-P4691, hissing noise and horizontal
lines in picture
Nope it'll go right to ground. Don't hold the steel part. (laughs).
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "Kevin" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, April 24, 2004 10:42 PM
Subject: [TechAssist] Re: Pioneer SD-P4691, hissing noise and horizontal
lines in picture
> It will find me too!
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of al m
> Sent: Saturday, April 24, 2004 6:38 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Pioneer SD-P4691, hissing noise and
horizontal
> lines in picture
>
> Ground a screw driver and stick it in. It'll find the screw driver.
> Al Marquardt
> ampm@xxxxxxx
> Al Marquardt Electronic Repair
> 206 W Main
> Girardville Pa. 17935
> ----- Original Message -----
> From: "Kevin" <kevintv@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, April 24, 2004 6:04 PM
> Subject: [TechAssist] Re: Pioneer SD-P4691, hissing noise and
horizontal
> lines in picture
>
>
> > Yes, the loud hissing is coming from flyback. Unfortunately the set
> is
> > in a very bright room and is a 15 minute drive away. I may have to
> > reinstall the main board and darken the windows somehow and look for
a
> > mild arc. Thanks.
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx
> >
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Technotronic
> > Dimensions
> > Sent: Saturday, April 24, 2004 12:20 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: Pioneer SD-P4691, hissing noise and
> horizontal
> > lines in picture
> >
> > Is the hissing coming from the flyback? Turn off the lights in the
> Room
> > and
> > see if you locate a mild arc somewhere?
> >
> > Steve Hearns
> > Technotronic Dimensions, NY [USA]
> > WWW.TECHNOTRONIC-DIMENSIONS.COM
> > 1-877-817-9885 (Voice / Fax Toll Free - US Only)
> >
> >
> > ----- Original Message -----
> > From: "Kevin" <kevintv@xxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Saturday, April 24, 2004 3:10 PM
> > Subject: [TechAssist] Re: Pioneer SD-P4691, hissing noise and
> horizontal
> > lines in picture
> >
> >
> > How can I be sure that it is the flyback? I have had similar noises
> > coming from the flyback and it was caused by other components.
> Thanks.
> >
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx=20
> > =20
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of George Johnson
> > Sent: Saturday, April 24, 2004 4:20 AM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: Pioneer SD-P4691, hissing noise and
> horizontal
> > lines in picture
> >
> > Hopefully I'm wrong, but I suspect the flyback. I come
> > across this problem whenever I fail to get the hv
> > lines seated in those RCA splitters. Leaking hv in the
> > flyback would do the same thing.=20
> > George
> > Johnson TV
> > Weatherly, PA
> > 570-427-4637
> > --- Kevin <kevintv@xxxxxxx> wrote:
> > > This Pioneer 46" projection TV has horizontal wiggly
> > > lines in the
> > > picture and a hissing noise coming from the flyback.
> > > The customer said
> > > the problem used to go away after a few minutes, but
> > > now it does it all
> > > the time. I pulled the 2 main boards and checked
> > > all caps in the
> > > horizontal and P/S circuits with no luck. This
> > > problem is similar to an
> > > early 1990's 20" Zenith that had a Venetian blind
> > > effect that I fixed
> > > before. The fix for that set was a horizontal cap
> > > off the jungle IC.
> > > Has anybody seen this type of problem before? TIA.
> > >=20
> > > Kevin Wilks
> > > Kevin's TV & Video Repair
> > > Penticton BC Canada
> > > kevintv@xxxxxxx=20
> > > =20
> > >=20
> > >=20
> > >=20
> > >
> >
>
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> > =3D=3D=3D=3D=3D
> > Johnson TV & Satellite
> > Weatherly, PA 18255
> > 570-427-4637 Voice & Fax
> >
> >
> > =09
> > =09
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