Samsung monitor 2493 HM steady blue light dead

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  • SolderTrouble
    Member
    • Aug 2013
    • 24
    • U.S.
    #41
    Re: Samsung monitor 2493 HM steady blue light dead

    I read this entire thread today because my Samsung 2493HM is experiencing the same symptoms (black display, solidly lit blue LED). I got the impression that ivtec didn't understand budm's advice regarding how to test power supply board voltages when the power supply board isn't connected to the main board. Specifically: temporarily connect a resistor between the PS-ON and STBY (standby) pins of the smaller of the two connectors normally cabled to the main board, to raise the voltage on the PS-ON pin. PS-ON is an input signal that the main board uses to tell the power supply board to turn on. When the main board isn't connected to the power supply board (or if the main board is connected but isn't working right or received feedback of a problem) then it doesn't supply 2.5Vdc to the PS-ON pin, which causes the power supply to only generate 5Vdc "standby" power (needed by the main board and by the blue LED). Connecting a jumper resistor from STBY to PS-ON will supply the signal needed to turn on the rest of the power supply voltages so they may be measured.

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