SNES Generation 1 Video Problems, 50+ Units with same defect. RF Works Fine, RCA Output BAD

[RP2A03]

if at all possible I would tap into the 6592 directly and see if you get any thing there, if not then you'll rule out trying to find something between there and the plug.

also isn't the 6592 the one labeled S-ENC some times? you could see if you get component video off of it if its the same as the S-ENC's and maybe find if a particular channel has gone bad (y, pb, pr) or something

Remember that his trouble is with composite video. Since RF works, we know that the video encoder is outputting a composite signal. I would expect the problem to be in the video amplifier, most likely the transistor as suggested by Bratwurst.

[neojapan]

Thanks everyone for the replies, I tapped into the video encoder directly, Red and Blue, I got green from pin 7 as in this picture:



But it didnt display anything so i just got green from the encoder directly, unfortunately colors show almost black and white, but its showing picture



I'm yet to try and replace Q10, ill try that later, but what you guys think? why are colors showing like this? thanks again

[Pikkon]

For the component mod on first gen snes use this.



I have used it before and it worked great.

[neojapan]

For the component mod on first gen snes use this.



I have used it before and it worked great.

Hi there, I did tried getting green from there but it didnt work so i ended up getting green from the encoder directly and it worked, but almost black and white colors, check my pics above. thanks fo rthe reply

[RP2A03]

why are colors showing like this? thanks again

What you are pulling off the chip isn't red, green, and blue. You are getting luma (the black and white part) which goes to the green jack, blue and luma difference which goes to the blue jack, and red and luma difference which goes to the red jack. For the record, you are not supposed to pull luma from the encoder chip, you are supposed to take it after it has passed through the amplifier. With that said, this doesn't help you fix your problem withcomposite video. What concerns me more is the apparently weak R - Y and B - Y signals. Measure the DC voltage on pins 1 and 24. They should both be about 3 volts.

[Niku-Sama]

little late back to this party but I tapped into all 3 on the board it self and bypassed the a/v out on the back of the system.
I got color, was slightly washed but not nearly as bad as your seeing here.

what board revision and chip number are you tapping into, maybe we can find a work around for not using the multi A/V out

[Mayhem]

Basically, there is an easy way to bypass the entire multi-out, including the on-board video amp on consoles that behave this way. Only seen this behaviour on launch consoles that had the first revision of PPU2, but that could be a coincidence.