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Help! Game Board Repair (Super Pang)
CHRIS-F:
--- Quote from: Titchgamer on July 01, 2019, 08:30:27 pm ---Dude, At this point in time I think you are better off just getting a new board.
Dont get me wrong if your having fun and learning crack on but if you want to actually play the game for what its going to cost you in time and money its scrap.
After all its only about £30 to get a replacement.
--- End quote ---
Yeh! I'm really enjoying learning a bit about electronics as I go, I don't want to be defeated by it lol, I'm sure I just killed one of the IC's when I shorted it, I intend to buy a few more games in the near future, but would like to do a bit more learning before I try to tackle a monitor recap/repair :-)
Funny thing is my pcb feet arrived today if I had them in the first place the first short caused by the lifted trace probably wouldn't have happened.
Titchgamer:
I think a recap is probably much easier than what you are trying to do atm lol
But I have a faulty tekken 2 board I can sell you if you want to tinker lol
CHRIS-F:
--- Quote from: Titchgamer on July 02, 2019, 05:20:35 pm ---I think a recap is probably much easier than what you are trying to do atm lol
But I have a faulty tekken 2 board I can sell you if you want to tinker lol
--- End quote ---
Not really my cup of tea Tekken, but thanks for the offer :-)
Now for the good news, I suspected the 74LS368AN at IC 13 was somehow faulty as there was no clock on the main Z80, I traced the clock signal back to IC 13 and it was in the same region as the IC where my test probe slipped, I removed the IC carefully and lo and behold I found a burnt out trace on pin 15, I must have slipped and shorted 5v to Gnd, I fixed the trace and fitted a socket, I ordered a new IC already and I really didn’t expect it to work again as I had to heat it up a good few times to remove it, but I was really surprised when I tried it and it worked, I also replaced the oscillator and it seems to be working fine again, just need to sort the small sound problem out next :-)
CHRIS-F:
Little Update:
I am happy to report my board is now working 100% thanks to a Z80 hardware guru in the ZX Spectrum community, who helped me trace a problem in the reset circuit, which also fixed the odd sound problem, I guess the reset wasn't initialising the Yamaha YM 2413 and the OKI M5205 synth chips properly, I did make a few Noob mistakes and make this board worse in the first place but I don't mind as I've learned a bit in the process:-)
So what have I learned;
1. Use those little plastic PCB feet to stop any board damage moving the board around in the cab or on a bench.
2. don't trust old electrolytic capacitors even if the capacitance looks ok.
3. don't use test equipment in the dark/bad light.
The main problem was the two electrolytic capacitors in the reset circuit, they both tested ok in my Chinese component tester (capacitance wise) but after replacing them, the board now boots every time and the sound is correct :-)
Mike A:
Glad to see you got things up and running. :applaud: