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I continue to see people having problems with convergence repairs, and with what they believe to be convergence problems. There are some important facts that many do not seem to understand, most importantly that these repairs are often not just a matter of replacing a couple of chips. What is most distressing is that I see posts from techs who really do not understand how these circuits work nor how to properly troubleshoot a problem.
First some perspective. A majority of convergence repairs in CRT based RPTV can be completed with only the replacement of the output ICs and maybe a resistor or fuse or a couple of each. That means that a minority of them, but a significant number involve something else. Hopefully this thread will help to sort out what some of those problems are, both generally, and with respect to some specific products.
Second, there are many problems that get created when one is attempting to repair a set. Some of these issues are covered in the Convergence Repair sticky in the first 10 posts, but I will try to be more complete here. Some information may be duplicated, but it is useful and often never clearly stated in much of what can be found online, so I don't think that is a problem.
Finally, if any of you techs are reading this who constantly criticize me for giving this information to consumers, I suggest you simply read on through and learn something if you can. Some of the very critics that I have experienced have also posted some of the most embarrassing questions that, IMO, a professional in this field could ask. It continues to shock me how little many techs know about how these circuits work, and how many assume that they can fix every set by replacing ICs and pressing some auto-convergence button. The level of discussion on these problems on the tech lists and forums is not much better than on some of the consumer sites. The difference is that there is a lot less mis-information in the responses, generally.
I hope this makes some problems easier to solve for someone.
First some perspective. A majority of convergence repairs in CRT based RPTV can be completed with only the replacement of the output ICs and maybe a resistor or fuse or a couple of each. That means that a minority of them, but a significant number involve something else. Hopefully this thread will help to sort out what some of those problems are, both generally, and with respect to some specific products.
Second, there are many problems that get created when one is attempting to repair a set. Some of these issues are covered in the Convergence Repair sticky in the first 10 posts, but I will try to be more complete here. Some information may be duplicated, but it is useful and often never clearly stated in much of what can be found online, so I don't think that is a problem.
Finally, if any of you techs are reading this who constantly criticize me for giving this information to consumers, I suggest you simply read on through and learn something if you can. Some of the very critics that I have experienced have also posted some of the most embarrassing questions that, IMO, a professional in this field could ask. It continues to shock me how little many techs know about how these circuits work, and how many assume that they can fix every set by replacing ICs and pressing some auto-convergence button. The level of discussion on these problems on the tech lists and forums is not much better than on some of the consumer sites. The difference is that there is a lot less mis-information in the responses, generally.
I hope this makes some problems easier to solve for someone.