Please verify whether graphictest_kbv sketch works.
- readReg() will fail. you are write-only
- readID() will fail. you are write-only. It will always return 0xD3D3
- Software Scroll will fail because readPixel(), readGRAM() will fail. you are write-only.
Colours, Lines, Shapes, Rotations, Text, Vertical Scroll, Band Scroll, should all work perfectly.
There is no point in investigating Touch until the screen is displaying properly.
David.