I agree with you 100% and I did try that but those resistors start to fry with either "VU" or "VY" disconnected, however, the current is not enough to blow the fuse. It does seem one of those yokes is the problem, especially considering the customer's discription of what is was doing for the week prior to it's current state. I will have to call the customer with the bad news. Funny thing is the red/blue yokes for the VS405 (which have a different part# of 330P116030) are still available from Mitsubishi.
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 [EMAIL PROTECTED] [EMAIL PROTECTED] www.geminicomputertvsecurityalarms.com ----- Original Message ----- From: "Mark Wentowski" <[EMAIL PROTECTED]> To: "ELECTRONICS PROFESSIONALS LIST" <[EMAIL PROTECTED]> Sent: Thursday, January 15, 2004 7:01 PM Subject: RE: [Techs] Mitsubishi VS411R (blows F8A0 instantly) > I've never seen a yoke with bad convergence windings but I do concur that's > what it appears to be. Perhaps you could put a 100w bulb across the fuse to > allow more "on" time and unplug the VY and VU connectors individually to try > and isolate whether the problem is with the blue or red. I thought that I'd > heard about a distributor who is providing replacement aftermarket yokes for > those sets. But it's been a number of years since I've seen one with good > tubes. No reason to get in to deep unless the customer is willing to pay big > bucks for a crappy picture. > > Mark Wentowski > Perry Hill Electronics > 3836 Harrison Rd. > Montgomery AL 36109 > phone: (334)279-5622 > fax: (334)273-9050 > [EMAIL PROTECTED] > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Gemini Computer & > TV > Sent: Thursday, January 15, 2004 1:41 PM > To: [EMAIL PROTECTED] > Subject: [Techs] 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 > [EMAIL PROTECTED] > [EMAIL PROTECTED] > www.geminicomputertvsecurityalarms.com > > 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 > [EMAIL PROTECTED] > [EMAIL PROTECTED] > www.geminicomputertvsecurityalarms.com > > > _________________________________________ > Please include original text when replying to this email. > Once you get your unit repaired, please post the fix to the group. > Order your tech repair CD today, Version 3.0 only $49.00-more monitor > tips-user friendly program. > [EMAIL PROTECTED] www.tech-repair.net > ______ > Techs mailing list > [EMAIL PROTECTED] > http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com > Go to the link above and scroll to the bottom to enter your email address > > > > _________________________________________ > Please include original text when replying to this email. > Once you get your unit repaired, please post the fix to the group. > Order your tech repair CD today, Version 3.0 only $49.00-more monitor > tips-user friendly program. > [EMAIL PROTECTED] www.tech-repair.net > ______ > Techs mailing list > [EMAIL PROTECTED] > http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com > Go to the link above and scroll to the bottom to enter your email address > _________________________________________ Please include original text when replying to this email. Once you get your unit repaired, please post the fix to the group. Order your tech repair CD today, Version 3.0 only $49.00-more monitor tips-user friendly program. [EMAIL PROTECTED] www.tech-repair.net ______ Techs mailing list [EMAIL PROTECTED] http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com Go to the link above and scroll to the bottom to enter your email address
