Desktop Motherboard Starts / Powers on but does not boot / POST No boot No beeps/bleeps LER
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- Опубликовано: 4 янв 2022
- LER #177
ASUS H81M-E Motherboard powers up but No Boot No Post
Here we have an Asus motherboard that powers on but nothing else happens. So let's diagnose the fault on this motherboard and see if we can fix it.
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Richard
The Schematic used in this video is on the Discord Server.
Find it under MOTHERBOARD SCHEMATICS --> Asus Schematics --> H81M-E
Here is the invite link, everyone welcome
discord.gg/vam6YC8vwU
This motherboard previously featured on this video ruclips.net/video/AeeSMJ5hXss/видео.html - watch from 14mins to see where the smoke was coming from the 12V ATX-E connector
is there any update video on this motherboard ? if yes, please share the link. thanks
Dear Richard, It's a pleasure to see an experienced person who shares his knowledge in detail. Yours is perhaps the more practical and useful electronic channel on this subject. Keep it up.
Another nice video Richard, love the way you explain things, very informative for us novices👍
the video out looked loose to me, but it may have been the camera angle. luv ya work.
Jason Lanarch
I think it is OK but I will check. Thanks
Great video.
Tx for sharing 👍
You are welcome
heya, nice trouble shooting again and great in dept video
Nice work!!!
Very cool. Recently my M5A97 rev 1.02 has no post. Removed components one by one, tested the PSU, even removed the processor etc, no beeps or anything. Its 10 years old, built this pc in 2012. Got me through my Computer Engineering degree! Though I feel a bit dumb for not knowing what to check when I now have this degree, Lol. But it is hard without the schematic I guess. I enjoyed watching the process of elimination in your video. Question. How would you know if the PWROK isn't an active low signal vs high? I guess it would be specified to you somewhere in the software?
This channel has a nice discord - recommend it ;)
Thank you
Here is the invite link, everyone welcome
discord.gg/vam6YC8vwU
wow nice, were did you get all those boardview schematics? this is defently going to help me finding faults on my GPUS and on some motherboards I have.
@Filip Munk
All the schematics and boardviews are on the #LER Discord server - you can download them for free. New ones get added regularly. I put the link in the description to all the latest videos - but anyway here is the invite link
Learn Electronics Repair is now on Discord! Come and join the fun and let's fix stuff together, it's free and a nice place to be.
discord.gg/vam6YC8vwU
This info is also in the pinned topic at the start of the comments 😉
🎯 Key Takeaways for quick navigation:
00:01 💡 *Motherboard powers on but doesn't boot, previously had smoke coming from a connector when powered*
00:58 ⚡️ *12V supply goes only to the VRM, no shorts to ground from connector*
02:54 🤔 *VRM working normally but still drawing excessive current, causing smoke*
05:02 🔌 *12V connector powers only the VRM, problem likely there *
13:26 🪫 *CMOS battery voltage and current draw seem normal*
18:01 ⚡️ *All expected voltage rails present on PCH*
30:18 🟢 *PCH receives Power OK signal as expected *
32:53 🟢 *Power OK signal received by PCH as expected*
35:16 ❌ *25MHz crystal not oscillating, no clocks generated*
38:23 🧠 *Suspected faulty PCH, crystal replacement didn't help*
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That's actually extremely helpful and accurate, thanks
could have been dirty or loose pin/socket, pulling off and refitting might have cleaned the pins...Maybe! are the socket pins tight and a good fit?
Hi Richard have you done a follow up video for this i haven't been able to find anything.
Did you check the resistance and capacitance of the SMD capacitors on top of the PCH? I had to replace a few on an Alienware motherboard which had visible corrosion (after heatsink removal). I had moderate success in that I got it booting, but it isn’t fixed to a usable state because I didn’t spend extra time looking for exact replacements. Now if I went looking I could probably find exact and it may run without the stuttering at post, but it’s been sat under my desk for near 3 years, what’s a few more 🤷♂️🤪
Hi Infiniti25
I didn't check the resistance there but I do kno there were no shorts as all the voltage rails were present. Measuring the resistance across the PCH capacitors and comparing to a known good one (if i had one) would probably be a good diagnostic technique.
@@LearnElectronicsRepair measure voltage too.
It’s not that they might be shorted, they might not be able to hold a sufficient charge level to supply enough clean smooth power when and where required.
Not sure where I heard or read it but capacitors have 1001 failure modes and they aren’t always easy to observe and distinguish.
Perhaps the short that caused the smoke is now burnt away. Could have been hair or dirt & cleared itself.
Will you continue this reapair and previeus Asrock H81?
The smoke already came out so there are no more smoke left inside 😁😁
Ahh that must be it LOL
Indeed, electronics only lose their magic smoke once 😁😁
Having 2 dead PCH´s would be really unlucky.
