[TechAssist] Re: Mag 27MS343S TV
- From: Paul <dntwntv@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 4 Nov 2005 12:34:22 -0800 (PST)
Bob
that is interesting that there is 12.7 V on D832 because that is what I
measured but the print shows it should be 50 V and there is a 100 V cap, C838
on that line. Rather confusing?
As long as there is 9V on pin 28 of IC201, it will put out a horiz drive
signal to the HOT from pin 32. The problem is finding what turns that 9V on and
off. At least that is the way I see it. It still looks like something in the
design of the power supply. You might monitor that 9V supply at that pin.
Paul
"Bob@bobsTV" <woodman17@xxxxxxxxxxx> wrote: John,
The set has a STRF6656 regulator...
Paul,
At plug in D831 140.7V D832 12.7V Taken from tuner ground..But
this set is on at plug in with raster no sound no picture..When power button
is pushed picture and sound come on and voltages stay the same..Trying to
see why vcc is not removed from horiz drive at power down.. Maybe eprom??
Bob.
Bob's TV Worcester, ma
woodman17@xxxxxxxxxxx
----- Original Message -----
From: "Paul"
To:
Sent: Thursday, November 03, 2005 9:01 PM
Subject: [TechAssist] Re: Mag 27MS343S TV
> Bob
> If you are working on that set tomorrow I would sure like to know what
voltages you have on D831 and D832 at plug in. I scoured the print and all
the info that the mfg gives which is not as much as we might like, and could
never find anything on the micro labeled power or anything to indicate what
the micro does when you turn the set on either remote or manually. I was
sure I would find something shorted but no luck.
> Paul
>
>
> "Bob@bobsTV" wrote: Paul,
> Working on same set now. Came in dead found/replaced D839,Q830
> (shorted) and IC831 (all OEM) Set now at plug in comes on with dim raster,
> if you hit power button set comes on and works ok.. if you hit power
button
> again back to dim raster will not shut off.. Going around in circles on
> this.. Had another one few months ago the B+ filter was bad..
> Bob.
>
> Bob's TV Worcester, ma
>
> woodman17@xxxxxxxxxxx
>
>
>
> ----- Original Message -----
> From: "Paul"
> To:
> Sent: Thursday, November 03, 2005 2:28 PM
> Subject: [TechAssist] Re: Mag 27MS343S TV
>
>
> > Chassis # not listed anywhere that I can see. It is in Force 32 if you
> have it on your computer.
> >
> Paul
> >
> >
> > John Conti wrote:
> > What is the chassis #
> >
> > John
> > Conti,sTV
> > Texas
> >
> >
> > >From: "John"
> > >Reply-To: techassist@xxxxxxxxxxxxx
> > >To:
> > >Subject: [TechAssist] Re: Mag 27MS343S TV
> > >Date: Wed, 2 Nov 2005 13:40:46 -0700
> > >
> > >There is no on/off switch on that power supply so it must run all the
> time
> > >but at about one-third power when the set is off. At turn on, the power
> > >comes up to normal. It is unlikely the chip is bad in this case. More
> > >likely a turn-on problem or a shorted load on the power supply. There
was
> a
> > >bulletin for "slow to turn on" but I lost that after a recent computer
> > >crash. Maybe someone else has that. John.
> > >John Mielke
> > >Main TV
> > >636 Main St
> > >Longmont, Co 80501
> > >303 776 6955
> > >303 776 0792 fax
> > >www.longmontmaintv.com
> > >maintv2004@xxxxxxxxxxx
> > >----- Original Message -----
> > >From: "Paul"
> > >To:
> > >Sent: Wednesday, November 02, 2005 11:32 AM
> > >Subject: [TechAssist] Mag 27MS343S TV
> > >
> > >
> > > > All but one secondary supply voltage is low. 140v B+ = 55v. One 12v
> > >supply
> > >is normal. Have checked all the supply lines for shorts or defective
> > >components. Have isolated each line. Nothing makes any difference. Have
> > >not
> > >changed switching I/C SFR-F6656. Not sure that the I/C is bad. Seems to
> be
> > >working. Wondering if it can work and still be bad? Thought before I
> > >replace
> > >it, maybe someone had some experience with this
> > > >
> > >Paul
> > > >
> > > >
> > > > Paul ,B
> > > > Central TV&Video
> > > > 911W Grand Ave
> > > > Grover Beach Ca.
> > > > (805)481-8084
> > > >
> > > >
> >
>
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> > Central TV&Video
> > 911W Grand Ave
> > Grover Beach Ca.
> > (805)481-8084
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> Paul ,B
> Central TV&Video
> 911W Grand Ave
> Grover Beach Ca.
> (805)481-8084
>
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Paul ,B
Central TV&Video
911W Grand Ave
Grover Beach Ca.
(805)481-8084
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