Famiclone bad 7805 replaced but Still not working voltage drops with switch on.

[Nesmaniac]

I have a famiclone that had a bad 7805. I replaced it (twice actually) and multimeter reads 13.7 volts in and anywhere from 4.94 to 5.07 volts out. When I check the voltage at the switch with switch off it reads the same as the voltage out on the 7805 but when I flip it on it drops to sometimes half the voltage and sometimes even 1 volt or a bit under. I've already replaced a few caps that the 5 volts first enter and testing with multimeter shows 0 volts past the cap s which is why I replaced the 2 closest to the regulator. I finally got power at the switch which is wired all the way to the front of this famiclone board. I'd get the same voltage reading as the 7805 was outputting but when I flipped switch on the voltage would drop to half or even down under 1 volt sometimes. I've taken switch apart and cleaned it with metal glo polishing it up like new and checked over and over and with it off the regulators 4.94 output for example would be exactly that at switch post until I flipped it on then both post on the switch our read the half or less reading. Common sense tells me something is soaking up the volts so I'm curious as to what it might be? I have a Spelunker cart that has the red LED which lights up which does light now after replacing the regulator when I turn the switch on but I don't know how it can light because I would think it would require 5 volts to light. This has be totally confused. Also, the bottom of the clone (it looks just like a famicom) says AC 4W which has me puzzled because DC is what original famicom uses but I see no bridge rectifier but at any rate I don't think it matters since I'm using a model 1 genesis power adapter and as with the NES using DC adapter is fine just don't use AC on a DC circuit I know that much. Any help would be greatly appreciated here I spent much time yesterday trying to get it going but am by no means an electronics expert. I feel it's something super simple.

[VegaVegas]

Do you have any clue what happened to the famiclone before the bad 7805?? My guess is that the switch might be old, high resistance maybe etc. Can you exchange it for a moment using another brand new switch?? Anyway, I fear you should examine the entire famiclone PCB for bad caps or resistors or chips and evaluate which parts are working and which arent

[Nesmaniac]

Do you have any clue what happened to the famiclone before the bad 7805?? My guess is that the switch might be old, high resistance maybe etc. Can you exchange it for a moment using another brand new switch?? Anyway, I fear you should examine the entire famiclone PCB for bad caps or resistors or chips and evaluate which parts are working and which arent

Unfortunately I don't since I bought it on ebay as not working. I do not see anything or smell anything wrong though board and components look new. Switch I took apart and cleaned with metal polish. I think I'm going to run a wire from the 5 volt 7805 down to the switch solder pad feeding it 5 volts & go from there. The same low voltage is showing up on all the chips corner 5v in pins as well so something is soaking up 2-4 volts once switch is on. Could the 7805 be bad & when I turn the switch on the load is too much for it to push out 5v? I've replaced 2 already thinking the other was bad when it was showing low output voltage until I realized only when switch was on. Sure has me confused.

[krzy]

Just some of the chips in console are broken and when you turn the switch, they source so higch current that the overcurrent protection in 7805 drops the voltage.
Check which of chips gets non naturally hot.

[Nesmaniac]

Just some of the chips in console are broken and when you turn the switch, they source so higch current that the overcurrent protection in 7805 drops the voltage.
Check which of chips gets non naturally hot.

I actually did check to see if something was getting hot from chips to other components because I figured something has to be soaking up that energy but no chips are getting hot. The 7805 is getting crazy hot fast. I've not taken the RF shield cover off so I'm wondering if it might be something in there like a blow cap or something. I guess that will be the next thing I check.