a12

[pritsinghs3]

I'm kind of stuck in a weird position. I just completed my first A12 preamp with transformer and sc25 opamp. When I power it up, the LED light on the module doesn't turn on. I'm sure I did everything correctly. My soldering also looks fine. The only thing I can recall doing is sometimes (maybe happened 4 times) I had soldered the wrong thing, and then I had to un-solder it and solder on the right component. Other than that, I KNOW I have the right components on the right part. What can I do?

PS: The ONE and only thing that didn't make sense to me wat item 18, which is the 2 way pin header. For some reason, the bill of materials say J1, J2, J5, J6 but the quantity is ONLY 1!!! Doesn't it mean install it in "either" one of those? I then looked at the high def photos of the module, and there are actually NO J1 and J2 reference points and the J5, and J6 reference points are EMPTY, so I left it empty as well. PLEASE HELP!