Hi guys! New to the forum. Glad to be here!

I been trying to fix my Turbo Express and joined this forum so I can get some professional advice from you guys. Ok, my TE gets no power at all with new batteries or with AC adapter. I did a ton of research so I went ahead and did a few things.

...replaced the 1 AMP fuse and the continuity checks out ok

...replaced the only leaking capacitor I was able to find (the large sound capacitor)

...cleaned all the solder joints with 99% isopropryl alcohol and cleaned all the soldering pads

...cleaned the switch terminals

I watched countless videos on youtube and read many articles on how to repair these things. Many of these places lead me to the 1A fuse which I already replaced. I have prior soldering experience and a minor knowledge in electronics.

Can anyone tell me what did I miss? The system doesn't power on at all. Screen is black as if there are no batteries in it. Please any help would be appreciated.