From: ohg...@gmail.com   
      
   On Monday, July 25, 2022 at 12:11:46 PM UTC-4, Peabody wrote:   
      
   >    
   > I did try disconnecting the main board, and the LEDs did    
   > indeed light up fully, with about 281V across the LEDs. But    
   > unfortunately, it's still working,   
      
   Don't run it long with the main disconnected when testing - it will run the   
   LEDs at higher current than full backlight adjustment will even drive them.    
   Good for a quick test but don't leave it running that way.   
      
   Put the TV on a static input (DVD in pause) and watch that voltage across the   
   LED array.  If it drifts more than a couple of tenths either way, either an   
   LED is starting to break down or there's a resistive contact in the   
   interconnects.  Sometimes one or    
   both will settle down for a while before acting up again.   
      
   There is another possibility however.  Most Samsung LEDs are built with a   
   zener inside each die.  Ordinarily, the zener does nothing but if the LED   
   fails open, the entire voltage of the array will appear across the zener   
   causing it to conduct and (   
   hopefully) short hard effectively jumping out the bad LED.  If it does, the   
   problem will fix itself until another wayward LED crops up or if an   
   interconnect gets resistive.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)