DTL-H1002 Playstation sound issue, bad caps?

I recently acquired a blue DTL-H1002 debug Playstation. It is supposedly a japanese unit which was plugged into 240V. The big filter capacitor on the primary side of the PSU is blown. I've switched the PSU and it boots up, but there's a loud, high pitched noise on the audio output.
Here's a video of it (turn down your speakers):


As you can see, the noise disappears while at the bios screen and playing an Audio CD but it's back as soon as a game starts up.
If you look closely at the right side of the screen, there's some unusual rainbowy pixels. With a TV capture card I managed to get an uncropped image:

The contents of this change depending on the image, it seems like part of the video RAM.

Has somebody seen anything like this before? Is it likely a capacitor issue? The board looks clean with no visible leaking caps, but as always this doesn't mean they are ok.
I thought I'd ask before I waste my time tracking down what seems like 50 SMD capacitors.

 

I had same issue with a scph-1000, fix was replace the SPU, I used a scph-1002 as a donor.

http://assemblergames.com/l/threads/demonic-audio-from-scph-1000-ps1.59662/

 

That's super helpful, why didn't I see this thread before?
Thanks!
I currently don't have another SCPH-100x but I will swap the SPU once I get my hands on one.

 

I remembered that I still had a PSX with a broken disc drive somewhere, and it turned out to be a SCPH-5502 (PU-18) with a compatible SPU.
Bit of a shame to use this one as a donor since it's in decent shape otherwise, but the DTL is more important right now and maybe I'll get another SPU from somewhere later.
Out with the old


In with the new


...aaand the audio works perfect again!
Thanks Bad_Ad84 for pointing me in the right direction!
I also fixed the original 110V PSU by replacing the capacitor. The artifacts in the overscan area of the image are still there but only during the BIOS, they are gone once a game starts up. I guess this is just a quirk of this debug unit. PSX BIOS Dumper shows that the console's region is PAL for some reason.