the image that comes out is black and white, distorted and jumpy.
Cyrus331 opened this issue · comments
Hello, I grafted this module to the RGB output terminal of PCENGINE. The crystal oscillator has been changed to NTSC and the jumper has been connected to NTSC, but the image that comes out is black and white, distorted and jumpy. I don’t know what the problem is.
It is normal for RGB signals to be output to the TV
It's very hard to say. First of all it seems that you have redesigned the board in a different software package and you could have made errors in that. Please double check that the schematics match perfectly.
Apart from that, if you have bought your AD724 chips from China, they might be bad, I know that are batches around that do not let the crystal start to oscillate properly (or maybe they need a particular crystal, I really don't know, sometimes just touching the crystal makes it work correctly.
Also make sure you have a 10/100 uF cap on the power lines (C6/7 on my board).
I don't know what else to suggest, I guarantee that my original board works correctly and I know that other people have derived working designs from it.