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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Panasonic CTN-2056S Convergence off - serviceman mode doesnt work
Guys,
I've got a 1992 Panasonic 20" TV (model: CTN-2056S Chassis: AEDP213) - the convergence at the bottom of the screen is off. Does this unit have a "serviceman mode" like the newer panasonics? I've tried the normal "cable, timer=30, volume=0" but this tv wont even go to channel 124 (max is channel 99). How can I get into the menu and/or adjust the convergence? Thanks, --Eric |
#2
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Probably total registration will be by way of the convergence magnetic rings
around the neck of the CRT. Rarely there may be "spot" magnets to enhance specific areas but rare on 20 " sets. "Eric" wrote in message oups.com... Guys, I've got a 1992 Panasonic 20" TV (model: CTN-2056S Chassis: AEDP213) - the convergence at the bottom of the screen is off. Does this unit have a "serviceman mode" like the newer panasonics? I've tried the normal "cable, timer=30, volume=0" but this tv wont even go to channel 124 (max is channel 99). How can I get into the menu and/or adjust the convergence? Thanks, --Eric |
#3
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Hmmm - interesting. It seems like it is only the red convergence that
is off in the bottom 1/4 of the screen. I'm used to stig/flare rings on crt projector tubes, but not on TV tubes - Which set of rings should be adjusted to try and compensate? Thanks, --Eric Art wrote: Probably total registration will be by way of the convergence magnetic rings around the neck of the CRT. Rarely there may be "spot" magnets to enhance specific areas but rare on 20 " sets. "Eric" wrote in message oups.com... Guys, I've got a 1992 Panasonic 20" TV (model: CTN-2056S Chassis: AEDP213) - the convergence at the bottom of the screen is off. Does this unit have a "serviceman mode" like the newer panasonics? I've tried the normal "cable, timer=30, volume=0" but this tv wont even go to channel 124 (max is channel 99). How can I get into the menu and/or adjust the convergence? Thanks, --Eric |
#4
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Hmmm - interesting. It seems like it is only the red convergence that
is off in the bottom 1/4 of the screen. I'm used to stig/flare rings on crt projector tubes, but not on TV tubes - Which set of rings should be adjusted to try and compensate? Thanks, --Eric Art wrote: Probably total registration will be by way of the convergence magnetic rings around the neck of the CRT. Rarely there may be "spot" magnets to enhance specific areas but rare on 20 " sets. "Eric" wrote in message oups.com... Guys, I've got a 1992 Panasonic 20" TV (model: CTN-2056S Chassis: AEDP213) - the convergence at the bottom of the screen is off. Does this unit have a "serviceman mode" like the newer panasonics? I've tried the normal "cable, timer=30, volume=0" but this tv wont even go to channel 124 (max is channel 99). How can I get into the menu and/or adjust the convergence? Thanks, --Eric |
#5
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If this is the standard 20 inch set that I think it is, there are no
convergence controls in the service setup for your set. The bottom, top, and sides are done with adhesive slip magnets that are mounted on to the CRT bell, and extend down in to below the yoke windings. You may need additional magnets from the ones that are already installed. The ring magnets on the back of the CRT neck only do the main centre convergence and purity. I strongly suggest to not mess with these ring magnets, unless you have a lot of experience, and the grating test generator, to do the proper setup with this. Most of these sets will have a convergence error of about 1 mm to 2 mm at the extreme sides, and top and bottom of the screen. The centre area convergence should be about 1 mm or less error. -- Jerry G. ====== "Eric" wrote in message oups.com... Guys, I've got a 1992 Panasonic 20" TV (model: CTN-2056S Chassis: AEDP213) - the convergence at the bottom of the screen is off. Does this unit have a "serviceman mode" like the newer panasonics? I've tried the normal "cable, timer=30, volume=0" but this tv wont even go to channel 124 (max is channel 99). How can I get into the menu and/or adjust the convergence? Thanks, --Eric |
#6
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Ahh - I thought there might be some slip magnets in their somewhere.
Well, I'm not exactly an expert, but I felt qualified enough to adjust the ring magnets. Everything was pretty close, but I did manage to make it noticeably better. I also noticed someone has been 'in it' besides panasonic - the rings must have been re-adjusted before I got the unit, becuase the factory marks were off (and re-hotglued). Its not perfect, but for a 13 year old set it doesnt look to bad. --Eric Jerry G. wrote: If this is the standard 20 inch set that I think it is, there are no convergence controls in the service setup for your set. The bottom, top, and sides are done with adhesive slip magnets that are mounted on to the CRT bell, and extend down in to below the yoke windings. You may need additional magnets from the ones that are already installed. The ring magnets on the back of the CRT neck only do the main centre convergence and purity. I strongly suggest to not mess with these ring magnets, unless you have a lot of experience, and the grating test generator, to do the proper setup with this. Most of these sets will have a convergence error of about 1 mm to 2 mm at the extreme sides, and top and bottom of the screen. The centre area convergence should be about 1 mm or less error. -- Jerry G. ====== "Eric" wrote in message oups.com... Guys, I've got a 1992 Panasonic 20" TV (model: CTN-2056S Chassis: AEDP213) - the convergence at the bottom of the screen is off. Does this unit have a "serviceman mode" like the newer panasonics? I've tried the normal "cable, timer=30, volume=0" but this tv wont even go to channel 124 (max is channel 99). How can I get into the menu and/or adjust the convergence? Thanks, --Eric |
#7
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Also, one of the rubber wedges mounted between the CRT and the yoke may have
fallen out (probably lying on the circuit board); this will allow the yoke to flop down or sideways about 1/4 to 1/2 in, screwing the edge convergence. If this is your problem, just shove the rubber wedge back in and glue it to the CRT with some silicone RTV. |
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