No audio on PAL SNES

MDK · Post by **MDK** » Fri Jun 13, 2008 6:53 pm

Rightey ho, I'm doing my level best to get myself a working Portable SNES, based on a PAL version - no mini board for me <_<

Anyway, after almost a year, three screens and a fair ammount of singed flesh, I'm almost done. I just need to sort the audio, add a charging circuit, and stick it in a case.

Unfortunately, the audio seems to want to delay things, and i can't get any audio at all. I'm using an official PSOne screen, and it just isn't liking it. I'm afraid that I've blown the audio circuits somehow, but everything else is fine.

As I'm feeding 5v into the SNES from the screen regulators, I'm thinking that it could be something to do with the lack of higher voltages not powering something - an op-amp, say. Is this remotely feasible?

I'd really rather not have to get a new SNES to sort his out... I've re-wired the bloody cartridge slot on this thing! I don't want to do that again ;_;

Post by **CronoTriggerfan** » Fri Jun 13, 2008 8:27 pm

Are you soldering to the audio pins on the A/V connector or the sound chip directly?

bacteria · Post by **bacteria** » Fri Jun 13, 2008 10:09 pm

You say "feeding 5v into the SNES from the screen regulators" on the PSone screen - as I recall, these have a maximum output of 1 amp; yet a PAL SNES takes 1.3 amps - this might be the issue.

MDK · Post by **MDK** » Sat Jun 14, 2008 6:00 am

CronoTriggerfan wrote:Are you soldering to the audio pins on the A/V connector or the sound chip directly?

I'm using the AV connector, I have no idea what or where the sound IC is, or the pinouts for it. All the instructions for wiring sound from an IC are for the mini SNES, as well, and the PAL SNES Doesn't appear to have that IC. If it does, it's got more legs on this version.

bacteria wrote:You say "feeding 5v into the SNES from the screen regulators" on the PSone screen - as I recall, these have a maximum output of 1 amp; yet a PAL SNES takes 1.3 amps - this might be the issue.

No, that's not an issue, and never will be. the 1.3 Amp rating for the PAL SNES is the maximum current it can handle. It CERTAINLY doesn't use anything like that much current in the real world. My SNES and LED-Modded PSOne screen pull just over a half Amp in operation.

bacteria · Post by **bacteria** » Sat Jun 14, 2008 9:01 am

MDK wrote:No, that's not an issue, and never will be. the 1.3 Amp rating for the PAL SNES is the maximum current it can handle. It CERTAINLY doesn't use anything like that much current in the real world. My SNES and LED-Modded PSOne screen pull just over a half Amp in operation.

That's good news for me, I thought I was looking at 2 amps between a PAL SNES and an unmodded PSone screen; not about a third of that!

Post by **CronoTriggerfan** » Sat Jun 14, 2008 12:51 pm

Well, it's got to have an audio IC somewhere, but I have no clue what it looks like on the PAL SNES. The reason I ask is that if you were to tap the audio straight from the source, you would know if you fried something or not. I suggest doing some searching to see if you can find the component itself, perhaps even whipping out the multimeter and checking your leads.

MDK · Post by **MDK** » Sun Jun 15, 2008 4:55 pm

CronoTriggerfan wrote:Well, it's got to have an audio IC somewhere, but I have no clue what it looks like on the PAL SNES. The reason I ask is that if you were to tap the audio straight from the source, you would know if you fried something or not. I suggest doing some searching to see if you can find the component itself, perhaps even whipping out the multimeter and checking your leads.

Finaly found the audio IC. Something inbetween the IC and the AV port must have been fried. Anyway, if anybody's interested, see my other thread for the PAL IC. I CBA to post it all again here

So, yeah. Problem solved. If a mod wanders in here, feel free to close this.

Post by **CronoTriggerfan** » Sun Jun 15, 2008 10:18 pm

MDK wrote:So, yeah. Problem solved. If a mod wanders in here, feel free to close this.

Gladly.

Locked.