I have a P1004B746400 B7464 REV.A board which is a 72-pin SIMM RAM with two TI TMS418169DZ chips on it. According to 72-pin SIMM configuration, the pins #1, #39 and #72 are ground Vss and pin #10 is supply Vcc.
However, those ground and supply pins are connected to no where, I mean, there is no trace on the board connecting to those pins. Now, I wonder what I'm missing and how the ground and supply pins work.
Pins #1 and #72 are shown below which have no trace connecting to them.