Nes mobo/screen voltage values

[Andypoilop]

I'm trying to troubleshoot my portable NES. I have determined that the screen is working fine. The 7805 regulator that I placed on the motherboard spits out 5 volts just fine. Now I am unsure about what voltages should be spit out after that, such as from the motherboards video out, video out to screen, etc. Is there a nice diagram with these values or any sort of reference I can use for this? Also I don't claim that my controller circuits are perfect, but I feel like knowing these types of values would aid me in troubleshooting.

[markus]

Umm did you check the stickys? Well im pretty sure the screen gets 5 volts.

[Kyo]

psone screen? That needs more than 5V. More like 7.2 - 8.3V