I've just bought a cheap setup after watching your buying guide. I have so much I'm wanting to fix and not even bothered if I destroy a few in the process. Your videos are exceptional and explanations, working out problems are the best I've seen on RUclips. Thanks 👍
Nice one. Have fun and learn. Breaking a few things in the process is quite normal. Are you on LER discord? You will find a lot of help and schematics there. Learn Electronics Repair is now on Discord! Come and join the fun, it's free. discord.gg/vam6YC8vwU
I had the same issue on two Sapphire RX 470. PG was always low. I did the exact same diagnostics as you and also removed all the components that the PG was connected to. I replaced the NB671, 10K pullup resistor also the SOT-23 transistors connected to VDDCI etc but is still didn't work. Eventually I rotated R1017 90 degrees to the 3.3v to manually enable the VDDCI EN pin and it still works. I never found the root cause tho. Normal 3.3v power is around 214 ohms on that card. VDDCI is the left side circuit and VMEM is on top of VCORE. Great video as always. Keep them coming.
The missing screws tell me that it's probably a different board than what was sold. I always mark the board etc of any piece of tech I repair or sell, going all the way back to cb radios lol
That's possible though Luis and Albero (who brought me these cards to look at) did say they had tried to fix them. I'll text them and ask if they will post here to add to the debate what did and didn't happen to this card
@@LearnElectronicsRepair ahh so that's probably where the screws went 😂😂😂😂. Still weird that a working card suddenly doesn't work..... Maybe I'm getting jaded in my old age hahha
Good work with these dead gpu repair videos are quite entertaining and building my knowledge and mostly my confidence that I will one day be able to man up and fix my MSI gtx 1060 which bricked after cabling a mining riser to it
Great Video Richard , really educational. Signal Lines are way more complicated then just Power Lines and you make it easy to understand, thank you Richard !
Man I have a box of non working GPUs and motherboards…maybe I’ll be brave enough to try to diagnose and repair some these! Thank you Richard for another great video! I look forward to part 2
fantastic video! have to admit, even with an EE degree, I didn't know that's what the open-drain pin means, but it makes a lot of sense. Thanks for the explanation
Yeah there is always stuff to learn with electronics repair, I thought the open drain would confuse beginners but it seems it confuses more folk than that. Like you say it's simple, it's just that almost nobody bothers to explain it. 😉
As already said, you need to security mark the items to make sure the buyer has not swapped the item with a non working item, or at least record serial numbers, a lot of scammers on Ebay at present.
With selling on ebay, always note down the serial number and security mark the card with pen that only shows up under ultra violet lamp. That way you are at least 80%-90% sure it's the card you sold.
I guess you can look after your interests in this way. Still it's not totaly foolproof. It wouldn't stop someone taking the GPU BGA from your card, fitting their dead one and returning it. 😛
@@LearnElectronicsRepair yeah that's almost more effort than it's worth, although never doubt the will of scum out there to make a buck at others expense.
Usually, They kinda have an oily deposit around the RAM chips from the thermal pads. I don't think there is a definite rule here. Actually the owner told me this is an ex mining card.
This video is a god sent!! I have a sapphire nitro 570 with the same symthoms, what is butchered for sure(fuses replaced with THT ones on pci and aux, 1 cap knocked around memory and a scechy replaced coli). I only could find the apw8722a by my self, checked with the data sheet and if i remember correctly my consclusion was ,as well, the lack of enable signal to the chip, but I dont have a test bed, there fore i could not reach the pin easily in the case, so i might just missed the initial v sipike on the pin. Thank you for pointing out the NB671 I will try to make some measuring around it, I was about ot ask on the DC chanell if any1 knows where is it comming from.What noticed while i was booting the card, in ESXI the GPU got recognised in 1 state of the BIOS switch,but on in the other but might be just becouse some hacked mining bios on the other. This gives me hope about the repairability of the card, this video just broght back my enthusiasm. Thanks again!
Sh4rk Can I also suggest you join the LER Discord sever if you are not already on there? You will find a lot of friendly helpful guys there (plus the schematics) Learn Electronics Repair is now on Discord! Come and join the fun, it's free. discord.gg/vam6YC8vwU
@@LearnElectronicsRepair Many thanks for the invitation! :) Thanks to Tech Cementery I was invited some months ago, and lurking on papers an similar cases , i was just shy about posting before i rip the card appart and can measure again
@@TheDurdane Richard has some of the best content out there. Wish him all the best and that sometime soon he will get a new desk mat cause it’s not easy to look at.
