[TechAssist] Re: Zenith 27" TV - SF5729W2 - C3 - Other Problems

  • From: "George" <grndmstrg@xxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Sat, 7 Feb 2004 18:49:59 -0800

Solder, solder and then some more solder, Sounds like a few bad connections,
least to start will anyway, I suppose.

George
Afana Electronics
Moreno Valley, CA

----- Original Message ----- 
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, February 06, 2004 3:38 PM
Subject: [TechAssist] Re: Zenith 27" TV - SF5729W2 - C3 - Other Problems


> I'm giving up on this one; I'm convinced it's possessed. Now when I hit
> the power on button the TV takes upwards of 10 - 30 seconds to fire up
> yet the horizontal pulses and +B are present at the HOT. Also while this
> TV is off the audio occasionally comes on tuned to whatever channel it
> was last on, audio comes on for a few seconds then goes off then on,
> etc. These problems are too weird for me; it's time to put this aside
> unless someone has a last thought on these problems. Thanks in advance.
>
> Alexandria Electronics
> 50 Harrison Street
> Alexandria, Ontario
> K0C-1A0
>
> mr_fixit@xxxxxxxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David Lessard
> Sent: Friday, February 06, 2004 5:17 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Zenith 27" TV - SF5729W2 - C3 - Other Problems
>
> +B is very stable at 130VCD. I don't think these problems are related to
> the +B but then again what do I know; I've never worked on Zeniths
> before.
>
> David Lessard
> Alexandria Electronics
> Alexandria, Ontario
> mr_fixit@xxxxxxxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of al m
> Sent: Friday, February 06, 2004 4:36 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Zenith 27" TV - SF5729W2 - C3 - Other Problems
>
> You may need to replace the regulator IC. You don't mention what the B+
> is.
> 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: Friday, February 06, 2004 4:16 PM
> Subject: [TechAssist] Re: Zenith 27" TV - SF5729W2 - C3 - Other Problems
>
>
> > This TV is half alive and possessed. The SMPS was always working the
> > entire time and not the problem; I can see that another tech had done
> > the 3.3uf & 10uf cap replacement in the SMPS circuitry.
> >
> > A fellow tech sent me a schematic of the sweep and SMPS circuits and
> the
> > hunt was on. At first I thought I had horizontal pulses, well, at
> least
> > coming out of the jungle IC however the pre-driver transistor, the one
> > that drives the horizontal output transformer was open between the
> base
> > and emitter. I temporarily replaced that with an ECG399 (it's all I
> had)
> > and good pulses were present at the primary of the transformer but
> there
> > was little pulses (less then half a volt) at the secondary where it
> > drives the HOT, possible shorted (intermittent) secondary so I swapped
> > it with another similar one (but not the exact replacement) and the TV
> > came on, it sort of surprised me because there was a 1-2 second delay
> > after the ON button was pressed, probably caused by the
> characteristics
> > of the transformer, not really sure.
> >
> > Anyway this TV has other problems; first the picture width fluctuates
> > slightly every once and awhile. The raw +B seems to fluctuate in sync
> > with the horizontal width fluctuations. Also, and this problem is the
> > possessed part, the TV when first plugged in makes a few speaker
> noises,
> > buzzing and popping and occasionally you can hear the audio from the
> > tuned channel coming out of the speakers but the TV is not turned ON.
> > Question: When this TV is first plugged in you can hear a relay click,
> > is this normal? Then the intermittent buzzing and noises start, etc.
> >
> > Sorry for the lengthy follow-up report but I'm really trying to learn
> > more about this chassis. Thanks for all the help so far.
> >
> > David Lessard
> > Alexandria Electronics
> > 50 Harrison Street
> > Alexandria, Ontario
> > K0C-1A0
> > mr_fixit@xxxxxxxxxxxx
> >
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Intrepid Video
> > Support
> > Sent: Wednesday, February 04, 2004 6:21 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: Zenith 27" TV - SF5729W2 - C3
> >
> > David,
> > From Tech Repair CD:
> > ZENITH\SF5729S\RELAY CLICKS* WON'T POWER UP* GETS WORSE WITH
> > TIME\\\\C3407(100/25V) ON POWER PCB-BESIDE
> > LARGEST CAP\\\\\\\\
> >
> > Jeff Dougherty
> > Intrepid Video TV/VCR
> > 263 S Front St
> > Steelton PA 17113
> > fax...717-564-4952
> > www.intrepid-video.com www.tech-repair.net
> >
> > ----- 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
> >  > ---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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> > > --
> > > *****************************
> > > Bill Grabowski
> > > Triangle Appliance
> > > Kenosha,Wi 53142
> > > 262-694-6500
> > > 262-694-6523 fax
> > > bgrabowski@xxxxxxxxx
> > > *****************************
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