How to diagnose a laptop motherboard - motherboards repair lesson

hello so we are back Wednesday yeah and let's try and fix something okay because many of you guys asked about motherboard repairs I don't know why because actually fixing a motherboard it's just a small part from a business yeah so you probably you're running a repair business or you're looking to learn a motherboard is just a small part what are they important have anyone asks you know it's it's okay we can do we have a motherboard yeah so we have a job but this is not for repair okay so we need to put a diagnostic on this motherboard which are stand pounds because we are supporting like self repair so it's okay you know this was all was booked in 11 doesn't mean yesterday for diagnostic let's diagnose this board maybe we can learn something yeah ok ok so we have a nice mother bore what I'm saying is nice it's nice because you can see straight away you know you have a dedicated graphics chip this is a nice one you know the laptops have two types the cheap one without the graphics chip it's just the it's empty place or the one with the graphic chip ok so this is a nice one this is a nice one probably i7 processor nvidia graphics yeah chipset ROM memory Wi-Fi card a lot of video RAM it's a nice motherboard so we have to diagnose this board and you know the customer will pay if we if we can say you know what does the problem that's your fault yeah usually this will be very short well because it's a video and I try to help the others with these kind of things who try to make this more clear okay so what we can check first we have nothing we don't have screen we don't have charger we don't have charging port we have nothing I think the first step is to recognize how much you can from this motherboard so we have no schematic cells of all so yeah we have no schematic no more view we don't even know what laptop is I have no idea so what we can see here are big port here which probably this is the charging port the charging port must be connected probably here processor power supply some load is equals MOSFET coil MOSFET and we have a big chip so probably this is a processor power supply another important power supply probably this is the graphics one what we can see more more power supply each coil it's a power supply yeah other power supply here look another power supply here you can see the path we remember we spoke about that coil two MOSFETs and a city capacitor oil probably these two MOSFETs or diesel coil MOSFETs yeah output capacitors input capacitor coil to most coil to MOSFETs probably this is the round power supply coil to MOSFETs another power supply here coil to MOSFETs another one here coil to MOSFETs Realtek chip here from you can see the I can see that the logo so I suppose here probably have like how would you speaker connection or probably not probably this is going on audio board because I can't see like any jack on the board I can't see any Jack so it's not Jack here so I suppose we have a audio board yeah what about on the other side RAM memory okay on the other side what do we have on the other side on the other side we have the super i/o chip Lenovo so I suppose this is a Lenovo laptop you can see but because of the light you can see it's a Lenovo what we have more this is a USB support so I suppose this is a new motherboard that's USB see yeah Oh a fuse here a fuse he refused here yeah okay so that's what we can see on this motherboard we have to buy ships here by actually you know it's but because we are saying bias while I'm memories yeah one two they have a special shape maybe you can see better under the microscope let's try it so that's what I mean when I'm saying you know they are different then they looks different those chips yeah you see this this is one and that's the second one twenty five q8e yeah does clear and this one twenty five be 64 year 64 bits BIOS chip probably okay let me switch back so yeah yeah let's go on the next step I did have few comments about the video so they say people ask me to edit a video from the repairs the problem is I try to keep this channel real and yeah I can tell it from beginning I am too lazy to edit the videos it will take me some time time which is not from the work time probably from the family time which is not good for me but the second problem is editing a video you don't have idea about how much you spent on that job and how much you will have to spend on that job to just have an idea about the price what you last for that kind of job worth to be repaired you know and I'll tell you a funny thing like few months ago we wasn't that time not a few months no no no it's more for like one year or more what we that damage on the iPhones long screw the damage yeah no screw damage is that kind of repair which you are doing for a video to show something look I can do this kind of jobs you know but it's no way to spend time like on a regular job you know I just you know okay lost or damaged yeah let's take the job let's fix it no you can spend hours you can spend days on a job like that and I know there are people that just they have video like short video like for a half an hour video one hour doing long screw damage and rebuilding all the tracks from a lobster damaged this is insane you know that kind