Walton makes (
manufactures mostly from scratch) refrigerators (even smart IoT refrigerators), Aircons, LED-screen TVs (LCD-screen is older technology), LED Bulbs, Sealed Lead Acid (SLA) Batteries for inverter lamps and solar installations, Domestic Switchgear, Fans and assembles other small home electrics (kitchen and household blenders, friers, irons etc.) from local and Chinese components.
No company I know (even brand-name companies making OEM TVs for US market) manufactures SMD components used in TV Boards. Neither does Walton. But they do design and make their own boards and place SMDs using pick-and-place machines and wave-soldering machines.
I doubt they make their own LED screens AFAIK. LED screens need very sophisticated clean rooms and they haven't invested in it yet - most probably because buying overseas is probably cheaper for their current volume.