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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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#1
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JVC av56wp30 56" TV, no red convergence control
I have a customers set in the shop, that the red convergence is way off,
and the on screen convergence settings will let me move the red from side to side, but the up-down controls don't work at all. I am guessing a chip or other component in the convergence circuit has popped. Anynbody seen this in this model? Thank you much... Mike Shullaw Lee's TV Lincoln Ne. |
#2
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JVC av56wp30 56" TV, no red convergence control
Mike, I am not a Pro, but I had the same problem with a 50" Hitachi,
but it was the blue that wouldn't move. I had to replace the convergence amp. This fixed this problem. Hope this helps. |
#3
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JVC av56wp30 56" TV, no red convergence control
Replace both STK convergence IC's, also check low value resistors.
..5, or 1.0 ohms approx. "BigMike" wrote in message newsp.s2kh9kry87sx8z@bigmike-3u89k6k... I have a customers set in the shop, that the red convergence is way off, and the on screen convergence settings will let me move the red from side to side, but the up-down controls don't work at all. I am guessing a chip or other component in the convergence circuit has popped. Anynbody seen this in this model? Thank you much... Mike Shullaw Lee's TV Lincoln Ne. |
#4
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JVC av56wp30 56" TV, no red convergence control
On Thu, 29 Dec 2005 21:36:53 -0600, Dani wrote:
Replace both STK convergence IC's, also check low value resistors. .5, or 1.0 ohms ap Thanks for the tip, I appreciate it. "Because of the interlock on the back on this JVC, I don't wan't to take the back off until I have the parts. Seems this is a very common problem with this set, so I am going to try to find the part numbers and get them on order first. I'm just glad I knew about the booby trap on the back, or this could of been a real pain. -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ |
#5
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JVC av56wp30 56" TV, no red convergence control
On Thu, 29 Dec 2005 20:49:02 -0600, Golf wrote:
Mike, I am not a Pro, but I had the same problem with a 50" Hitachi, but it was the blue that wouldn't move. I had to replace the convergence amp. This fixed this problem. Hope this helps. Thanks for the tip! |
#6
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JVC av56wp30 56" TV, no red convergence control
You can do the convergence surgery through the front panel of this model without removing the back and setting off the booby trap. John |
#7
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JVC av56wp30 56" TV, no red convergence control
On Fri, 30 Dec 2005 10:46:33 -0600, BigMike
wrote: On Thu, 29 Dec 2005 21:36:53 -0600, Dani wrote: Replace both STK convergence IC's, also check low value resistors. .5, or 1.0 ohms ap Thanks for the tip, I appreciate it. "Because of the interlock on the back on this JVC, I don't wan't to take the back off until I have the parts. Seems this is a very common problem with this set, so I am going to try to find the part numbers and get them on order first. I'm just glad I knew about the booby trap on the back, or this could of been a real pain. Good you're aware of it. The booby trap is the optical sensor under a hole in the DVI metal box. Unplug power plug and wait a minute, remove panel, unplug all wires to the DVI module and you can work on it safely with power on. Also you can work from front for convergence job only, if this model uses long retangular convergence board (no screws, held in place with snap hooks with metal box. you can get it out from front and reach deep to release one of cables from holders and unplug from the small stand up PCB. I did this on several of those. Cheers, Wizard |
#8
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JVC av56wp30 56" TV, no red convergence control
On Fri, 30 Dec 2005 17:35:02 -0600, John-Del wrote:
You can do the convergence surgery through the front panel of this model without removing the back and setting off the booby trap. John Thanks for the tip, John. I replaced the ICs and one burnt out resistor, and the set is working fine. I have a question about it. After I replaced the ICs, the auto convergence pulled the center together real well, but I had to manually adjust the outsides of the screen, which were pretty far off. Also, the heatsinks on the ICs are running pretty darn hot, although the ICs themselfs seem to be only warm, I can leave my finger on them. Should these heatsinks run hot, and is the outside convergence needing to be manually aligned, normal? Or should I be on the lookout for something else? Thanks for the help... -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ |
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