of job and we do have that kind of jobs here and the owner comes and he said you know what I did check that the YouTube it looks like a easy job you can do it you know because the people are making video they just cut it editing and you know finally you have a half an hour video doing like a full day job you know he's not even one they can be more I remember I work on one project do two days but was a data recovery it's no way how he can make a video two days video but anyway yeah he didn't get too well and I told him you know actually that's that's the kind of like a top job he sees it's it's insane you know what I mean long hood that may just crazy you know that trucks you have like in one millimeter you have like a lot of trucks okay but you know what you can do it can be forward the video it will be more simple yeah so let's start with this modern world no let's start we already we identify the things next step I'm trying to think from like a beginner what beginner will do it's hard to think what all our beginner will do the problem is on the channel we have beginners like very beginners then they they see my video like wow it's nothing wow we have the middle class actually they do understand what I'm doing and we have probably the high class for them they did just boring videos but from a beginner point if I will beginner what I will do in this model how do I will check this motherboard because everything it's like a unknow you know it's it's it's not we just random things on the board that's probably that's what a beginner will see on this motherboard they saw the random thing but it's nothing random so you have to find and start from something and maybe can be funny but when I was a kid I was starting checking randomly things and I'm sure a lot of beginners they are doing this checking randomly things and I'll speak a common mistake here common mistake yeah they're checking okay they have idea about the power supply's and they are shaking capacitors okay a cup okay let me get out a multimeter down most checking capacitors and this is not sure that that's what that's what probably they are doing they are checking the capacitors let's check another capacitors these capacitors this is no should you have different readings there see like here okay is you know point one so it's not sure like that okay check random things here on the board capacitor because I have a lot of short capacitors which is probably most common fault another capacitor here with different reading on the multimeter which means nothing yeah is checking random things and we have a mistake yeah common mistake the people checking this capacitor here so let's check together this capacitor okay 0.008 we have a short because I go I got a lot of emails I probably like 60 70 emails every day and they say they start checking things on a motherboard and some point they check this capacitor and short more of that here more of that they start checking MOSFETs checking MOSFET [Music] yeah you can see on the show me nothing okay this is show me nothing they check this MOSFET yeah this yeah okay this one they check this MOSFET let's check together maybe not this one no did not this one yeah this one should be maybe this one one second I think is this one this one yeah checking this MOSFET 0.08 one more time 0.008 we have a shorted MOSFET you know what I mean I I got a lot of emails about this let's have a look under the microscope okay one more time one more time one more time obviously this is a power supply with two MOSFETs a coil capacitor checking the capacitor 0.08 yeah checking the MOSFET here we have two MOSFETs okay 0.08 look on the MOSFETs here we have three pins together here this we are together solder together these four are soldered together checking so these are four solder together check this for with this free 0.08 so how you can explain that I'm sure like if you have knowledge you can explain very easily this kind of this is not a fault this is not a fault let me grab the I don't have a pen let me grab a paper here you more second [Music] okay just ex used to explain it is fold so let's draw this power supply which is like any power supply from this board you all are the same so a power supply you have two MOSFETs I shall make that square okay let's make that square will be more easy so what did we see there yes three pins all connected to ground yeah that's the ground four pins all connect together yeah they are together and obviously is going on the other MOSFET which has three pins all together and this they are connected together again and this one has four pins which they are connected together and this is plus okay here I should have nineteen we have these those capacitors yeah let's just stick the schematics out from from the motherboard so this is ground EF 3 pins 4 pins together here you can see 4 pins together here 4 pins together connect straight with the 3 pins from this chip and these four pins together it which is plus I told you has a capacitor connected reground because these three pins are ground this capacitor ground so this is a ground area okay so one more time we have two capacitors here ceramic capacitors connected to ground ground okay this is a pressure power supply as to fill two phases are two power supplies for the processor