Probably the buyer just switched his non working with the working one. I always mark things like this and also make pictures of serial numbers etc. Common problem even for big shops like amazon.
Which I suppose just proves some people are simply not very nice? If that is the case let's see if it had a major problem or is an easy fix condemning such behavior. In all honesty I couldn't actually find any evidence of foul play, maybe some proof of previous repair work, though I thought I might find something nasty (we all saw the video yeah?) I mean if you turn the light on one day and it doesn't come on you don't think it is weird, you just realize the light bulb has gone and go and buy a new one yeah??.
Exactly what I was thinking as well. Would not be the first time an ebay buyer scammed a video card out of someone. Use a UV pen to mark the card and take a photo of it before sending it out with the mark and serial # visible in the photo.
Hi, I've got the same card although mine had an issue with a short somewhere that keeps blowing the fuses on the PSU input, anyway I checked the resistance from PCIE 3.3 to ground and I get 210R and as far as I can tell that part of the card is OK.
hi great explanation, looking forward to part 2. I have issues with my own rx480 card, can you advise where you got the link for reference card schematic. thanks keep up the great work
Kevin Sigsworth The schematics used in my videos (and thousands more in fact) are available for free on LER Discord server. There is also a very active and friendly repair community on Discord to help you out with your own repairs. Here is the link. Learn Electronics Repair is now on Discord! Come and join the fun, it's free, and let's fix stuff together. 🙂 discord.gg/vam6YC8vwU
@@LearnElectronicsRepair This link (and the other above) directs me to discord, but when I click on the invitation button it says it is not allowed to invite...
I have 2 of these cards myself, one donor with a chipped gpu die and one with the exact same issue as this. Resistance on 3.3V to GND on the donor is about 3000 Ohms and the card with this same issue as yours is about 200 Ohms. Pgood on the donor card works and Vmem does turn on as a result. Like you I also suspected the NB761 cause everything else around it seemed fine so I swapped both chips around, made no difference. The chip I thought was faulty now worked on the donor card and vice versa, so the issue must lie somewhere else. Really looking forward to a part 2 on this one, if you need some other measurements to compare let me know.
It's a case in point sometimes it is worth getting the data sheet for the IC's at the end of the CCT and seeing if the voltages there make sense rather that trying to trace all through the board from the beginning to end when that can sometimes be almost impossible/a pain in the arse Another good methodical video but I would take issue with you trying to estimate expected currents. Once you have active devices on a board, guesstimating resistances and currents can lead to false dawns. The only resistance readings I trust on a board are very high ones and dead shorts ! Saw your video on repairing Peugeot key fob. I was told today current price £140 (170 Euros) in the UK for a new one coded. That sort of price though is not uncommon here - you want to start advertising your services a bit wider !
I've got a USB microscope and its useful for searching around on PCB's. It doesn't have a full screen imagine like we see on here but it is good enough compared to having to use your eyes or using a hand microscope.
I actually have a Trinocular optical microscope with a C Mount camera. I did have an Andonstar ADSM302 and that had HDMI output so I could view it full screen on my monitor if I wanted. Which one are you using (that doesn't give a full screen image)?
@@LearnElectronicsRepair Its a Veho Discovery VMS-004 Deluxe (1080p), I got it around 10 years ago for a birthday present but its actually come in very handy now. I can already imagine the tech and even the screen size of the more modern ones are better, I actually have a wireless one that was given to me that I need to repair, its got some sort of charging/battery problem which I think shouldn't be to hard to fix, especially as the problem is already made obvious!
