[TechAssist] Re: Sharp VCR VC-H972U - SMPS Dead
- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 25 Aug 2004 10:13:13 +0100
I'm going to need a scan of the SMPS to figure this one out. Can anyone
oblige? Thank-you.
David Lessard
Alexandria, Ontario. Canada
mr_fixit@xxxxxxxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Edward Gaidies
Sent: Wednesday, August 25, 2004 1:14 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Sharp VCR VC-H972U - SMPS Dead
Yup..I feel the same way. I guess I better get educated on these, looks
like they are going to be around for a while. Got a couple of Toshiba's
on the bench, as we speak. Problem in SMPS.
-Ed-
Ed Gaidies
Tel-Tek Electronics
Ontario-Canada
teltek3@xxxxxxxxxxxx
On 24-Aug-04, at 3:11 PM, David Lessard wrote:
> Hi Techs,
>
>
> Let me be the first to tell you all that I really haven't had great
> luck
> repairing SMPS's lately. VCR came in dead, apparently after a hydro
> outage, when the power came back on primaries on two other appliances
> were open and this VCR's SMPS was dead. Fuse was blown, main switching
> transistor and driver transistors on the primary are OK yet the fuse
> blows on AC plug-in. I've checked ALL diodes and transistors,
> everything
> tests OK. Base of the main switching transistor has .7VDC on it all
the
> time, so this transistor is "ON" all the time, hence the blowing fuse.
> I
> need more information on these SMPS's, I.e. Where do the switching
> pulses derive from? If anyone has a schematic on this SMPS, please
send
> it along.
>
>
>
> Thank-you
>
>
>
> David Lessard
>
> Alexandria, Ontario. Canada
>
> mr_fixit@xxxxxxxxxxxx
>
>
>
>
>
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