Picked up this snes yesterday and all I get is a black screen when powering it up. I already have a snes mini or slim that came out last so my controllers, games, av cord, and tv works. I even tried the nintendo rf modulator and tv goes from normal grainy grey screen to solid black after powering up the snes. The rf modulator works fine with the turbografx and tv so thats not it. Red light comes on the front when I say powering up. I took the console apart and the cartridge contacts look super clean so didn't bother cleaning those. I found the fuse and I get continuity across the ends but there is some black on the bottom area its soldered to. Not sure if I should replace it or if thats the issue so posting here for some help. The inside looks super clean just with a couple specs of dust/fuz. I tested the voltage regulator thats mounted to the large piece of metal to act as a heat sink and I'm getting 10.1v in and getting 5v out as it should. I'm using an original nintendo snes power supply. Reset button isn't stuck since the tv will alert me vid1 connected after I hit the reset.
All that gooey looking stuff is flux, indicating that those parts have been replaced before, the flux was never cleaned off. It's not harmful. The first thing to check is if the voltage regulator is outputting 5V. Use your multimeter that you used to test the fuse, set it to measure DC voltage, and put the red lead to the "O" pin seen in the first pic, and the black one on top of the RF metal shield in the top left of the pic. You should get something close to 5V. If not, check the "I" pin with the red lead, and keep the black one on the RF metal shield. What do you get?
I bought couple "not tested/working" SNES off Ebay. When I tested them, most will work on some carts and will get black screens on other carts. One of black screens, will only work on SD2SNES saver cart. I guess it still could make good connections with the new connector on the saver cart, as bought it this year, or the cart has extra outside pins or something else the saver cart has nor doesn't have compare to the regular carts? When I clean the cart slot, most of the SNES will work with all the old carts I tested on them. I had one that will not work with Bulls vs Blazers cart. Also one that works with all my carts, but the controller port will go crazy when certain controllers are plugged in, mainly 3rd party ones. Back to the topic starter, look the someone already try to fix it and replace all of the power related parts. Not going guarantee this might work, you could try replacing the capacitors on it with good ones made by Panasonic.
The IGO on the regulator for the In I get 10.1v and for the Out I get 5v like I posted in the opening post. For ground I was careful and had it on the center Ground pin. I still need to test the voltage on both sides of the fuse.
Oops didn't see that, sorry. Are you getting any audio when powering on with a cartridge? If not, it sounds more like cartridge slot. You can also check the voltage across the blue capacitor, but that might be fine. Does the cartridge slot look original?
This is what the board looks like and didn't realize the cartridge slot is just pressed on. All the contacts look clean but went ahead and cleaned them but still no luck. I'll check the capacitor voltage tonight and thinking of taking the shell of a game cart, inserting it, then testing continuity from each pin on the cart to the bottom of the board to make sure each line is good.
Capacitor reads 10.15 volts. So frustating I can't get it working. Still need to test continuity of each game pin of a cart to the bottom of the board.
Check to make sure that +5V is getting to the CPU, the card slot, etc. You can find schematics here. I'm thinking it is the card slot, I would think you would at least get sound if it was a problem with the video.
