So, this is my first project beyond wiring up cables and I didn't do as good a job as I thought desoldering the PPU.. looks like 5 pads pulled out when i removed the chip. From the traces it looks like only two are going to give me trouble... The three Red points don't appear to go anywhere but am I correct in assuming I just need to run a wire along the two orange points to make everything "work" or have I just created a new paperweight?
hahahaa..no...you can fix it..and next time take your time!if i was you i would run a wire as you pointed out and touch up the other pads.
I have a NES-CPU-11 revision board with the PPU desoldered in front of me. It appears you only need to jump the wires on the orange points that you marked. All the red points you marked have the traces on the back. Assuming all those annular rings are intact on the back side and you could still solder on the chip socket, I think your board should still be okay.
So I got around to "finishing" this install and I have bad connections somewhere. I need to get back into it and see where I'm getting fault. With the snes connector out I am getting extremely spotty connection and the picture on the rare times it shows is all jumbled. I plugged in the original cable in the back and loaded up Zelda, the colors were completely washed out the screen shows everything but it is all in shade of white and grey no black. EDIT: Updating video, turns out I am extra special and when I sat down I bumped the CH. selector and that's why old video was showing such poor quality.
Well then, perhaps my output wiring just sucks. I have the output from the RGBNES going into Helder's printed SNES output. I am testing with Retro_Console_accessories ntcs snes cable (which works with the snes) is that incorrect? should it be setup differently or have i just wired it wrong?
I see you have RGB moded an NES front loader with A/V out; I noticed the recommended cable for the NESRGB modded Famicom AV - is a Gamecube SCART cable or to modify the SNES SCART cable by removing the 75 ohm resistors. It makes mention that a SNES SCART cable will not work with the NESRGB mod. Bottom page of this link: Guide for installing an NESRGB into a Famicom AV
Venatus Usque I swear you are an amazing hyper helpful stalker, you keep popping up in my threads giving great advice. Cheers to you mate. So everything is working! When I purchased the SNES cables I got two one for the NES so I popped open the cover and removed the 75 ohm resistors and tested, no good so I went back and looked at my output soldering and I have to say.. my ability to mix pins is astounding. I somehow wired the Blue output into pin 9 (composite video) and I had the composite video wired into pin 3 (c-sync). gold star to me! but when I finally went back and fixed those along with your cable advice it is all working.
for your experience, which method do you suggest to desolder the ppu? I'm quite good at solderin' but no experience in desolderin....I would try the rgb mod but I'm scared
I tried to soak up the solder from the ppu side of the board with solder wick with extremely limited success. What ended up working for me was to clamp the board vertically and come at the bottom side with solder sucker, and top (PPU side) with the iron, heating all the way through and sucking out bottom. This cleared the holes well, but as you can see from my first picture I didn't have some of the holes as clear as they should have been when I tried to remove the chip. That said if I do this mod again, I will desolder the same way just take some extra time to make sure all the pins are really really free before I start pulling. This was my first major project and I was really nervous as I worked it and was quite convinced I completely destroyed the board at one point, but it all worked out in the end. Patience and double checking wiring diagrams are key lessons I took from this.
I used an actual desoldering station when I did NESRGB mods, it usually got the PPU out in a couple of minutes.
Glad to see that its all working now ... quite a noticeable difference between RGB and Composite - thanks for sharing. Are you going to box your scaler or try to mod it into that extra NES case you mentioned early on. That would look cool. For any future desoldering projects; I recommend and use this: Desoldering Iron It works great and its inexpensive...
I have been thinking about how I want to do it and I think I know what I'm going to do, need to scrounge up a bit of scrap plastic for it. But I'm definitely going to do it.
