Dell E197FPf no power on and squealing transformer - guidance?

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  • piernov
    Super Moderator
    • Jan 2016
    • 4435
    • France
    #21
    Re: Dell E197FPf no power on and squealing transformer - guidance?

    Glad to hear the monitor is fixed. Did you check the voltage at the new U801 output? Also make sure it's not overheating. (maybe another component caused the old U801 death, if everything is alright now it may have died on its own)

    Not sure about the transformer noise. I remember a couple ATX PSU with a high frequency noise (near 10kHz probably) caused by bad filter caps on the secondary. Since you already recapped the power supply, this is probably not the issue.
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

      Comment

      • Shotgun25
        Senior Member
        • Feb 2014
        • 90
        • UK
        #22
        Re: Dell E197FPf no power on and squealing transformer - guidance?

        Thanks for the follow U801 output is as follows...

        Code:
        U801
Pin 1 - 0V
Pin 2 - 3.26v
Pin 3 - 5.04v
        Was on standby for 2 minutes while I was measuring and no sign of heat, not even warm.

        What testing should I do for the heat while I wait for a replacement radial fuse?

          Comment

          • piernov
            Super Moderator
            • Jan 2016
            • 4435
            • France
            #23
            Re: Dell E197FPf no power on and squealing transformer - guidance?

            Well should be ok, it was just a quick check to see if it wasn't overloaded.
            OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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