Snes repair FAQ (work in progress)
Snes FAQ:
Ive tried to document the snes errors and how to fix them as good as i could
(still learning about it and finding new errors and finding out how to fix em) i
take no respons for anything writtin in it its on your on damn risk. dont like it ?
well fuck you try writting a better one 6 in the morning with a hangover. yeah its
probably got like 1 billion typos or bad grammar but my main language aint english
its SWEDISH. here's the faq.
oh btw if your planning to "steal" it for a page or so please ask for permission
first ill probably dont care and say its ok but still i wanna know where it can be
found. ill update it if i find out anything more.
Wanna help out a bit ? you can do this 2 ways either send me an issue that is common and how to fix it "concreet evidence" not guesses please. or you could aid me in my quest by sending me busted up consoles (all consoles are welcome broken / working)
Q. why doesnt my snes power on?
A. one of the following or multipl might be the cause: the adaptor is broken, the fuse
is blown, the 7805 inside the snes is broken the switch is broken.
Q. ive changed the 7805 but my snes still doesnt poweron, when i push the power i get power for an instance as the led flashes what is the problem?
A. Behind the 7805 if you remove the Coolingplate there is a small surface mounted component named D1 replace it (not sure what it is some sort of geizerbridge?)
Q. Why does my snes fuse bust all the time?
A. Your either got a broken U12 (7805) or lack the C87 Cap
most common on snes with built in Soundcards. Value of
C87 should be about 2200 uF 50V.
Q. Why doesnt my snes work with a nes/snes ac adaptor?
A. Either the adaptor is broken or your snes lack the DB1 (sometimes marked as D1)
Geizerbridge (some snes with build in sound cards lack this component)
try replacing it with a bridge that can handle atleast 1.5A!
Q. Why is the Screen black when i try to play an import ?
A. The lockout chip causes this problem (otherwise known as U8) lift leg 4
to solve problem.
Q. What would happen if i bypass the Fuse?
A. Basicly nothing of greater importance, the fuse purpose is to avoid U12 from
killing itself and the rest of the snes when it malfunctions (if for some
strange fucked up reason it tries to drain more then the max current it
can handle) this is often not a problem since U12 doesnt let power pass
once its fried.
Q. I can hear sound but it sounds really really bad and cuts what the problem?
A. your amplifier is probably malfunctioning due to failure of surrounding components
check if the amplifier cap aint displaced (not soldered as it should be like
shifted 90 degress, yes a robot slacked off and fucked up) should be a cap connected
somehow with a circuit named something like LM3xx (cant remember the possition).
Q. I get screen but some or all sprites look strange how do i fix this?
A. Check U4 and U5 for solderbridges or other oddites if you cant see anything try
replacing one at a time. (U4 and U5 are the video ram used by the PPU's)
Q. The screen fades down when i use the A/V output but not when using the RF input why?
A. Remove the Capacitors in your RGB cable due to some issues some snes units specially pal fade down and some dont even display picture at all when you use a rgb cable with caps in it (ALL fabrical constructed cables have CAPS)
Q. How come you know so much about the snes?
A. ive seen a blue print of it or rather a badly reverse enginered blueprint.(most
things on it doesnt make sense like why 50% of all pins ar grounded without any
type of explanation of their purpose)
Q. Will my US adaptor fit a Jap unit ?
A. No! there are 3 types of plugs on the snes the US, Pal and Jap. Pal and Jap look
the same but Pal uses possitive voltage in the middle while Jap uses the outside.
the Us have the same voltages pinouts as the Jap one but a diffrent plug.
Q. Do US snes have RGB output?
A. Yes all types of Snes do have RGB output but youll need a US with that supports
RGB input in the scart connector.
Q. What type of outputs do the snes have and what is the best? and why?
A. Snes supports RF, RGB, Composit and S-vhs. RF is avaible on all snes without any
extra cables its also the worst one of them all since sound and picture is encoded
in the same cable using diffrent frequencys, Composit is like a cleaner version of
the RF its almost the same but instead of having sound sent in the same signal its
seperated on its own (RGB S-vhs and Composite all use the same sound pins), RGB
is a clean seperation of RED GREEN and BLUE signal all colors are stransmitted as a
seperat signal along side with an additional signal called SYNC this is the best
hence its more sharp colors. S-Vhs is a compressed version of RGB and like most
compression you lose quality.
Q. Some games tend to reset after i while when i use a RGB cable why?
A. This is a common issue on some games with special copy protects like yoshi's island
to solve this issue replace your original snes AC/AC adaptor with a AC/DC adaptor.
the ac/ac adaptor causes ripples and interrupt something on the screen output part
causing the copy protection to active when receiving a loopback from the rgb toggle.
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Originally Posted by Mr. Smashy
