My Donkey Kong Blow'd Up!

postmortem01

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I picked up a Donkey Kong Red. It came with a 4 board version. It was having some issues. Jumbled characters, etc. I tested the power supply and everything seemed to function properly so I did the unthinkable. I plugged my 2 board Donkey Kong into the cabinet. Oh MY GOD!!!! What was I thinking?!?

Pow! and Flames!

C14 (33uf) and C13 (33uf) blew up
R33 (150ohm) caught on fire

Turns out that the audio amplifier in the TV chasis was feeding back voltage or something like that. I replaced the above mentioned components. I replaced the sound amp from the tv chasis with a known working one. I hooked it back up. I can hear the audio playing but just very quietly from the speaker. Any ideas?

I also replaced the C1815 at Q3

photo2phn.jpg
 
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I don't quite understand what happened, but since those two electros blew it wouldn't be a bad idea to replace the others in that section of the board.
 
I don't quite understand what happened, but since those two electros blew it wouldn't be a bad idea to replace the others in that section of the board.

I would also replace the transistor q3 and that other resistor right next to the burned up one, it looks like a 150 ohm. Test the traces in that area as well
 
I replace Q3. I replace all resistors in that section. I replaced two capacitors. I recapped the audio board and replaced the audio transformer on the monitor chasis.

Everything works now. Woohoo.
 
I'm confused - what did you do?

I don't see how plugging a two board set into a cabinet that had a 4 board set could cause problems.
 
I don't think it had anything to do with two board vs. four board. There was a problem with the audio transformer on the monitor chassis that back fed voltage into the pcb and blew up some components.
 
Yup, I'd bet that's what happened. I did the same thing before. If you plug JC and JB in backwards, when you turn the game on it smokes that same area of the board that's smoked in the pictures (the audio section)
 
Yep. I blew it up. I was cleaning the cabinet and accidentally blew it up. I've replaced all the resistors, capacitors and two of the 2sc1815 things. I'm still getting no sound.

Could it possibly have blewn up the MB3712?
 
I was cleaning the parts and recapped the monitor. When I put the chasis back in the machine, I switched the JB and JC connectors on the audio board an blew it up.
 
I did the same thing yesterday on my 4 board set. Did you ever get it running? If so what parts did you replace? Also do you know where the lm324 op amp is for the digital sound. I just need the location on the sound board. None of my chips are marked Lm324.
 
Add me to the list of idiots who accidentally switched JB and JC on the audio board when hooking my DK back up after a cap kit. Blew the same exact components as the OP. Going to gather the parts tomorrow and hopefully fix my PCB. Ugh. Probably the dumbest mistake I've ever made in this hobby so far.
 
Ya that sucks but=

Add me to the list of idiots who accidentally switched JB and JC on the audio board when hooking my DK back up after a cap kit. Blew the same exact components as the OP. Going to gather the parts tomorrow and hopefully fix my PCB. Ugh. Probably the dumbest mistake I've ever made in this hobby so far.

one things for sure in life and in arcade repair. You learn from your mistakes!
 
Add me to the list of idiots who accidentally switched JB and JC on the audio board when hooking my DK back up after a cap kit. Blew the same exact components as the OP. Going to gather the parts tomorrow and hopefully fix my PCB. Ugh. Probably the dumbest mistake I've ever made in this hobby so far.
I did it on my Punch-Out. Recapped the monitor and sound board, then switched the connectors when I put everything back together and let the smoke out. Surprised the hell out of me, since I was looking right at the PCB when I flipped the power on. (Fireworks!) I had to replace a couple of resistors, an IC, and maybe one other thing.

I think we have a large enough dataset to positively confirm that it is not our fault, but caused a design that lacks appropriate error correction :)
 
I did it on my Punch-Out. Recapped the monitor and sound board, then switched the connectors when I put everything back together and let the smoke out. Surprised the hell out of me, since I was looking right at the PCB when I flipped the power on. (Fireworks!) I had to replace a couple of resistors, an IC, and maybe one other thing.

I think we have a large enough dataset to positively confirm that it is not our fault, but caused a design that lacks appropriate error correction :)

Haha, yeah, it startled me as well. All my years putting Nintendo cabs back together and plugging stuff back in, never accidentally switched the connectors. I guess I was in a rush to just get my DK going again. Still kicking myself this morning.
 
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