[TechAssist] Re: Westinghouse TV, Model WTV12505, Shutdown, FIXED
- From: gulftech@xxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 14 Nov 2001 12:25:23 -0600
Friends,
I think the set is fixed. Don was right on. C404 was open. Don't know
how the set worked at all. That cap is off the primary of the driver
transformer. Just before it went out the last time yesterday, I heard a
squeal, saw a pix with the horizontal well off frequency, and then
shutdown. I am guessing now. The increased frequency caused the high
voltage to rise and go into shutdown.
This one is new to me. Many thanks to Don for help on this. I don't
know if I would have found it without help.
Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL 32561
850-934-8324 (Voice) 850-932-0819 (Fax)
----------------------
On Tue, 13 Nov 2001 13:55:20 -0400 "Don Hartigan" <hartstv@xxxxxxxxxxx>
writes:
>
> Ken;This is a DAEWOO cloneCHASS#CN2001,Mod#DTQ26,27,29S1FCN
> Change C404 =1ufd/160v,it's open probably.Replace with a 3.3/250V
> with 105
> degree C. check at D403=TP10 for 103vdc which should always be
> there.This
> tells you your power supply is working.If not check R805&R806 in
> power
> supply.ALSO a good idea to check all 800 series transistors in
> supply...hth...Don of HARTS-TVCR
> ----- Original Message -----
> From: <gulftech@xxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, November 13, 2001 1:01 PM
> Subject: [TechAssist] Westinghouse TV, Model WTV12505, Shutdown
>
>
> >
> > Friends,
> >
> > This set goes into shutdown. Trouble is, usually plays four three
> or
> > four days before failing. The set will then not turn on unless
> unplugged
> > first.
> >
> > The ONLY thing I know of that will cause this is the HV shutdown
> circuit.
> > For those without Sams 4068, the circuit is simple. Voltage
> from the
> > flyback is rectified by D405, filtered by C414, and sent through
> voltage
> > divider R414 & R415. The voltage at the junction of R414-R415 is
> fed
> > through 9.1V zener D401 to p24 of the signal processor. There is a
> > resistor RC 401 & cap C401 from p24 to ground. If the voltage at
> that
> > junction exceeds 9.1, the unit will shut down.
> >
> > Problem is the set is so darned intermittent. I monitored the
> voltage
> > applied to the zener for hours. Never found it rise above 7.4
> volts. I
> > have checked all components listed above, but changed none.
> >
> > This set is driving me crazy. Any suggestions?
> >
> > Thanks,
> >
> >
> > Ken Smith
> > Gulf Technical Services
> > 3034 Gulf Breeze Parkway
> > Gulf Breeze, FL 32561
> > 850-934-8324 (Voice) 850-932-0819 (Fax)
> >
> > ________________________________________________________________
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