From: ohg...@gmail.com   
      
   On Saturday, July 23, 2022 at 9:27:02 AM UTC-4, Peabody wrote:   
   > ohg...@gmail.com says...   
   > > In *this* model, they're all in series and it's a one    
   > > channel LED system - one LED or if one interconnect    
   > > opens, no light.   
   > On the ShopJimmy page for this model, it shows the LED    
   > package as seven strips of eight LEDs, plus seven strips of    
   > five LEDs. That's 91 LEDs. If they're all in series, then    
   > 3V LEDs would need 273V. So perhaps the strips are wired in    
   > some parallel configuration?    
      
      
   I have an HU board here in front of me that I grabbed the standby IC out of   
   for another job,  and I have the LED voltage marked as 325/375V on the BD9101   
   ferrite jumper (with respect to cold ground. Use the mounting screws for   
   ground).  I have seen a    
   bunch of TVs that use a series/parallel arrangement, but I can't recall   
   Samsung ever doing that.   
      
      
      
   > I'm starting on the diagnostics this morning with a neighbor    
   > who I discovered used to work for TI back in the day.    
   >    
   > One of the ShopJimmy videos say flatly that if you pass the    
   > flashlight test, with audio, then a dark screen is either    
   > the power board or the LEDs. I guess that's not absolutely    
   > always true, but seems logical to me. I'm hoping for the    
   > power supply to be the problem. I'm not sure I would be    
   > willing to tackle the LEDs. I've watched those videos, and    
   > it's a major undertaking, with lots of opportunities to break    
   > things.   
      
      
   I'm not a betting man, but put a gun to my head and I'm going with bad LEDs,   
   bad connections on the interconnects (or both), but inside the display for   
   sure.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)