Ok!MMM wrote:This is a bit tricky to explain. There *might* be a problem here but since there are so many different things that could go wrong it's not easy to say right now.rememberence wrote:[
Well, i tried the ground-pin (pin20) and i got totally different voltages.
So i tried to see if ground-pin on J4 is the same as pin20 on IC3 (beeping-mode on my multimeter) and i wont get any beeping.
The mainboard has two different grounds: "analog" ground and "digital" ground. The "analog" ground is supplied from J4 (together with the "analog" voltages 5.33v and 12v). The digital ground is supplied from J3 (the ribbon cable) together with the "digital" voltage 5v (and various additional signals). Those two grounds are not connected to each other on the mainboard itself.
HOWEVER:
The grounds are tied together on the IOboard.
So with either J4 or J3 NOT connected you will get no continuity between pin 20 of the processor (or processor socket) and the ground pin of J4. But with both J4 and J3 connected you should definitely get continuity.
Great
Another thing i was thinking about was if i have soldered in the wrong resistor somewhere, would that account for the wrong voltage perhaps? I will doublecheck the resistors just to make sure.