I have an SNES which powers on, but displays no video/audio. I was wondering if there are any known issues to check. I've tried the following: Tested AC adapter on another SNES (Working) Tested video cable on another SNES (Working) Tested multiple games (No difference) Inspected motherboard for damage to traces, etc. (Found none) Tested continuity between cart pins and solder points (All fine) Tested continuity from video/audio port pins to solder points (All fine) Attempted to power on without sound module (Powers on but still no video) Not sure what kind of POT is on the front of the motherboard but it tested to 00.03ohms. Is there a desirable range for this? I have other SNES systems as spares, but this one has sentimental value.:crying:
Sorry to sound like a stupid customer support guy: Did you try a different game, or the cart on another machine? Is it the correct region?
I should have put that I tested different games, and yes it's the correct region. And no distended capacitors. =/
Are you getting a black screen or just static? Also, are you using RF, composite or another type of connector?
Black screen with composite. Can't remember if RF gave a black screen or just snow. Edit: Actually the only TVs I have are LCDs which would be black before the console was on -- So I can't say for certain. The one I'm using give me a no video signal warning on the screen, however when I power off the console I get a flash of light on the screen and a pop. Motherboard and cart connector just got a good alcohol dip and scrubbing and is now drying in the sun.
Fixed! It was the reset switch. I noticed on another SNES if I held reset and powered the console on/off you get that same power pop. Desoldered the reset switch from the bad console and it works now. The switch looked sort of nasty on the bottom like coke or something got spilled when I was a child. Going to soak it, dry it and resolder it later.
So it was stuck with the reset button pressed electrically? That's funny. Glad you figured it out and fixed it, saving it from the scrap heap.
I had to break the switch down and rebuild it. The contacts on the inside were corroded together. Not sure how that happened. The switch itself comes apart real easy. Bending the copper contacts in to the right shape and seating them properly is another story all together.
The only un-yellowed SNES I have has the exact same symptoms. I wonder if its the reset switch as well? Too bad I dont have a gamebit yet
Well I've heard that Cola, like Coke you can pour into a Glass and put something like a Nail or Screw in it and within a few days it will completely dissolve it. So if you did spill alittle bit of soda on it and it got under the reset button maybe that's how it happened.
Most soda sold in the US contains phosphoric acid, which does a number on copper and other metals used for mechanical switches. But depending on where and how the console was stored, corrosion could have happened simply due to humidity or condensation. The lack of a gamebit isn't an issue for disassembling an SNES if you have the right hex driver. I think the 5/8 inch hex head can be used to remove them pretty cleanly, but it's no good for putting the bolts back in.
