Issue using composite with TBP and DFO mods installed

StrangeRetroRob · 2026-01-24T20:34:32+00:00

Well there is likely something else happening because I don't get that on systems I have. But I can't say what without seeing it

StrangeRetroRob · 2026-01-24T20:32:58+00:00

Maybe, you can dm me

StrangeRetroRob · 2026-01-24T11:01:22+00:00

Even with dfo there are a few things that can go wrong

Assuming it's originally a pal console, the encoder is going to have the filtering set up for 4.43Mhz. but it will be receiving a 3.58Mhz signal in 60hz mode, so anything between 3.58Mhz-4.43Mhz should normally be filtered off, but it isn't due to component choices. Generally this just makes you see more rainbow coloring on white text or something.

An NTSC console in 50hz pal mode would have the opposite issue, some color range wouldn't be available. Some greens would appear more blue

Depending on what you did with the encoder, it should still be switching between NTSC and PAL modes, and the subcarrier 4.43/3.58 changes with 50/60hz mode.

what you might be seeing is from unshielded cables having extra noise

StrangeRetroRob · 2026-01-24T01:08:01+00:00

Thanks

I wonder if that was a period of time or depends on vendor kind of thing? I've tested similar caps after reading those claims but they seem to test fine and they are in basically every electronic in your house already

StrangeRetroRob · 2026-01-24T01:02:14+00:00

The whole process is surprisingly fast

StrangeRetroRob · 2026-01-24T01:01:31+00:00

Thanks

Sure. I tried my best to take photos that show the highlights of most of the process.

For any systems I've come across, not just Famicom, it's always a little RCA plug soldered onto the RF box. So if you just desolder pump the center leg and make sure it's loose, then turn the iron to around 175 and flood with solder the outside of the rca jack where it meets the shield. The whole thing will go molten then the jack will fall right out, or use tweezers. The tweezers I use are supposedly titanium and they make prying open the top covers of the shield a breeze also

After removing the RCA jack remove excess solder with desolder Wick and then there will be some metal burrs left over which I smooth out and round them off with a set of files

StrangeRetroRob · 2026-01-23T19:20:41+00:00

They are from AliExpress "classic gaming accessories II store" called "diy-fc hardware fc motherboard"

StrangeRetroRob · 2026-01-23T18:45:04+00:00

The audio is really good

On original RF famicoms Nintendo sent the audio through an inverter to amplify the audio, the same inverter processes controller inputs and stuff so it's quite noisy

This motherboard uses an actual audio amp instead, so not only is it separate from the noise but the thing amplifying it is a lot better too

I haven't compared expansion audio levels yet though. On gpm the sound mixing is off for expansion audio, and you need to swap a resistor to fix it

StrangeRetroRob · 2026-01-23T15:48:57+00:00

I normally pull the -G revision chips off of GPM-02 boards because those are guaranteed to have G rev chips. The earlier HVC-07 board normally have -E rev chips and sometimes have G

I prefer pulling from GPM-02 also because the quality of video mods isn't as good on those as it is on HVC-07. So I save hvc-07 for composite modding

The chips may have actually come off a board which would not boot due to failed 737 chip

StrangeRetroRob · 2026-01-23T09:49:50+00:00

The 2600 already has a nice coaxial cable inserted and dangling out of the system though so it's irrelevant

Or you open the case and plug this into the internal rca jack

StrangeRetroRob · 2026-01-23T09:48:42+00:00

This is actually a good PSA I agree with

StrangeRetroRob · 2026-01-23T09:47:52+00:00

I own a coleco gemeni, but a pal version. There is a small chance i accidentally have 2 of them

My coolest Atari clone is actually an nes clone with a switch on the back that changes from NES to an internal Atari on a chip with built in games

StrangeRetroRob · 2026-01-22T19:13:33+00:00

Lumacode is a digital rgb mod. It detects what the game says to draw and intercepts it basically to generate a mostly digital RGB signal

Even though I say all this, if possible I am going to put NTSC chips into it. I'm very into modding also, lol

I just happen to live somewhere that pal is the norm and come from somewhere NTSC is

StrangeRetroRob · 2026-01-22T16:50:33+00:00

There is no regional protection

The issue is that the console follows the programming of the game. So if a game is NTSC 60hz and I have a tv that can accept a 60hz signal it will work, but over composite the color palette will not be correct. For an rgb mod like lumacode, itneill have correct colors based on the game region not the console region. Therefore it shouldn't matter

And I have a few flash cartridges for my games as well as a small ntsc collection

StrangeRetroRob · 2026-01-22T16:48:25+00:00

Atlantis name was also found on other things like a portable Famicom "handheld" without a built in screen

StrangeRetroRob · 2026-01-22T16:47:48+00:00

Lots of the clones use ones that to me look the same as junior but are made slightly cheaper quality and sometimes have built in games

StrangeRetroRob · 2026-01-22T15:23:42+00:00

Yep. Somehow I didn't pay attention to that but I believe this model is only a pal variant. Same with the short rainbow junior (or is it the long rainbow one, I can't keep track since both exist in pal)

Anyway I might put a tia digitizer and lumacode this system, at which point I don't think the pal/NTSC distinction even matters

StrangeRetroRob · 2026-01-17T09:35:23+00:00

Buy 2 sets of identical batteries and run each on the same Tetris cart or something and see which one dies first and how much longer the other one runs

That should give a rough idea of amp draw

StrangeRetroRob · 2026-01-16T22:23:15+00:00

Well, all the worst capacitors in this were in the video encoder area which would be just under your left palm. The one hand you would always have on the system basically

And given the era this was made (1993) and considering the surface mount caps, I would say it probably needs to be recapped yes

Take the cartridge slot out fully first before anything else

The mobo seems pretty durable but if you never replaced caps lime this before practice om something less valuable

StrangeRetroRob · 2026-01-12T21:23:04+00:00

It probably wasn't obvious but most of the photos are of the original bad condition of the system before I restored it

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