hi friends, I have made the LED matrix board using the cascaded 4017 ICs with AND gates. it was working nice for several days, but suddenly it got problem that the alternate lines are getting selected.
eg. the lines which should get selected one after another after applying clock pules
expecter o/p : q1 q2 q3 q4 q5 q6 q7 . . . .
o/p getting : q1 q3 q5 q7 . . . ..
please help its very urgent
i have also uploaded the video, it is working fine for first IC and then problem comes from the second IC on words
I agree with Kripa,
Lokoa t your schematic, try to find in your and logics where a static 0 or static 1 could cause jumping.. I would guess if this is using a decoder your lsb froze high or low. since this is running so slowing you could use a multimeter and try to find the static logic signal. trace it back to whats generating it and replace the ic. also if someone was to cut the wire trace this would happen. just need to trace through your physical wire path.
gl,
Pb
btw thats a lot of leds