Learn Electronics Repair #142 THE GPU REPAIR GUIDE - Divided into chapters, English Language 0:00:00 CHAPTER 1 - INTRO 0:01:56 CHAPTER 2 - ESSENTIAL TEST EQUIPMENT AND TOOL (PLUS SOME NICE TO HAVE) 0:18:38 CHAPTER 3 - THE LINE-UP OF SUSPECT GPUs 0:22:54 CHAPTER 4- VISUAL INSPECTION 0:31:55 CHAPTER 5 - RESISTANCE MEASUREMENTS 1:10:09 CHAPTER 6 - VOLTAGE MEASUREMENTS (THEORY ** IMPORTANT) 1:39:28 CHAPTER 7 - VOLTAGE MEASUREMENTS (PRACTICAL) 2:02:49 CHAPTER 8 - THE LIGHTS ARE ON BUT NO-ONE'S HOME It takes a lot of time and effort to make Youtube videos. If you enjoy my videos or they helped you with your own repairs please consider subscribing to my channel or click LIKE Learn Electronics Repair is now on Discord! https://discord.gg/vam6YC8vwU You can send donations via this link https://www.paypal.com/paypalme/youtubeLER You can subscribe via this link https://www.patreon.com/learnelectronicsrepair Errata 0:40:39 - this pin is connected to ground on the ATX PSU but it is not connected to ground on the GPU - it is a sense pin to detect if an 8 way plug is inserted Errata 0:43:25 - 12V not 5V Errata 0:48:44 - Yes I know, I am trying to probe the coil in the wrong place! Errata 0:52:25 - We also need to test shorts to the coils from the 12V on the PCIe connector Errata 0:56:20 - and this is why you need to check ALL the phases of the VRM for shorts to ground. It could be possible to have a short on just this phase. Errata 0:59:45 - The memory controller (which reads short) is part of the GPU Errata 1:04:06 - it is also common to find a coil in this area which is actually a filter for the 12V PCIe supply, and not a buck regulator coil. In that case it will connect to the 12V PCIe and likely (to give you a clue) to have a 16V capacitor connected to it as well Errata 1:09:17 - PEX is the 0.9V-1.0V supply rail, we'll talk about it in detail a little later Errata 1:23:58 - On modern GPUs the BIOS is often powered from 1.8V, but on lot's of GPU it is 3.3V and on vintage ones it could be 5V Errata 1:35:18 - This coil could also possibly be a filter on the PCIe 12V supply coming in Errata 1:37:13 - I should say 'sometimes on either end'. It depends on the type of regulator, the input or output voltage could be on the tab Errata 1:38:15 - IC U9 could be the 1.8V supply Errata 1:23:58 - On modern GPUs the BIOS is often powered from 1.8V, but on lot's of GPU it is 3.3V and on vintage ones it could be 5V Errata 1:35:18 - This coil could also possibly be a filter on the PCIe 12V supply coming in Errata 1:37:13 - I should say 'sometimes on either end'. It depends on the type of regulator, the input or output voltage could be on the tab Errata 1:38:15 - IC U9 could be the 1.8V supply Errata 1:45:36 - Or the memory VRM is faulty Errata 1:53:34 - Yeah I think I measured both ends of the same coil, instead of checking both coils Errata 1:55:20 - I meant to say I forced to to produce an Enable signal Errata 2:01:08 - This middle pin is probably the reference pin actually, the input voltage will probably be the left hand pin Errata 2:01:22 - A vintage board like this may not need PEX as the main Vcore voltage is possibly high enough to handle the interface with the PCIe directly? Associated videos How to trace a Short Circuit on a GPU VRM https://www.youtube.com/watch?v=5cG2aJwNoAw Short Circuit tracing techniques https://www.youtube.com/watch?v=kGM-Zmrr6tc (part 1) https://www.youtube.com/watch?v=NUgO7v4cbKs (part 2) These are affiliate links, you pay the normal price and I make a small commission. TEST METERS Aneng AN8009 https://s.click.aliexpress.com/e/_DdWIynN https://amzn.to/469ZgOS VC480C+ https://s.click.aliexpress.com/e/_DEYs6ix https://amzn.to/3Q3LEz7 https://amzn.to/46tmNdo MESR-100 ESR METER https://amzn.to/3tiy8hK https://amzn.to/3RwvejK https://s.click.aliexpress.com/e/_DmirIEj FNB58 USB ANALYZER https://s.click.aliexpress.com/e/_Dmd8TR1 https://amzn.to/3tb1QW8 https://amzn.to/46oMn30 PCI POST ANALYZER https://s.click.aliexpress.com/e/_DBssfzN https://amzn.to/46m9Gep TL460S Plus PCI_E ANALYZER https://s.click.aliexpress.com/e/_DnBVP1z https://amzn.to/3ZERvOs OSCILLOSCOPES FNIRSI 1014D https://s.click.aliexpress.com/e/_DEzZMVh https://amzn.to/3RxMFk1 BENCH PSU NPS3010W https://s.click.aliexpress.com/e/_DDPJtbD https://amzn.to/3rxsuIf SOLDERING T12 Station with M8 9501 Handle https://s.click.aliexpress.com/e/_DFVdrD9 https://amzn.to/3FdG8Ul QUICK 861DW https://s.click.aliexpress.com/e/_DDo9wKj https://amzn.to/3PBOKZH https://amzn.to/3RCSqNh PROS'KIT SS-331H https://s.click.aliexpress.com/e/_DDo9wKj THERMAL CAMERA Infiray P2 Pro https://s.click.aliexpress.com/e/_Dmuj4a7 https://amzn.to/457PgEb https://www.banggood.com/custlink/DDGPI7hRvU MICROSCOPES ANDONSTAR AD407 https://s.click.aliexpress.com/e/_Dl4xXrD https://amzn.to/3PSQKxJ https://amzn.to/48sxej4 EEPROM Programming TL866 II+ https://s.click.aliexpress.com/e/_DlsAR1H https://amzn.to/3RTCRB9 https://amzn.to/3LDu3Lu