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Looking at the schematic, there is the 1nF, 10uF and 47pF inside the box for the audio. The 1nF is directly after the main board's 10nF that goes to the pin to the box. Could i possibly just add new capacitors on top of the SMD without removing? I have all the non-SMD replacements, but I gotta say m...

ok, here is where I'm gonna be a little lost since I've got no SMD experience and it's a little, nerving to say the least (kinda blind). :P Are these the capacitors we're speaking of here? Or are we discussing the seemingly MUCH EASIER and less scary lol.. what looks like C25 inside the metal box? B...

ah, I hadn't figured that may be the ONLY problem, plus I hadn't gotten the outside box off again until now so it was kinda last resort situation, as it is now, also kinda weird that this problem is in TWO outside boxes. Bummer. At any rate, I have other systems I have to work on and if this outside...

I changed out the outside box, still no audio, so now I'm peeved after all that lol.. damn it.. I'm still getting audio just fine out of the lil setup I did there in the picture above. I dunno what to do, but I'm gonna have to work the outside box setup to be more modular so I can work on it rather ...

I disconnected the outside box's audio pin (pin 4, chip side up), put the inductor back in, in fact I pulled one from one my parts board, just to be sure, I added a new C4, the end point where it would go to the outside box does not produce audio. So this is what I did, I soldered the 39µH inductor ...

Is this the board that you removed the RF modulator from? Yes, I'll check all that now. The RF modulator is reconnected but only because I was having problems, I'll have to desolder it again to get inside box. However it'll be easier this time, I got a nice Hakko desolder gun, no more manual handpu...

Removing the 39µH inductor now produces sound, not only that, it's boosted sound. It sounds normal coming out of pin 10 now. Should I just connect the area from FC1 that is now empty into C4 or is there something else that needs to happen here before we snap this up?

lidnariq wrote:

K_Devel wrote:pin 10 to 5v ground resistance is 4.2

What? Is that the resistance from pin 10 to +5V (pin 14) or to ground (pin 7) ? And what units? kΩ? Ω?

Ω It's 4.2 from pin 10 to ground pin 7

lidnariq wrote:You could also use the multimeter to measure the average voltage at pin 10, or once the machine is off measure resistance from pin 10 to +5V and ground.

voltage at pin 10 is about 0.16 as is pin 11
pin 10 to 5v ground resistance is 4.2

I also verified the 7404 I was working with on the original board with audio issues works, I put the 7404 into the functioning board I swapped chips with and added a ic socket from this morning. Still not sure why there is an issue between these two pins on the board level now. Edit: I have also rep...

WORKING chip is NOT working on the other board, verified. Something is up with the transfer between pin 11 and 10. Just gotta figure out what exactly. If they were somehow connected together by some accident on my behalf, then I assume both pins would play same audio level due to it just not going t...

This is an NES-CPU-05 CPU w/ a NES-CPU-08 PPU, which worked to fix the video. As far as I can tell, the audio, because it's not reaching outside of pin 10 of the 7404 (presumably) that it's not reaching FC1 or C4. The trace from pin 10 on the 7404 goes directly to FC1 then C4. I would *think* that i...

Well the stereo mod is not completely on the table with THIS system yet, I might, I have better boards to muck with. I'm not sure both inverters are dead, the board the 2nd inverter came from is a parts board and is no longer in a capacity that it would be able to test anything on. I could, use my G...

I've got some new HCU 7404's coming, same state as me too, should be here soon. Got something cheap and local. I'm hoping replacement will fix this, under the strange and unlikely case that both of my NES pulled 7404's are dysfunctional at pin 10 to 11. http://www.digchip.com/datasheets/parts/datash...

man, I have two 7404N's. Nothing newer. So you were saying that if I disabled lock out I could then use, or attempt to use the inverter of that function instead. I'm completely boggled right now as to why two chips aren't working, I cannot get a definitive "yup it's broken" other than yup,...