Hi guys ,
I hope you can help me because I think I have a Famicom with the ppu bad since I took pictures of the changes made. The picture and sound are very good but unfortunately we see black and white yet tried it on multistandard television and I try to bridged to test various points but alas nothing did the color you see for a second nn but remains fixed for nothing ... I also found a diagram of the ppu on nesdev wiki where I noticed that the pin 18 relative to the clock CLK can be of great importance for the solution to my problem:
The site explains the various points
http://wiki.nesdev.com/w/index.php/P...al_descriptionSince I keep a pal nes fault according to you if you use a slot for 40pin chip so as to exchange various ppu can be a solution? The only doubt that the ppu a pal nes could create me problems glitches in various games among jap like castlevania 3. You say that it can depend on that or do I withdraw with other schemes am blessed color?
I know it is very difficult and I hope you can help me ... d the other hand, this is my first edit on a Famicom nn then I was able to make the previous ....
Thank you and see you soon!
Mr. Forever
i report my mod and the schemes that i've tried but without success
other used schemes tried but without succes
I have also had this happen following these instructions exactly. Unfortunately my only solution was to switch to a different television, as only one had any problems with it. See if it happens with another.
Loss of color, with an otherwise-correct video, can mean only two (three) things:
1- the crystal is no longer the correct frequency. Maybe try fussing with the trimmer capacitor?
2- a very strong lowpass is removing the colorburst, and all other color content. But the video should look blurred, then.
3- (your TV is interpreting the input as component or s-video, not composite)
3b: your TV is interpreting the signal as black and white because it's only 341 dots wide, not 341.25 as per the NTSC spec
i tried on two sony triniton multistandard and samsung lcd multistandard same result black/white...
which crystal is on mainboard? i try to trim capacitator (green capacitator on my mainboard) but without reaction from famicom
tepples wrote:
3b: your TV is interpreting the signal as black and white because it's only 341 dots wide, not 341.25 as per the NTSC spec
To test this, if this is the issue, a Super Famicom / Super NES would produce the same issue. Give that a try to see if this is it.
As an alternate test, try disconnecting your circuit from the PPU's video out leg, and put your composite video out on that. You might see a color image that dies very quickly, but it will be a hint.
In your greyscale video, do you see a checkerboard pattern or fringing on the edges of things that should be color? These NTSC artifacts should still be visible.
Hi mike,
Composite video is same of rf video? In rf it should me in black and white...i've more jap console (like playdia, pcengine, etc not modified) and i've tested it on my multistandard tv like sony triniton and i see with full color but with famicom that i've modded the situation is different.
in my greyscale video is evidence that there are color but...i think that some resistance or other doesn't see color...
i'm sorry for my bad english but i hope that you can understand me.
thanks a lot!!
Bye
mik
For the Famicom, the color information should look like a bunch of marching diagonal lines if the TV is refusing to decode it as color. (If you don't see any, are they visible if you instead plug into the TV component luma/green jack / wire it into the S-video luma pin?)
What other pre-gamecube consoles do you have? An Atari 2600 or Sega Master System (or Apple 2, or IBM CGA) have another non-compliant video output: 228 instead of 227.5 master clock cycles. If any of them work, it's unlikely to be the NES's too-short scanline that's to blame.
If your TV has s-video input, what happens if you use a simple composite - to - s-video "converter"? By which I mean, connect composite out to Svideo Luma In, and connect that signal via a 690pF capacitor to Svideo Chroma In?
mrforever wrote:
Hi mike,
Composite video is same of rf video? In rf it should me in black and white...i've more jap console (like playdia, pcengine, etc not modified) and i've tested it on my multistandard tv like sony triniton and i see with full color but with famicom that i've modded the situation is different.
in my greyscale video is evidence that there are color but...i think that some resistance or other doesn't see color...
i'm sorry for my bad english but i hope that you can understand me.
thanks a lot!!
Bye
mik
Here is an example of a monochrome display showing Composite Video without interpreting the color:
Where the ball of the joystick is supposed to be red, it has lines. Famicom will show something similar, but with a moving checkerboard / diagonal line pattern.
It is possible that somehow the greyscale bit is stuck, but it seems wildly unlikely.
That looks like a monochrome monitor or it's only getting the green signal. Since this is not component video, I think that that monitor is set to monochrome mode, or does not even display color.
mikejmoffitt wrote:
Here is an example of a monochrome display showing Composite Video without interpreting the color:
wyatt8740 wrote:
That looks like a monochrome monitor or it's only getting the green signal. Since this is not component video, I think that that monitor is set to monochrome mode, or does not even display color.
Can you not read?
lidnariq wrote:
mikejmoffitt wrote:
Here is an example of a monochrome display showing Composite Video without interpreting the color:
wyatt8740 wrote:
That looks like a monochrome monitor or it's only getting the green signal. Since this is not component video, I think that that monitor is set to monochrome mode, or does not even display color.
Can you not read?
This. Please read first...