Hi @jeanmichel55815
Not sure if it's on your model's power board as searching online doesn't show boards for your specific model (you need to know the EAY number of the board - printed or ticketed on the board, to find it), rather it just shows power boards for LG OLED B7 models, but check if there's a [https://www.ebay.co.uk/itm/203587806883?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=aPWyp-1nShm&sssrc=4429486&ssuid=-jLvdb2QRZW&var=&widget_ver=artemis&media=COPY|12V switching relay]¹ on the board and if there is try replacing it. Might be designated as RL1 or RL101 on the board perhaps
¹ This is an example only. Check what the type number of the relay is on your board (if there is a similar relay) in case it is different and search online for the number, e.g. the type number of the relay in the example is G5RL-1A-LN specifications are 12V DC, 12A 250V AC