Dell AL440LX power on switch circuit help required

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  • Powderfanupnorf
    Member
    • Mar 2024
    • 16
    • United Kingdom

    #1

    Dell AL440LX power on switch circuit help required

    Hi Everyone. First official post so fingers crossed I conform and also manage to get photos to work.

    So I am requesting some help from anyone who happens to have one of these motherboards to hand and perhaps a multimeter.

    My board has a single row of header pins for all the front panel stuff (have seen others where they are grouped together differently so thats no help) and the two pins for the power on switch had been previously repaired and I am trying to make a better repair. There looks to be pad and trace damage and im happy to relocate the header pin/pins to another location on the board (if there is one) and also happy to run patch wires in place of damaged tracks. From what I have managed to zoom into there is what looks to be a capacitor missing which connects to one of the pins. So then what is it I need?

    Well if someone has one of these boards and can take some high res photos of the area around the power on header pins on both sides of the board that would be awesome. Further if anyone can identify a suitable smd capacitor I could/should use in place of the missing component that would also be great. Finally can someone explain the circuit from the atx power socket to these header pins,and via the switch to ground? This is so I can check where I have broken tracks and where I need to install patch wires etc.

    My understanding is the standby voltage comes in then goes to one of the power on pins (among other places), the switch then momenterally grounds this to turn on the psu and start up the motherboard proper.

    Really any accurate information would be greatfully received. Really dont want to be buying a second motherboard if I can help it but that may be my only way to get the information I need to fix this one.

    Ok now for the photo dump.

    Thanks in advance
    Michael

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