Strix Mobo repair, Screw driver slipped removing the GPU - LFC
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- Опубліковано 25 бер 2024
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13:43 I hope by this point he noticed the pads layout is NOT the same. some stuff swapped around. 19:35 oh no he didnt. sending prayers for a 0 ohm in the wrong spot.
Oh wow, good catch!
Yea I had to look 3 or 4 times after reading this comment before I spotted it. Monstrously subtle difference. I assumed it was in-circuit readings throwing things off, and the damaged components.
The question is then, why did it still work 🤔
Maybe those two are both just pull resistors, and the signal works just fine either way?
i went through the boardview and still no clue what that opamp is doing. the one u bridged maybe goes to 1.8V supply maybe nowhere . depending if a certain jumper is present@@Adamant_IT the one that has 500 ohm instead of 0 goes also to 1.8V but through a "programmable DAC" NCT3933U
@@Nebbia_affaraccimiei Yea, the swapped resistors don't appear to connect anything that sinks current, so no harm done. But that DAC might not be doing it's job. Hard to tell what that job is though, given that everything appears to be working.
Hi Graham, still can't thank you enough for saving my bacon so to speak. As some have commented, my gpu is rather large an MSI RTX 3060ti Trio. I could reach the latch with fingers but it was stuck fast and out of desperation stupidly resorted to a Mac Tools posidrive. The upsides of this fiasco are A , I'm not the only one and B, I get to watch a successful repair.
Many many thanks Graham, you're a star 🌟🥇🏅🏅
Pro tip: You can easily tell what that circuit basically does without a schematic. The 8 pin chip has 358 on it so it's a copy of a LM358 dual operational amplifier. The large cap is simply a decoupling cap tied between vcc and gnd so any nominal decoupling cap can be used (i.e. 0.1uF). The 4.7k resistor is part of a comparitor or voltage reference and the other side of the resistor should feed back into one of the input pins on that same chip. It's nothing special and highly likely any nominal resistor could be used, like 2.2k, 10k etc and it would probably work. Next time this happens look for common chips near the damage and look up the datasheet to see what it does. Often datasheets will have a reference circuit and a lot of the time those reference circuits are used as-is on other products. Alternatively find any similar motherboard schematic that is using a LM358 and the circuit there could be very similar.
So the shematic of this board says the big cap is a MLCC 0.1UF/16V (0603). The resistor next to it is RES 4.7K OHM 1/10W(0603) between ground and P_1V8. The next damaged Resistor is a RES 0 OHM 1/16W(0402)JUMP. The 500 ohm resistor is correct RES 499 OHM 1/16W (0402). The small cap at the bottom off the list is a MLCC 0.1UF/16V (0201). Well done without an shematic.
The 1.8V is for the CPU and prevents CPU init. without it eg. reading 00 on post codes.
if you look closely both boards have swapped 500 and 0 ohm resistors. They are on the same spot on the motherboard, but traces lead to different spots (and they go to matching vias in the end). That's why measurement's on both boards do not match
I wonder why they decided to use an 0603 size for that 100nF cap. 🤔
Great repair. To reduce the chance of damage when depressing that tab, use a chopstick. Or a pencil - use the end with the rubber.
i use a wood chopstick instead of screwdrivers, less risk of surface damage
I use a plastic school ruler
@@hmello3250that's smart
Not just a steady hand needed to replace those small components but also the patience of a saint.
And a damned good magnifying lens.
its called a microscope@@williamjones4483
You asked if anyone knew what that section of the board was for; the AS358M integrated circuit that those components were connected to is an op amp, and given it's proximity to the PCIe slot, is probably conditioning data going to whatever is plugged into that slot, in this case, a graphics card. Hope that helps!
If I read the IC's marking correctly, it's an AS358M which is a jellybean dual OP-Amp. That checks out with the top right 100nF capacitor acting as a bypass cap from VCC to ground.
As to what the section does - no idea. Since you said the board was originally stuck at POST code 00, it could have something to do with power monitoring to keep the board in reset until some rails have stabilized.
Done watching, thank you very much for the informative repair video. I have learned significantly more troubleshooting & repair lessons in this tutorial video and to your other repair videos as well compared to my ENTIRE 4 YEARS OF COLLEGE due to the rotten & outdated standards of education here in the Philippines. I hope you will soon have a mini-series for Schematic & Boardview-free Voltage/Power Rail Tracing[12V/18-20V Main Voltage Rail, 5V, 3.3V, CPU/GPU Core Voltage Rail, DRAM Voltage Rail, IGPU Voltage Rail, System Agent/Northbridge Voltage Rail, PCH Voltage Rail, BIOS Voltage Rail, Battery Power Rail], Proper method of testing/checking of potentially faulty MOSFETs & ICs/Controller Chips, CPU/GPU/PCH Reballing and BIOS Bin File Editing.
Thank you so much for sharing your experience and knowledge. I'm a ham hobbyist and love these videos.