but let's get concentrated on this one so from here we have the coil coil and after that we have the the black capacitor which we tested yeah that's it it's a electrolytic capacitor connected to ground and from here this is a power processor power supply processor and what we have here from here to ground yeah we have 8 ohms and this MOSFET yeah you don't never recheck the math this MOSFET here and to ground yeah we have again 8 ohms okay the explanation is very simple I give you a second okay the secret of checking yeah you come with a multimeter here or here actually yeah you are checking not the capacitor if you go with a multimeter here the electric circuit will not be on this side will be on this side so now your multimeter will be from here to the ground okay you check the MOSFET the circuit will be from here from the MOSFET obviously is going from the coil coil is just a wire here is coming to the processor and to ground so that 8 ohms is actually the resistance of the processor okay checking the MOSFET you don't check the MOSFET you think you check the MOSFET but actually you check the resistance of the processor based on the you know on the on low enough II no not not on the on low and the kick of low the current will the current will go on the shortest way to the ground okay and the shortest way is the processor which has 8 ohms and does the common mistake you believe actually have a shorted MOSFET or a shorted capacitor is not OK you know III want from long time to clear this mistake they say I got a lot of emails people ask me for herb look I have a shorted process I have a short that no shorten MOSFET and shorted out food is not 8 ohms is normal even on the graphics on the graphics the Chicana graphics on the graphics power supply compare we ground yeah like two ohms yeah you can see this is the output yeah the output of the of this power supply the even the graphics has a dual phase power supply so if you check this MOSFET if you check this mas well I think that's the one no this No okay no these to our channel these two are connected to plus these two - okay I got it now maybe I'm not touching let's shake together let's see together what do we have here so we have two MOSFET and the capacitor is here here should be this one but where this is going now this is the plus one this is the plus those are connected to plus these are the top MOSFETs and this is at the bottom one and the bottom one give me already how this is possible okay okay let's clear this so this is the coil coil connected to ground zeroes capacitor the output capacitor the output capacitor zero you see like two ohms we can see on the multimeter 2 ohms so what I am checking wrong this is a bad example yeah this is a bad one actually I try to prove a point but I can't prove it because these are dual MOSFETs yeah so each mosfet is dual you see this truck which is going under the MOSFETs actually solder behind here why I'm saying it's a dual MOSFET because you have two gates you have one gate here you can see this pin is a gate nothing is on focus okay the is that the second gate here so you have a dual motion so inside of this MOSFET I actually have two MOSFETs okay same here - MOSFETs same here you can see they have two gates same here - gate okay so we cannot check that every because these are dual MOSFET this one from here I've not dual you know the processor ones no or not abnormal you can see it's very easy to see because it's only one gate one gate here here you have one gate okay but you'll do probably same a thing like with the processor you're going to check this capacitor the electrolytic one plus minus and you will see okay I have two ohms so we have a short no you don't have a short that's normal okay but you have to start from a point when you diagnose the motherboard you have to start from a point and the point which I will start is the charging port connection so let's check together you see the input okay so the input of the power on this modern world is like that you have two pins at two pins and you have the middle via two pins two pins and a middle pin we don't care about a middle pin to find which one of these two is ground there is it two pins to carry more current that's why you see two pins connected together so I'll put one promo on the ground and I will check which one is so this is not ground but this is zero zero so this is the ground so on the charging port here we have the ground here we have the plus here should be 19 volts plus we can see the truck is going on the other side of the board let's check the other side of the board what is going and the track is boring yeah you can see where it's going so you see the connector the pins of the connector again Plus this is ground check this with this is zero because this is ground yeah it is zero so what we have here we have a fuse fuse which is good zero zero you can see we have some carbon resistor which are loams resistor zero zero you can see on the multimeter and from here is going again on the other side of the board yeah make the other side of the board on the other side of the board is coming here this is our first MOSFET so my 19 volts coming here four pins all connected together three pins connecting together yeah so it's coming out here this free are connected with