[TechAssist] Re: Emerson EWC1303
- From: peggs <peggs@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, techassist@xxxxxxxxxxxxx
- Date: Mon, 19 Jan 2004 11:59:07 -0800
thanks John,
it looks like you were right,these voltages are low until turn-on.
I found the Stand-by 5v at Q609.
I was not getting the Turn-on-on signal from the Micro to Q605.
The problems turned out to be with the 5v Reset at the Micro.
It is(was) .3v,should be 5v.
I forced it to reset with the All +5v,then it stayed
up(even after unplugging,and plugging back in)
After troubleshooting the Reset Transistor and components,it looks like the
Micro itself is bad.
Although it turns on now,it shuts right back off.
This is my uncle's TV.He brought it in about a month ago saying it wouldn't
turn on and a tape was stuck.I plugged it up,it fired up and it spit tape
out fine.
sent him on his merry way.
Now he brings it back and it IS dead.It was a set his son-in-law won in a
raffle.
My guess is,it was a refurb,that never got 'refurbed'.
I'm calling it a Bad Micro,got too much time in it as it is.
Peggs
At 03:11 PM 1/16/04, John at Main TV wrote:
>It sounds like the set is not turning on.. The outputs will be about
>one third normal when the TV is off. (the +115 source will be about
>42.5v) The on/off signal comes from IC301 pin 49. A common problem on
>this model is cracks of the board in the area of the photo-optic
>isolator. BTW, the service manual for this set is on the tech-assist
>members area under SC313C in case you do not have it. John.
>
>peggs wrote:
> > Another of these Funai combo units.
> > This one is about 6 months old.
> > This 13" tv/vcr combo is Dead.
> > Secondary voltages are about 1/3 of what they should be.
> > HOT is good,Fly rings good,so does Yoke.
> > Secondary rectifiers are good also.No shorts to ground on these rectifiers.
> >
> > I swapped the Opto-Isolator.This unit monitors the HOT B+,
> > for feedback thru the isolator,for regulation.It's at about 42v.
> > this 42v IS adjustable,so the feedback potentiometer is OK also.
> > I'm curious as to what voltages should be on this Isolator Primary PS
> > pins.there are 2 pins.
> >
> > I feel certain the problems are in the Primary,because lifting the
> > Secondary rectifiers
> > doesn't bring the voltages up.
> > can't find any components bad,Primary or Secondary.
> > no clues,
> > has anyone worked on one of these yet ???
> > I'll take tips on any EWC model.
> >
> > thanks
> > Peggs' Electronics
> > 1519 West 2nd Street
> > Owensboro,KY 42301
> > 270-926-4968
> > fax 270-686-7399
> > peggs@xxxxxxxxxxxxx
> >
> >
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>--
>John Mielke
>Main TV
>Longmont,Co 80501
>303 776 6955
>303 776 0792 fax
>maintv@xxxxxxxxxxx
>
>
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