Hello and thank you for the question.
A 2 blink pause 2 blink code is not a power supply fault in this TV. It's a convergence circuit failure. There are two STK chips and a couple of Pico fuses that make up this circuit, and the chips and fuses must be replaced. I don't know why the appliance person told you power supply- but this is not correct. There is a video at the link below that shows how to access the board that you need to remove to replace the chips.
The chips are at locations: IC8C01 267P150010 HIC, and IC8C02 267P150010 HIC
Part number for the chips are: STK392-570
If you need further assistance let me know.
If you're satisfied with my service, please rate the answer accordingly.