The GPU REPAIR GUIDE. How to fix GPU /Graphics card not detected. AMD Radeon or Nvidia
0Learn 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
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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)
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