Hi guys.Do you have any idea?What appears in the topic title is what is happening to my motherboard.Power button doesn't work.I kept this motherboard in storage for sometime but the last time i use it was working ok.A few days ago i use it to rebuilt a system using a good cpu good memory but when i plug the cord to the AC socket the motherboard powers on itself and obviously does not boot.It looks ok with no bulging caps, no burned mosfets.Is an Asus a7v8x MX SE.
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Re: Motherboard powers on itself when plugged to AC
Some boards can be set to automatically power up after a power outage without having to press the power button - that is, after power is removed from the PSU and reapplied. My P3 machine does that when you put the mains cord in, or switch the PSU isolator switch off and on.
You say it does not boot. I don't quite understand; is this part of the problem, or it just doesn't boot because there's no HDD/floppy/CD connceted?
Check the BIOS settings for an option, usually called something like "Auto power on after power failiure", and set it to off. Also, check that the power button is actually connected to the motherboard properly. If so, use a multimeter or continuity checker to ensure that the button is actually shorting the connectors when pressed.You know there's something wrong when you open your PC and it has vented Rubycons... -
Re: Motherboard powers on itself when plugged to AC
The bios may have the ability to power the board immediatly, if it lets you into the bios thats a good sign. Turn off the power feature that repowers after failure.
The not posting could be many possible issues but may also be bios setting related, or connections.JimComment
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Re: Motherboard powers on itself when plugged to AC
No, no.You got me wrong.The motherboard does not boot, i do not get any video signal.Cpu fan spins normally but nothing happens, no beeps nothing.Its BIOS is good condition(not corrupted).The problem is that the motherboard POWERS ON ITSELF when plugged to AC socket.It powers itself on EVEN if i TAKE the BIOS OUT from its socket.(Sorry about my english).Comment
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Re: Motherboard powers on itself when plugged to AC
Did you check the battery?Comment
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Re: Motherboard powers on itself when plugged to AC
does it do this outside the case?
with no front panel wires connected?
what is the cpu?
does the psu test fine on another pc?Comment
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Re: Motherboard powers on itself when plugged to AC
Exactly you described my problem perfectlyOriginally posted by willawake
I tried with durons and athlons and get the same results
The psu works fine with the others motherboards i have
It powers itself on even without cpu, without memory, without front panel wires connected !!Last edited by JorgeHernan; 10-25-2006, 11:47 AM.Comment
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Re: Motherboard powers on itself when plugged to AC
Try clear the CMOS !!******************************************Comment
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Re: Motherboard powers on itself when plugged to AC
That's the first thing i didOriginally posted by hkivanComment
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Re: Motherboard powers on itself when plugged to AC
Perhaps the caps are bad even without showing any physical signs. Teapo, for example, are notorious for failing without any sign of a bulge or leak. Also check to see if any traces on the motherboard look like they're broken. You don't need to test every single trace with a multimeter, just see if there's any damage on the reverse side of the board.You know there's something wrong when you open your PC and it has vented Rubycons...Comment
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Re: Motherboard powers on itself when plugged to AC
I changed 3 large green 1500uf 6.3 "KZE" capacitors located near mosfets already.Things stay the same.There are 4 blue small 1500uf 6.3 "OST" capacitors left to change.I am going to check the traces on the back of PCB before any capacitor changing.Originally posted by Tom41Comment
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Re: Motherboard powers on itself when plugged to AC
checking for a damaged trace is a good idea (on both sides of board), maybe the board get damaged when you remove it for storage. although powering on by itself indicate a short maybe so check also for a very small piece of metal shorting something. check the board carefully for any missing small component.
although i am not optimistic about this boardComment
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Re: Motherboard powers on itself when plugged to AC
May be a short on any trace carying the PS_on signal. Try it outside the case on the plain dektop or may be isolated with a sheet of paper. If that cures it, you should take carefully remount it.Comment
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Re: Motherboard powers on itself when plugged to AC
Probably bad PS_ON circuit - can be hard to trace. Also check the caps on the +5VSB rail in the PSU - if they're marginal, the PSU may work fine on some boards, but show this kind of symptom on other boards. Easiest way to check is with a known good, premium brand PSU.Comment
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Re: Motherboard powers on itself when plugged to AC
some boards power up to test themselves and validate config each time power is turned on or psu plugged in.thats why some systems come on several seconds after they are plugged in then turn off till you hit the on button.if cpu bad some stay on.Comment
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Re: Motherboard powers on itself when plugged to AC
that is true with my intel d875pbzlkComment
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Re: Motherboard powers on itself when plugged to AC
It's common for Intel boards.Comment
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Subject is a blank screen issue in HP Envy 17-3290NR 3D version laptop with motherboard Louis V1.1 6050A2489901 MB-A02. Production year is 2012. This one is a 2nd hand motherboard which I could use it for few months only. Suddenly no output from the internal display and also no signal from HDMI port then Windows out of order after few boots.
Caps lock working normally and no HP's caps-lock warning blinks. Making a hard reset and replacing the RAM sticks or using different slots didn't help.
Fans are spinning. Blindly could install windows11 and got the device manager... -
Hi, I have some 32 bits computer motherboards that need repair, as they fail to
power on.
Here are some examples :
(N.B. "capacitors" indicated here are electrolytic capacitors located in the onboard
switching supply area).
(N.B. #2 : I could not find a 3300 microF aluminum-polymer with a higher voltage
than 6.3 V.)
1 - Motherboard #1 : this is an Asrock K7VT2 (socket A) that still works well. To put it on test
I replaced capacitors with aluminum-polymer.
3300 microF/6.3 V. x 4 replaced by 3300 microF/6.3 V. (KYOCERA... -
I'm working on my sister's laptop: Asus VivoBook F510UA-AH51 - The motherboard died so I replaced it.
The original board was:
ASUS X510UNR REV 3.0 A
The replacement board is:
ASUS X510UNR REV 3.0 B (identical except B vs A - I couldn't find an A board anywhere. Visually they are identical.)
It boots right up on the replaced motherboard and everything works fine on the new motherboard - but it won't run off battery. When I disconnect the charger it immediately dies. When I plug it back in and reboot the system - it still shows the battery at... -
To save you some time: the most important bits are in bold.Some further examples/explanations or to the side & in grey - you can probs skip them if it's TLDR for you. Sorry, I've got ADHD & tend to over-explain stuff - just like I'm doing right now 😅 Briefness is for poets not me 🙈
Please help!! 🎶I'm just a girl in a world that wants to scam me out of lots of money for any tech stuff/repairs 🎵 Seriously tho, I'm poor&I can't afford to get laptop diagnosis, especially if it ends up needing a new motherboard.
Where I live, all the tech shops are run by very...
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A few months out of warranty and it's dead as a fart. XPS 8950 with a 12th Gen I5, 32gb DDR5 RAM and a GTX1650 GPU.....
Symptoms it's giving are really making a coin toss between bad motherboard and bad PSU....I'm leaning toward motherboard, but there are some strange irregularities with this piece of shit system.
Basic test:
Upon connecting power cord, system powers on by itself (no button push) for a second then powers down...and then powers back on again, I hear a relay trip inside the PSU, and then powers down again and that's it. It won't do anything else....
Comment