[TechAssist] Re: Zenith 27" TV - SF5729W2 - C3
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 4 Feb 2004 18:09:18 -0500
Al, that's what I'm thinking too, is there a way to temporarily disable
the xray shutdown circuit so that I can test that this is the problem.
Thanks.
David Lessard
Alexandria Electronics
Alexandria, Ontario
K0C-1A0
mr_fixit@xxxxxxxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of al m
Sent: Wednesday, February 04, 2004 5:59 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Zenith 27" TV - SF5729W2 - C3
David I think the B+ at 140V is too high for a Zenith. Check all the
parts
in the regulator circuit, then change the regulator.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, February 04, 2004 3:34 PM
Subject: [TechAssist] Re: Zenith 27" TV - SF5729W2 - C3
> This TV is on the bench now. When first plugged in, relay clicks, then
a
> soft buzzing sound is heard from speakers. I can turn the TV off using
> the ON/OFF button on the front panel but can not turn the TV back on,
> must unplug set. I've changed the caps in the SMPS with no change. +B
in
> standby is +135V and +140V with the set turned ON. Horizontal drive
> pulses are present, +B 140V present at HOT. Occasionally while this TV
> is powered ON you can hear the audio buzz and click come and go. I
have
> no idea what is going on here. Any help would be appreciated as I
don't
> work on many Zeniths.
>
> Thanks in advance,
>
> David Lessard
> Alexandria Electronics
> Alexandria, Ontario
> K0C-1A0
> mr_fixit@xxxxxxxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Keith Trumbla
> Sent: Monday, February 02, 2004 12:50 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Zenith 27" TV - SF5729W2 - Chassis# ??
>
> Actually, those aren't that bad. There are a couple of caps in the
power
> supply that go bad. 100@35 and 3.3@50
> The relay driver transistor can fail too. It's just a regular NPN ebc
> config.
> Keith Trumbla
> BEMelectronics.com
> Suite 212-530 Century St.
> Winnipeg Canada
> R3H 0Y4
> Ph.204.775.2875 Fax.204.774-9192
> ----- Original Message -----
> From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, February 02, 2004 10:52 AM
> Subject: [TechAssist] Re: Zenith 27" TV - SF5729W2 - Chassis# ??
>
>
> > ---Good luck---
> >
> > I don't like the sounds of that, is this going to be a dog? I don't
> work
> > on many Zenith TV's around here. Does anyone have information on
this
> > chassis: dead with just a clicking relay when switched on and off.
God
> > Bless America (North and South)!
> >
> > Thanks in advance
> >
> > David Lessard
> > Alexandria Electronics
> > Alexandria, Ontario
> > K0C-1A0
> > mr_fixit@xxxxxxxxxxxx
> >
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Bill Grabowski
> > Sent: Monday, February 02, 2004 5:39 AM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: Zenith 27" TV - SF5729W2 - Chassis# ??
> >
> > It's a C3 chassis using a 9-825-01 for main and 9-822-01 for
Hor/Vert
> > sweep and SMPS........GoodLuck.......
> >
> > Bill Grabowski
> > Triangle Appliance
> >
> > David Lessard wrote:
> > > Does anyone know what the chassis number is for this model? I'm
> trying
> > > to gather some information before visiting the customer. TV is
dead,
> > > that's all I have. Are there any common problems for this model
> being
> > > dead?
> > >
> > > Thanks in advance,
> > >
> > > David Lessard
> > >
> > > Alexandria Electronics
> > > 50 Harrison Street
> > > Alexandria, Ontario
> > > K0C-1A0
> > >
> > > mr_fixit@xxxxxxxxxxxx
> > >
> > >
> > >
> >
>
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> > Triangle Appliance
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