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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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