this free which are together so my 19 was coming here is coming here and is going out here all four pins are connected together yeah they use more pins from the two reason one to carry more current and two is to release the heat you know you have like four connection four pins you can release the heat more easily from the chip okay so you have four pins and this is the output so here you have 19 volts those MOSFETs are just meant to protect the motherboard in case something wrong happened like overheating like a short so they will cut the voltage it's just extra protection because we have a radio profession on the charger it's a extra extra protection it's always welcome yeah now this is the output on the output they have a bridge Ashley is nice the fact that you give us opportunity to easily the parts of the circuit on a motherboard and we have a current sensor our current sensor is just a loams resistor yeah you can see on the multimeter and the multimeter we have zero on so you cannot check we cannot check exactly the resistor is a very low resistance probably we can but like 0.05 or something like that yeah and from here you have two tracks yeah which is going probably some power management chip okay this is how would your chip this is not the poor management but we don't care that's something else here this is not point checking the power management chip we do if we don't have a power problem we don't know yet because we didn't test it with the power to see exactly what is doing what I'm trying to do is to draw the schematic so from here yeah this is the point yeah yeah I'm working on a motherboard yeah that's your Sonya okay we don't know yet I just start now yeah so just give me like one more hour okay thank you oh that's crazy that the customer just went here with the he was here with the mother what asking about this motherboard Prabhu Xu hurry up okay what do I want to make you understand that's the point where the input see repeat here let's say this is the input protection and things it's ending so whatever you see here this truck is the main power rail this is going everywhere and we will check together yeah we will check together so after the current the current sense of a resistor oh yeah this is the one this truck is going inside of the motherboard you can see it yeah the conceit is going on each power supply so let's take this one check on the multimeter you have zero zero yeah it's not ground checking with the ground is not ground this is no ground yeah so it's not ground yes because you see we don't have any resistivity with the ground this plus is going inside of the motherboard this is going here we have zero zero on the multimeter you can see the multimeter this one from the middle zero zero so my truck is going here yeah which is going more but it's like a star configuration yeah it's going everywhere let's see it's going on this power supply from here let's check on a capacitor the zero zero C is going here what about on this power supply from here is going here check on the multimeter zero zero so it's going here okay it's going on the processor power supply check on the multimeter zero zero yeah I'm checking on the the ceramic capacitor from here from this one's this ka each power supply each power supply they have these capacitors yeah so I'm checking on this point of the capacitor not on the ground not on the ground here okay let's check more is going on these power supply from here check on the multimeter zero zero see it's coming here okay on this power supply from here is going look look on the multimeter zero zero yeah we have here another power supply let's check here is going here zero zero you can check on the multimeter is going here what about more power supplies about this one this one is going here zero zero yeah so you see this main power hell it's everywhere and it's supposed to be 19 volts even one second less you okay sorry for that what we're saying about the schematics yeah so the 19 Welsh rack is going everywhere so let's draw what we've seen on the motherboard what we sin so the schematic should be like that so what do we have we have the charging port okay so we have two pins 4 + 2 4 - these two are together and I'll call me to ground yeah these two are together and is coming first on the fuse that's a fuse after that a carbon resistor which is the low ones resistance after that is coming on one MOSFET from this MOSFET is coming on the other MOSFET and from this one is coming - current sensor which you give me one second you this is the current sensor which is a Louis resistor and from here you remember we seen these two pins which is going through some power management chip the current sensor all this will check the current if something goes wrong here you have a short the current will goes up yeah the voltage on this on these two points will rise and the power management probably will cut down the power for these two MOSFETs okay and this is my main 19 volts power rail from here is going everywhere like for example yeah on each power supply remember we did check let's say like that it is going to the processor it's going to the graphics yeah from here it's going to what do we have more we have a ram yeah rom in each power supply the schematics of each power supplies this one yeah