Steve Anderson wrote:Albert, are you saying that three complete lines are missing? All 48 pixels dead? i.e. you only have 29 lines. Or three pixels dead, only 45 pixels in each line but 32 lines?
Whichever way, is it consistent? Lines 1,2,3 or 30,31,32 or pixels 1,2,3, or pixels 46,47,48?
Steve A.
Sorry Steve for describing this fault badly.
It is 3 horizontal 'lines' missing, not verticals on the 32 lines.
(Its the 2nd, 4th horizontal pixels line from the bottom and also near the top..........see piccy.
It is being caused by low o/p from 3 transistors in the 48 line clocking, so that at each pixel at that horizontal point clocked is lowish o/p.
I changed the relevant 4017 and transistors but no cure yet. I haven't devoted much time to this but when I do will let you know more about what I find.