Good tip for opening graphics cards clip wen rmoving them, Use a pencil with a rubber on the end and use the rubber end to open the clip, if you slip you shouldn't damage anything, also dont pull on the graphics card until the clip is fully depressed, meaning all the way back, id you pull on the card too soon this means you're adding pressure to the clip making it harder to push open, Great content as aslway, keep up the great work :).
It's always great when you have another device you can compare things to!
I use a plastic spudger for this very reason to get stubborn or hard to reach PCI-E latches to release. My new motherboard has addressed this problem (Asus ProArt X670E) - it has a button near the outermost dimm slot that engages a fancy mechanism that releases the GPU. No more screwdrivers/spudgers!
Well done. That was tricky
Checking the datasheet of the IC next to the zone you fixed might give some hints on what this section of the board is doing.
I could not capture the exact PN, but it looks like its "something-something"5358M"something", which does not give any plausible results to what this IC is.
from boardview its a dual opamp AS358 . has to do with the 1.8V rail
Great work Graham as always. Thanks for the video.
Damn I've done the screwdriver thing more than once but it's also so sketchy.
It's a great board. I have one myself. Never had a bit of trouble from it.
I see the boardview is available and opening it with Boardviewer (not flexBV or openboard) gives you the part values
seems to be setup as a dc low pass filter, with one output going back to the input through a small capacitor
Wooden chopstick is what I use to get graphics cards out with that release lever.
Great fix thanks
Very interesting video Graham thanks for sharing! since these components are taken from a laptop and this Ic is defined as a low power dual op amp in the datasheet I believe the power rating of the resistors and the voltage rating of the caps are also good enough.
10:45 - That is a 0 OHM resistor, it would be advisable to replace it, not link it, as it is 1.8v and a circuit protection for PU1501.
Nicely done!
Isn't it funny how a day after i also damaged my mobo in a similar fashion, i get this video in my feed? 😂
Yesterday i replaced my CPU and after i was done with the CPU cooler, when i tried to screw in the GPU i dropped the screwdriver(a pretty heavy one) on the motherboard, which left a pretty big scratch around the area of the sound chip, like a 1 cm scratch. Thankfully everything works fine so far.
Bought an Intel E version of this one so I can get into the fixing side of the house. Great video brother and gives me an idea of where to look once I get it
Back in the day I put nasty gouges in a few boards and/or knocked components off them when installing/removing/adjusting CPU coolers. This was back in the socket 7 days when heatsinks were affixed directly to the sockets using spring loaded metal bars. You’d need to use a screwdriver to lever them on and off, and they were under significant tension too, so it was ridiculously easy, if you weren’t careful, for the screwdriver to slip out and put nasty gouges in the areas of the board near the CPU socket. Which were usually filled with really tiny delicate traces and/or surface mounted components. This was long before I had the skills or equipment to perform repairs like this, so those boards were basically write offs. Sad, but you live and you learn.
Done it a few times but always been lucky not to damage board.. BTW Thanks Graham!!!!
Hi Graham. How much would you charge for a repair like that? Good to know if I damage a board in future and can send it to you for repair.
Don't forget the common third type of passive component... the inductor, which can read like a very low value resistor.
Enjoying your videos...
Nice to see I am not the only one with Air Borne components LOL nice recall.
Hello Graham, a resistor on the damaged motherboard was specifically giving a value of 500 ohms, but the undamaged one on the board motherboard gave a value of 0 ohms , I didn't quite understand why. I'm trying to improve myself in motherboard repair, so I'd appreciate it if you could answer.
notice the pads dont go in the same place, these 2 components are swapped
For anyone who hasn't tried surface mount soldering, some of those components are tiny tiny. And yeah, many are lost in the air flow.
Great fix
I have had to do this, on occasion, however, I am always careful, and never, ever use a screwdriver. Always use a soft (ish) thin wooden art brush handle. So far, so good.
Oh I hate those GPU ejector things. It's near impossible to get to, and they hurt the finger when you're trying to press them down. They really need to re-evaluate & improve its design. Seems we're all trying to press it down with screw drivers.
Another fine job done.
I've become weary of using the screwdriver to remove them so I ended up buying a set of chopsticks specifically for that
It might also help when no schematic to check the datasheet of that chip, look for a typical application and compare to what is on the board. Any maybe be careful with assuming "0 ohm resistor" with unmarked components. Might be a (small) inductor as well (which in fact IS a low-resistance wire in DC mode), so check inductance as well probably.
I cheered when it booted. Good Job!
Nice save
Ah yes the screwdriver to push the release. Done it, glad I haven't slipped up like that.
See, there's like 75-80% left of that first capacitor. You could have just measured it's capacitance and divided the result by 0.8 to get the full rating.
