Unfortunately SM parts are often unlabelled, or use an in-house code, meaningless to anyone else. You need to get the details off the service manual, which is pretty certainly not available to you (or anyone else), or you're stuffed.
It doesn't help that's it's most likely a cheap Chinese device, and will use the cheapest chip they could find, regardless of availability.
Thanks all for helping, for now I am stuck and will put project aside and hope in next few weeks to pick it up again to do another deep search. I am getting more of these equipment to repair so it is becoming a must for me trace back this part