You got that cheap component tester from aliexpress, can you actually fit the crystal to there ? Because it has SMD Pads where you could connect it.
I'm going to find a way to test the crystal, but honestly crystals fail like almost never in my experience.
I have an i5 and has about 11 ohms between vss and vcc pins on the processor itself. Does this mean the processor is internally shorted to ground? Or in other words, dead?
CPU/PCH Vcore is present, so the whole power sequence finished successfully; still no post.There is corrosion everywhere on the board; there's also the issue with the smoke on the 12V connector.
Hi John I could put this one in the sink and give it a good wash. It didn't look so badly corroded as some of them i find. But let's try that anyway. i'm really not sure what caused the smoke from the 12V connector - even when that happened I still had the correct VCore and it does not supply anything else other than that VRM.
Possibly there is a small capacitor right by the connector that was breaking down under load and just burnt away hence the 'short' went away. Alternatively dirty pins in the connector could cause a higher resistance connection than normal, then get hot once powered up but that would mean quite a lot of current would have to flow and I would have expected the connector itself to look melted which it doesn't.
Regardless of thet, whatever caused the connector to smoke seems to have cleared itself. Quite obviously the 25Mz crystal isn't oscillating which suggests a faulty PCH to me as changing the crystal didn't make any difference - which I didn't expect it would as crystals almost never fail
I'll make a follow up video to test some of the suggestions made in the comments here and we can all learn a bit more
@@LearnElectronicsRepair Another H81 board with a faulty PCH. If at some point in the future you decide to replace it please don't use the BGA rework machine; give us the ghetto version.
@@johnprescott6614 Ahh well now that is an idea - I was thinking maybe of swapping the two PCH on the BGA machine to see if the faults transfer from each board to the other. If that proves to be the case then we can all assume both PCH are faulty. After that if I got two new ones I could replace one on the BGA machine and one using the Kada pre-heater plus the Quick 861DW (ghetto style as you say). That could be rather fun to try 😀
First though I would like to play around with the suggestions to build a crystal tester, and also to inject a 25MHz clock into the BGA to see what happens
I'm learning the same as everyone else with these experiments but the results I am sure could teach us all quite a few things.... and that's the whole point of this really. 😉
Hey what do you think is wrong with my computer. I was using it to mine just fine. And I stopped and tried to go back in to it and when I click the power button the psu and the cpu fan comes on then shuts off. Any idea off the top of your head what it could be?
Also can you use a regular speaker with a headphone jack on a motherboard to test for bleeps?
@@westhyphy The little bleepers are generally higher impedance than a normal speaker, but motherboards used to use a little speaker like a small transistor radio speaker so it probably would work. If you mean to use a little amplified speaker (like stereo PC speakers with jack input as you mention) then that should work just fine.
Too many possibilities to answer that in any useful way. Could be the PSU, could be a short on the motherboard, could be a SIO/PCH fault. Could be a corrupted BIOS, could be lot's of things. You need to get the motherboard out on the bench, disconnect everything from it and and start with the basics - known good CPU, known good PSU - then work from there. A POST Analyzer card would be useful, plus of course a multimeter.
Check for damaged USB, HDMI ports etc as the power and/or data pins could be damaged and shorted to ground.
@@LearnElectronicsRepair i have the asus b250 mining expert motherboard and in the troubleshooting booklet it says to try and clear bios and remove a battery. Does clearing the bios delete all your stored data??
did you ever find the fix to this board ? :)
Wish I knew what language this is in !!
change lm358 op amp .behind cpu
I'd give it a reflow using your fancy machine.
Yeah OK I can try that after a couple less drastic suggestions - such as finding a way to test the crystal and a way to inject a 25MHz clock
Motherboard power up or on
Rewrite bios maybe?
I don’t believe the BIOS starts until clock signals begin.
Just out of curiosity: why would you try to repair such an old board that can't be worth more than 20 or 30 bucks, other than for educational purposes? Any repair attempt would cost much more than that in time alone...
@Novgrorod
You got it exactly right I'm doing it for educational purposes. 😁
Just like with Graphics cards there are no skills or knowledge needed to repair the latest models that you can't learn (or teach) on older ones. In fact using older boards to learn is more cost effective than using newer ones. Having said that I do make a profit on this old hardware overall as the motherboards don't cost me a lot and replacement parts are mostly very cheap or salvaged.
How much is 'time' worth? As I am not doing this to make a living (my main business does that and is mainly subscription based so does not keep me busy most of the time) my time doesn't actually cost anything because otherwise if I wasn't making YT videos what would I be doing? I would be reading a book, playing games or going to the beach, that's what.
@@LearnElectronicsRepair Fair enough - actually more than that. Keep it up! :)