3080 Ti Repair - Nvidia PCB Manufacturing Defect Catastrophic Failure. MPS2886 Feedback Circuit [1]
Channel: GregTech
Date: 2022-12-21

*Need your graphics card repaired? Visit https://gfxrepair.com*

Today I explore a technical flaw within the MPS2886B PWM controller from Monolithic Power Systems found on RTX 30 series cards assembled by Nvidia. (2020 - 2021). 
The fault in question is related to the feedback circuit for the uncore pwm controller. A severed ground trace turned a differential amplifier into a voltage follower, sending 1.5v into v-core. 

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MP2886 Datasheet:
https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP2886AGU/

What is a differential amplifier?
https://www.electronics-tutorials.ws/opamp/opamp_5.html

What is a voltage follower?
https://www.electrical4u.com/voltage-follower/

Superposition theorem in operational amplifiers:
http://www.ittc.ku.edu/~jstiles/412/handouts/2.4%20Differnce%20Amplifiers/Superposition%20and%20OpAmp%20Circuits%20lecture.pdf
https://masteringelectronicsdesign.com/category/superposition-theorem/
https://www.sciencedirect.com/topics/engineering/differential-amplifier#:~:text=The%20Differential%20Amplifier-,The%20differential%20amplifier%20circuit%20amplifies%20the%20difference%20between%20signals%20applied,at%20the%20final%20output%20voltage

*Other recommended video creators in the repair and overclocking space:*
https://www.youtube.com/@TechCemetery
https://www.youtube.com/@CmdrSoyo
https://www.youtube.com/@ActuallyHardcoreOverclocking
https://www.youtube.com/@LuumiJuhani
https://www.youtube.com/@gerrepair7862
https://www.youtube.com/@VIKon-msk
https://www.youtube.com/@notebook31
https://www.youtube.com/@ITsystem
https://www.youtube.com/@masterliu1892
https://www.youtube.com/@3kliksphilip

*External Footage Credit:*
Nvidia 30 series launch release
https://www.youtube.com/watch?v=E98hC9e__Xs&t=2097s
MPS commercial
https://www.youtube.com/watch?v=zYDuOi1L_bY

The Nvidia RTX 3080 Ti FE (Founders edition) was one of the most sought-after cards on the market. With its performance eclipsing the 3080, and just barely keeping up with the 3090, the RTX 3080 Ti is the best bang for your buck gaming graphics card you can buy for your PC.