Super famicom voltage drop

I've been trying to fix two Super Famicom consoles that seems to have the same problem.
After replacing D1 in both of them I measure 9v up until the power switch when the switch is set to off.
When I put the switch to on the voltage drop to between 3-4v.

Here's what I've tried to far to debug this issue:
- Remove 7805 = measured 9v at the input solder pad.
- Solder 7805 input and GND leg only = measured 3-4v at the input leg.
- Solder only 7805 input leg = measured 9v at the input leg
- Solder 7805 input and output leg = measured 3-4v at the input leg.

I've also replaced a bunch of capacitors without any luck.

When I'm diode testing with a multimeter from GND to the components L1 and c11 I'm getting a beep in both ends each component, is that normal or does that indicate a short?

This mother board haven't been modded in any way.

Please help me before I'm throwing this out of the window!

 

Replace the 7805 is my first suggestion

 

Oh, I forgot to mention that I've replaced the 7805 with a new one. No luck

I'm getting a new multimeter today cause mine broke the other day (parts fell off, I think I paid like 5 bucks for it) and I'm thinking about reflowing every IC hoping there's a short somewhere.