Hi guys, I have a few Dell Inspiron 3147 motherboards that are exhibiting the same issue. I am new to motherboard repair so if this is a very simple rookie obstacle bear this in mind 
I have the same issue on multiple 3147 boards (Winstron 13270-1) in which I have my DCBATOUT rail, my 3d3v_aux, and my 5v_aux and they are stable. However, when I turn on the bench power supply to power the motherboard my 3d3v_s5 and rail powers up to 3.3v for 1-2 seconds and turns off. The 5v_s5 rail gets to 5v before powering off. All rails turn off at the same time. The 3 and 5v regulator "PU4503" generates the 3v_5v_POK signal before all of the rails excluding the first 3 rails shut down. The 1d8v rail powers on before the board shuts down etc. etc.. I have measured the resistances of the 3d3v_s5 and 5v_s5 rails to ground and have them both at ~390 ohms. I have followed the schematic checking each rail, and prior to turning itself off, the motherboard looks good until RSMRST# which stays low the entire time.
Like I have said I have run into this type of issue on multiple boards (not only on Inspiron 3147's) as well and I am curious to know what would cause something to seemingly power on for only a few seconds only to turn off and stay off. Thank you for any help you can render!
I have the same issue on multiple 3147 boards (Winstron 13270-1) in which I have my DCBATOUT rail, my 3d3v_aux, and my 5v_aux and they are stable. However, when I turn on the bench power supply to power the motherboard my 3d3v_s5 and rail powers up to 3.3v for 1-2 seconds and turns off. The 5v_s5 rail gets to 5v before powering off. All rails turn off at the same time. The 3 and 5v regulator "PU4503" generates the 3v_5v_POK signal before all of the rails excluding the first 3 rails shut down. The 1d8v rail powers on before the board shuts down etc. etc.. I have measured the resistances of the 3d3v_s5 and 5v_s5 rails to ground and have them both at ~390 ohms. I have followed the schematic checking each rail, and prior to turning itself off, the motherboard looks good until RSMRST# which stays low the entire time. Like I have said I have run into this type of issue on multiple boards (not only on Inspiron 3147's) as well and I am curious to know what would cause something to seemingly power on for only a few seconds only to turn off and stay off. Thank you for any help you can render!
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