NESRGB problem

treqie · Post by **treqie** » Fri May 01, 2015 1:51 pm

Hello. I've been trying to install nesrgb on my front loader pal nes.

The problem is that I don't get any video. The tv recieves a signal, but it's all black. And I can hear audio, although it's a loud buzzing sound coming as well (how do you fix that?)
Just before I wrote this, I tried switching the "composite video encoded from RGB" to "original PPU video", and there I could see a faint picture. But blurred and very dark.

I'm not an expert at soldering, but I know enough to make it work at least.
Where do you suggest I start checking?

Edit: Oh, and I am using a multiout from a super famicom.

Hoagtech · Post by **Hoagtech** » Fri May 01, 2015 3:44 pm

I wish I could help but if you give up. There is a guy in Canada from nes reproductions dot com. If you ship it to him he will fix it with your amp you bought. It won't be free but he does good work and did mine.

I would check your solder and make sure it is not bridging onto any globs. If that didn't work I would wick my solder and restart from the beginning

treqie · Post by **treqie** » Fri May 01, 2015 3:58 pm

What I was wondering is, what could make the picture black in rgb, and have some very blurry and dark picture with composite. Is there something particular I could narrow it down to?
I was thinking that if I manage to fix the picture in composite, that may somewhat solve the problem with rgb as well.

Sixfortyfive · Post by **Sixfortyfive** » Sat May 02, 2015 6:31 am

Does S-video work?
Does your RGB cable use composite video for sync or a different kind of sync?

treqie · Post by **treqie** » Sat May 02, 2015 10:31 am

Does S-video work?
Does your RGB cable use composite video for sync or a different kind of sync?

So far I have only tried with the multiout. I use female-female cables from the board to the multiout.
I'm gonna try and solder the cables to the muliout, just to be sure that the cables really get a connection.

and yeah I've plugged in composite sync. No picture at all. But the tv does recieve a signal, but it stays black. I only get a picture when I change to "original PPU video", but it so dark and blurry that you can't see anything almost.

treqie · Post by **treqie** » Sun May 03, 2015 1:03 pm

Ok, so before that, I put the PPU back in its original place, without NESRGB. And things looks as it should, so there's no solder points on the motherboard that got messed up while taking out the PPU in the first place. So that's a good sign, and confirms that it's something I've done wrong in installing it.

ELabit · Post by **ELabit** » Sun May 03, 2015 1:27 pm

post pics. Did you solder the region jumper? What do you have wired up for sync? Wire both the composite vid and composite sync lines to their correct pins. Double check all your solder joints to make sure nothing is bridged. Could be a lot of things. If you have a SNES composite cable try that to see if you get a pic

treqie · Post by **treqie** » Wed May 06, 2015 6:21 pm

post pics. Did you solder the region jumper? What do you have wired up for sync? Wire both the composite vid and composite sync lines to their correct pins. Double check all your solder joints to make sure nothing is bridged. Could be a lot of things. If you have a SNES composite cable try that to see if you get a pic

- Solder jumpers are soldered.
- I have used pin composite sync to pin 3 on the multiout.
- I wired every pin on the row there, except pin 12, right audio.
- I think I've looked 10 times now on all the solders, and resoldered. But apparently my eyes aren't good enough.

And today I tried Luma, Chroma and ground to the svideo-contact. I thought maybe the multiout was defect.. but no video there either.

Also, when I've tested this. I've used the rgb scart cable from my gamecube. Then I tried a third party cable with rgb, and thirdly a non-rgb scart cable.

Pics: http://imgur.com/a/kXAVj

vvs · Post by **vvs** » Wed May 06, 2015 8:12 pm

You don't appear to have one of the palette pads shorted to ground. You must have one selected to get RGB video output

http://etim.net.au/nesrgb/NESRGB-Pinout.pdf

treqie · Post by **treqie** » Wed May 06, 2015 8:59 pm

You don't appear to have one of the palette pads shorted to ground. You must have one selected to get RGB video output

Wait, what.. you mean that palette switch? I thought that was something optional, if you wanted to change the colors. Jesus christ, can that be what gave me all this head ache?

ApolloBoy · Post by **ApolloBoy** » Wed May 06, 2015 11:45 pm

treqie wrote:
You don't appear to have one of the palette pads shorted to ground. You must have one selected to get RGB video output
Wait, what.. you mean that palette switch? I thought that was something optional, if you wanted to change the colors. Jesus christ, can that be what gave me all this head ache?

Yeah, if you don't have a palette selected you'll get a black screen except through PPUV.

treqie · Post by **treqie** » Thu May 07, 2015 5:53 pm

Ok. This is today's progress.
I've soldered on the palette switch.

I tried several times with the multiout, but I'm beginning to think that's broken or something. I can't seem to get any picture at all.
So then I tried with the svideo contact again. If I set the switch to the middle setting, which I assume is "off", then it's black. But at either of the side positions, I get a picture. But it's all scrambled and distorted. Kind of looks like when your amiga or c64 is decompressing something.

Picture: http://imgur.com/PzwjtSz

mvsfan · Post by **mvsfan** » Fri May 08, 2015 1:58 am

the solder on the second voltage regulator and on the original regulator looks like its bridged together.

treqie · Post by **treqie** » Fri May 08, 2015 9:03 am

Ah, it only looks like it is. And I've made that soldering a bit better.

mvsfan · Post by **mvsfan** » Fri May 08, 2015 3:38 pm

i notice your using a flat screen. are you sure it can accept 240p?

treqie · Post by **treqie** » Fri May 08, 2015 10:14 pm

Yes of course, I've used unaltered nes, snes, and amiga on it. All with low resolution.

Skips · Post by **Skips** » Sat May 09, 2015 5:40 am

treqie wrote:Yes of course, I've used unaltered nes, snes, and amiga on it. All with low resolution.

Remove the palette switch and any jumpers so its all open (putting the kit in its off state) and see if the NES still functions in stock mode via the stock composite video port. If not you borked the kit or the PPU or possibly lifted solder pads and or traces.

treqie · Post by **treqie** » Sat May 09, 2015 2:12 pm

Remove the palette switch and any jumpers so its all open (putting the kit in its off state) and see if the NES still functions in stock mode via the stock composite video port. If not you borked the kit or the PPU or possibly lifted solder pads and or traces.

Ok. I've checked it out.
First, this is what I did; I removed all the cables for video and audio, removed the cables to the switch. And just had the nesrgb board, with the PPU. The voltage regulator was still soldered in place.
And then I plugged the composite cable into the original video port.
Picture: http://imgur.com/TBFWBjl,yy8WHu1

Then I removed the nesrgb board, and put the PPU back in its original place.
Picture: http://imgur.com/TBFWBjl,yy8WHu1#1

So.. the conclusion is that I somehow broke the nesrgb?

treqie · Post by **treqie** » Sun May 10, 2015 12:15 pm

Just for the fun of it, I tried using the svideo port again.
Picture: http://imgur.com/27FbxFs

The games boot and all that, but it still doesn't look alright. And like I wrote before, if I put the switch in the middle mode, it's black. Either side, it looks like that.
It looks different than before though.

shmups.system11.org

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