[TechAssist] Re: Westinghouse TV, Model WTV12505, Shutdown
- From: "Don Hartigan" <hartstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 13 Nov 2001 13:55:20 -0400
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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