The game going into 04 mode usually represents a battery or battery corrosion to the board issue. Additionally when funky things start happening with the game, it sometimes indicates a problem with your 40 pin. Instead of spending a lot of money guessing, I'd suggest to just buy a new MPU board for 300. If your lucky, it could possibly fix your sound issue too.

I'm guessing it's blowing another fuse at the end?

I had a Gorgar that started in 04 mode for years. It wasn't a big deal, because I could turn it on and off, this would fix the problem. I believe when I replaced the battery holder with one that is detached from the board, fixed the 04 mode issue
I couldn't hear any sound, but it looked as if it was playing ok and possibly blowing a fuse? If the fuse is the reason why the game stops playing, it could be due to a plunger jamming up inside a coil. Check and make sure your plungers are moving freely. You could also have a mushroomed plunger that is creating drag inside the coil, causing the fuse to blow

Also check and see if any of the coils are staying on. Listen for a humming noise or the smell of smoke.

And get that sound board fixed!! Stellar Wars has awesome sounds!

Sound board-
Unplug all of your connections on the top right board and plug them back in (power off). Turn back on and listen for any changes in sound. I believe this is your sound board. Sometimes you have a loose connection or old solder joints. You can also rock the connections back and forth while game is in play and listen for any changes

Yes, I really enjoyed this game when I had it.

Tilt switch appears ok.
Sometimes the ground wire can cause solenoid fuses to blow. Make sure it looks good and there should be one ground wire that runs from the cabinet and into the backbox. Which then screws to the bottom inside of the back box

Yes, it's another tilt. Your game is popping fuses and not tilting. Should be good there

The only other thing I have to offer, is check your wiring to all the coils. Make sure they aren't touching each other. Also, is there a specific coil that blows the fuse?

Check again that no coils are stuck on. I believe it's normal for the coin lock out to be on, everything else should be off

So when the ball is in the playfied, the game continues to try and kick out another ball onto the shooter lane?

If so, sounds like you have a stuck rollover switch in your eject hole, under the trough. Lift the playfied and make sure the rollover switch has enough gap and not touching after the ball passes

Probably not. It works as a tilt if someone wants to pick up the machine. There's a least 3 tilts on you game

The battery on my phone is dieing. Good luck. I'll check on you later. There are people with way more experience than me. Maybe they'll chime in.

As Da-Shaker stated, that is a problem. Maybe not the only problem, but fix that one. That switch should only make contact when the ball is resting in the outhole.

I wouldn't buy a board yet, especially an old system 4. If you do get a board you should buy new. They come with a MPU and driver board in one. Kills two birds, one stone. Fix the playfied issues first.

Additionally, since you have a system 4. Your sound board should be inside the cabinet on the left side, not in the backbox like I said earlier. Try reseating the connections that attach to the board, to help your sound issue.

Swweettt!
No more fuses popping?

Roms can definitely be an issue. Wiggle connections and push on sound board chips while the game is playing first. Listen for any changes to sound. If nothing, I'd recommend to remove the board and reflow solder to to the back of connection solder joints. If still nothing, replace rom and hopefully the rom chips are socketed, so you don't have to solder.
When soldering, make sure you don't cross contaminate solder joints.

Looks like your sound rom is socketed.
Oh, you did try to turn up the volume correct, inside the cabinet? And the top right dial on the board is a volume adjuster too, I believe

Actually, that might be your tester button and the other volume dial might be in the middle of the board

Then if the rom doesn't work, replace all your capacitors and cross fingers.

I would definitely change all the electrolytic caps on the sound board and reflow the pin connectors, and clean/replace the volume pot before replacing any chips.

Hard to tell in your pics, but the large blue cap appears to be bulging at the end.

Several of your board chips are socketed, including the game chip. You could carefully remove and replace to reseat them.

I don't know if it's normal, but it appears you have a resistor that's at a 45 deg angle soldered to a chip area. Look towards the left side of your board in the middle, next to the other 2 chips. Maybe do a little research on that, check and see if that's correct.

Is this a bent pin? High def pics in indirect sunlight would help.

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I don't think so. Looks like it's soldered to the board, hard to tell. Usually bent pins come from people removing a socketed chip and then putting it back in. Sometimes all the legs don't get seated well and causes a bent leg or pin.

Hard to tell in your pics, but the large blue cap appears to be bulging at the end.
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Is the 3rd silver cap bulging, upper right side?

I would continue with previous recommendations. Additionally your 4th and 5th photo, you might have some corrosion in the upper left corner. I'd use a razor blade and draw a line between the two solder joints to make sure they don't touch.

Looks like it's in really nice condition. Congrats, mine was beat up, but played well. Especially after a nice clean/wax job and 1 drop of 3&1 oil on the spinners.

My guess is you'll have good luck with the rom chip. Be careful pulling them in and out. Keep us posted

I'm still betting on the caps and the volume pot. Did you try cleaning the pot with contact cleaner? Maybe only a temporary solution, but it's likely dirty. Also, this cap pictured looks bulging. Regardless, the caps are 41 years old and have all outlived their life expectancy.

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NICE!

any update on the sound problem?