![]() What are the disadvantages of the power button? After all, it offers the great advantage that we can easily turn a PC on, and in emergency also off. What advantages does the power button have?Īctually, the power button is a very practical invention. At that moment, the power supply receives the signal to supply the computer with power and thus start up. By pressing the power button, a circuit is closed on the mainboard. The power button has a cable, which is connected to two pins on the motherboard. How does a power button work technically? Often, the power button has an integrated LED that lights up to signal that the PC is running. It can take various sizes and shapes, depending on how it fits the design or is practical. Unlike the interfaces, for instance, the appearance of the power button is not specified. Depending on the settings in the software, the Power Button can also be used to put the running PC into hibernation. Since this can cause software problems, we should only do this in an emergency. Only for hard reset during operation – for example if the PC hangs – it is still needed. Whereas in the past, at Windows 95 and such, we had to wait a few minutes until the PC shut down and could be switched off, this now happens automatically. In computers, such as our Mini-PCs, the functionality is now limited to switching on. exploit Wake up RTC, PCI, to reproduce a Soft-on.The power button is, as the name implies, a switch that can be used to switch electrical appliances on and off. use a PCI device (if exist) where I can wire the power button solder Power Button wires somewhere else on the mobo (near a chip? on PCI pin ? reproduce to Power On "signal" (voltage variation in period) with an electronic component wierd on pin's or somewhere else on the MoBo. to repair this components (I'm sure not in fact, it's to small now, impossible to solder on the PCB MoBo) I'm just wondering I it is possible either : Probably an elecronical component (resistor, capacitor or FET) had hot and his value has changed On stand by/computer off (pin open) it should be 3-5V, on power Soft-on (pin shorted/power button pressed) it should fall to 0.15V (or below 0.8V) in less than 22 ms if I'm not wrong. In fact the "signal" to Power On is only a variation of voltage in a specific time perdiod (in milisecond ms) Logic level is HIGH -Output voltage is disabled (PS_ON pin) Logic level is LOW -Output voltage is enabled (PS_ON pin) ![]() I read a bit about the normal power-on (Soft-on) ignition sequence what I uderstand (from PS_ON# Signal Characteristics.PDF ) : So now indeed, with a brand new PSU and my brand new burned MoBo I can use it by shorting cable Green and Black from the ATX connector for about less 2 seconds (if I do it to fast fan's begin to spin and stops) It's working also if I stay shorting.īut sometimes I can startup the MoBo shorting pin's PWR_BTN on the mainboard (where you put ussualy the wire for the front power button) but it's very random (5 to 10 times to push button or shorting pin's) The First PSU burned also the new MoBo but not entirely I changed the MoBo with a brand new one but with the same PSU (200W) but the new MoBo need at least 300W (dunno if affect, normally it should be the PSU burn first) The First PSU (200W) burned the first MoBo (but I didn't know at this time that the problem was PSU Here a Copy/paste of my thread from another Forum before I made the video : On this videdo : my Motherboard, a new PSU, an USB keyboard, a VGA monitor and a "PC analyzer" card (POST PCI/ISA Diagnostic card) Y0u†ube video : Motherboard won't start with power button - only with Green and Black cable ATX trick I made a video to show exactly how can I power-up my "dead" MoBo : I must short and hold for 2-3 secondes the Green (PS_ON) and the Black (GND) cable at the ATX connector to start up my Mobo. (I already tried with another Power Button) Now with a new PSU I cannot start my MoBo normally with the Power Button or directly trough PWR_SW pin's on the MoBo. Something burned near the F_Panel pin's (maybe a capacitor, resistor or FET) (I can't RMA-it because : 1) I bought it in 2nd hands, 2) It's my bad PSU that made this is issue) I burned my brand new MoBo ECS 945GZT M with a bad PSU.
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