So I finished adding LED's to my time machine and never had this problem before. The playfield insert LEDs exhibit a very slight flicker only when slings or the pop bumpers are hit. It's very slight and annoying. I initially installed #555 4 led lights. Switched them to cointaker's #555 single led (non-ghosting) with
same result. I thought it may be the 30,000uf 25v cap in the headbox but I swapped that and same result. Anyone have this problem with LED install for the
inserts and have the same issue? What was the fix?

bump.

nope. I think it can't use super bright led's. I may try regular single to see how it goes