GTX 1070 Does Not Start / Not Detected By PC - Can We Fix It?

This GTX 1070 had a rather unusual fault, at least to me. It's the first time I saw this sort of problem with a GPU. Watch along and you may learn something here, as I did,
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Thank you
Richard

[@axellno1759]

I enjoy your videos even if "we" can't get a fix it's very entertaining how you always manage to find the fault.

[@LearnElectronicsRepair]

Thanks AxelL No1 Yeah this one is as good as fixed now, just needs a new RAM chip most likely. The path is often just as interesting as the destination, and it does make for good education videos 🙂

[@davidhollfelder9940]

Richard, you’re amazing .. I’d never even try to fix an SMT card. This is a fantastic learning experience on the mining adapter, PCIe and the overall layout/components/power/voltages of makes up these cards.

[@Maine307]

i am a new veiwer and subscriber.. I been watching your videos..for about 2 weeks now.. binge watching and doing my best to catch up. I want to say, that this is an amazing channel! You are extremly easy to listen to. I feel like i can build my own robo! your awesome! keep it up! Cheers from Maine USA - if there is anything i can send you, let me know.. we have one of the last original Radio Shack stores near me.. I loved that 200 & 1 learning machine kids used to have..learned a lot of cuircuts stuff. cheers and many thanx for your channel!

[@mosfettg6857]

Great job Richard , sussing the 1.8,and as a learner I would not have thought a broken down 0hms resistor would gain resistance and cause a drop of two volts.

[@wherami]

absolutely fascinating how far you go with this.

[@Silverlion49]

Small suggestion - Get an adjustable pcb board holder - frees up your hands/fingers and it will provide stability and locks board in one position when soldering, making measurements, etc. Circuit boards that are awkward to position can lead to bad measurements, accidentally shorting components, poor soldering, (burnt fingers, cold joints,etc.)

[@LearnElectronicsRepair]

That's a very good idea - I only have this problem when I have things like a GPU that will not site flat upside down but I'll find something

[@Electricworld-1]

Hello my dear rich, firstly I would like to thank you for all your hard work and massive knowledge and your clarity in your Explanations. I have to say you are the best on the KZbin and I love you very much for sharing and teachings. Please keep up the outstanding teachings thank you so very much Sir.

[@Jason-zh7wo]

Nice job fault finding, thanks for showing 👍👍

[@techmatebolpur9252]

grand pa became younger after reading data lines in diode mode , how awesome is this ❤❤❤❤ 24:45

[@LearnElectronicsRepair]

Oh yeah I get rejuvenated about once every 8 weeks, it must be something to do with the climate 😄

[@techmatebolpur9252]

@@LearnElectronicsRepair 😎 great , watched completely and gathered a lots of info , thanks for this awesome video ❤❤❤

[@FxkDGM]

I like the way you went about tracing back the voltages down to the 1.8V rail in order to diagnose the problem. The way of processing it is very interesting, and boardviewer circuit diagrams definitely help a lot as well.

[@LearnElectronicsRepair]

Thank You 🙂 I mentioned the fault finding process in passing on the video but for those not so familiar: The tracing of the fault back to the 1.8V came from having some understanding of the power on sequence for Nvidea graphics cards 12V and 3.3V -->>5V ->>1.8V ->>PEX (0.9V-1.0V) ->>Vram (1.5V/1.35V) ->>Vcore ~0.8V So basically I figured out that the first voltage rail in the sequence that was unstable (in this case 1.8V) was probably messing up all the following ones. Regards the boardviews, the one I used in this video was not the correct one for this graphics card but it was close enough. You can download board views and schematics for free on LER discord. 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

[@FxkDGM]

@@LearnElectronicsRepair cheers LER already a member of the discord server for quite some time and love the place it's great, being surrounded with people who have similar interests / hobbies as you! As well as a great bit of knowledge and experience.

[@andymouse]

Thats the way the cookie crumbles but you found the fault !...cheers.

[@maksberlec4832]

Richard, a number of the RAM chip is D9TCB, so you have a lot of them.

[@marcellipovsky8222]

Hi Richard, if I may a suggestion - get some good overhead lights. It makes a huge difference while looking at the boards under the microscope. And also we will see you better when there is much light in the background (window) ⬅

[@LearnElectronicsRepair]

Hmm I have two 58W flourescent tubes suspended on a beam 1m above the workbench. I also have three more florescent tubes (smaller ones) in the ceiling just behind me. I can't do much about the shop window right now but I'll be getting some vertical or roller blinds for it soon as I have another project planned.

[@marcellipovsky8222]

@@LearnElectronicsRepair see yet another way to create some content 😀thumbs up for that. When you use the flashlight on the PCB under the microscopbe, the image is so much better.

[@anthonydenn4345]

This looks to be your part number Richard. MT51J256M32HF-80:A 2000MHz D9TCB. Seems like there is a B version also!

[@LearnElectronicsRepair]

Cheers

[@theshemullet]

Thanks! Can you explain vcore, vram etc in an upcoming vid

[@LearnElectronicsRepair]

Hi Adam. Thank you for the Super Thanks donation. It is much appreciated, I may have already covered the info you are looking for regarding Vram and Vcore in an earlier video - try this one, and then let me know kzbin.info/www/bejne/iZ65lZ9uoMqqlZY

[@PaulaXism]

D9TCB is your part number... BUT.. it comes in 1.35 and 1.5 variants and Micron seem vague on their datasheets.

