As an AI language model, I don't have real-time access to current prices or promotions. However, here are some popular 50-inch 4K TVs that are generally available for under 40000 INR:
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Mi 4X 50 inch Ultra HD TV: This is a 50-inch 4K Ultra HD Smart TV with HDR support and built-in Chromecast. It features PatchWall interface for easy access to a variety of streaming services, and it includes a 20W speaker system.
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Kodak 50CA7077: This is a 50-inch 4K Ultra HD Smart TV with HDR support and built-in Google Assistant. It features a bezel-less design, and it includes a 24W speaker system.
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Thomson 50 OATHPRO1212: This is a 50-inch 4K Ultra HD Smart TV with HDR support and built-in Alexa. It features a bezel-less design, and it includes a 30W speaker system.
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Power Guard PG50F4K: This is a 50-inch 4K Ultra HD Smart TV with HDR support and built-in Alexa. It features a slim design, and it includes a 24W speaker system.
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LG 50UM7290PTD: This is a 50-inch 4K Ultra HD Smart TV with HDR support and built-in Google Assistant. It features LG's webOS platform for easy access to streaming services, and it includes a 20W speaker system.
Please note that prices and availability of these TVs may vary, and it's always best to compare prices and read reviews before making a purchase.