Famicom av mod instructions?

[GohanX]

I can give you some for free, just pay shipping

Awesome, I'll shoot you a PM!

[famifan]

since the jailbars disappeared i think it's time to write a short and complete mini "how to"/FAQ separate thread about AV modding. Who wants? Maybe later it will become an artictle for famicomworld.com.

[famiac]

Agreed. People shouldnt have to read through this whole thread to get the most of their famicom's composite video signal.

[UglyJoe]

If somebody produces a good write up, we'll sticky the thread.  (A future site article is also a possibility).

[jpx72]

since the jailbars disappeared i think it's time to write a short and complete mini "how to"/FAQ separate thread about AV modding. Who wants? Maybe later it will become an artictle for famicomworld.com.

...at least for two models CPU-07 and GPM-02, the rest is similar.

[UglyJoe]

...at least for two models CPU-07 and GPM-02, the rest is similar.

I think that's the main reason we don't have an A/V mod article on the main site -- it would be preferable to have a guide that covers all models.

[famifan]

for workaround in general you can rebuild discrete buffer + amp outside instead of using the buffer from fami's PCB.

[UglyJoe]

I'm not going to sticky a thread so that people can read through 19 pages of conflicting data

I went through the thread last night and I'm not sure what the solution is, exactly.  Is it some combination of the instructions on jpx72's page plus some copper tape on the PPU?  I'm a total newbie when it comes to console modding, so that's really the most I could get out of the thread.  There are some other ideas/solutions in the thread, it seems, but I can't make sense of them.

[famifan]

Is it some combination of the instructions on jpx72's page plus some copper tape on the PPU?

to summarise the steps:
1) shield the PPU crystal by some copper foil
2) use any AV-amplifier circuit you want. At least 3 variants you can find in this thread.
3) if unsatisfied with results (e.g. to much jailbars) - add ceramic capacitors as closer as possible to every ICs' power pins. 0.1uF al least. It is better to use SMD caps with the biggest capacitance you can find (also, can be a little expensive)

it looks like the other steps are unnecessary.

[GohanX]

I would add lifting/cutting the composite video pin, that made the biggest difference in eliminating jailbars on my system.

[deusswe]

Hi there, first time poster, longtime anon-lurker.

I've tried my unworthy hands at doing the AV-mod following the schematics by Kyushu but now I've hit a wall and I was hoping that you guys could help me out (hopefully without tearing me a new one).

The problem is that my TV just displays a blue screen when I hook up my Famicom (HVC-CPU-07 if that helps any ^^), I've checked all the cables and joints and I've even re-soldered the whole thing 4 times with new components just to end up with the same problem.

I'm guessing that I've managed to put something backwards or something but hey, trial and error is a great teacher!

[fredJ]

Maybe you need to clean the cart.

[deusswe]

The carts are clean and I've tested them in another unit so I know that that's not the issue. Tried once again this morning and this time I got more colors! (One at a time but hey, it made me happy for some reason), I have now seen blue, purple and grey!

I'll try to get some pictures but at the moment my camera is having a seizure or something.

Perhaps it's the transistor, I only had some PNP 9015C 100mA 20V ones at home, could that be the bastard in the mix? 

[famifan]

if you see color and not only blank/black/blue screen, your transistor is 99.95% okay

i suppose this is the bad connection issue. Try to find the "right" cartridge position within the slot.

[deusswe]

I get one color at random each time I reset the console, it's either blue, grey or purpleish, no movement or changing of colors except for when I reset.

I'll give jiggeling the cart a try, thanks for the suggestion