Hi;
I don't recall the exact model right now, but it's got the digital convergence. Set came in with serious errors mainly in the red horizontal channel.
The trained eye could tell it was not the output IC, no foldover, no massive offset. So I set the convergence.
It has gone bad again. Tomorrow is going to be one of the rare occasions I go on the road. I suspect I will simply set the convergence again (in front of the customer, oh joy), but the real cure needs to be found.
Somebody correct me if I am wrong, but those PA000X ICs do not store data onboard correct ? Data comes from the EPROM. Thing is, how in the heck can something only be affecting the red horizontal ?
Right now I think tomorrow I am going to focus on whether the error is exactly the same as before. From the description it sounds the same. At this point I wonder if something is forcing the parameters back to some virgin factory state or something. Like a default.
The most whacked out parameter was horizontal linearity, and now the complaint is "the red won't move over far enough". I remember the Hlin value was like -45 and it came into alignment as it approached 0. If I find the same thing tomorrow, well we will have another piece of information.
I'd appreciate anything you can tell me about these sets. Due to the cost of prints and the fact we don't see all that many of them I don't have service info. I drew the conclusion that the PAXXXX ICs don't store the parameters because I have swapped red and blue on other sets to see if the problem followed and the set did not require reconvergence. Logical right ? Well, sometimes logic doesn't work. Logic also says that "shit happens" when data are involved, look at all the RCA EPROMs some of you haven't had to change due to the chipper checker. The part simply isn't bad, all it took was some bad data coming in, or even a static discharge to a data line at just the wrong time. Watch me find a bad ground near the tuner on this Pioneer now L O L. ( I doubt it )
Anything you got, really. This is a mid-late 90s set, and they are pretty much the same. A feature here and there may differ, but I know they kept the same design for a few years as far as the convergence goes.
Thanks in advance.
JURB