Famicom GPM-02 Problem

[Skips]

Sorry if this is the wrong section for this.

I had bought a GPM-02 Famicom and it worked when I first got it but about 10 minutes after testing to make sure it was working it just stopped. I took it apart and tested the Famicom PCB to see if it was getting 5 volts however it was fluctuating between .25 and .5 volts. I figured this is probably just the power regulator so I removed the RF box and fed the pcb a straight 5 volts DC (I plan to RGB mod it and had to remove the RF box anyway). I got the same result by using a 5 volt PSU. Next I tested the voltage at the power jack with the system off and it reads a perfect and steady 5 volts. If you turn the system on it drops down to .25 - .5 volts, even at the power jack. I have tried multiple 5 volt PSU's and all have met the same results (I know they are working).

The problem has been isolated to something on the Famicom PCB itself. The only part I know for sure is 100% working is the PPU, I desoldered it and tried it in another system after this problem occurred. I also discovered that the original PSU I had tested with before removing the RF box was faulty so I am pretty sure that is what caused the problem. Has anyone experienced this issue with the old Famicom?

[ApolloBoy]

Perhaps it's the power switch?

[Skips]

Perhaps it's the power switch?

Feeding 5v straight into it without the power switch does the same thing. I am thinking my next step is to begin replacing the IC's one at a time and see if one of those fixes my problem.

**Update** I removed all the other IC's and power now gets to the pcb. Going to replace them and see if that gets it going.