[TechAssist] Re: Mitsubishi VS411R (blows F8A0 instantly)
- From: <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 15 Jan 2004 17:54:45 -0500
Bob,
From Tech Repair CD:
MITSUBISHI\VS402R\Unstable Convergence\\\\Check F8a0 And F8a1 For Open
Condition And R8j7 Running Hot.
Suspect Shorted Ic8a0\ Located On Pcb-Convergence. (266p38401)\\\\\\\
MGA\VS507\NO RASTER* NO SOUND* F8A0 & F8A1 FUSES OPEN* WILL DISPLAY\INTERNAL
GENERATED CROSS HAIR
PATTERN.\\\REPLACE FUSES F8A0 & F8A1 & CHECK TO SEE THAT Q8C2*Q8C3*Q8C5\AND
Q8C6 ARE NOT TOO CLOSE TO THE
RAISED EDGE OF THE\METAL SUPPORT RAIL EXTENDING FROM ONE SIDE OF THE
CABINET.\THIS IS DUE TO A WEIGHT
BEING PLACED ON THE VCR SHELF.\\\\\
Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
To: "Techassist" <techassist@xxxxxxxxxxxxx>
Sent: Thursday, January 15, 2004 2:40 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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