Question, I have a SD50 ps2 3v that I was told had a bad stacker board. I am assuming that is the top board. Now I have a parts unit that’s identical. Can I just swap the top board? Just unplug everything and put the good board back on? This is out of my wheelhouse, so any info would be appreciated.
Now on second thought, not knowing what made the board go bad, changing the board just could ruin a second board, still would like to know if it could be done.
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First off, it really is important how the person that "diagnosed" the failure determined that it was the top board that was bad. Since the top board is really just level shifters and the like, all the real logic is on the main bottom board.
If you were sure that the top board was the only failure the answer is YES, you can just put a matching top board on the processor board.
John, actually the accuracy of the testing that was done was in the back of my mind. Not knowing a 100% for sure, I decided to go a different route.
It was at the forefront of my mind, an inaccurate diagnosis can cost you a lot of time and money. 
You say PS-2 3V and then say stacker. PS-2 3V do no have stacker boards. PS-2 3V have a processor board and the top Power Supply board. Get a tech who know how to diagnosis PS-2 3V boards to test it. G
That just shows you how much I know about the internals. Thanks for the info G
@GGG posted:You say PS-2 3V and then say stacker. PS-2 3V do no have stacker boards. PS-2 3V have a processor board and the top Power Supply board. Get a tech who know how to diagnosis PS-2 3V boards to test it. G
Nice catch George, that slipped by me, I saw "stacker" and assumed the PS32 board. 
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