Hello
If you have a large magnifying glass or a microscope start by making a general visual check of the components (if on the outside a component is askew unsoldered, or burnt its may be a deut of track)
following some tutorial of online repairers I send you a help link for the voltage measurements to be checked on your card in general. https://youtu.be/5oD69tIrU7c
give us the exact model and the brand of your graphics card I can be the corresponding diagram.
if nothing is conclusive the use of a thermal camera even inexpensive to help identify a faulty component (they tend to heat up when they are out of order) can help especially when we do not have the diagrams
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