G
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·This question is mostly directed to lcaillo as he seems to know about everything there is to know about this, but help from anyone is greatly appreciated!
The Details:
The set is a JVC AV56WP74. My friend has had it for something like 3 or 4 years.
The green has a major downward bow.
As to your questions about the tech, lcaillo, my friend did not mention details, but said the guy wanted several hundred dollars just to look at it. He pretty much told the guy he'd look for a better price. So the guy didn't give a diagnosis or actual repair estimate.
From inspection, we're about 98% certain the problem is in the IC.
I have metered the resistors, and they are all within tolerance.
My friend did a lot of research on his own, after he contacted the technician and before he contacted me. He found the most common (and therefore most likely) problem was with the STK392-110 convergence chips. The suggested fix is to replace the STK392-110 with STK394-160. He says he found something online that suggested that the resistors should be changed to different values when replacing.
In my research, I have not found that and am a little skeptical. I am wondering if he misunderstood something about changing bad resistors. It seems to me that if the IC presents a similar enough effect that it can be used w/o different resistors on some sets, it should do so on all sets compatible with the original IC. Unless this is something to do with tolerances of other components, I don't see the set requiring different resistors.
The Question:
In your experience, does the JVC AV56WP74 require different resistance when switching from STK392-110 to STK394-160?
Thanks!
The Details:
The set is a JVC AV56WP74. My friend has had it for something like 3 or 4 years.
The green has a major downward bow.
As to your questions about the tech, lcaillo, my friend did not mention details, but said the guy wanted several hundred dollars just to look at it. He pretty much told the guy he'd look for a better price. So the guy didn't give a diagnosis or actual repair estimate.
From inspection, we're about 98% certain the problem is in the IC.
I have metered the resistors, and they are all within tolerance.
My friend did a lot of research on his own, after he contacted the technician and before he contacted me. He found the most common (and therefore most likely) problem was with the STK392-110 convergence chips. The suggested fix is to replace the STK392-110 with STK394-160. He says he found something online that suggested that the resistors should be changed to different values when replacing.
In my research, I have not found that and am a little skeptical. I am wondering if he misunderstood something about changing bad resistors. It seems to me that if the IC presents a similar enough effect that it can be used w/o different resistors on some sets, it should do so on all sets compatible with the original IC. Unless this is something to do with tolerances of other components, I don't see the set requiring different resistors.
The Question:
In your experience, does the JVC AV56WP74 require different resistance when switching from STK392-110 to STK394-160?
Thanks!