Update:
20 March 2019, Friday
TV died. Called LG. Had to leave phone number for callback.
Contacted by 3 different CSOs within an hour (past 6 PM!

). Technician scheduled to drop by the next day (Saturday, @ 1 PM)!
21 March 2020, Saturday
Technician called at 9.30 AM, asking for photos of fault, if any, & of receipt for warranty confirmation. WhatsApp-ed him photos. Warranty should be till 26 November 2020.
Technician called again soon after to inform that it was likely the LCD panel issue. Said he will place an order for the replacement. Estimated to take 3-4 weeks to arrive. LLST. On-site appointment cancelled.
31 March 2020, Tuesday
Technician called at noon. Part had arrived. Asked if he can drop by later that day to replace it.
Showed up at 3.30 PM. Replacement & testing done in about 45 minutes.
Was told that the new LCD is improved model & should be longer lasting. Was encouraged to use the APS mode (80% everything) instead of the Vivid mode I used for watching football (100% brightness etc.). Also, to switch off the unit at the mains at least once every week rather than leaving it on standby forever.
I asked what would happen if the panel/TV fails outside of warranty (i.e. how much for the LCD panel replacement). Fella said "...just buy new TV...".

This was a $5000+ TV...