[@LearnElectronicsRepair]

Thanks for the info. It seems like this graphics card also sent 1.35V or 1.5V to the ram in a rather vague manner 😅

[@ThylUlenspiegel101]

I am wondering if you could have located the faulty 0 Ohm resistor using the thermal camera you showed the other day.😀

[@LearnElectronicsRepair]

Well, this is quite easy to work out. So the resistor was reading 228 ohms and the voltage dropped across it was about 2 volts (12V - 10V). Obviously it was acting somewhat intermittent and the actual ohms value was changing as the voltage coming out of it was also changing. But anyway we can do a rough calculation using ohms law. So first we need to know the current passing through the resistor, I=V/R so 2/228 = 0.008A or 8mA. Hmmm then the wattage is going to be very low... W=VxI so 2Vx.008A = 0.016W or 16mW. I did get the thermal camera to show up heat traces at a dissipation of about 15mW but given there is a fairly heavy power plane in this area of the PCB my best guess answer would be *no, I probably couldn't have located it with the thermal camera*

[@wherami]

you only have to do the ./ if the interpreter does not have the executable in the PATH variable or if the the executable or script dont have the executable bit set in linux. you also have to be in the correct directory if you use the ./

[@SamDuneman]

The top number is the date code. Bottom number is the memory type on Micron memory Your scrap 1070 that's missing the core is the same memory, D9TCB

[@weerobot]

That GPU got mind of it's Own..lol

[@theshemullet]

@25:25 your saying it can't be a missing capacitor. Is that because a capacitor would smooth out the voltage. If one was missing you might get a fluctuating signal?

[@LearnElectronicsRepair]

I was kinda intimating that it couldn't be a missing capacitor as I had several different voltage rails what were unstable, and they each have their own capacitors. I can accept if one rail unstable was causing all the others to be unstable as well, then it could be a missing/bad capacitor on the first rail

[@theshemullet]

12:56 so if your only using x1 on the mining adapter. why not use the x1 slot instead of the x16. just wondering

[@LearnElectronicsRepair]

No reason really - I just put the card in slot 1 (PCie) 16x as a matter of convention and it gives me a reason to remind viewers, from time to time, about the perils of inserting mining adapters the wrong way round 😉

[@mixerD1-]

I'm in Maspalomas on hols now... I'll be going to visit if I can find ya...if I can't, just saying I'm seriously f***in jealous of ya!!😁😁

[@LearnElectronicsRepair]

Yeah I'm based in Maspalomas (San Fernando to be exact) You are welcome to come and see me 🙂 email me [e-mail] How long are you here for? I may even buy you a beer ⛱🥃

[@mixerD1-]

@@LearnElectronicsRepair Here til Thursday... just heading to the beach now... might drop by on Tuesday.

[@trevorflynn1520]

I like your videos great learning thankyou..

[@GOKUBLACK-sk4ux]

i just bought the gtx 1070 katana but for some reason my pc not detecting the graphics card. the graphics card uses 6 pins with extra 2 (6+2). if i plug in the the six pins it tells me to please power down and connect pcie power cables for this graphics card. and when do connect the extra it displays nothing. the pc don’t even detect the graphics. can someone please advice or give me a solution ? thanks

[@gndworkshop]

if i not miss understand the pcb boardview and schematic, the phase 1 , got 2 mosfet and 2 drivers selected by the u504 , its like a logic gate..i think its a phase 1 backup system. can confirm this? thx

[@LearnElectronicsRepair]

Ahh that is interesting, Also some GPU when idling (before the drivers load) run Vcore with just one phase. I wonder if it is related to that?

[@gndworkshop]

@@LearnElectronicsRepair i really dont know that. Im nota engineer but if you track the enables of the drivers you reach the u504. And i really dont understand how It work. Maybe you with your knowledge can show us the path !! Hehehe thanks for reply

[@Dutch_off_grid_homesteading]

Heya wel if you can't get the chip then that maybe the end of the road

[@theshemullet]

./ just tells the Linux system to run the command from the directory you in, rather than trying to use a binary in path

[@LearnElectronicsRepair]

That is true but there is something wierd about my linux hard drive - I didn't set it up, it's the 'kings overkill' one. So if I miss out the ./ then the first instance of mods in 'the path' would always be the one that ran yes? But: If I cd to a directory 4xx.xx.x and run mods without the ./ then the version that runs by default is the one that requires the -oqa argument, which is correct behaviour for mods v4xx. If I cd to a directory 3xx.xx.x and run mods without the ./ then the version that runs by default is the one that requires the -mfg argument, which is correct behaviour for mods v3xx.. I know that is the case as if you put the wrong argument for either version of mods it tells you so. What no one managed to explain yet is how it knows which version to run by default if I miss off the ./

[@theshemullet]

@@LearnElectronicsRepair have you checked that there isn't a copy of mods in each of the directories that has been modified to run the correct parameters for that test

[@LearnElectronicsRepair]

@@theshemullet I'm sure that is what I do have as if I type ./mods it also works. But according to my understanding if I type mods without the ./ it should always run the same version, the first one in the path file, and that is not what happens.

[@theshemullet]

@@LearnElectronicsRepair it must be something like that. Although it wouldn't be difficult to customize Linux to chose local file over path based. It may have been made like this to make it easier to understand for users coming from windows command line

[@HoracioGonzalezLarrain]

'which mods' will tell you the location of the binary that gets executed when you're not using './'

[@alikut99]

How to find diagrams for gpu

[@LearnElectronicsRepair]

Go to LER discord - there are many of them on there and they are all free

[@3D_Printing]

WINDOWS 11 UPDATE CAUSE ISSUES

[@theshemullet]

Thanks! Can you explain vcore, vram etc in an upcoming vid