[TechAssist] Re: Sony KV27TW70 shuts off when I attach cable signal
- From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 8 Oct 2002 12:01:01 -0400
I have actually seen this twice in Sonys, once in a direct view and once in
a projection set. Sony tech says when you see this check +/- 15v supplies
off FBT secondary, particularly the negative and check vertical output.
Both of the sets that I fixed had -15v supply diode leaky. The projection
set had bad vert. caps and vertical IC as well.
Leonard G. Caillouet
Service Manager
Electronics World
Gainesville, FL
352-332-5608
352-332-5668 (fax)
----- Original Message -----
From: "D PANDAY" <dpanday@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, October 08, 2002 9:38 AM
Subject: [TechAssist] Re: Sony KV27TW70 shuts off when I attach cable signal
>
> Bill,
> Use AV input with colour bar. If you have the same problem,
> try reducing the brightness and picture control.
> Once AC have to be interrupt for the unit to come on again, then you are
> having a X-ray protection shut down.I do not have this model of service
> manual, however, give me the chassis number and I can give you more tips.
> Panday
>
> >From: "Wally Heise" <sirepair@xxxxxxxxxx>
> >Reply-To: techassist@xxxxxxxxxxxxx
> >To: <techassist@xxxxxxxxxxxxx>
> >Subject: [TechAssist] Re: Sony KV27TW70 shuts off when I attach cable
> >signal
> >Date: Tue, 8 Oct 2002 00:02:08 -0500
> >
> >
> >Hi Bill,
> >
> >A thought, maybe the high voltage is too high, causing it to shut down.
> >This could especially be true after changing the flyback. I'm not
familiar
> >with this set, but does it have a hv adjust pot?
> >
> >Wally Heise
> >South Isle Repair
> >Isle, Mn.
> >sirepair@ecenet
> >
> >----- Original Message -----
> >From: "Bill Grabowski" <bgrabowski@xxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Monday, October 07, 2002 10:08 PM
> >Subject: [TechAssist] Sony KV27TW70 shuts off when I attach cable signal
> >
> >
> > >
> > > I repaired this Sony's power supply and Horiz section and after
> > > completion I brought the AC up slowly and check for current on the
> > > isolation meter as always and everything was fine at full line voltage
> > > so I applied signal and within a second or two and the set went into
> > > shutdown. Would anyone have a clue if I should start at the power
supply
> > > or the Horiz section. I did replace the flyback and H.O.T. and went
over
> > > driver connections along with all solder that looked poor. I don't
> > > remember anyone having a similar problem like this with any brand. Any
> > > help would be greatly appreciated. Thanks much!!!
> > >
> > > P.S. The chassis power supply and Horiz are still working but AC has
to
> > > be interrupted and set will stay on indefinitely with out cable
signal.
> > >
> > > Bill Grabowski
> > > Triangle Appliance
> > > Kenosha,WI
> > > bgrabowski@xxxxxxxxx
> > >
> > >
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>
> Panday
>
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