I have a Mindstorm NXT 2.0 from 2007 (PCB code: 62115.40H) at which the sensors except the simple "Touch sensor" are no longer working. Also the tacho-signal of the motors do no longer work. (The motors work but do not stop after e.g. 5 rotations)
By looking at the schematics of the slightly older NXT (1.0) I could figure out that the problem seems to be caused by a defect in the 4.3V output supply. So I opened the housing and measured at TP79 of my NXT 2.0 the voltage of IPOWERA, IPOWERB, IPOWERC, IPOWERD and POWERMA, POWERMA, POWERMC. The voltage was not having 4.3V while the 5V supply "VCC_RS485" from which the 4.3V output supply is generated was fine.
My problem: The circuit which generates the 4.3V output supply from VCC_RS485 was changed in the NXT-2.0, while I can only find the schematics of the older NXT (1.0). This made it for me impossible to find the defective component (since nothing looks obviously defective)
Does anybody know how to fix the 4.3V output supply of an NXT-2.0?
Or does anybody know where to find the schematics of the NXT-2.0?