MISSING STANDBY VOLTAGE ON AN X570 BOARD || MSI X570 A PRO REPAIR MOTHERBOARD FIX
hello and welcome to another video Today we have an MSI X570 uh board on our bench Uh this is a Where's the model number of this there's the model number MS7C37 Uh no idea how MSI calls this board Normally there's like a sticker somewhere but that probably isn't here anymore that says like what kind of board this is This is probably procarbon pro gaming something like that that doesn't really matter much We want the model number that we have there That is the most important thing for us And I do not remember what is wrong with this board So before we start it up so that it doesn't blow up in my face let's do the initial checks for shorts So let's start this time at the 12vt input That looks good And now the 12vt into the face That looks also good Then we take a screw hole for ground Let's see that this is grounded properly Yep We're going to check 3.3 volts looks good 5 Vssp looks good 12 volts looks good The 5 volts looks good Let's see The 5 Vsb is a little bit low Let's check that in a in a smaller range What is that 350 ohms Yeah 350 ohms Okay it's a little bit low but let's not get hung on up on that too much for now At this point if we don't do visual inspection now we can safely plug something into here and then see So let's get a 2,200g and let's plug this into here Let's get some of my test tools So we're going to be using a DDR tester This is for post codes of DDR There's also there's Q LEDs here I think Let's see Are there Q LEDs here somewhere for debugging yeah there are LEDs right there for debugging But let's also get one stick of RAM into here Stick of RAM And let's get also the test card onto here that I have And we want the TPM header the header right here Let's see if that will have good enough contact for us to see And let's then go for power consumption We can also do the test for [Music] the for the voltages if this starts up for the voltages of the RAM So let's give it power 30 milliamps That is way too low This seems to not recognize the CPU I do not think that we will have a reaction to the power button There seems to be some major ply rail not running Yeah we do not have a reaction to the power button Okay So I think our 3Vs might not even be running because that is very very low power consumption and there might be there pretty surely is something wrong with our 5 VsB line So let's go from there then Let's get some of these things disconnected Let's see that the five uh VSB line isn't being pulled too low So let's get a ground connection Let's prop the 5V Yeah the 5V looks fine Let's see There's probably the probably our 5V dual is missing and our 3 VSB is missing because currently I cannot see anything on this board The three VSB is I think coming from this here Is this 24 pin connector damaged cuz it seems like that our 5 VB is getting nowhere Let's see under the microscope Let's go here to the slot Doesn't look great around here but it should be fine Is there anything Doesn't look like it's sorted or anything but we definitely do not have our rails that we should have for passive uh standby This is the 3V that should have been started up already And let's see we have this as an input probably And we have no voltage here Yeah we have no voltage here So we also won't have anything on its output which is probably like this right here or even that one We have nothing So something with our 5Vs is not is not right It's not getting anywhere Can we see the trace where the five VP is going probably not Two three four The from the fourth pin I cannot see anything Let's flip this board around and see on the other side if there's anything to be seen here So it should is supposed to be the fourth pin from the top This one It's this big rail going down here Oh is there is this just dirt no this is just dirt Okay let's see But this Yeah this big rail is continuous So we will have to see where that 5 Vssp goes and why we do not get three VSB on this board So let's check a board view But how if that 5 VB goes through like a fuse or something before it can pass all the way to the 3 Vsb or if it first has to create 5V duel maybe and then goes to there and our 5V duel is not being created So let's check that So this is one of the points where the 5 VB is coming from coming in onto this regulator And let's see this regulator has nothing on it 5 volts there nothing there and 5 volts there Okay interesting Let's search look further This right here is supposed to be the 5V duel I think So let's check here This should be also present in standby So we do not have anything on this middle pin here [Music] Um we do not have anything there And that is the 5 Vssp So the question is why do we not have this output is it because this here is not present and this is coming from that chip I have replaced this thing before So that is probably what we are missing Let's see down here There's also supposed Yeah this regulator right there This is also being fed from the five VB This is probably from that pin Yep And the other ones are also not pre this is present but this is not present Okay And then also the regulator for the SIO is right No not that one that one And this is supposed to have three volts on its output if it's running and if the 5 VB is getting here So is this the output 2 and 1/2 volts This is kind of low It's not getting hot And the SIO is also not hot Oh this might be not the output This is probably the output Huh This will probably No also not What is its input oh the input is only 4.2 volts That is not correct That is weird Why is there only 4.2 volts coming here it's hard to see because it's traveling into the board right there through these VAS Let's see Do we get a Let's turn the voltage off and let's see again There was 300 300 uh ohms Yeah 20063 260 ohms So we might want to inject 5 volts into the 5 VsB and see what happens then and go from there So I currently have 5 volts on my tweezers And when injecting we only get 30 milliamps of power draw So there's definitely nothing getting hot with that kind of power drum But let's see if if the uh