Is there a guide to troubleshoot physical issues with an RPI board?

[/RaspberryPi]

I have a Pi 4 which won’t book and I know it’s a physical issue as I have 6 pi’s that work with with same SD card, power cable, with cable etc.
The pi gets power as it shows a red light but never flashes green so I ASSUME it’s something with the card reader.
My issue is that I can’t find any advanced troubleshooting guides online as the majority of rpi issues can be solved by replacing the peripheral components.
I have a rudimentary understanding of electronics and have a basic set of electronics equipment including soldering iron & multimeter. I just need some sort of guide to help identify the root cause etc. any help is greatly appreciated.

submitted by /u/Just_a_neutral_bloke
[link] [comments]

More...