Koolhass wrote:Great news! I recapped the system, and now works flawlessly!.... almost. I'm back to square one with the faint jailbars. I still see them. A summary:
System fully recapped
i did not remove the C5 capacitor
i did not remove the Q1 transistor
i did not cut the trace of original video line (i prefer not to do it in case i want to rollback the mod)
NESRGB wiring:
RED, GREEN AND BLUE to AV pins 1, 2 and 4.
CS# to AV pin 9
...
with that wiring and a N64 CSYNC SCART cable from RGC ( How is this cable wired for CSYNC?: 75 Ohm resistor between pins 9 (sync) and 5 (ground) inside the MultiAV plug. 470 ohm resistor between output of LM1881 (sync separator circuit) and SCART pin 20 (For CSYNC cable only).220uF capacitors in series with each RGB line.)
...through and OSSC gives me perfect video signal.
So, i know that first i need to remove C5 capacitor and q1 transistor to try toimprove image. With this, and the RGB cable, i will not kill again my capacitors???
Cheers!
Glad to hear its working now
However, you appear to have left the original AV Famicom's Composite video line intact, whilst also connecting up the NESRGB TTL level CSYNC output to the same AV port pin - this is not good.
If you want to use the Composite video pin to carry CSYNC, you need to free up that pin so it is no longer connected to the original circuit - either by cutting the trace, or removing components if you want the mod to be reversible (I'm not certain because different motherboard revisions label components differently, but follow the Composite video pin trace backwards and you should find it connects to C6 and R6) Alternatively just use one of the other free AV port pins and wire the SCART cable accordingly.
You have a number of options regarding CSYNC and you need to decide what exactly it is you want/need. It sounds like the cable you are using has a built-in sync stripper? If so this is unnecessary for the NESRGB.
Using the original AV port Composite video pin but not freeing up the pin first, and then using a SCART cable with a sync stripper inside, will only lead to further complications.
In my opinion the most simple setup is configuring the NESRGB J8 jumper to output 75ohm CSYNC:-
https://etim.net.au/nesrgb/NESRGB-Pinout.pdf
Then wiring it up to an unused AV port pin (Pin 7 Luma, or Pin 3 CSYNC, are both unused on the AV Famicom) and then using a passive (pass-through) CSYNC cable that is wired to use this AV port pin. This is assuming you dont intend to use this SCART cable with any other Nintendo consoles.
Also, removing the Q1 transistor is highly recommended as previously mentioned.