weird rgb issue with my pc engine

I'm experiencing a weird image issue with my pc engine console. I made an external rgb cable using etim's av driver. I crimped some crimp terminals to the loose wires and connected the cable with the expansion port. I have this setup for more than a year.
Some days ago, I got some crosstalk-like of green and red color noise signal lines across the screen. On a cold boot,and while I'm at the everdrive screen everything seems normal. When I start a game, the lines will appear in 1 or 2 minutes, and remain there even if I power the console off and on again.
Fiddling with the cables I noticed that the culprit might be one of the red or blue signal lines. I tried soldering the wires directly to the underside of the expansion port as I don't have any more crimp terminals. I'm having the exact same issue or messed up/missing colors.
I made a new cable with another av driver I keep around, and I have the exact same issue. On this cable though, the screen and sound is also going off and on in 2 second intervals.
To make things weirder, using a plain composite cable, everything works normal!!
I was suggested to do a full recap, which I plan to do. Do you believe that recapping the console might solve my issue?

 

Yes! But if your unlucky you also got trace damage. Some older white pc engines have brittle traces. The caps are usualy ok but it couldnt hurt to change them. But check the traces from the HuC 6260 to the pin heather for continuity/resistance

 

So,I used my cheapo multimeter to check the traces. My multimeter doesn't have a beeper, instead a digital display. On the red,green and blue traces the display reads 001 . Is this a sign of failing capacitors? I also discovered something suspicious on the 7508 regulator . Around the trace of the input side seems to be a weird bulge,as if the green mask was ripped . There seems to be no continuity between the leg of the capacitor next to it (on the chip side of the board) .

Apart from that,I'm in the process of getting another console that is already rgb modded,but has a wavy image . Can this be fixed by recapping too ?

 

No cant say thats a sign of cap damage. If i remember correctly, there are no caps between the 6260 and the pins. And that low a ohm seems like good traces to. However there must be som area og low resistance between the lines.

Check restistance beteewn the rgb traces, and pins on the 6280. May be there is cap fluid leeked on the traces? That migt get conductive and cause picture deteriation.

Wayvy lines can be a number of things.
Bad power supply, bad 7805, bad caps. Or most likley to me a rgb amp ground on the wrong place or another ground problem.

Think thats all i got

 

I did a recap my console, but managed to lift the pads of capacitors 101 and 117.. Both of them are placed on places with darker solder mask with no visible traces. Any idea where these capacitors are traced at?

 

so on 101 the positive terminal goes to the small via right under the c of c105. you might be able to patch that one to a small point if you follow that trace comming from the via. c117 positive turminal goes to the nerby trace under the text RF. negative side goes to the closest side of r149.

happy patching!

 

Thanks a lot for the advice! Its rather late for me to do any patch work now.Following your advice I marked the places I need to patch on these photos, if I got it straight. What about the negative leg of 101?It goes on one of the traces I marked?

 

negative of 101 is just ground. it doesnt go to the other trace.

 

Nice I'll come back when I patch the traces and report if the issue vanished

 

I patched everything and put back together, switch the power on, but nothing happens

 

well thats no good. and your sure that none of the two caps are shorted to ground? i think one of the patches looks a litle iffy? check for shorts on the 5v.. thats the best i have right now. if no shorts i can pick up my multimeter and try to help on fryday.

 

I re-did my soldering on these caps, checked around the board but nothing seems suspicious to my knowledge. Still no power.
The LED on the everdrive blinks for an instant, and then nothing.
I suspect somewhere might be a short, but decided not to dig it any further. I'll probably give it to friend that has working experience with electronics to determine what's wrong.

 

if the led on the everdrive comes on, then the 5v is probobly ok. most likly a continuity problem then. i guess you have checked continuity on the damaged traces on the caps? dont give up!