Hello, where can I find the schematics for this RX 480? Can't seem to find this specific one. Hope you'll help out, thank you for your videos. I love em
I would be asking the owner if they sold it with the damage you observed and more importantly did it have missing screws, if it didn't have missing screws then the buyer is suspect 🤔
Hello Richard, got almost the same card RX 480 4 GB MSI with exactly the same problem and got the same diagnistic as here with less details but still replaced the chip with a donor card RX 480 AMD 8GB I got on hand. The chip on both are GS9238 and is equivalent I guess. After replacement the problem remains the same unfortunatly. Haven't got the time to dig deeper, so looking forward to see what will be your result :)
Las Palmas generally? Well in 2016 the majority of my own countrymen voted to remove my rights to freely live and work wherever I wanted in Europe. No one ever asked me if I valued those rights. I thought A: I have a nasty suspicion this is a very bad idea that is all going to turn to sh!t and B: why are you all so determined to trap me in my own country if that turns out to be the case? So while I had the chance I jumped ship. That's basically it really. Now I still have the choice. Las Palmas specifically? Well actually I'm in the South of Gran Canaria (Maspalomas) rather than the capital Las Palmas and basically that's it was the nearest place that has tourism all year round, no high/low season, and good infrastructure - so therefore there are opportunities for work all year round.
@@LearnElectronicsRepair I completely agree with you!. My case is the opposite: I was born in Las Palmas, but lived all my life in Tenerife. I emigrated in 1998. You are lucky you don't have to live under a xenophobe and stupid government. Anyway keep on with your videos.
@@LearnElectronicsRepair Jeje, true, true. Sadly for me I am not a master and I am just trying to find possible solution. Will continue digging on that. Thanks
@@overnxted Actually what I meant to say is 'it's all just eletronics' as in no specialized experience is required to fix things. You could send it to me and I will see if I can repair it, no fix no fee, electronicanaria@outlook.com Or ask on LER discord server and see if someone can help you there 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
I tell others who plan to be an ebay Seller, or just Sell something on Ebay to do the following . Document Everything about the Item youre selling . Pictures Pictures Pictures of Everything about the item . Serial Numbers, scratches, dings, dents etc, you take photos and make sure you have those pictures Time/Date Stamped . Ive been on Ebay for a long time selling, Computers and GPU's mostly . I even go so far as to Mark the items . I have one of those tools to Scribe so i can put a Mark somewhere hidden on the Item . Gpus ill take the Plate off that surrounds the ports on the rear and put in a serial # or a "Mark" and Document it . GPU Scams are Rife online, buying a card and returning a broken one . So do your due diligence and Document everything you can . It will save you a lot of grief and Money . Cheers .
What about part 2, i think that when I have measured power good I have shorted it with V out (on the c918 solder point that is connected to V out), I m not sure if previously I had 5v on power good but now I have only 0.6v, and no image, gpu still warm, I came here for glitches and ended in non functional card which gets detected in windows but no video output, this is at min 50:14 of the video, now I have 0.9v pex on the right side and 0.87 on the left side
You mention all the items on the Discord. I must be using it wrong. I have looked all around it and cannot find fz files or board view or schematics for any of the boards I am trying to learn on. I purchased 6 broken amd 7950 and 7850 boards and cannot find anything for them. Am I missing something on how to search? I have asked questions and 1 or 2 have been addressed there. Thanks
I have no idea if the pcb annotations are the same on this card as the schematic i have in hand now, but i’d suggest to take out u200 (SN74LVC1G123DCT) this is responsible for fan control and some other communication between like perstb buf px en etc. it’s marked with a c23 and has a gray line for orientation. I found 2 shorted until now on 2 different cards, and the 3v3 line was almost shorted to ground (10-20ohms). Once replaced i had correct voltages… of course this didn’t was the end of the repair, as bot cards were a nightmare… good luck!
Thank you Justin C. I'll look at that after the weekend. Which schematic are you referring to? The Sapphire RX480 has completely different PEX and MVDD buck controllers than the ones in the three schematics that I have (the ones on LER Discord) so I don't know how similar it is regards fan controller.
@@LearnElectronicsRepair you are welcome! U200 is the same on sapphire, and the ic itself is the same on all 4xx and 5xx. I saw in your video is marked u200 also :)
Anyone know how does the external PCIe slot power work? like it's directly powered from the motherboard or other source? if it's from the motherboard is the external PCIe slot function is it for easy measurement of voltage while it's on? if its not powered from the motherboard, is the fuction to prevent a shock circuit? how does it work?