this one from here and obviously the MOSFETs you have a gate gate here you have a gate here the gates are going on some driver you know it if a chip which is driving the power supply it's reaching did these MOSFETs so what do we have more ram graphics processor we have 5 volts free volts yeah one is 3.3 3.3 volts another one is five okay I'm sure more so that's what we have done schematics of problem like any motherboards for a 999 % of the motherboards are like that okay and you have the chipset that's probably like another power supply well anyway that's not our problem our problem what do I want to check yeah this is plus here this is minus this is one MOSFET it's not important if you channel P or n can be to channel let me check let's see together so it's coming to four pin so this is channel and the first one channel N and the second one can be a channel P can be I'm sure the first one is channel then okay good so now after we know what's going on here we can try and diagnose the problem so what do I want to check I want to check what current is taking the motherboard here I want to check if I have 19 volts present on all these power supplies yeah and after that we can go forward yeah so let's take the power supply power supply we can see on the poster boy we have 19 volts I'll not connect the ground here on the connector because ground is everywhere so I can connect the ground like this like here okay mm plus here so let's see what happen we have a current limiter on two hands + and the power supply is taking a hundred 60 milliamps you can see the 160 the first one's 0.16 this point one six arms is a hundred sixty million ups this is a very bad news I'll explain why so most of the laptops just living on one side the MacBooks they are coming on is not the battery they are not on so now is nothing on so there should be nearly no current you should have some current Wallace check you know let's keep the plan first let's check the 19 volts 4 plus 160 millions multimeter and bless check again yeah first let cut on the current sensor after the two MOSFETs we should have 19 we have 19 multimeter sorry let me switch on words volts on that current sensor we have 18 point 819 it can be nightly let's make you 19 we have 19 you can see on the multimeter Daria yeah good does mean on the processor power supply I shall have 19 check on the multimeter 19 on the graphics for supply you shall have 19 check on the multimeter 19 ok when this power supply which I don't know what is doing we shall have 19 check on the multimeter 19 on this power supply we shall have 19 19 on the run power supply we shall have 19 check on the multimeter 19 so we do have 19 everywhere yeah so what do we know we have nineteen everywhere so this circuit is working yeah it seems like everything is alright 460 millions is not too much it is too much one actually the dope is not working so something from these power supplies yeah something is drawing up to ground 160 millions one of this we don't know which one yeah can be no one like it's probably a truck can't roll to the motherboard 19 words but probably not okay so somewhere 160 minions get lost for some reason it's not supposed to be like that okay so we can have like any power supply with these schematics this is schematics like any power supply and let's say we have a partial shorted MOSFET which is drawing here and to the ground the on this case in Troy through the processor like 160 millions or we have to shorted process on is drawing to the ground 160 millions or one capacitor is drawing to the ground 160 million 160 Millions so something is getting that power yeah what what will happen if something gets power the power cannot get lost the power is getting changed yeah we thought yeah it's getting changed on hit so yeah probably something is getting hot another 60 milliamps it's it is a bit of current you know it's not like so what can be logical speaking yeah from my experience a MOSFET if assured that is shortened you know what I mean if you sure that is short it's not like okay is partial shorter so he's taking another 60 million so probably has like how much a hundred ohms if he sure - sure capacitor the same the capacitor is not like partial short that will have like a hundred ohms if he shorted short the problem is if you have a shortened capacitor like on this key let's say we have a shorted capacitor and if that capacitor is taking 160 milliamps no one care so the latter should work fine but our board is not working so if I have this capacitor let's say this is partial shorted and this capacitor actually has a hundred ohms nothing will happen the motherboard still work fine okay so we don't have a shorted capacitor shorted MOSFET I don't think so a monster can be short or not simple what do we have more what do we have more what is always under the voltage on a laptop when it's off when it's off we have 90 volts everywhere that's under the voltage one power supply is running any switching the 3.3 volts one actually on the laptop you think you have two 3.3 a big one 3.3 volts this is high amperage ah high amperage which is 3.3 for the Wi-Fi for the hard drive for the DVD drive for the screen and you have a a small one a low power one for the chipset yeah here we have no no chip so sorry the super i/o