[TechAssist] Re: Zenith module# 9-1426 power supply problem
- From: "Jonas Miglinas" <miglinasj@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 16 Oct 2001 17:34:40 -0500
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
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