Are subscribers able to send in graphics cards to try and fix and send back? Have a 980Ti from eBay that was wrongly described, does do anything but I'm not going to attempt the oven method. Fine with paying a fee for the try :)
Hi! I got in repair rx480 4gb armor, got all voltajes, 0.9vcore. 1.5vram. 3.3v memory. 1.8v. Y got pin1 memory for 0.1seconds comunication. In pin6 memory got 0.1seconds comunication but it dispear. Cristal of clock in micro ok and funcional. Gpu is warming a little... Fan coolers in some ocations go to 80% 100%. Bios is flashed whit correct firmware. Im maked a reflow whit same results.
I've just bought a cheap setup after watching your buying guide. I have so much I'm wanting to fix and not even bothered if I destroy a few in the process. Your videos are exceptional and explanations, working out problems are the best I've seen on RUclips. Thanks 👍
Nice one. Have fun and learn. Breaking a few things in the process is quite normal. Are you on LER discord? You will find a lot of help and schematics there.
Learn Electronics Repair is now on Discord! Come and join the fun, it's free.
discord.gg/vam6YC8vwU
I had the same issue on two Sapphire RX 470. PG was always low. I did the exact same diagnostics as you and also removed all the components that the PG was connected to. I replaced the NB671, 10K pullup resistor also the SOT-23 transistors connected to VDDCI etc but is still didn't work. Eventually I rotated R1017 90 degrees to the 3.3v to manually enable the VDDCI EN pin and it still works. I never found the root cause tho. Normal 3.3v power is around 214 ohms on that card. VDDCI is the left side circuit and VMEM is on top of VCORE. Great video as always. Keep them coming.
Can confirm - on my RX480 from sapphire there is around 220 ohms on 3.3V line.
@@MrMCMLXXV Thanks for the info
The reason I love these videos is that you have determination, patience and a great way of explaining things. Thank you !
Thank YOU i AGREEE IT REALLLY SEEMS it has Been swapped to Make it seem that the its the SAME unit that has been returned NO WAY its THE Sane Unit
The missing screws tell me that it's probably a different board than what was sold.
I always mark the board etc of any piece of tech I repair or sell, going all the way back to cb radios lol
That's possible though Luis and Albero (who brought me these cards to look at) did say they had tried to fix them. I'll text them and ask if they will post here to add to the debate what did and didn't happen to this card
@@LearnElectronicsRepair ahh so that's probably where the screws went 😂😂😂😂.
Still weird that a working card suddenly doesn't work.....
Maybe I'm getting jaded in my old age hahha
@@cheeky50862 No, really I think the buyer swapped it - I just can't find any overt proof of that 😉
@@LearnElectronicsRepair that's my guess tbh they've swapped it over
You are doing a great work with these videos mate. Thank you for sharing the knowledge! Cheers!
I'm doing my best to. 😀
Good work with these dead gpu repair videos are quite entertaining and building my knowledge and mostly my confidence that I will one day be able to man up and fix my MSI gtx 1060 which bricked after cabling a mining riser to it
Great Video Richard , really educational. Signal Lines are way more complicated then just Power Lines and you make it easy to understand, thank you Richard !
I really enjoy and appreciate the depth of detail you go thur explaining . Northridge fix and sorin do not explain like you.
Much love and respect.
Man I have a box of non working GPUs and motherboards…maybe I’ll be brave enough to try to diagnose and repair some these! Thank you Richard for another great video! I look forward to part 2
Heya can't wait for part 2
i wanna see part 2 too....if is posible..................
I really liked your explanation around 35:15, about "power good".
You earned yourself a new subscriber. 🙂
Thank you 😉
Great explanation of feedback an Vref... There is always much to learn from you. Keep up the good work!
Cheers 🙂
fantastic video! have to admit, even with an EE degree, I didn't know that's what the open-drain pin means, but it makes a lot of sense. Thanks for the explanation
Yeah there is always stuff to learn with electronics repair, I thought the open drain would confuse beginners but it seems it confuses more folk than that. Like you say it's simple, it's just that almost nobody bothers to explain it. 😉
As already said, you need to security mark the items to make sure the buyer has not swapped the item with a non working item, or at least record serial numbers, a lot of scammers on Ebay at present.
Yeah 1s selling dead cards as working
Great video. I was hoping for closure where you replace the chip and it works.
With selling on ebay, always note down the serial number and security mark the card with pen that only shows up under ultra violet lamp. That way you are at least 80%-90% sure it's the card you sold.
