So I finally have time to start tackling a few issues with my LW3.

My first issue was the DMD either going blank or garbled whenever you shook the machine, or knocked on the screen. The solder joints behind the DMD looked shiny and fine, so I gave the male connectors a quick cleaning to try get a better connection. The screen seems to be fixed for now, but not sure if it's related to my next problem...

Before the cleaning, sometimes the audio would completely turn off with the DMD screen during a good shake.

After the cleaning, two different audio issues happen.

1 - The game will boot, start and play like normal, and then the sound track will turn off and only the switch-hit sound effects will come through.
2 - The game will boot, start and just keep repeating Back in Action. Back. Ba. Ba. Back. Ba. Back in Action ect.

It has a one of those all in one RottenDog MPU's.

Just waiting for my gimbal to charge up so I can record a video, but until then, is there anywhere I should begin investigating?

I do have a DMM, but damned if I know how to use it so any help in maximum layman's would be appreciated!

Here's a video

Any help would be appreciated!

Alright lets go one step at a time.
Oh, and that said... super sorry in advance for how much I don't know about this stuff... Even down to terms and lingo, it's all new so I'm feeling pretty cautious.

Here's my board. Everything looks fine to me, and nothing changes audibly or on the DMD when I wiggle things around.
IMG_0656 (resized).jpeg
Here is where I'm assuming I was supposed to check the voltage.
I turned my DMM to 20V DC. Put the black on TP2-GROUND and got the following with the red lead:
TP3 +12V: 11.22
TP4 -12V: -15.10
TP1 +5V 5

Is this enough info to help direct me to where should go next!?

IMG_0657 (resized).jpeg