voltage is still low at our SIO or if it's now the full voltage the full 5 volts that should be coming in here Yeah now it's the full 5 volts coming in here and it's also generating the 3.3 volts So something about creating our 5 volts duel here is wrong I have seen the 5 volts duel not run because of a stuck BIOS So let's try to reset this BIOS And we might even want to just go over to flashing it So let's take the SMOS battery out There should be a clear SMOS header There's a Jbat header which is probably the clear semos header in this case Let's see Is there There seems to be another one We're just going to be shorting them all just to be sure And now let's connect up the power again and see if it had has changed if a BIOS reset was enough here No we still have very low power consumption So let's go into detail why this 5 vs uh 5V dual isn't running here because as far as I know it should be present in standby mode right from the get-go here So let's see we have the gate takes the three VSB derived we have five VSB coming in there and then the five-fold dual So do we first need it might be that we first need the 3Vs in order for this to work What does this take in no this takes 5 volt dual in first Yep So the 3Vs is only being enabled by the 5V duel which is coming from here So we will have to check this gate I think this let's look up what this is supposed to be for a part So this is a P channelannel MOSFET So if the gate is low we should have drain to source connection Uh drain to source So two to three On three we have the five VSB On one is that chip and on two the drain is our output and our gate was low I think So why is drain and source not connected or did we have voltage on our gate i don't think we did What is this being controlled by this is being controlled by the sleep states and by the three VB VCC DRV Uh these are coming yeah from that P channelannel MOSFET and that capacitor and this is connected to where this is just for yeah this is connect to VCC3 So this is later in the whole startup What is this VCC 5V where is this coming from 10k ohm resistor to ATX power Okay So this is later in the startup procedure and this is VCC5 Yeah this is also later in the startup procedure This is VSB 5V This is also called like that And this is is what is this a 10 ohm resistor to ATX 5 Vssp So we will have to check that uh the 5 Vssping to this 10 ohm resistor into pin 2 Let's check that that is actually happening So let's get power in here So we want to see f the 5Vs be on that and we want to see it here and we want to see it in pin two right there which we do Okay So that is all there Then let's see further So pin three is just ground Pin 4 is S5 mode And for that we have a resistor right here 47K where 5 VB is supposed to be connected from And then we have the output of one end channel MOSFET and the gate is D S5 and ground So we will have to check if this is 5 volts on pin 4 and if it if it isn't if it's pulled low by this or whatever this is right here S5 mode also base in uh this this is not this is a NPN transistor instead of a N channel MOSFET with a base emitter collector Okay So we will have to see if we have base voltage then or base current in this case in order that the collector and emitter is connected in order to pull this low So let's see if that signal is being pulled low So let's see on pin four which would be connected right there we have five volts right there yep so that is present that is not our problem so that 5 volts reaches there as well but I'm running out of options then so um we have those are supposed to be low That is low That is 5 volts Uh no this isn't low Pin two has five VSB And then we only have sleep state three left and sleep state five left And these are supposed to be low So is maybe this MOSFET dead I'm not too sure What we can do we can just um short drain to source and see if this board comes to life Let's try that So I have some tweezers here Let's look at the power consumption when I shot these two That was very high power consumption I don't think that that is correct Have a look at that If I connect this and that there's an amp of power consumption instantly Is our 5 volts dual maybe shorted let's check that our five volts duel is shorted That makes so much sense why that isn't working Then 2 ohms on 5 volts 5V duel That makes so much sense why that isn't running now Good to know Good to know Our 5 volts dual is shorted Let's go into injecting voltage and getting our thermal cam out and see what on 5 volts dual is actually shorted So I let's first because I really don't know in which area we're going to have a look at I will be uh having the thermal camera right there Let me get the setup ready for injecting voltage into the 5V duo So connecting one side of the power supply to a good ground We're going to start up with uh a single volt That should be enough because the short seem to be pretty bad Uh I saw like 2 ohms So one volt of uh voltage and it takes 6 amps And let me quickly find where those Oh they right there Okay let's zoom down That should be it then already So that you can see it Let's put it right Oh no I need to inject into there Let's put you like this Get the ring light out of the way And we should be in this area right here And right there something right there is heating up as you can see Let's go from Yep Let's get our macro lens on here Go closer to that area Let's have a good look That looks like a single capacitor right there that is heating up Can that be let me locate it better So let's go into the board view and see what capacitor might be connected there on that line So in the board view let's see we have the 5 volts and it's probably this capacitor that the 5V is getting into and that is getting hot or this one One of these two Let's go under the microscope and see for these two So it must be one of these two in this area Um let me let me see exactly with my thermal camera just for myself to see which one of these it is And it's the bigger on the left Yeah now I can see it It's the big capacitor on the left that is shorted We can also visualize that by let's