I guess you can look after your interests in this way. Still it's not totaly foolproof. It wouldn't stop someone taking the GPU BGA from your card, fitting their dead one and returning it. 😛
@@LearnElectronicsRepair yeah that's almost more effort than it's worth, although never doubt the will of scum out there to make a buck at others expense.
Excellent as always!
Thank You 🙂
Great videos, keep em' coming. Can you please explain how do you recognize a mining GPU just from lookin at it?
Usually, They kinda have an oily deposit around the RAM chips from the thermal pads. I don't think there is a definite rule here. Actually the owner told me this is an ex mining card.
iv got a nasty feeling that the board that got sent back is not the same board i think he has been scammed
We mark everything we sell on EBAY with UV pen in the hard to clean places and on the removeable parts, then we know if its our or not!
This video is a god sent!! I have a sapphire nitro 570 with the same symthoms, what is butchered for sure(fuses replaced with THT ones on pci and aux, 1 cap knocked around memory and a scechy replaced coli). I only could find the apw8722a by my self, checked with the data sheet and if i remember correctly my consclusion was ,as well, the lack of enable signal to the chip, but I dont have a test bed, there fore i could not reach the pin easily in the case, so i might just missed the initial v sipike on the pin. Thank you for pointing out the NB671 I will try to make some measuring around it, I was about ot ask on the DC chanell if any1 knows where is it comming from.What noticed while i was booting the card, in ESXI the GPU got recognised in 1 state of the BIOS switch,but on in the other but might be just becouse some hacked mining bios on the other. This gives me hope about the repairability of the card, this video just broght back my enthusiasm. Thanks again!
Sh4rk
Can I also suggest you join the LER Discord sever if you are not already on there? You will find a lot of friendly helpful guys there (plus the schematics)
Learn Electronics Repair is now on Discord! Come and join the fun, it's free.
discord.gg/vam6YC8vwU
@@LearnElectronicsRepair Many thanks for the invitation! :) Thanks to Tech Cementery I was invited some months ago, and lurking on papers an similar cases , i was just shy about posting before i rip the card appart and can measure again
Any updates on part 2? This one is interesting.
Thats my question too... 😁
@@TheDurdane Richard has some of the best content out there. Wish him all the best and that sometime soon he will get a new desk mat cause it’s not easy to look at.
Probably the buyer just switched his non working with the working one. I always mark things like this and also make pictures of serial numbers etc. Common problem even for big shops like amazon.
Which I suppose just proves some people are simply not very nice? If that is the case let's see if it had a major problem or is an easy fix condemning such behavior.
In all honesty I couldn't actually find any evidence of foul play, maybe some proof of previous repair work, though I thought I might find something nasty (we all saw the video yeah?) I mean if you turn the light on one day and it doesn't come on you don't think it is weird, you just realize the light bulb has gone and go and buy a new one yeah??.
Exactly what I was thinking as well. Would not be the first time an ebay buyer scammed a video card out of someone. Use a UV pen to mark the card and take a photo of it before sending it out with the mark and serial # visible in the photo.
nice video...great analisis....tell me if is posible change a GS9238 for a GS9230 chip on pex rail.....thanks
Hi, I've got the same card although mine had an issue with a short somewhere that keeps blowing the fuses on the PSU input, anyway I checked the resistance from PCIE 3.3 to ground and I get 210R and as far as I can tell that part of the card is OK.
hi great explanation, looking forward to part 2. I have issues with my own rx480 card, can you advise where you got the link for reference card schematic. thanks keep up the great work
Kevin Sigsworth
The schematics used in my videos (and thousands more in fact) are available for free on LER Discord server. There is also a very active and friendly repair community on Discord to help you out with your own repairs. Here is the link.
Learn Electronics Repair is now on Discord! Come and join the fun, it's free, and let's fix stuff together. 🙂
discord.gg/vam6YC8vwU
@@LearnElectronicsRepair This link (and the other above) directs me to discord, but when I click on the invitation button it says it is not allowed to invite...
I have 2 of these cards myself, one donor with a chipped gpu die and one with the exact same issue as this. Resistance on 3.3V to GND on the donor is about 3000 Ohms and the card with this same issue as yours is about 200 Ohms. Pgood on the donor card works and Vmem does turn on as a result.
