DUO-RX RGB mod not working

[mickcris]

make sure you dont have too much solder on the pins on the bottom of the board so they are shorted to each other.  its also possible one of the pads could have become detached from the trace when the old DIN port was removed.  You should check for continuity.  I dont really see how the DIN jack could become damaged.  Most likely if there is an issue, it would be shorted pins or pins barely making a connection.

[SegaSonic91]

I am really ready to just give up on this thing.  I am stumped and have no clue what the problem is.  If I turn the system on without the SCART cable plugged in, it works fine, but as soon as I plug the cable in, the power cuts.  When I put the cable in and the power stayed on, there is still no RGB picture (still a black screen) and now composite is messed up with missing colours and things.  The SCD BIOS screen has half the picture missing.  That worries me more than anything.

I de-soldered the DIN8 again and installed it with less solder but it made no difference.  At the moment, it is de-soldered again and I am thinking of putting the original back in to see what happens.

[mickcris]

have you verified all your solder points are not shorted with a meter?  If you haven't, you should stop until you have one.  Hopefully no permanent damage has happened.

[SegaSonic91]

Yeah, I did check with my multi-metre and it did not indicate a short.  I think the battery is just about dead though, so I am going to get a new battery before I put the DIN8 in again.  I really appreciate you taking the time to constantly answer my annoying questions.  You probably wish you had never sold to me!  I do really appreciate it though, so thank you.

I pulled the pins out of the DIN8 because I thought that perhaps some solder had bridged one of the RGB pins to one of the other pins but it seemed to be OK.

[mickcris]

Its no problem.   just wanting you to get it working.

[SegaSonic91]

Thank you very much 

I did solve the problem of the power cutting out or not working at all.  It was the goddammned power chord!  The part of the cable that plugs into the system is apparently a bit dodgy.  MAN I wish I had known that a week ago!!  I did finally get a picture with RGB, but it looked like only green was working.  If I moved the cable, for some reason it then turned blue.  When I plugged it into the non-RGB socket, it was all red.  I think pins 48 and 49 are bridged.  I just cannot get the solder to move off the pins.  I was going to try some de-solder braid.  Is that safe?

I know one thing, I'll never ever make all of these mistakes again when I do the DUO and IFU!  Not a good way to "learn from mistakes though 

[mickcris]

Braid is. fine.  On the ifu at least you solder to the expansion port pins which will be easier.  Glad you're getting closer to it working.

[SegaSonic91]

The IFU should be dead easy.  I really wanted to do it first, before attempting the RX.  Only reason I chose the RX to do first is because there is no issue with putting the DIN8 in the RX compared to making a hole in the casing of the IFU.  I want to make sure I have the tools to make it as neat as possible. 

That and the fact that I cannot find the PSU from my original IFU system I bought in '96 and have nothing that fits the system.  I am glad I didn't buy a shitty HK PSU for it like I did the RX.  It seems that it already needs replacing and I shall be looking for a higher quality replacement.  Hopefully the chord will be more than 20cms like the current one I have.  Cheap Chinese shit.

[mickcris]

the mod for the IFU isnt documented many places so this may help:
http://www.obsolete-tears.com/forum/viewtopic.php?f=8&t=7231

its not in English but has pictures.  you also probably want to ignore the DIN pinout they used and wire it up as the pc engine pinout.  it can be a little tricky since the pins on the expansion port are in the opposite place as the console.

[SegaSonic91]

That's excellent, thank you.  I plan on doing the IFU when I go home today.  I still need to buy a PSU though.  I am thinking that I will just look for a plug adapter for one of my MD PSU's for the moment.

Also, when I re-did the mod again yesterday, I noticed another stuff up by myself.  I had 49, 51 and 53 hooked up!  If I had put the wires on the correct pins in the first place, I bet it could have worked first try.  The pins in the chip are so damn fragile that I am afraid they will break off if I have to remove the damn wires again.  When I removed the the wire from pin 49 yesterday, the damn thing lifted up!  I did not even pull on the wire.  I really need to find some better wire.  I ended up going back to the threaded wire yesterday because the "solid core" wire (I asked for single core) is far too hard to use.  It is so damn stiff!  The proper kynar wire is not.  Once I am home, I can go to my usual Jaycar store and get the wire I need.

[SegaSonic91]

I think I have killed my precious DUO-RX    Several pins on the C6260 seem to have been either fried or disconnected from the PCB.  I am getting severely messed up colour and missing bits of information.  I used desolder braid to remove the solder off the pins, but it did not help.  I tried to re-connect the pins to the PCB in front of the chip by dragging tiny bits of solder down the legs which seemed to work for some, but not all.  I blame myself, of course.  But if I had know the reason I was getting no power was nothing but the POWER CABLE being faulty, this would never have happened!  The soldering to and from the pins multiple times killed them.

I suppose now I have to hope there is a way to repair it.     I was hoping that the chip could be connected to vias on the board. 

More annoying is that when I soldered to the HuChip on the the junk PCE DUO I am re-capping, it was perfect the first time.  I decided to do it yesterday when I was capping.  I suppose I have to hope that the thing works when I finally finish repairing it!  I still have one of my IFU systems plus a SG+SCD2 to mod, but killing a DUO-RX hurts, really badly.  Especially considering how stupidly expensive they have become in the past 6 months!  I paid less than 6000yen for the naked system I f*cked up, I would have to spend almost 4 times that now to replace it.  This is why I never touch my original systems and always buy a second or third system for modding.  My original RX baby is safe and sound in his box.