[TechAssist] Re: Mitsubishi VS-507CA fold-down projection TV, 1987 model, red gun flaring

  • From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Fri, 06 May 2005 16:11:31 -0400

You know a tube can be "gassey" and not low in emission. Probably age 
related.
Phil

Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx



Kevin wrote:

>I turned the red gun almost off and the flaring was still noticeable.
>Turning down the contrast and brightness had more of an effect, but made
>the picture too dark.
>
>Kevin Wilks
>Kevin's TV & Video Repair
>Penticton BC Canada
>kevintv@xxxxxxx 
> 
>
>-----Original Message-----
>From: techassist-bounce@xxxxxxxxxxxxx
>[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Phil Bader
>Sent: Friday, May 06, 2005 12:57 PM
>To: techassist@xxxxxxxxxxxxx
>Subject: [TechAssist] Re: Mitsubishi VS-507CA fold-down projection TV,
>1987 model, red gun flaring
>
>Kevin, have you tried to readjust the red screen control up or down and 
>see the reaction?
>Phil Bader
>
>Philip Bader
>Jan Phyl TV Inc. (estab. 1976)
>3420 Recker Hwy. Winter Haven, Fl. 33880
>Fax (863) 299-8821
>email: tjanphyl@xxxxxxxxxxxxxxx
>
>
>
>Kevin wrote:
>
>  
>
>>Is there a circuit fault that could cause just the red gun to flare (to
>>the right of people's faces and objects) in this 18 year old set?  The
>>tubes test OK on my B&K, and I couldn't rejuvenate them like I normally
>>do.  When I pressed the rejuvenate button the needle moved up and
>>    
>>
>stayed
>  
>
>>there for 30-40 seconds and did not move back and forth like it
>>    
>>
>normally
>  
>
>>does after a few seconds showing that it is working.  
>>
>>If it is the red tube, what causes it to flare?  I can understand when
>>    
>>
>a
>  
>
>>picture is dark that the cathode is covered in oxide, and that
>>cleaning/rejuvenating cleans off this covering.  But what goes bad in
>>the tube that causes it to flare?  Thanks.  
>>
>>Kevin Wilks
>>Kevin's TV & Video Repair
>>Penticton BC Canada
>>kevintv@xxxxxxx 
>>
>>
>>
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