Like you I also suspected the NB761 cause everything else around it seemed fine so I swapped both chips around, made no difference. The chip I thought was faulty now worked on the donor card and vice versa, so the issue must lie somewhere else. Really looking forward to a part 2 on this one, if you need some other measurements to compare let me know.
It's a case in point sometimes it is worth getting the data sheet for the IC's at the end of the CCT and seeing if the voltages there make sense rather that trying to trace all through the board from the beginning to end when that can sometimes be almost impossible/a pain in the arse
Another good methodical video but I would take issue with you trying to estimate expected currents. Once you have active devices on a board, guesstimating resistances and currents can lead to false dawns. The only resistance readings I trust on a board are very high ones and dead shorts !
Saw your video on repairing Peugeot key fob. I was told today current price £140 (170 Euros) in the UK for a new one coded. That sort of price though is not uncommon here - you want to start advertising your services a bit wider !
I've got a USB microscope and its useful for searching around on PCB's. It doesn't have a full screen imagine like we see on here but it is good enough compared to having to use your eyes or using a hand microscope.
I actually have a Trinocular optical microscope with a C Mount camera. I did have an Andonstar ADSM302 and that had HDMI output so I could view it full screen on my monitor if I wanted. Which one are you using (that doesn't give a full screen image)?
@@LearnElectronicsRepair Its a Veho Discovery VMS-004 Deluxe (1080p), I got it around 10 years ago for a birthday present but its actually come in very handy now.
I can already imagine the tech and even the screen size of the more modern ones are better, I actually have a wireless one that was given to me that I need to repair, its got some sort of charging/battery problem which I think shouldn't be to hard to fix, especially as the problem is already made obvious!
at 3.3v I have a resistance of 200ohm, if I change the dipsticks on the gnd it is also 213 ohm
same graphics card
goodbye Matej
Was it the sme one sold as the same one they got back?
Hello, where can I find the schematics for this RX 480? Can't seem to find this specific one. Hope you'll help out, thank you for your videos. I love em
this is the issue am having with my xfx rx 480.
I solved it by the way it was a bad ram module reflowed it and the gpu has been working for more than 3 weeks.
I would be asking the owner if they sold it with the damage you observed and more importantly did it have missing screws, if it didn't have missing screws then the buyer is suspect 🤔
Hello Richard, got almost the same card RX 480 4 GB MSI with exactly the same problem and got the same diagnistic as here with less details but still replaced the chip with a donor card RX 480 AMD 8GB I got on hand. The chip on both are GS9238 and is equivalent I guess. After replacement the problem remains the same unfortunatly. Haven't got the time to dig deeper, so looking forward to see what will be your result :)
This one has NB671 chip driving PEX and APW8722A driving MVDD. Not GS9328.
I love your videos mate!. Is great how you expand on some of the theory. BTW, how comes you are in Las Palmas?
Las Palmas generally? Well in 2016 the majority of my own countrymen voted to remove my rights to freely live and work wherever I wanted in Europe. No one ever asked me if I valued those rights.
I thought A: I have a nasty suspicion this is a very bad idea that is all going to turn to sh!t and B: why are you all so determined to trap me in my own country if that turns out to be the case? So while I had the chance I jumped ship. That's basically it really. Now I still have the choice.
Las Palmas specifically? Well actually I'm in the South of Gran Canaria (Maspalomas) rather than the capital Las Palmas and basically that's it was the nearest place that has tourism all year round, no high/low season, and good infrastructure - so therefore there are opportunities for work all year round.
@@LearnElectronicsRepair I completely agree with you!. My case is the opposite: I was born in Las Palmas, but lived all my life in Tenerife. I emigrated in 1998. You are lucky you don't have to live under a xenophobe and stupid government. Anyway keep on with your videos.
Hello, excellent videos, apologies for next question, do you have any experience with Dell laptops and charger not recognized?
Not specifically - but at the end of the day it's all just electronics yeah?
@@LearnElectronicsRepair Jeje, true, true. Sadly for me I am not a master and I am just trying to find possible solution. Will continue digging on that. Thanks
@@overnxted Actually what I meant to say is 'it's all just eletronics' as in no specialized experience is required to fix things. You could send it to me and I will see if I can repair it, no fix no fee, electronicanaria@outlook.com
Or ask on LER discord server and see if someone can help you there
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
did the seller check the S/N to make sure its the same card?
