SF2 World Warrior A board - sound cutting out

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Re: SF2 World Warrior A board - sound cutting out

Postby NoAffinity » February 20th, 2017, 8:50 pm

Finally got back around to this. I ponied up for a Hakko desoldering gun, which they had on the shelf at our local big box electronics store. A bit of an expenditure, but well worth the investment already, just in the time saved desoldering parts from boards in this effort alone (and I've got plenty of other projects lined up that it will make quick work of).

Okay, back on topic. I pulled the SRAM and YM2151 off of a parts board, which had working sound but graphical glitches due to a failing custom chip. I soldered them on, and still have the same problem. :cry:

What next?
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Re: SF2 World Warrior A board - sound cutting out

Postby leonardoliveira » February 20th, 2017, 9:18 pm

Some failed TTL? Any fujitsus? :lol:
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Re: SF2 World Warrior A board - sound cutting out

Postby NoAffinity » February 20th, 2017, 9:20 pm

leonardoliveira wrote:Some failed TTL? Any fujitsus? :lol:

What should I be looking at specifically on the board - components and measuring?
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Re: SF2 World Warrior A board - sound cutting out

Postby leonardoliveira » February 20th, 2017, 9:21 pm

look a photo of the A board from a CPS1.5 game. Look which chips are missing, those will be the sound parts you need to check.
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Re: SF2 World Warrior A board - sound cutting out

Postby NoAffinity » February 20th, 2017, 9:27 pm

And what should I be testing or measuring at those? Please forgive the noobishness. Again, working through this for the first time, but learning as I go. :thumbupright: :-D
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Re: SF2 World Warrior A board - sound cutting out

Postby leonardoliveira » February 20th, 2017, 10:06 pm

A chip programmer which can test SRAM and TTLs is very helpful on this hobby. :awe:
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Re: SF2 World Warrior A board - sound cutting out

Postby NoAffinity » February 21st, 2017, 4:31 pm

leonardoliveira wrote:A chip programmer which can test SRAM and TTLs is very helpful on this hobby. :awe:

Any good models to be recommended?
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Re: SF2 World Warrior A board - sound cutting out

Postby leonardoliveira » February 22nd, 2017, 6:28 am

If you have a chip programmer, yours might already do it.

I think only cheaper stuff like Willem won't test TTLs and SRAM.
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Re: SF2 World Warrior A board - sound cutting out

Postby NoAffinity » February 22nd, 2017, 8:14 am

leonardoliveira wrote:If you have a chip programmer, yours might already do it.

I think only cheaper stuff like Willem won't test TTLs and SRAM.

Yeah, my GQ-4x4 won't do them. I ordered a G540 tester off ebay. It has mixed reviews, but from what I saw, older reviews weren't good, newer reviews are. So, I'm hoping that's an indication that they've worked out the bugs over the years, and it's now a good low-cost solution. Plus at $50 shipped, I'm willing to take the gamble. At $500+ for a higher-end model, I'm not even a player.

Hope to be reporting back with good news in a couple weeks, both with regard to the tester and the board.

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