No Screen (Sega NAOMI 2)

no screen can be caused by many things, but below are some common causes bios if the bios is bad or missing, the system cannot load anything and so you get no video output at all power rails bad power rails or slow bring up from one, or lack of current, can all cause black screen power vr fans if the power vr2 (ic15, ic110) are jammed, faulty or disconnected, the system will not boot, and it will give black screen the system continues to monitor for the fans to work again then resets the system once they are ok sega 315 6289 the custom sega 315 6289 processor (ic105) is required to be fully working, along with its ram (ic106 to 112), in order to get at least black screen if any part of this process or ram is shorted, faulty, or missing you will not get to black screen hitachi sh 4 cpu the core cpu hitachi sh 4 (ic1) must be fully working, along with its ram (ic9 to 12), in order to get at least black screen if any part of this process or ram is shorted, faulty, or missing you will not get to black screen