I tell others who plan to be an ebay Seller, or just Sell something on Ebay to do the following . Document Everything about the Item youre selling . Pictures Pictures Pictures of Everything about the item . Serial Numbers, scratches, dings, dents etc, you take photos and make sure you have those pictures Time/Date Stamped . Ive been on Ebay for a long time selling, Computers and GPU's mostly . I even go so far as to Mark the items . I have one of those tools to Scribe so i can put a Mark somewhere hidden on the Item . Gpus ill take the Plate off that surrounds the ports on the rear and put in a serial # or a "Mark" and Document it . GPU Scams are Rife online, buying a card and returning a broken one . So do your due diligence and Document everything you can . It will save you a lot of grief and Money . Cheers .
Lift the PG pin on the NB671 and apply an external PG voltage to the pad. Then if the rest works you have proven this fault.
How do you lift the pin on a QFNL chip?
@@LearnElectronicsRepair good point. Cut the trace?
Solder epoxy wire
What about part 2, i think that when I have measured power good I have shorted it with V out (on the c918 solder point that is connected to V out), I m not sure if previously I had 5v on power good but now I have only 0.6v, and no image, gpu still warm, I came here for glitches and ended in non functional card which gets detected in windows but no video output, this is at min 50:14 of the video, now I have 0.9v pex on the right side and 0.87 on the left side
You mention all the items on the Discord. I must be using it wrong. I have looked all around it and cannot find fz files or board view or schematics for any of the boards I am trying to learn on. I purchased 6 broken amd 7950 and 7850 boards and cannot find anything for them. Am I missing something on how to search? I have asked questions and 1 or 2 have been addressed there. Thanks
I have no idea if the pcb annotations are the same on this card as the schematic i have in hand now, but i’d suggest to take out u200 (SN74LVC1G123DCT) this is responsible for fan control and some other communication between like perstb buf px en etc. it’s marked with a c23 and has a gray line for orientation. I found 2 shorted until now on 2 different cards, and the 3v3 line was almost shorted to ground (10-20ohms). Once replaced i had correct voltages… of course this didn’t was the end of the repair, as bot cards were a nightmare… good luck!
Thank you Justin C. I'll look at that after the weekend. Which schematic are you referring to? The Sapphire RX480 has completely different PEX and MVDD buck controllers than the ones in the three schematics that I have (the ones on LER Discord) so I don't know how similar it is regards fan controller.
@@LearnElectronicsRepair you are welcome! U200 is the same on sapphire, and the ic itself is the same on all 4xx and 5xx. I saw in your video is marked u200 also :)
Anyone know how does the external PCIe slot power work? like it's directly powered from the motherboard or other source?
if it's from the motherboard is the external PCIe slot function is it for easy measurement of voltage while it's on?
if its not powered from the motherboard, is the fuction to prevent a shock circuit? how does it work?
could it be a flashed bios attempt gone bad maybe?
Are subscribers able to send in graphics cards to try and fix and send back?
Have a 980Ti from eBay that was wrongly described, does do anything but I'm not going to attempt the oven method.
Fine with paying a fee for the try :)
Puggly Bear. email me electronicanaria@outlook.com for the details. Basically it is no fix no fee, and fixed price repair in most cases.
@@LearnElectronicsRepair I sent a email cheers :)
Hi! I got in repair rx480 4gb armor, got all voltajes, 0.9vcore. 1.5vram. 3.3v memory. 1.8v.
Y got pin1 memory for 0.1seconds comunication.
In pin6 memory got 0.1seconds comunication but it dispear.
Cristal of clock in micro ok and funcional.
Gpu is warming a little... Fan coolers in some ocations go to 80% 100%.
Bios is flashed whit correct firmware.
Im maked a reflow whit same results.
possibly memory corruption
Part 2 ???
How you can test a relay in circuit ? Or its switching.
Put enough voltage across the coil to switch the contacts, then test if you have continuity on the closed contacts?
Thanks
im totaly nobish , but i smell gpu is faulty to low resistance on 3,3v & vddc (need to be >40 ohm)
Yeah that is one possibility but there is something else that I want to try regards that low resistance - Pt 2 coming soon
Most times the ebay gpus are sold dead by deceivers as working
At 57:00, R325 seems to have a solder bridge across it.
Thanks I'll take a look
Very amazing nock off