[TechAssist] Re: Magnasonic MCT5301 14" - Dead. No relay click. Shorting relay brings on raster only.
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 29 Apr 2004 23:28:33 -0400
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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