[TechAssist] Re: Magnasonic MCT5301 14" - Dead. No relay click. Shorting relay brings on raster only.
- From: gulftech@xxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 30 Apr 2004 07:27:23 -0500
David,
Besides the tip Gary listed, I found this on a similar model: Check
R610, 1.8K, 5 wt for increase in value. BTW, replace D602 & D603 with
NTE125. Diodes may check good, but replace them anyway.
Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL 32563
850-934-8324 (Voice) 850-932-0819 (Fax)
On Thu, 29 Apr 2004 23:28:33 -0400 Gary McCartney <gary@xxxxxxxxxxx>
writes:
> Does the 5V regulator run hot in standby? If it is a 7805 regulator, I
> would change it first. Those have a permissable output of 4.75V to
> 5.25V. 4.2V is too low. If it's not the regulator itself, then try to
> remove loads until the voltage goes back up to 5V. Might also be a
> filter cap open. What is the input voltage of the regulator on pin
> 1? I
> think I remember it has to be at least 1.5V higher than the output
> voltage, so you'd need at least 6.5V of well filtered dc on the
> input.
>
> I just found a tip for this model:
>
>
> TELEVISION MAGNASONIC MCT5301 DEAD- REPLACE D602, D603
>
>
> Hope this helps.
>
>
>
>
>
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
>
>
>
> David Lessard wrote:
> >
> > Dead. No relay click. Shorting relay brings on raster only. Then I
> can
> > press the ON button and everything works fine. I can turn TV ON
> and OFF
> > then ON again so long as I do this within a few seconds. Output
> voltage
> > at IC602 is only 4.2VDC in standby but when relay is shorted
> voltage is
> > normal at 5VDC. There is a tip in the Euras database
> >
>
http://www.euras.com/repair_tips_1/Magnasonic/MCT5301/MCT5301_Magnasonic
> > .htm on this problem but I'm not subscribed to them. Any help
> would be
> > greatly appreciated; I've spent a little too much time on this 14"
> set
> > already and would like to recover at least some of my lost time.
> >
> >
> > As always, thanks in advance.
> >
> >
> >
> > David Lessard
> >
> > Alexandria Electronics
> >
> > 50 Harrison Street
> >
> > P.O. Box 1366
> >
> > Alexandria, Ontario.
> >
> > Canada
> >
> > K0C-1A0
> >
> > mr_fixit@xxxxxxxxxxxx
> >
> >
> >
> >
>
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