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February 19, 2018, 07:56:50 AM
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Author Topic: Famicom AV mod  (Read 1073 times)
Nesmaniac
Famiclone
*
Posts: 12


« Reply #15 on: February 17, 2018, 03:03:52 AM »

Thanks, i need all the help i can get

Post Merge: February 16, 2018, 07:16:01 PM
Do you have a link to Da Bears guide? Where did you buy the parts?

Yes above link that is the guide I followed from Da Bear. As far as the parts go I just used parts from old VCR & DVD player boards mostly only thing new I used was resistors because I already had a bunch of them purchased. I got to test it out for 3 hours this evening playing Kid Dracula and no issues. Only thing different from Da Bear's guide I did was add a 220 UF cap on the audio wire because it was recommended on other mods I've seen. Just put the positive leg of cap running to pin 46 and negative side of cap to center audio post. Let me advise you though if your TV and Famicom works good through RF then I would not do the mod because the composite looks pretty much the same as RF as long as your TV picks up the right frequency. One tv I tried mine on it looks great RF the other bigger TV it was crap which is why I modded this old one. Just be sure not to use any sort of switchbox (like the grey NES modulator) because all you need is a RF to composite adapter that screws into your TV coaxial input then you can use a RCA cable (either video or audio don't matter, if you want best cable use a SubWoofer cable and shorter the better. Those are better shielded than anything else with good grounded sheathing as well. That rca adapter if called a RF-F connector I think they can be bought cheap at radio shack or even cheaper on ebay like a couple of bucks or less. Here's some shots of the AV modded on my 32" HDTV.  Remember this is a mid 1983 Famicom so yours will be a later version I'm sure which will probably have better RF output negating the need for av mod if your tv allows it without interference from basically not being able to hone in on the exact frequency needed usually somewhere between 95 and 96. Seems some auto scan hdtv's pick up the exact frequency like 96.275 for example. My little HDTV does but this bigger one don't. Also, this old famicom won't play the aliexpress 150 in 1 but later ones I've tried it on it works fine. What is the serial number of the one you plan to have modded? Be on bottom starting with an H.

https://scontent.flex1-1.fna.fbcdn.net/v/t1.0-9/27972985_1926517544057242_627661903391399926_n.jpg?oh=6e980170be075040982f73587019a5c3&oe=5B018DD8

https://scontent.flex1-1.fna.fbcdn.net/v/t1.0-9/27973722_1926518217390508_5099097235761699552_n.jpg?oh=bd3504eca951a2c4aadc84822c7699e2&oe=5AD8D9E8

https://scontent.flex1-1.fna.fbcdn.net/v/t1.0-9/27867184_1926520127390317_1239931066165789773_n.jpg?oh=b8a9292ac3484287346549d3cbb1767d&oe=5B0170E9

https://scontent.flex1-1.fna.fbcdn.net/v/t1.0-9/27858811_1926520580723605_6746810694840468898_n.jpg?oh=0d4114f5a0c22818fc3f79f7bab140c7&oe=5B162ED7

https://scontent.flex1-1.fna.fbcdn.net/v/t1.0-9/27972056_1926520954056901_1218440081564633000_n.jpg?oh=c39786313723fce2ddf0146cafdd3e85&oe=5B183F23

https://scontent.flex1-1.fna.fbcdn.net/v/t1.0-9/27858449_1926521664056830_4696029108073943137_n.jpg?oh=9bb217fa28ee126304f036fbe8365607&oe=5B0F9882

https://scontent.flex1-1.fna.fbcdn.net/v/t1.0-9/27858833_1926521794056817_1195391193351588165_n.jpg?oh=bf15273c2bbe25b608c74430555cedff&oe=5B01CDBE

https://scontent.flex1-1.fna.fbcdn.net/v/t1.0-9/28055685_1926523407389989_4683592030597976758_n.jpg?oh=e4b703963a16edd77a4e6dd41dd728ec&oe=5B0DC2A5


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NinjaTurtlesPizzaDelivery
Famiclone
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Gender: Male
United States United States
Posts: 10



« Reply #16 on: February 17, 2018, 06:06:15 PM »

What would you recommend?

Post Merge: February 17, 2018, 08:36:43 PM
H14899154

Post Merge: Yesterday at 12:01:45 AM
Hooked my famicom up with orginal nes rf switch tried channel 1 and 2 on the famicom and 90-99 on my tv and couldnt get it to work. Have any ideas?
« Last Edit: Yesterday at 12:01:45 AM by NinjaTurtlesPizzaDelivery » Logged
FAMICOM_87
AV Famicom
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Gender: Male
Bulgaria Bulgaria
Posts: 325



WWW
« Reply #17 on: Yesterday at 12:36:58 AM »

try manual search , what is your TV old or new ? CRT or LCD model ? Smiley
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NinjaTurtlesPizzaDelivery
Famiclone
*
Gender: Male
United States United States
Posts: 10



