/diy/ - Do It Yourself

There seems to have been a huge arc across the input connector; there seems to be a little bit of the pad missing on each of those solder joints. Could you verify this?

If this is the case, it's seen a HUGE overvoltage (lightning strike or the like), and I doubt that you'll be able to troubleshoot it as a novice electronic DIYer. Likely the mains fuse has blown because the power supply controller chip has gone on fire and killed a bunch of stuff as it went down.