LG and Executronics bad experience.

My LG 39" led TV worked well for 4 years, then the screen went blank. As the unit was no longer under warranty I decided to remove the rear cover and check for loose connections or other apparent issue. I checked the power supply board , which tested ok, but had no means of verifying that the main board was fine, although there were no obvious faults (broken tracks, scorched components). My prognosis was that the backlighting led's had failed (most common cause of a screen going black) and I decided to contact LG for professional repairs. I was unable to get through on their phone line , but found an e-mail message service on their website. With no reply after 3 days I sent another e-mail , but two months later , still no reply. In the interim I found that Executronics in Longmeadow were an accredited LG repair centre and took the unit to them on 18/02/19. Three days later I called and was told that the backlighting led's had failed and could not be replaced , as they were obsolete ! The unit could therefore not be repaired. (Thank heaven the automobile industry has parts available for longer than 4 years !) On collecting the tv , the technician confirmed that the power supply and main board were fine , but the backlighting leds could not be replaced. On arriving home with the defunct unit , I decided to remove the power supply and main pc boards and sell them on the internet, but Lo and behold , both boards now had obvious defects with plugs and sockets not mating up ! Based on prior experience I had marked the original boards with nail varnish and these boards had no markings ! To cut an already long story short ......... the Executronics technician denied changing the boards out ( how surprising ) and there was nothing further to be said. All I can say is that I will never buy another LG product , nor have any dealings with Executronics ever again.