chip super i/o chip what a super i/o is doing it's reading the power button yeah it's reading the bioship also probably on this one the bias is inside but that's not important right now in this point is important what is doing is reading the keyboard yeah the keyboard is reading a lot of things it's actually it's also it's speaking with the battery yeah on the data lines is starting everything yeah so this is important this is a start-up chip this is starting everything is starting all these power supplies yeah and he's starting the laptop soon as you press the power button this ship will start everything that's why he it's always under the power because obviously if is no power here if you don't have three point three how he all know when you press the power button or when the computer is on sleep and actually press the key on the keyboard so the only way he can know if it's always on this ship is always on now the problem is we have no schematics so I have no really idea where is this power supply three point three I know where is the super i/o but the easy way what you will do here if you are like on different level what you are doing this way you don't know which is the 3.3 volts power supply you don't know which pin from the super i/o is meant to have three point free super i/o is we check on Google if you find the datasheet here I ta2 ita2 to 6e 18 to 6 e okay now you'll learn on another lesson actually like on this case there is no way you can find something about this ship this have nothing to do in our problem nothing yeah so it's nothing on Google about this chip no data sheet nothing so like on this case you have no idea what that ship is doing I know it's sad but does the reality because they found on each pin we have plus and minus I can check with the multimeter if I have three point three okay what can I do more on this point if I'm lucky no let's think here so these three point three if this three point three is taking a hundred 60 milliamps is taking another 60 milliamps because the 3.3 volts power really short it around this one 3.3 volts the way out can I check three point three because I don't know when which pin is this on which pin is three point three I don't know what is this power supply I don't know what it is what how you can check it around that this chip you have a lot of capacitor which are connected to ground yeah I don't know five six seven capacitors correct you can check the capacitors if you have a short there or if you have a external bios chip now the the the the the plus from the bioship it's also going here so you can check strict on the BIOS chip if you have a short if you have a short at 3.3 volts power so let's try one our case just you know now like a beginner thing because it's no other way is no other way it's a beginner thing to check for 3.3 volts power L on the super i/o capacitors yeah so I don't want to spend time trying to find a 3.3 volts power supply because I can check straight here okay so let's see together see the ceramic capacitor you can see them this was this one ceramic ax was this one ceramic capacitor this one ceramic capacitors okay so let's check together multimeter let's switch the multimeter alarms diode yeah this capacitor good is not shorted oh no check on the check on a multimeter 0.01 so like 1 ohm okay maybe it's a coincidence maybe that capacitor is doing something else let's check on this 10.000 you can see 0.01 you can see check on the multimeter so these are zeros okay more capacitors this this probably is doing something else this looks like a capacitor from a power rail way it's not this is again zero zero you can see this is like 0.03 like 3 ohms maybe because I'm not touching 3 ohms okay about this this like 6 songs about this this is good probably this is doing something else this is doing something else so my problem is I have like three shorter capacitor which from my opinion does not know normal you know what's the point if you have two grounds to use a capacitor what we can do next year we remember we have to buy our chips bios we have like two memories which wish to pause this one it's a memory from the chipset because the chipset is next this one also can be a memory from the chipset yeah because it's near to the chipset ok I'm just going if if okay give me a second you okay so if if this one just I can hope is connected to the this is the bioship actually it's a bioship that's mean the pin number four in pin number eight should be shorted the pin number four is ground the pin number eight is plus so let's check P number four yeah because you have the dot here you have B number four and pin number eight check on the multimeter we have 2 ohms 1 ohm you can see so that's not normal and the other cheap memory the P number for pin number 8 this is not sure that you can see so I'm sure this chip is the memory of this one is the bio chip from the chipset and this one can be from the chipset can be from the super i/o sorry super i/o but just to be sure yeah because I'm not sure maybe it's what I'm doing here what are what I did okay maybe that lets say yeah let's say okay even the issue because I seen chipset we - we - memory chips - bioships yeah maybe this one it's also from this one but is getting power from that 3.3 volts power l what we can