Won't turn on... Power Supply or Mobo?
Hi Folks.
PS4 working fine. Changed it’s location… and now it won’t turn on. Wall AC is good, AC power cord is good. Press power button, get a beep and a blue light for about 1 second… and that’s all. Won’t start in safe mode, either… no secondary beep. Tore unit down to test PS. Small connector from PS to Mobo: the two outer pins are +5VDC… middle two are ground and “start” Short “start” to +5v with a pair of fine tweezers, and as long as the short is maintained, the PS puts out +12VDC on the power rails. Remove the short, and the +12 begins to quickly decay to 0V.
Question: should the PS continue to put out +12VDC after the short is removed, or does it need for the Mobo to “maintain the short” initiated by the power button press for the PS to continue to make +12VDC?
Put another way: Take just the PC (remove the cable that connects it to the Mobo, so it’s just the PS on the table). Plug it into 110VAC. Now momentarily short (touch & release) the two pins that enable the PS to make +12VDC. They are labeled “ACIN DET” (I’m assuming this is AC input detect) and “ACDC STBY” (again, I assume AC & DC Standby) inside the PS. NOT connected to the motherboard, should the PS continue to make +12VDC, or does that “short” need to be maintained (presumably by the Mobo) in order to continue to make +12VDC?
Until I can determine this, I can’t determine whether the problem lies with the PS itself, or if the fault lies somewhere in the Mobo. Don’t want to guess… want to *know.*
Thanks for reading, and for any input!
Is this a good question?
Hello How did you solve? I also have the same problem .. could you help me? thanks max
by carlo buccoleri
Hi Carlo... sorry, I never did get any kind of info from anyone or anywhere. If people know, they're not sharing. Daughter was getting rid of her PS4, so I bought that one and am using it now. The problem still bugs me.... Additional info: put a 12 volt automotive lamp in the 12 v output of the PS.... and it wouldn't light... just a very, VERY dim glow. The PS is rated for something like 12 amps - that lamp should be super bright... and it isn't. Suspect the PS is technically working, but can't put out the amperage necessary to run the device ( voltage/amperage being 'pulled down' by the load of the lamp... or PS4), so if I had to make a call right now I'd say the power supply was bad. Hope that helps, but it probably just muddies the waters even more. I'd appreciate a post if you try the power supply and it works!
by Karl H