From: pafoxp@x14all.kpn   
      
   On 16-04-2023 20:49, Jeroni Paul wrote:   
   > The video/control board in this LCD monitor seems dead. It has a   
   TSUM088CDT9-7 video processor and does not react to any button press, does not   
   enable the back light and is not detected when plugged to a computer. It runs   
   off a single 5V supply and    
   contains two voltage regulators, 3,3V and 1,2V that supply the Vcc pad and   
   core respectively. The crystal oscillator seems to be running checked with a   
   short wave radio at 14,31MHz.   
   >   
   > I can't find any information on that processor and I am not sure if the 1,2V   
   supply is right. The nearest I could find is a service manual for a LG LM91C   
   chassis with a TSUM088GDT that states 1,8V for the Vcore. I found some other   
   service manuals using    
   other TSUMxxx models and all state 1,8V core voltage. However the 1,2V   
   regulator seems fine, the control input is feed with a resistor divider from   
   the output and it is at 0,6V just like the 3,3V regulator. The resistors are   
   unmarked black SMD resistors    
   so I can't tell if they are the right value but they are not open. Before   
   trying to hack the regulator to 1,8V I would like to be sure this IC it is not   
   supposed to run at 1,2V.   
   >   
   > Anyone ever heard of that processor IC?   
   Are you sure its must be 1.2V which seems to me for a LCD monitor   
   somwhow strange. Whatś the input voltage of the "regulator" ?   
      
   I think feeding things with 1.8V, providing doing this with low current,   
   will not harm things. If you habve a bench power supply, give it a slow   
   try.   
      
      
   --   
   Mvg...   
   Peter   
      
   --- SoupGate-Win32 v1.05   
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