Trying to fix a dead RX 580 - Page 1
Forum section: electronics / repair

author: Darximor
author_rank: Contributor
timestamp: January 27, 2019, 12:01:08 pm
content: Hello all,I'm new to electronics stuff, I learnt a lot during the last few weeks about repairing dead GPU and motherboard. I own a dead RX 580, I tested some stuff and the two fuse from the 8 pins alimentation seems to not work properly, If I set the multimeter like this, I get the result of the joined imageBut an another working fuse of 10A gave me about 00.3 (and a beeping sound)Do you think that replacing the two fuses with :https://www.ebay.fr/itm/FUSE-10A-Nano-125v-LF10A-V-Fast-acting-Nano-Littlefuse-0451010-NRL-6-1mmx2-69mm/291509798064?hash=item43df5684b0:g:JK8AAOSwo4pYGxWv:rk:2:pf:0may fix this problem ?Do you think that other parts may be damaged beacause of this ?Sorry for my bad english, I'm frenchThanks !

author: fzabkar
author_rank: Super Contributor
timestamp: January 27, 2019, 08:01:44 pm
content: I suspect that other parts will have been damaged. In any case you should test for short circuits before replacing the fuses. Can you provide the part markings on the ICs?

author: cdev
author_rank: Super Contributor
timestamp: January 27, 2019, 08:08:34 pm
content: Are you the original owner of the card? If so, what symptoms did it exhibit before it went totally non-functional?

author: Rasz
author_rank: Super Contributor
timestamp: January 27, 2019, 10:27:55 pm
content: similar case to give you an idea how difficult it might be to find the fault

author: cdev
author_rank: Super Contributor
timestamp: January 27, 2019, 10:41:08 pm
content: See how useful it is to power it with external power supply set to have a low current limit, and then be able to see exactly what parts are slightly warmer?No expensive thermal camera needed, I can do exactly the same thing with mycheap LC plastic sheet, I don't need a $500 thermal imager.It's helped me fixso muchbroken stuff. Just place the sheet on the PCB and it shows exactly whats gotten warm.

author: Darximor
author_rank: Contributor
timestamp: January 30, 2019, 09:45:58 am
content: Thanks all for your responsesYes I must search for a shortcut, but what do you mean n'y ICs ? Is it the BGA chips ?Yes I was the owner, while gaming the screen goes black, then I have never been able to output things from it (just fans are spinning and logo is on)Thanks for the vidéo, I found this one also :https://youtu.be/9iiEbmLcNzgSo I must also search for warm area after trying to power on ?Do you think that if I short the two fuses and test the cart, I will be able to know if anything else is dead pretty safely ?

author: cdev
author_rank: Super Contributor
timestamp: January 30, 2019, 01:59:06 pm
content: Do you have a current limiting power supply? Use a value so low not only the fuses can't blow but also no additional damage could be done. And look for very small temp changes.

author: SilverSolder
author_rank: Super Contributor
timestamp: January 30, 2019, 04:27:09 pm
content: Quote from: cdev on January 27, 2019, 10:41:08 pmThat's an interesting idea. How do you use the sheet - have you cut some pieces of it to place flat on individual components?

author: cdev
author_rank: Super Contributor
timestamp: January 30, 2019, 11:20:53 pm
content: Thats exactly what I do, its not conductive, so I just have the PCB horizontal and put them on top of it and immediately you can see the hot spots, if there are any. Its very sensitive.They are just plastic, the best ones I have are square and approximately 15x15 cm. Thats big enough for most PCBs I need to do it on. You can move it while you're using it, the color changes in real time, almost instantly.I have accumulated a bunch of them from different sources. The ones I use the most are sensitive between 20-25 degrees C

author: Darximor
author_rank: Contributor
timestamp: February 04, 2019, 11:10:57 am
content: So I could not find any limiting power supply for sale (except online but it would be difficult). Maybe I can just try starting it and search for hot area on the PCB ? If I understand, that would be where the problem is

author: cdev
author_rank: Super Contributor
timestamp: February 04, 2019, 01:29:16 pm
content: Limit the current with a non current limited power supply with a big resistor then. You can't apply full power and have this work. It will likely just blow your fuses and remain cold, or do more damage.Invest in a current limited supply. You really do need it to do this.

author: Rasz
author_rank: Super Contributor
timestamp: February 04, 2019, 05:14:31 pm
content: Quote from: Darximor on February 04, 2019, 11:10:57 amnot understanding something this basic means you wont be able to repair it, just send the card to CORE, they usually charge pretty fairhttps://www.youtube.com/user/1servicecore/about?disable_polymer=1

author: JFerris321
author_rank: Contributor
timestamp: February 04, 2019, 07:50:26 pm
content: Check the main PSU on your PC, i have seen these fuses blow when the power supply starts to fail in some machines. You can get lucky and it just be the fuses but i would not bypass them, i would relace them if you want to test it.

author: cdev
author_rank: Super Contributor
timestamp: February 04, 2019, 08:53:39 pm
content: The problem with graphics cards is they take a very high current, so an adjustable voltage and current limited power supply large enough to actually power it at its rated current is likely to be expensive. I don't know much about the specific art of fixing graphics cards, but a few days ago, in another thread about an Nvidia card, there was somebody else asking about a similar problem and one of the people who responsed linked to a video, in Russian showing the use of a thermal imager in the graphics card repair process. So, find that, watch that. Thats what I am talking about, its just the same without the high cost for the thermal imager, but you will still need a power supply. Its likely you can use a much lower current limited PS (even one of the really cheap ones based on a DC-DC converter) to see something very simple like a direct short in some obvious place.. But thats where my knowledge ofgraphics card repairends. I take very good care of my graphics card, I do not use it for anything thats super stressful on it, so hopefully it will never blow up like that.Quote from: Darximor on February 04, 2019, 11:10:57 am