take some IPA get it onto this area right here And let's now inject the voltage I think I need more But you can you see that already no We need a lot of IPA Let's get some more in here Let's flood this area Good And now we can see it moving And now let's go for a little bit more voltage like 3 volts instead of uh 1 volt And now you can see it clearly Yep that left capacitor is dead That is great to see great to find So let's get rid of him and let's clean that area a little bit It looked very gked up So just using the IPA that we had just going to scrape it a little bit here And let's remove that capacitor So what we are going to do I'm going to be taking my soldering iron and we will be flooding this thing with a lot of solder on both sides And we're just going to be trying to remove it like that so that we don't stress the board too much Just heat it up from both sides at once and trying to get rid of it like that And gone is the shorted capacitor No capacitor No shorted capacitor as we like to refer to it So let's clean this area up Cleaning up our solder parts And now getting rid of all our flux right here So area looks clean Let's now do the resistance check So resistance on our 5V duel is now high Let's go into a higher range Let's go in a 20k ohm range And there we can see 1.3 k ohms on 5 vol duel Very good to see Let's get rid of the injecting voltage
setup Let's go to the overhead view again So big moment of truth As soon as I hit the switch I want to see 120 milliamps or something like that of power consumption H that is not what I wanted to see That is 30 milliamps Do we still not have our 5V duel let's see now Uh let's go into voltage 1.6 Six volts Is it getting hot why is it so low 5 volts is there 1.6 volts from there Why is it 1.6 volts that is very weird Did it get damaged let's once more connect the 5 VSB to the 5V dual now by ourselves And then we can see the actual power consumption There you can see it 130 milliamps And I bet if I now try to turn it on it would turn on when doing that So we might need to replace those components there They might have been shot So let's see Connecting this and that and turning on the power button Yep it definitely wants it turns on As you can see now we have a CPU LED We have uh changing amps Let's see We might even be able to get a picture out of here with having it jump started like that Let's see for the post screen That is still the old post screen We are on a boot LED And there's the new boot screen Yeah it definitely turns on now But that was after I jump started it And I think our MOSFET is dead Yep there is the board on If I now turn it off we're back to the state that I cannot turn it on Now the board is off You can see 32 milliamps Yeah I think uh some something there is dead Um it's what what is more likely is it the MOSFET or is it the control chip i would think that the MOSFET is probably that dead because it will have taken all of the um it will have had to provide all of the voltage to that shorted capacitor and I would expect that it has died in that process So let's get rid of the post screen So we're not quite done yet We probably we will have to replace this MOSFET PO6P3A So let me see if I have a replacement of that on any of my boards One moment please And right here we have a PO6 PO3A on a completely damaged board This was my very first attempt on replacing a PCH with a reworkstation back in the day This is like it's been I think two years since I did this mess and this board is still a great donor board to me So let's desolder that And if necessary I think we also have the control chip right there that we might need So let's first get the MOSFET off Try with that And if not we will come back for that control chip also So let's get some solder into onto here onto each and every pad Some leted solder that we have a lower melting point that we it will be easier for us to remove this thing Kind of like that Each pin has some leted solder on there Let's get our hot air station and take our MOSFET off of there The MOSFET is out Let's now go to our original board or patient and let's unsolder the MOSFET from here Let's do the same Let's add some flux onto here and we will get let it solder onto here Get it on each of the pins and also onto this tab right here And let's now get the hot air station and blast this thing off of here And while the board is hot let's get the replacement into here The completely baked chip Oh and that is shifted a little bit too much for my liking Should be fine Like a new MOSFET right let's clean up the area while everything is hot here so that we can get rid of all of the burnt flux So area looks fine now And let's now see if we have the power consumption that we want and actually have 5V dual So moment of truth number two There we go 113 milliamps That is what I want to see And now we will have our 5 volts here Let's see for our 5V duel right there 5 volts Very great And just once more now just to see it working perfectly fine And we're going to be connecting everything up And let's hit the power button and go for our victory lap here Let's get the pause screen in here And actually hit the power button while it's connected and not again getting off There it is And now we can have a look at the post right here CPU LED Boot LED 2.7 and 3 amps We should get a new picture every second right there Also let's see Going through boot codes 5 amps of power consumption There is the new picture Great to see Let's get an actual BIOS splash screen in here Let's connect some USB Oh there's an actual biosplash screen It already did that by itself And as you can see we can now go through here And yeah that is great a shorted capacitor on the 5VT dual line that has destroyed a MOSFET that is creating that line And that's all we had to change So the spot got a brand new MOSFET one less capacitor and everything is working great Love repairs like this one This one I hope you enjoyed the video I hope you learned something in this All of my tools as always are linked in the video description This was MainBot Medic Thank you very much and goodbye
2025-04-29 05:34
