This is a brand new, sealed diode 20LC30 used in various YSUS and ZSUS boards by LG.
Order a serviced and tested power supply board 272217100571 / 272217100571 / PLHL-T722A / 2300KEG033A-F, then send your old one back to get credit.
65E510-6M63N / 168P-P5F041-W1 power board for LG 65LB5200-UA - serviced, tested , $50 credit for old dud
Buy reconditioned power supply board 65E510-6M63N for your LG 65LB5200-UA, then send your old dud for credit!
Buy a working power supply board DPS-304BP-1 / RDENCA235WJQZ, then send your old defective dud to get credit!