Component without datasheet

[Alimash]

Hello
I am troubleshooting a couple of coolmaster ATX power supplies.
I suspected that the faulty components are the sps supervisor IC's labeled "IN1S313I" and"IN1S424I".
I couldn't find any information about them online exept for their name, role and the manufacturer witch is "infsitronix".
No datasheet, no pinout, i even tried to email infsitronix but no reply so far.
I can't find a supplier to buy it either.
Any help of how to test it and where to buy/order it is appreciated.

Regards.

[magic]

A fairly common occurrence in ATX PSUs. If you reverse engineer enough of the surrounding circuitry, it usually becomes evident what they do.

Most SMPS problems are caused by bad capacitors or power semiconductors, rarely the control ICs.