[TechAssist] Re: Mitsubishi VS411R (blows F8A0 instantly)
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 15 Jan 2004 18:01:17 -0500
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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