for charlie

Woodmaster recently posted these NEO2.2 pinouts that may be helpful to your installer:

There are two ways to install the neo2.2, a 5 wire install which doesn't support the ea boot method and the 8 wire install. If you have the 8 wire install and the tray wont open after holding reset for 10 seconds then the install is dodgy. Like charlie stated pins 5 and 6 crucial. here's what each pin controls
PIN #1 = supplies + (power) to the chip
PIN #2 = sends SCE signal out to PS 2
PIN #3 = PS 2 drive tray pulse tells the BA5810FP chip whether to expect a drive tray open or close
PIN #4 = checks/signals RESET button on the PS 2
PIN #5 = closes PS 2 drive tray
PIN #6 = opens PS 2 drive tray
PIN #7 = checks if game CD is PSX/PS 2 (If PS 2, immediately stops SCE signal & restarts when a "tray close" is seen. If PSX, it stops after about 15-20 seconds)
PIN #8 = supplies ground to the chip