Re: GVC M1566P monitor pulsing power supply.

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#1071

From: Alan Liefting
Date: Mon, 18 Mar 2002 22:24

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I am almost 100% sure that it is a PSU fault.  The monitor will work
occasionally.  The EHT is coming up.  The PSU control ic is not shutting
down due to overcurrent.  There is an additional bit of circuitry that
controls the 3842 chip.  I think it is for power save.  I am sure that
this is the area where the fault is.

Alan Liefting

Rudolf Ladyzhenskii wrote:
> 
> Check horizontal circuitry.
> 
> Rudolf
> 
> "Alan Liefting" <aliefting@ihug.co.nz> wrote in message
> news:3C965925.4A3EA9E4@ihug.co.nz...
> > Hello All,
> >
> > I have the above monitor which is pulsing.  The power supply is coming
> > up and shutting down a couple of times per second.  It is definitely a
> > power supply fault.  Voltage control is done on primary.  Disconnected
> > optocoupler which is for power supply standby.  Still no difference.
> > Replaced control capacitor.  No difference.  Replaced opto and UC3842
> > control ic.  Still no difference.  Replaced a capacitor in an obscure
> > bit of circuitry and came right.  Monitor then failed on test!
> >
> > FCC ID DK4M1566
> >
> > HELP??!!
> >
> > Alan Liefting

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From: Alan Liefting <aliefting@ihug.co.nz>
Newsgroups: sci.electronics.repair,aus.electronics
Subject: Re: GVC M1566P monitor pulsing power supply.
Date: Tue, 19 Mar 2002 10:24:45 +1200
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