Good morning folks,
I'm in need of some help. I recently had to do some work to fix my front-loading nes that I have had and played for decades (not an ebay find). The work wasn't anything major, I just had to replace the pin connector because of broken pins, as well as the capacitors on the power board as they had leaked. Easy enough. The system loads great, games work great, the only problem is the colors are off. The system does display colors, but it looks like it is missing the red component, or it is very dim. You do get red, but it's harder to see and its kinda brownish. The black and white looks fine, so does green is kinda dim, and blue is dim. Static images like title screens look clear on both RF and composite. The screen gets a little noisy around objects when you have a moving image, like mario running.
I have measured the incoming voltage after the rectifier, and its sitting around 10.5v, and the 5v rail is around 5.25. The signal output peak to peak is around 1.2v which is a smidge high from what I have read. Signal waveform looks clear for the most part, not sure what exactly I would be looking for, but it seems to have the basics from what I have found on Youtube.
I know the system calls for 9-10v. Could that extra 1.5v be bumping stuff up to high and causing incorrect colors in the signal? I saw somewhere that the croma portion of the signal is more sensitive to changes in sync
Could the higher voltage mess with the ppu clock to where its not quite in sync on chroma? If so, what are the frequencies I should try to obtain, and is the clock adjustable with the little potentiometer right next to it?
This is just me spitballing, been at this a couple weeks and can't figure it out. Any ideas would be helpful.
I'm in need of some help. I recently had to do some work to fix my front-loading nes that I have had and played for decades (not an ebay find). The work wasn't anything major, I just had to replace the pin connector because of broken pins, as well as the capacitors on the power board as they had leaked. Easy enough. The system loads great, games work great, the only problem is the colors are off. The system does display colors, but it looks like it is missing the red component, or it is very dim. You do get red, but it's harder to see and its kinda brownish. The black and white looks fine, so does green is kinda dim, and blue is dim. Static images like title screens look clear on both RF and composite. The screen gets a little noisy around objects when you have a moving image, like mario running.
I have measured the incoming voltage after the rectifier, and its sitting around 10.5v, and the 5v rail is around 5.25. The signal output peak to peak is around 1.2v which is a smidge high from what I have read. Signal waveform looks clear for the most part, not sure what exactly I would be looking for, but it seems to have the basics from what I have found on Youtube.
I know the system calls for 9-10v. Could that extra 1.5v be bumping stuff up to high and causing incorrect colors in the signal? I saw somewhere that the croma portion of the signal is more sensitive to changes in sync
Could the higher voltage mess with the ppu clock to where its not quite in sync on chroma? If so, what are the frequencies I should try to obtain, and is the clock adjustable with the little potentiometer right next to it?
This is just me spitballing, been at this a couple weeks and can't figure it out. Any ideas would be helpful.
Statistics: Posted by PyroProfessor — Thu Jan 18, 2024 8:45 am — Replies 0 — Views 55