Hi,

PSU has tickling sound problem. I read that changing the regulator IC
will solve the problem. So I change the KA3842B Controller IC with
UC3842B IC (On Semiconductor). Tickling sound disappears but PSU could
not power on the Point of Sales terminal; just managed to flicker on
the terminal display only.

Should I use only the original KA3842B Controller IC?

Thanks for your advise.

Seventh Prince