AM1H-ITX power down issues

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   As the others before me have said to check for a short on the underside of the motherboard ATX connector, but you can also check for a short on the front panel I/O pins, where the case leds/buttons are connected, you can clean them with some alchool and a soft tissue.If still the same, the motherboard I/O chip might be busted by a power surge/ESD, but if I remember right you can also take out the CPU and re-seat it. Those AM1 CPU's are a little flaky, they have everything on them including the south-bridge, and just a bit of oxidation on the pins in a more humid climate can cause unforseen problems. Its worth a try, if nothing suggested in this thread works, your last bet unfortunately is RMA/warranty

Edited by cristy6100 - 20 Apr 2018 at 10:24pm

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
cristy6100 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 15 Mar 2018 Location: Romania Status: Offline Points: 269	Post Options Post Reply Quote cristy6100 Report Post Thanks(0) Quote Reply Topic: AM1H-ITX power down issues Posted: 20 Apr 2018 at 10:22pm
	As the others before me have said to check for a short on the underside of the motherboard ATX connector, but you can also check for a short on the front panel I/O pins, where the case leds/buttons are connected, you can clean them with some alchool and a soft tissue. If still the same, the motherboard I/O chip might be busted by a power surge/ESD, but if I remember right you can also take out the CPU and re-seat it. Those AM1 CPU's are a little flaky, they have everything on them including the south-bridge, and just a bit of oxidation on the pins in a more humid climate can cause unforseen problems. Its worth a try, if nothing suggested in this thread works, your last bet unfortunately is RMA/warranty Edited by cristy6100 - 20 Apr 2018 at 10:24pm
	Main Rig: AMD Ryzen 2400G \| ASRock Fatality X370 ITX/ac UEFI 4.90 \| Corsair LPX DDR4 2400@3200 1.35V \| Corsair RM650i PSU \| CM ML120L AiO Cooler

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 26933	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 20 Apr 2018 at 8:40pm
	Check the underside of the board for bent over/shorting solder points. I understand what you are saying and no, that should not be happening. If there is no obvious short (that is easy to fix), I suggest you RMA the board if at all possible. I have seen similar issues caused by a standoff in the wrong place causing shorts. You have taken the board out of the case but if something under the board shorted it may have created a carbon trace or bent over one of the capacitor/component wires soldered through the PCB. Give it a good going over, I would start with the underside of the board nearest the 24pin connector. Good luck


vesoljc Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Jul 2015 Status: Offline Points: 13	Post Options Post Reply Quote vesoljc Report Post Thanks(0) Quote Reply Posted: 20 Apr 2018 at 6:38pm
	the shutdown issue was the first symptom that i noticed. the root problem is that the motherboard is constantly sending POWER ON command to the psu, which is a motherboard fault. the hdd really has no issues here. the motherboard should trigger/short pin 16 only when a wake up event happens (either via button switch, either some wake on X event). In my case, pin 16 is constantly shorted, sending power on signal to the psu all the time, which is wrong. the pc works "fine", it just cannot properly power down to "off" state (sleep, hibernate or whatever), since psu is constantly in full awake state.

chubalz Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Aug 2017 Location: Philippines Status: Offline Points: 78	Post Options Post Reply Quote chubalz Report Post Thanks(0) Quote Reply Posted: 20 Apr 2018 at 6:10pm
	i don't get whats your point. You've said after shutting down your system... the psu fan and cpu fan is still spinning? this is caused by bad HDD. Does you computer function properly before shutting down? Now you have different issues which " When I plug in power cord, only the psu powers up (fan starts spinning), but power usage meter is showing 30W draw in this state. I tried this: if I unplug the 24pin cable from motherboard, connecting the powercord does nothing. Similarly, toggling psu power switch does nothing. As soon as I connect 24pin the psu powers up, clearly indicating that the motherboard is giving "orders"... ??? Your first post and your reply to me has two different issues. Can you post a video here in shutting down your system? Edited by chubalz - 20 Apr 2018 at 6:42pm
	Ryzen 5 1600 3.80ghz @1.3375v Asrock X370 Gaming X 5.20 Bios CM MA610P Aorus Xtreme Gtx1080ti Gskill Trident Z RGB F4-300016D-16GTZR @2800mhz SamsungEvo 250 2Tb Firecuda 1Tb WDBlack Corsair RM650X

vesoljc Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Jul 2015 Status: Offline Points: 13	Post Options Post Reply Quote vesoljc Report Post Thanks(0) Quote Reply Posted: 20 Apr 2018 at 6:23am
	Mobo is out, disconnected, battery disconnected, cmos was cleared. If I connect multimeter to marked pin and left/right neighbor I get a beep this is where my electronic knowledge ends... is this fixable?

cristy6100 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 15 Mar 2018 Location: Romania Status: Offline Points: 269	Post Options Post Reply Quote cristy6100 Report Post Thanks(0) Quote Reply Posted: 20 Apr 2018 at 5:41am
	Did you try disconnecting the case front panel power button, it might be causing the short and starting the PSU? Its usually pin 15 (ground) or another ground pin/plane (I dont know exacly) and Pin 16 (PS-ON) that start the PSU, but the motherboard circuitry receives power even when the PSU is "off", that is the standby power, true power off is achieved only when the PSU is manually switched off, until then the motherboard receives power. Can you try checking with the multimeter and the motherboard out of the case with all cables disconnected if it still reports continuity between any ground pin and pin 16 from the ATX connector? if yes, then there is a problem with the mainboard, because no continuity should be present if pin 16 is not shorted to ground, and that cannot happen if the power button on the mainboard is not shorted, before doing these measurements also please disconnect UEFI battery Edited by cristy6100 - 20 Apr 2018 at 5:47am
	Main Rig: AMD Ryzen 2400G \| ASRock Fatality X370 ITX/ac UEFI 4.90 \| Corsair LPX DDR4 2400@3200 1.35V \| Corsair RM650i PSU \| CM ML120L AiO Cooler

vesoljc Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Jul 2015 Status: Offline Points: 13	Post Options Post Reply Quote vesoljc Report Post Thanks(0) Quote Reply Posted: 20 Apr 2018 at 4:32am
	also, humidifier function was already disabled

vesoljc Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Jul 2015 Status: Offline Points: 13	Post Options Post Reply Quote vesoljc Report Post Thanks(0) Quote Reply Posted: 20 Apr 2018 at 4:26am
	omfg... pin 16 on the connector (the PSU_ON - green wire) on the board is shorted with the ground! I used a voltmeter and it fakin beeps if I do a connection test on pin 15 and 16 ffs

vesoljc Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Jul 2015 Status: Offline Points: 13	Post Options Post Reply Quote vesoljc Report Post Thanks(0) Quote Reply Posted: 20 Apr 2018 at 4:12am
	It's like the green wire is constantly connected

vesoljc Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Jul 2015 Status: Offline Points: 13	Post Options Post Reply Quote vesoljc Report Post Thanks(0) Quote Reply Posted: 20 Apr 2018 at 4:10am
	SSD is not the reason, the power on behavior is the same if the disc is fully disconnected. When I plug in power cord, only the psu powers up (fan starts spinning), but power usage meter is showing 30W draw in this state. I tried this: if I unplug the 24pin cable from motherboard, connecting the powercord does nothing. Similarly, toggling psu power switch does nothing. As soon as I connect 24pin the psu powers up, clearly indicating that the motherboard is giving "orders"... The psu is brand new bequiet sfx power 2. Before that, I had this setup in a different itx case with integrated psu and the behavior was the same. So, I'm pretty much blaming motherboard...