[TechAssist] Re: Mitsubishi VS411R (blows F8A0 instantly)
- From: <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 15 Jan 2004 17:31:41 -0600
The only thing I remember there were some small transistors on that
convergence board that would short.
but you said no parts found bad
I believe that +20volts is for the STK's
you may still have a shorted convergence winding
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
Dallas, TX
----- Original Message -----
From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, January 15, 2004 5:01 PM
Subject: [TechAssist] Re: Mitsubishi VS411R (blows F8A0 instantly)
> This is NOT the typical deflection yoke failure we are accustomed to that
> blows the 1.6 amp fuse and/or the IC protector on the deflection board
> (those are easy to diagnose using a method I developed). The fuse I have
> blowing is on the 20 volt supply on the convergence board. Deflection is
> full on this set but there is no convergence control due to the missing
+20
> volts. This one is a much different animal.
>
> Bob Waterman, CET® #RI-28
> Master Technician License #9109
> Service Manager / Parts Manager
> Gemini Computer, TV, & Security Alarms
> (508)695-7302
> (508)695-7769 FAX
> geminitv@xxxxxxxxxxxxxxxx
> geminitv@xxxxxxx
> www.geminicomputertvsecurityalarms.com
>
>
> ----- Original Message -----
> From: <tvservice@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, January 15, 2004 5:22 PM
> Subject: [TechAssist] Re: Mitsubishi VS411R (blows F8A0 instantly)
>
>
> > Probably yokes
> > remove the suspected yoke and look inside for green and black corrosion
> > Robert
> > tvservice@xxxxxxxxxxxxx
> > H & H Electronics Inc
> > Dallas, TX
> >
> > ----- Original Message -----
> > From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
> > To: "Techassist" <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, January 15, 2004 1:40 PM
> > Subject: [TechAssist] Mitsubishi VS411R (blows F8A0 instantly)
> >
> >
> > > I have a Mitsubishi VS411R (still in the customer's home) that the
> > customer
> > > complaint is that the picture was intermittenly jittering and bouncing
> for
> > > about a week with convergence separation, then the jitter stopped and
> the
> > > convergence was still out and was completely unresponsive to the
> customer
> > > convergence adjustments. I walked in to his home with new STK4274's
and
> > > found that the 1.6 amp fuse (F8A0) was blackened and of course open.
> This
> > > fuse is for the +20 volt supply. The -20 volts was fine. I replaced
the
> > STKs
> > > and the fuse and within 2 seconds the fuse opens. I can find no
obvious
> > > shorts or loads so I also replaced the STK4275 focus IC which also
uses
> > this
> > > supply and still have the same conditions. If I remove either
connector
> > "VY"
> > > or "VU" from the convergence board individually, the fuse does not
blow
> > but
> > > the resistors R8K6 and R8L2 (for connector "VY") or R8J7 and R8K3 (for
> > > connector "VU") will start cooking really quick due to no load. I do
not
> > > have the service manual so I called Mitsubishi Tech Assist from the
> > > customer's home because I suspect either the red or blue yoke (part#
> > > 330P116010 which is NLA) might be the culprit but I had no way to tell
> > which
> > > if either was it and Mitsubishi had no reports of this symptom and
were
> at
> > a
> > > loss of what else it could be or how to check the yokes. Before I
> condemn
> > > the set, I figured I would ask if anyone has encountered this
previously
> > as
> > > you all know I hate to concede defeat!
> > >
> > > Bob Waterman, CET® #RI-28
> > > Master Technician License #9109
> > > Service Manager / Parts Manager
> > > Gemini Computer, TV, & Security Alarms
> > > (508)695-7302
> > > (508)695-7769 FAX
> > > geminitv@xxxxxxxxxxxxxxxx
> > > geminitv@xxxxxxx
> > > www.geminicomputertvsecurityalarms.com
> > >
> >
>
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