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   sci.electronics.repair      Fixing electronic equipment      124,925 messages   

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   Message 123,553 of 124,925   
   Jeroni Paul to All   
   V7 L27ADS-2E LCD monitor repair - dead   
   16 Apr 23 11:49:28   
   
   From: JERONI.PAUL@terra.es   
      
   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?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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