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Re: JVC service or questions

Lee Allison Posted Dec 20, 2006, in response to:Stacy Sample

I have Model # AV27020 JVC TV with vertical collapse. I know that generally the weakest components are the solid state devices and electrolytics. Vertical collapse happened abruptly on power up and I find it is not sensitive to prodding, tapping or movement! However I'm having some trouble defining the components of the vertical circuit! I wonder if you are familiar with a part that is most likely or a common weak component in this circuit. Someone who works on these everyday may have been exposed to the same problem many times! I no longer work on this equipment everyday so I'm not very effective without schematics! Especially since things have changed a lot over the last 20 years! I have looked for bad solder connections and found a few in the Horizontal section as usual but I don't see any others in what I think are vertical deflection components! I expected two complimentary output transistors but I think I only see one or should I say I see a 3 legged IC A TO 192 case I think from memory… marked "in" "out” & "C". I wonder if this is the vertical output device? I'm not sure? I need a schematic to determine the components of the vertical deflection circuit. If you can develop a picture of the vertical deflection circuit? That would give me some confidence which components to pull and check and or look for problems! I do have an oscilloscope to check wave form once I know where to look! It would be nice to have a component layout also if available to locate the parts but all are labeled so this is not a critical need! Any advice you can offer will be appreciated! Thanks Lee

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