DUO-RX RGB mod not working

[mickcris]

that doesn't sound good.  if composite video isn't working, that should have nothing to do with the rgb amp.  so if something did get fried, its most likely not the amp board.

[SegaSonic91]

Yup, the fact that composhite did not work freaked me the hell out.  There is a "feedback" like whine that goes from high to low when I turn the system on.  That makes me think it could be the DIN8?  I put some extra solder on to make sure they were all connected.  On the two front pins, the solder seems to sink down rather than forming a blob like the other pins.  I removed all of the wires from the chip/amp, but there is still nothing.  The chip appears to be ok apart from pin 51 which looks like the front of the leg could be missing...  I was hoping that the fact I am taking green directly from the rest of the leg means that it will be fine.  I took some photos but I am unable to upload directly because I cannot resize them to reduce their size.  I will try and remember my account on one of those photo sites and link to them from here.

[MNKyDeth]

I really like http://postimg.org/ for hosting pics.

[NightWolve]

I really like https://postimages.org/ for hosting pics.

Me too, I hope it lasts and I didn't make a mistake in switching most of my stuff to it.

[SegaSonic91]

Thanks for the suggestion!  I uploaded some photos there but am unable to copy the links to the photos on my crappy mobile.  I will do it on my sister's computer tomorrow.  I will also get the solid core kynar and flux pen tomorrow.  I just I wish I knew what the hell has happened and how to fix it!

EDIT: Some shameful photos...

http://postimg.org/gallery/iqpjzc34/

Just one stupid question, does the SCART cable output composite as well as RGB?  I only have the SCART cable to test with as I forgot to grab the DUO-RX a/v cable.  As I said, probably a stupid question but I thought I'd ask.

[MNKyDeth]

Well the first pic it looks like pin 50 is pushed over on pin 49.

The pick with the red/gree/blue and black wire you can clearly see the pins are bridged with the wires and some extra solder by the black wire.

If you replace the standard 5pin Din with an 8pin din all you are doing is adding the red green and blue wires to it. You are essentially using composite sync from pin 1 then and this allows you to use an RGB cable or the original cable still.

I usually pull my ground from pin 3 on the A/V connector under the PCB. And the 5v from pin 4 there as well for the amp.

http://www.gamesx.com/avpinouts/duoav.htm

[SegaSonic91]

Yeah, I was just taking a look at the chip and I noticed that the 50 pin looks like it is crossed over.  I am unsure if it is just solder or if it is the pin.  *sigh*  I really f'ed this up.  I am no expert at soldering, I've only been doing it for a short time.  But!  I have re-capped M-CD1 systems, modded MEGADRIVEs for composite and region free, added region free BIOS chips to MCD1 systems and added a mod chip to two of my Saturns so that I can use copies of my games.  Also fixed 5 TWIN FAMICOMs, but that was just the stupid disk drive. 

I don't understand how I messed this up so badly, I was being so slow and careful and barely touched the pins with the soldering iron for fear of ruining them.  If I fix the bridge, do you think it will work again or have I destroyed it?  I am about to go and buy the new wires etc to re-do it all.  I know that the DIN8 just adds the RGB pins, I was just unsure if the SCART cable was wired for composhite or not.

[mickcris]

The scart cable is wired to use composite video for sync. So it should work for composite video I think. I'm not really sure how that works on tvs as we don't have scart on them here.

Be careful with that lifted pin (50) that you don't break it off. Not sure if you ripped it off the pad or not. You may need to reconnect it to 5v if it won't stick back to the pad.  You're gonna want to check it with a meter.
Hopefully it's not messed up beyond repair. Don't think you'll know till you get it connected good. It might not be working cause of pin 50 not being connected to 5v at the moment.

Edit:
Pin 50 looks ok in the pic with the wires attached but it looks like it was bridged to 49. Probably ripped off when the wire was removed.

[SegaSonic91]

Ugh, I missed getting my new wire and flux pen AGAIN, today.  I keep forgetting that I am in Hicksville at the moment.  I'm buying it tomorrow without fail.  I will just say about pin 50, I am not sure if it is lifted, or not.  It looks like it is in the photo I uploaded, but in the other photos I took, it looks normal.  It's hard to tell looking at it, too.  Guess I'll work it out tomorrow night :/

Edit:  Well, I got the new wire and flux pen.  It looks like every pad from where I previously soldered, is missing.  Not happy.  I soldered everything again and I this time I had sound, but no picture.  I switched the TV to CVBS and still had sound only.  I switched to the non-RGB SCART socket and saw the wonderful sight of the Super CD-ROM2 screen.  So composhit is working, but I only get sound and no picture on RGB.  I am just relieved that I did not f*ck the system!  There was still some pins that looked like they may be bridged, but no matter how many times I tried to drag it off with the help of flux, it just stayed where it was.  I am leaving it the hell alone for tonight!  I am wondering if it could be the RGB pins or something else?  I took the advice and soldered the GND and +5v from the A/V port.

[mickcris]

Glad your system is still working!

I guess its possible that the amp may have been damaged from the previous install.  I would wait till you have access to a meter and double check that everything is connected properly and you have no shorts.

[SegaSonic91]

Thanks!  I was relieved to say the least.  I am going to try a different amp tomorrow and hope for the best.  I am worried about it being something to do with the DIN8.  The "G" pin is kind loose, but I figured that if it was just the green pin, the other colours would still come through.  I will just have to test it with another amp.  If I killed the amp, I may need to buy a couple more, if you still have them!

[mickcris]

It would still working and just green would be missing.  Probably not the din connector. You should secure that loose connection though.

[SegaSonic91]

One thing I forgot to add to my last post, when I plugged the SCART plug into the non-RGB socket, I changed from CVBS to YC and it worked.  Should it give an s-video output?  The colour of the picture changed, so it definitely changed from composite to svhs.  Haven't had a chance to wire up to a different amp yet, I'm wondering how to get the current one out if it IS dead.  That tape is bloody strong!

[mickcris]

It should come loose if you dig under it with your fingernail and pull up.

it does not have svideo output.  svideo shares some pins with rgb so thats probably why it gave a picture:
http://pinouts.ru/VideoCables/scart_adapter_pinout.shtml
http://pinouts.ru/Home/Scart_pinout.shtml

chroma shares the red pin.  did the picture get more red?

[SegaSonic91]

The colour became a bit deeper and not as washed out as composite.  Very strange!

I had another go at the mod tonight and now I am almost certain that the DIN8 has something to do with the problems I've had.  When plugging the system in tonight, the composite picture was awful and then in RGB mode, I had RED!  Nothing but red, but hey, it's better than a black screen.  What makes me think that the DIN8 is at fault, is that when the system was on, if I moved the cable at the DIN, the power went off and on again.  I reflowed the solder on the DIN and did not touch anything else.  When I tried the system again after that, I had nothing, again.  No black screen, nothing at all.  I desoldered the DIN and tried soldering it in again, but it made no difference.  I'm stumped.  I can't buy another DIN8 like the one I have now to test it, either.  I think I can get one that does not solder in, but I would much rather have a solder in DIN.