Circular screen on custom board doesn't work

[cpat]

Hello,
I made a custom board based on the gameduino design.
As I run selftest, the serial reports a working FT810 chip.
Despite the backlight working, the screen is black when I run "testfizz" or any other example.
I checked every single screen pin with the oscilloscope, the data seems to be correct.
Here is my screen datasheet

Is my register config correct ? I mean can a bad configuration the origin of my problem ? Even if it's wrong I expect something weird displaying but nothing ?

GD.wr32(REG_HCYCLE, 500);

GD.wr32(REG_HOFFSET, 70);

GD.wr32(REG_HSIZE, 480);

GD.wr32(REG_HSYNC0, 0);

GD.wr32(REG_HSYNC1, 10);

GD.wr32(REG_VCYCLE, 500);

GD.wr32(REG_VOFFSET, 13);

GD.wr32(REG_VSIZE, 480);

GD.wr32(REG_VSYNC0, 0);

GD.wr32(REG_VSYNC1, 2);

GD.wr32(REG_DITHER, 0);

GD.wr32(REG_PCLK_POL, 0);

GD.wr32(REG_PCLK, 8);
Can anyone suggest a debugging procedure ?
Thank you

[dev255]

Hi, there isn't much activity on this forum, hopefully everyone is ok staff wise for the Dazzler. I have posted 3 times since September and had no response, so don't visit here much (watch out for tumbleweed).

I have a project to show my CNC status on an HDMI monitor in portrait mode, all is working ok now although the Gameduino does not work on most TV's and on older HDMI monitors, plus my projector. So it may be that the Gameduino is waiting for something from the monitor. I hope that helps.

Kind regards,

Neil.