[TechAssist] Re: Sylvania(Funai) WSSC192 combo..33v zener shorts
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 25 Sep 2004 01:21:39 -0400
Jeff, what about something unusual such as leakage between primary and
secondary of the SMPS transformer? Does the 33V zener blow instantly or
is there enough time to do measurements? Is the 33V rectifier
installed backwards by any chance?
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Intrepid Video Support wrote:
> Thanks Peggs...
> I checked continuity on all the traces and pulled back the coating..all is
> fine in that area.
> Jeff
> --
> Intrepid Video TV/VCR Repair
> 263 S Front St, Steelton PA 17113
> 717-939-7708; (F) 717-564-4952
> www.intrepid-video.com www.tech-repair.net
> ----- Original Message -----
> From: "peggs" <peggs@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>; "Techassist" <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, September 22, 2004 11:36 AM
> Subject: [TechAssist] Re: Sylvania(Funai) WSSC192 combo..33v zener shorts
>
>
> If there is a mounting screw near the opto,check the pcb for a crack at the
> screw.
> capstan motor are bad in many of these as well,it pulls the 12v supply down
>
> Peggs
>
> At 06:27 PM 9/21/04, Intrepid Video Support wrote:
>
>
>
>>Set came in dead, with a squeal.
>>Replaced D615(33v), Q605, Q606(Shorted) R566, high in value, D629
>>(1N4148..shorted) and I replaced the
>>opto..all diodes and transistors shorted again.
>>I replaced again, this time replacing Q604..33v zener shorted again.
>>I checked D621, D609, D616, 617, 613, the 10 ohm resistor R654.
>>Evidently I'm missing something..and losing on a job that should have been
>>a quick fix..
>>Can anyone offer any help?
>>Thanks.
>>Jeff
>>--
>>Intrepid Video TV/VCR Repair
>>263 S Front St, Steelton PA 17113
>>717-939-7708; (F) 717-564-4952
>>www.intrepid-video.com www.tech-repair.net
>>
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