« Reply #18 on: Yesterday at 02:09:10 AM »

LCD. I believe i may have fried it, didnt know not to use an original nes power adapter and it was hooked up with it for about 5 minutes while reading some blogs about it. Switched to genesis adapter now.
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FAMICOM_87
AV Famicom
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Gender: Male
Bulgaria Bulgaria
Posts: 325



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« Reply #19 on: Yesterday at 12:47:57 PM »

yes if you used the NES Adapter, you damaged the famicom   Cry
Because in the NES Adapter  is only transformer and nothing else, in the NES unit you have rectifier and filtering  capacitor .
For famicom those parts are inside Adapter, not in the console.( All regular adapters have those parts inside, like  sega one)
So you have to replace 7085 voltage regulator, and the fuse if any (older versions do not have a fuse)
Always use adapters with negative tip and voltage about 9V, 10 V or 12V and at least 500mA or more current , recommended 850mA
https://qph.ec.quoracdn.net/main-qimg-d8761b21189d4608ee4d23806571c41d-c

« Last Edit: Yesterday at 01:03:28 PM by FAMICOM_87 » Logged
Nesmaniac
Famiclone
*
Posts: 12


« Reply #20 on: Yesterday at 03:22:15 PM »

What would you recommend?

Post Merge: February 17, 2018, 08:36:43 PM
H14899154

Post Merge: Yesterday at 12:01:45 AM
Hooked my famicom up with orginal nes rf switch tried channel 1 and 2 on the famicom and 90-99 on my tv and couldnt get it to work. Have any ideas?

As famicom 87 said the channel could be others as well so I always perform auto scan it's just all depends on the TV which of course is why the AV mod is so nice then you don't have to worry about it. RF quality is perfectly fine if everything is tuned right but that's quite a task most of the time.

Your famicom is a few revisions is being at about 15 mill mark. Later ones they started adding another letter after H such as HC & those have teh FF logo on the left side of the family computer logo. I'm not sure if yours will have the RF shield connected to the motherboard directly or by ribbon cable but I know if it's connected without ribbon cable the mod for AV is different and possibly easier. Your famicom should play the newer multicarts like the awesome 150 in 1 from aliexpress (best $5.50 you can spend in gaming)

You did fry it by using the NES adapter. I recently purchased a cool boy one from Canada and guy told me he done same thing and it started smoking. I purchased it and hopefully it's an easy fix of replacing the 7805 and a couple of caps beside it but I don't know because putting AC to DC designed circuit is the worse from my understanding. I did read about a guy who said he'd repaired them before which had suffered the same fate by replacing those components so hopefully easy fix for you and me. You should start by finding an old VCR or DVD player you might have lying around and taking a 7805 out of it (be some good soldering practice) & buy a desoldering pump & soldering iron from amazon you can get them cheap. Just buy ones that gets good reviews usually you can get a inexpensive kit with all that you need for around $20-$25 maybe less. Of course you could go ahead and order a new 7805 voltage regulator & the 1000 uf 6.3 Volt capacitor along with a few 1 uf 50 volt capacitors which I believe is the rating of the 2nd one on the power board. The controller capacitor on the motherboard is the same as that too so I'd just order a mixture of caps if I didn't want to rob some off some old electronics. To do the AV mod you will need 220 uf 16 Volt (or higher volt don't really matter) and a few resistors just depending on what guide you use. Also order you some rca jacks for the yellow audio, and red mono (white mono too if you want sound coming from both speakers without having to use a Y adapter (I use Y adapter to keep the mod cleaner looking on back of console which is like the NES yellow and red AV out). You'll just need to look at your board good and get on youtube find a AV guide that matches your board you have a few options. Just follow them to the T and don't get in any hurry and when you get it working you will enjoy playing it even more than had someone else done it and plus you will know how to do another in the future & repair possible issues that might arise later on.

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MaarioS
Disk System
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Gender: Male
Poland Poland
Posts: 216



« Reply #21 on: Yesterday at 11:26:02 PM »

Just giving a few cents of mine by reading this- if you used an incompatible AC adapter and something starts to smoke then sometimes it's not just "easy fix" where you need to replace the 7805 voltage regulator or something else next to it. In severe cases, you are actually risking to burn your ENTIRE console, including CPU + PPU processors as they can fry just as well and once they do, you obviously killed the heart of your console and it's completely dead forever. This is what actually happened when I got a bunch of Famicoms Classic. One of the consoles had a bad 7805 and it didn't output anything but once I replaced it, it turned out to be that both CPU + PPU were not working whatsoever, so the console was probably killed by some pinhead or kid that tried to use an incompatible AC adapter and that was the console's last breath...

So I repeat, always triple check if your AC adapter is compatible with Famicom and NEVER turn it on with any suspicious AC adapter and once you do, it is NOT easy to repair the console after that, sometimes the console is done for. I repeat it again how serious that is technically...
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