[TechAssist] Re: Subject: Zenith SL2784 (1994) No Start, blown H.O.T.
- From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 8 Oct 2002 09:59:23 -0400
John you are right about the fuse size. On the board it shows 2 amp.
Checking the old fuse showed your numbers. The power supply seems to be
running OK must have been using wrong ground originally, I am not sure about
the horiz drive. Checking the horiz section with my Sencore TVA92 shows a
problem.(HOT drawing to much current). If I disconnect the yoke and
re-check, it is good. I replaced yoke with a used stock unit with the same
results, (horiz section loaded down). still could be flyback problem, . The
set will not start even with yoke disconnected so could be quick shutdown or
no drive pulse to H.O.T.
thanks
Bruce.
----- Original Message -----
From: "John Mielke" <maintv2002@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, October 07, 2002 5:10 PM
Subject: [TechAssist] Re: Subject: Zenith SL2784 (1994) No Start, blown
H.O.T.
>
> Hello. That module is in Sams 3482 although the model number is not
> listed. That set uses 2 power supplies, QX3401 runs always and QX3402
> runs when the set comes on. Both are contolled by IC3401. RX3434
> (56K-1w) supplies start up v. I do not see a 2 amp fuse in this set,
> FX3401 (AC fuse) should be 4A, FX3403 (to the horiz. output) should be
> 3A and FX3402 should be 4 amp soldered-in. ICX3405 (optocoupler) sends
> to on/off signal to IC3401.
> This chassis is a prettty good set and they have a differt picture tube
> than the ones that normally short and cause problems in the power supply
> Hope this helps, John.
>
> Bruce Tiedeman wrote:
> > Help needed,
> >
> >
> >>Zenith SL2784BT (9-1268) Print ? Part information?.Needed. Audio
working,
> >>no H.V.
> >
> >
> >>Does any one have a print to loan on this 9-1268 module. Flyback rings
> >
> > good?
> >
> >>I have 157 B+ .The Regulator circuit does not seem to be working
properly.
> >>This set had both 2 amp fuses blown. and H.O.T blown. Replaced blown
parts
> >
> > ,
> >
> >>audio only working, will not start.
> >>Soldered poor connections on sweep board. The picture tube probably
caused
> >>the output to go and damaged the regulator circuit. The regulator does
not
> >>seem to be turned on , very distorted waveform. Multiple problems may
not
> >
> > be
> >
> >>worth repairing, or buying print. Picture tube still questionable.
> >>thanks for any information,
> >>Bruce.
> >>
> >>B&T Electronics
> >>139 Margaret St
> >>Sarnia Ontario
> >>Canada
> >>N7T 2Y3
> >>(519) 344-1850
> >>btied@xxxxxxxxxxxx
> >
> >
> >
> > ------------------------------------------
> > To REMOVE your email address, click here:
> > http://www.tech-assist.org/unsubb.html
> > To CHANGE your email address, click here:
> > http://www.techassist.net/forms/change.html
> > ------------------------------------------
> > ***NEW*** Tips Added Instantly!!!***
> > Submit Repair Tips here:
> > http://www.tech-assist.org/secure/tip/
> >
> >
>
>
> --
> John Mielke
> Main TV
> Longmont,Co
> 303 776 6955
> maintv2002@xxxxxxxxxxxxx
>
>
> ------------------------------------------
> To REMOVE your email address, click here:
> http://www.tech-assist.org/unsubb.html
> To CHANGE your email address, click here:
> http://www.techassist.net/forms/change.html
> ------------------------------------------
> ***NEW*** Tips Added Instantly!!!***
> Submit Repair Tips here:
> http://www.tech-assist.org/secure/tip/
>
------------------------------------------
To REMOVE your email address, click here:
http://www.tech-assist.org/unsubb.html
To CHANGE your email address, click here:
http://www.techassist.net/forms/change.html
------------------------------------------
***NEW*** Tips Added Instantly!!!***
Submit Repair Tips here:
http://www.tech-assist.org/secure/tip/
Other related posts:
