Hisense 65 Smart TV stuck in on off loop

I have a Hisense MODEL: 65R7EI | SN: 65G185296H00665 that suddenly just went in a continuous loop of turning off for 3 seconds then coming on with the Hisense logo on the screen for about 3 seconds and just repeats over and over.

I tried every recommendation given on the Hisense site:

Hard factory Reset, plugged the power cord direct to the wall outlet and replaced the power cord, checked for swollen capacitors and still the issue continued.

As a final effort, I ordered and replaced the Power Cord, Power Board and Main Board on the TV with certified brand new Hisense parts and the TV still goes on and off.

Out of Ideas on fixing this problem. What else could possibly be the issue?? There is nothing left to replace for a probable power issue.