Hello,
I (almost) repaired an Nvidia RTX2080 card where the memory VRM was outputting only 0.3v instead of the expected 1.35v. The problem ended up being a SOT component marked Q32 on the PCB, which is generating the reference voltage for the memory VRM controller up9512p (it was outputting exactly 0.3v, which the up9512p faithfully replicated at the memory VRM output).
I found another identical component in the fan controller circuit and swapped them around, this fixed the memory VRM but of course now the fan doesn't work.
I'm attaching a photo taken with my phone (i hope it's clear enough) of the defective component in the memory VRM circuit. Pin 6 connects to the reference voltage input pin 1 of up9512p through a 100 ohm resistor (there is another 2.7k resistor from up9512p pin 1 to GND). I haven't taken notes of the voltages on the Q32 pins but if my memory is correct pin 1 is connected to GND, there was 2.7v on pins 2, 3 and 4 and there was some voltage i can't remember on pin 5. Pin 6 is connected to refin pin on up9512p. My memory could be wrong though, please take this with a grain of salt. At the moment the graphic card is fully assembled and it's used in my PC, according to the GPU bios the fan is not even supposed to start up until the hottest component on the card reaches 65 degrees Celsius. My PC usage doesn't get the GPU to warm up to that temperature, so the fan is not actually needed. Of course the story will be different if i put some load on the GPU. The GPU core never warms up more than 43.5 degrees Celsius, the RAM never warms up more than 52.6 degrees Celsius and the hottest component of the card never warms up more than 53.4 degrees Celsius.
I can't figure out what this Q32 component is, the PCB would imply it's a transistor or a transistor array, help please ?
Thank you very much in advance !
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