do we can check yeah I will take pin number as a pin number six and seven I'll use my probe to shore that pins and check the pins with any pin from the super area so let's check if it's not shorted to ground is not shorted to ground so I will check if I have zero zero we any pin from the super i/o okay check there yeah check on the multimeter zero zero does mean this pin is coming to the super i/o does mean does our buyers chip okay once they give me one second you okay so we know yes okay we have a shortly 3.3 volts here we have a shortage 3.3 volts on the power rail what we can do because we can find it okay let's find it you know just to make you happy let's find the three point we won't spoil it probably is getting hurt that's easy to be found nineteen okay it's taking a hundred 70 milliamps so the 3.30 should be a small chip or coil or which is probably is getting very very hot so we have the super eye over here that's hot so does a 3.3 volts power supply which ists which is gone yeah let's have a look together this is getting very hot so 160 milliamps is taking from this power supply nice try to see those capacitors connected to ground I don't know which one is outputting 3.3 yeah this is zero zero this is not normal to be zero zero appropriately this is the and we have a jumper here obviously this is the output not a 3.3 but let's say you know what let's I say you know we didn't found the 3.3 volts power supply and I will call my 3.3 yeah with 3.3 on the bioship you know that's a power LP number eight is a 3.3 volts power yeah let's see what is getting hot yeah 3.3 drown all over the current sugar on one amp and pin number eight yeah I say buy a sheep pin number eight and he's taking 1.6 amp 1.5 amps it's not on the limit what do you think is getting hot what do you think is getting hot let's try together so power supply power supply and by sheepy number eight yeah by a shape be number eight you can see the cheap yeah one more time P number eight P number e you see how quickly is getting evaporated because that cheap is shorted yeah so on this case we have a shorted super i/o okay I think we can check even the three point three on the on that jumper we have a jumper and that jumper I'm sure is four for three point three yeah you can see on the super i/o one more time three point three that chip is getting mad hot so that's the problem with this motherboard super is that while super iodide that's interesting let's have a look together so what is this here what is is doing here I didn't see this before okay so see this motherboard has multiple issues even this one is a switching power supply you see have a coil you have this which probably is a MOSFET this is a power supply but this this is something else u9 which has a power rail which is going here yeah give us a even a second you okay so we have a second problem here on this motherboard so one is the Supra which is dead and what do I think I think this connector because I can't see any other connector this one this one is from the hard drive the m2 hard drive this is speaker this is speaker this is from my audio board okay so the only place where the battery can be okay this is a broken connector here but this is not from the battery most likely this is from the battery if this is a battery connector and this chip has something to do with the battery that's how the super i/o died that's crazy I didn't see this before that's the power button here yeah that seems more logical because if you play on the battery if you have a issue in the battery I don't know you have two trucks yeah the clock and the data which is coming from the super i/o down to the battery and the super is speaking with the battery starting the charging stopping the charger is checking the level of the battery so that's the only way how the supplier can died because someone play on the battery or something wrong goes through the battery okay so probably the man will come back with the motherboard what he needs you need a super i/o but this I have no idea what it is then what is doing can be related to the charging can be but I was optimistic before because the BIOS is outside that's mean you can you can replace this chip and you can have a working mother board but I don't know about this one well anyway we'll see hopefully you you found this video helpful yeah this is a weird case when actually you have two phones not only one what I will do probably will replace the super i/o or remove this and I shall have a working mother board okay to not charge the battery but I shall have a working mother board but all speaking the customer will see maybe we'll do a second video replacing the the super i/o yeah so hopefully will be a second part yes anyway yeah that's what was a long video thank you for watching like and subscribe if you liked the video and see you on the next one yeah and probably yeah we do have few more jobs we'll see if we have some because it's very busy so it's very busy see you later bye

Channel: Electronics repair school

Views: 785,473

Keywords: diagnose laptop motherboard, motherboards repair lesson, learn to diagnose a motherboard, laptop board repair, laptop board tutorial, laptop motherboard repair guide

Id: GCLflqmne6k

Length: 81min 38sec (4898 seconds)

Published: Wed Jun 12 2019