Quote:
Originally Posted by Eric H
I thought the Vertical chips for these were unobtainable?
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I don't remember it being hard-to-get... But maybe time has gotten away from me, since now I can't remember the last time I repaired one. Probably the mid-90s
. But I think those output ICs are still out there. Mitsubishi used a funny one (AN5553 or something like that odd number), which was a tough one to get in the early 2000s. But I blamed it on so many of them blowing, and the demand. The nice thing is that the most expensive one I remember, was about $3 from the traveling salesman. Most (like LA7838 and AN5521), were about $1.25.
I've seen them cause a vertical hop or jump, which can look like a roll. It's not a loss of v-sync, as if the oscillator is acting up. It's a feedback from the output that kicks the oscillator out of whack as it tries to correct the hop.
Charles