I had some strange occurrences from my A13 over the last few weeks. My brother was visiting a few weeks ago, and he was playing my a13, trying to beat my high score as he does... and he says "it's acting funny, the ball won't kick up to the shooter lane".
I've had some issues with the ball trough intermittently that I haven't been able to completely fix, so I didn't think much of it. Then we smell smoke. The coil on the upper pop bumper had melted, and the driver transistor had fried as well.
I didn't have a replacement coil so I ordered one, but I did have a spare transistor, so I replaced that and put the board back in the game to await the coil.
I got around to rebuilding the pop bumper with the new coil and put the game back together to test it out. I started playing a game, and got the video mode and landed the lander, but the ball would not kick back out of the VUK. And then I smelled smoke again.
I looked in the backbox, and the driver transistor for the VUK was really fried. Have a look!
Fried transistorFried transistor 2
I replaced the fried transistor. The VUK coil looked ok and I have so rarely had issues with coils that I didn't really check it very well, I put everything back together, but the coil wouldn't fire in test mode. Hmmmm... to make a long story short after about an hour of testing things, I realized the coil only had .8 ohms resistance. I guess it melted and shorted internally. The only thing I can't figure out is why these problems occurred. The only theory I have at this point is some weird glitch with the CPU/Driver where these coils locked on.
Anyway, now I'm waiting on a VUK coil. Hopefully I won't have another coil melt when I put this one in... Has anyone seen anything like this before?
Fixed and cleaned up