[TechAssist] Re: Zenith module# 9-1426 power supply problem
- From: Mike Barnett <passthecash@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 17 Oct 2001 09:30:12 -0700 (PDT)
Thanks guys for the info. After carful review and consideration i sent this
unit out yesterday, as the original problem has been addressed and
rectified. We'll see what happens.
Thanks again, i'll add all suggestions to my database.
On Tue, 16 Oct 2001 17:34:40 -0500, techassist@xxxxxxxxxxxxx wrote:
>
> Does the squeel change pitch if you press on the board ?
> If so, press on any coil or transformer and try to isolate which one is
> "singing". then unsolder the culprit,(loosen it completely) then put
> pressure on it when you resolder it back. this works for me on other
> chassis.
> Jonas
> ----- Original Message -----
> From: "Mike Barnett" <passthecash@xxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, October 16, 2001 1:39 PM
> Subject: [TechAssist] Re: Zenith module# 9-1426 power supply problem
>
>
> >
> > The transisor they refer to is qx3401//IRF830=nte2398. I replaced this,
> the
> > squeel has lowered in noise but is still noticable. Not sure what else
to
> > do. I guess it's time to send it home.
> > If anyone has a good resalution to this problem please post.
> >
> > Thanks
> > Mike
> >
> >
> >
> >
> > On Mon, 15 Oct 2001 21:27:02 -0600, techassist@xxxxxxxxxxxxx wrote:
> >
> > >
> > > I also had one of these repaired by PTS and it has a squeel in
standby
> I
> > > never found the problem but PTS said its a bad transistor near the
back
> > left
> > > corner of the module that has a heat sink attached to it the
transistor
> > was
> > > out of sink with the coil it goes to it worked fine just squeeled in
> > > standby.
> > > ----- Original Message -----
> > > From: "Mike Barnett" <passthecash@xxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Monday, October 15, 2001 12:02 PM
> > > Subject: [TechAssist] Zenith module# 9-1426 power supply problem
> > >
> > >
> > > >
> > > > This unit came in with horizonal retrace lines and no video,
Checked
> > video
> > > > out transistors on crt board and found only 12vdc on collector.
> > > > replaced rx3277/2.7ohm 1/2 watt resistor. This took care of the
> > problem.
> > > The
> > > > set works fine exept for squeel coming from qx3401 when set is in
> > stanby.
> > > I
> > > > checked all caps in this caps in this curcuit, all are fine.
Anyone
> > know
> > > > what might be causing this device to squeel?
> > > >
> > > > TIA,
> > > > Mike
> > > >
> > > >
> > > >
> > > > Get It Fixed At
> > > > Rochester Electronics
> > > > 630 West Ridge Rd.
> > > > Rochester, NY 14615
> > > > 716.663.6870
> > > > www.RochesterElectronicsRepair.com
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > _______________________________________________________
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> >
> >
> > Get It Fixed At
> > Rochester Electronics
> > 630 West Ridge Rd.
> > Rochester, NY 14615
> > 716.663.6870
> > www.RochesterElectronicsRepair.com
> >
> >
> >
> >
> >
> > _______________________________________________________
> > Send a cool gift with your E-Card
> > http://www.bluemountain.com/giftcenter/
> >
> >
> > Help make your TechAssist online repair tips
> > database better! Submit your fixes here:
> > http://www.circuitwork.com/techassist/tip/#tips
> > To unsubscribe write to:
> > techassist-request@xxxxxxxxxxxxx
> > with unsubscribe in the subject line.
>
> Help make your TechAssist online repair tips
> database better! Submit your fixes here:
> http://www.circuitwork.com/techassist/tip/#tips
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> techassist-request@xxxxxxxxxxxxx
> with unsubscribe in the subject line.
Get It Fixed At
Rochester Electronics
630 West Ridge Rd.
Rochester, NY 14615
716.663.6870
www.RochesterElectronicsRepair.com
_______________________________________________________
Send a cool gift with your E-Card
http://www.bluemountain.com/giftcenter/
Help make your TechAssist online repair tips
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