It works, trust me, bro. I've got a diploma somewhere! For something!
i got a similar situation with a Sound Blaster ZX Sound card with 4 or 5 rusted eaten up components ... and eagerly looking for a microsoldering expert in my Area....
have a question I have a mossfet that I want to change that had three pads or I'm sorry four pads on it to connect when I took the old one off now I've got one pad and a Big Blob across the other part I use a solder Wick took all the solder off but it's still a big long blob did I ruin something not real good at doing this
cool video Graham
Fascinating
Are you looking at eventually getting test bench for motherboards if you get more motherboard repairs into your shop?
I actually already have one, but I didn't use it in this video because I'd already opened up a demo PC to borrow its motherboard.
One tiny note. Min 13-14 when you desoldered the components. İn my view, you'd better wait for that area of the mainboard to get somewhat colder first, then measure resistance. Temperature has an impact on the resistance.
talking about board repair, is it posible to use one of the cables of a cat5e cable to repair a trace on a motherboard? just wondering, i have an am3 board that got damaged when client decided to repaste the cpu. but instead of repair we update all the platform instead.
I'm assuming you mean the strands, the wire itself will be way too thick. I'd get some enamel wire (aka magnet wire) though if you can, as it has insulation, so is less exposed than a bare strand.
I've got a ROG Maximus XI board with a three fan RTX 3050 GPU and a quite large Cooler Master CPU cooler and yes, it is a chore getting one's fingers in there to release that latch. Using sharp objects to get in there is not a good idea, however.
I use a wooden pencil for this task. Much safer than screwdriver. I have the B550 version of this board.
Modern GPU's are so awkward to work with. You have to be ultra careful with them. They weigh a ton, and you cannot get at the motherboard once they are slotted-in.
Note, make sure the pencil has either rubber at the end, or just plain wood...
the socket catch mechanism has long been in need of a redesign, lets be honest. For it to be hidden by gpus is a design oversight when it comes down to it. The sockets were designed when cards were thin AF . Also, why not put a smal piece of plastic or metal over those components to prevent this?
Nice job Graham
Graham, do you have a link to where you get your flux and the dispenser you use from? Also, would you be interested in diagnosing and repairing a similar mobo: the Asus ROG STRIX B550-F.
Flux Syringe Needles can be found on ebay, and they'll fit pretty much any flux that comes in a syringe. Something similar to this: www.ebay.co.uk/itm/134585975437
As for another mobo, if there's a known-fault I could take a swing at it - but I'm not good on diagnostics with ATX boards. This one was an easy win because of the visual damage.
@@Adamant_IT Well if you'd like to take a look at it, I'd be happy to send it down and pay for your time.
If I have that problem I use a cotton bud to push it, I'd never even think to use a screwdriver to risky
That will ruin your day. Did the same thing but missed vital components. Since i use a plastic pry tool
i like ur video thanks for this
How to reach out to you for repairs?
Fascinating, is a repair like this cost-effective on 'lesser' MB's?
Probably not. Decent AM4 mobos like this still go for £150+ though, so it was worth doing.
That being said, the cost is in Time, so while it might not be worth paying someone else's time to fix a mobo, your time is 'free' so to speak.
people need to start using a pencil eraser end.. hopefully new so sharp end dont poke your hand.
I would think it almost has to be pcie slot power, doesn't it?
hi iv got a motherboard i did something on the same line could u help please
When adding the parts back to the board, I think it's easier to use Mr. Solderfix's technique of leaving the pads flat and using a soldering iron to solder one end first. That way there is no risk of blowing the parts off the board, and you can fine tune the position of each part before soldering the other end. See ua-cam.com/video/irW5Whm0BVs/v-deo.html
I found my iron tips were just too big for doing this on 0402 and smaller, but I do have a new iron now, with a nice small J-tip, so I should try that again 👌
Mr. Solderfix makes it look so easy. It's never as simple when I try!@@Adamant_IT
Dear Adamant IT. I bought iMac 2019 and I didn't format it directly but after one year when I wanted to sell it, I formatted and it appeared that its firmware password is locked and the seller is not responding. Can you help me in opening it Please? I have a proof of legal purchase from Ebay. I am from UK
If YT paid us viewers to read the comments I would already be a millionaire ...
Man , your skills at soldering and heater using is awful.
Get a good quality tools bro
they need to redesign the damn gpu catch thing already. there absolkutely no reason in 2024 to have to be using a screwdriver to remove a gpu. They could simply make the catch an L shape so it comes out to the side of the average gpu
12:30, It's not impossible for that resistor to be a current sensing resistor (a circuit diagram would help loads), these can have values as low as 20 milliOhm. Your meter read 200 milliOhm. Might be time to get a better multimeter if you want to be sure about resistor values down at those sorts of readings...
EDIT : I see someone with the 'matic' says it is indeed a zero jumper. Still, a better multimeter never hurt anyone, lol
That's a good thought, but also current-sense / shunt resistors have a very distinctive look. The biggest giveaway is that the pads on them are on the long-sides, not the short sides.