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Author Topic: Technical and Repair Assistance  (Read 636691 times)
Cheetahmen
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« Reply #1395 on: May 15, 2011, 08:42:25 PM »

I have a bit of a problem with my AV Famicom. The sound has gone completely kaputt and now only emits a loud buzzing noise. I checked the connection with the AV cables and the TV and that's definitely not the problem. I believe the cables aren't properly connected to the console (not an expert on the matter, TBH) and need to be soldered to it again. I'd check this, but as far as I'm aware I can't open the console without a special screwdriver end which I don't have.
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ericj
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« Reply #1396 on: May 15, 2011, 11:12:51 PM »

If you've already ruled out bad AV cables and a bad TV, then you'll have to get the special bit and take it apart.

EDIT: Do you mean an AV-modded original Famicom, or an AV Famicom? Huh
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P
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« Reply #1397 on: May 16, 2011, 06:45:15 AM »

It must be an AV Famicom as a normal famicom has normal philips screws.

Look for a special bit usually called "gamebit" for your screwdriver, there are 2 sizes (3.8mm and 4.5mm) and they are used for many consoles. You will have too google it though.

Also make sure it is long and thin enough to be able to reach the screws.
« Last Edit: May 16, 2011, 06:52:56 AM by P » Logged

ericj
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« Reply #1398 on: May 16, 2011, 12:36:29 PM »

I believe the cables aren't properly connected to the console (not an expert on the matter, TBH) and need to be soldered to it again.

^This is what confused me. I think I know what he meant (cold solder joint), but that isn't necessarily what he said by saying the "cables aren't properly connected." He probably meant "the female RCA jack may not be correctly connected (broken solder joint/connection) inside the console." See the difference?  Wink Otherwise, correctly connect the AV cable or try a new one. And yes, I agree about the regular screws on a normal Famicom, unless someone replaced them with different screws.
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Cheetahmen
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« Reply #1399 on: May 16, 2011, 03:47:18 PM »

It's an AV-modded Famicom. I can't open it because the modder added an extra screw which requires the Gamebit. When I get that, I might be able to elaborate on the problem.
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ricky
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« Reply #1400 on: June 01, 2011, 09:51:04 PM »

hi famicom world  Smiley

i'm hoping someone maybe able to help me as i'm pulling my hair out, i recently got given a famicom and i have a pal tv, i tried the av mod but i'm not getting any audio or video, i'm getting the right voltage to the mother board and 5v at the chips but nothing not even buzzing from the speaker, is there anything i can try?

the mother board is a hvc-cpu-07

many thanks in advance  Smiley
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Cheetahmen
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« Reply #1401 on: June 02, 2011, 03:02:44 PM »

Now that I've got my Gamebit, I managed to open the Famicom to see what's wrong. Not much from what I've noticed, and I certainly can't tell what the problem is. Undecided I'll post these photos in case they're any help.

Spoiler  :







Edit: I have no idea how it happened, but when I put the cover back on the sound started working again. I suppose I won't need any more help. Grin Crazy

Edit 2: OK, apparently putting the screws back in managed to mess it up again. I'm confused. Angry
« Last Edit: June 02, 2011, 04:02:10 PM by Cheetahmen » Logged

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ricky
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« Reply #1402 on: June 02, 2011, 06:46:54 PM »

@ cheetahmen - could be pressure on the wire, while the backs off with the famicom on with a game in press lightly on the black part of the red and white wires.

Post Merge: June 02, 2011, 06:50:44 PM
i have checked the chip voltage again and its nearly 7 volts on all of them, the voltage regulator is also outputting 7.1volts, not sure what i did wrong before  Embarrassed is the voltage regulator duff?
« Last Edit: June 02, 2011, 06:52:47 PM by ricky » Logged
Cheetahmen
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« Reply #1403 on: June 02, 2011, 07:10:09 PM »

@ cheetahmen - could be pressure on the wire, while the backs off with the famicom on with a game in press lightly on the black part of the red and white wires.
So how would I able to fix that? Re-solder the wires to the console or something?
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ericj
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« Reply #1404 on: June 02, 2011, 07:13:43 PM »

Could be the voltage regulator (what is the number on printed on it?), or it could be your multimeter. They're cheap, so you might as well replace it.

More than likely the intermittant sound is a bad solder joint or a broken wire in the RCA cable.

So how would I able to fix that? Re-solder the wires to the console or something?

Replace the RCA cable with a new/different one. But, I'd check the solder connections first--one of them looks suspect from your pics.
« Last Edit: June 02, 2011, 07:20:51 PM by ericj » Logged

Cheetahmen
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« Reply #1405 on: June 02, 2011, 07:55:14 PM »

So how would I able to fix that? Re-solder the wires to the console or something?

Replace the RCA cable with a new/different one. But, I'd check the solder connections first--one of them looks suspect from your pics.
[/quote]
Would that be the connection with the red and white cables? That one doesn't look quite right to me.
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ericj
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« Reply #1406 on: June 02, 2011, 08:05:49 PM »

That's the one I was thinking of, but it would be a good idea to check them all.
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Cheetahmen
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« Reply #1407 on: June 02, 2011, 08:21:54 PM »

Will do. Of course, it's finding a soldering iron that's the problem. Tongue
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ricky
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« Reply #1408 on: June 02, 2011, 08:49:53 PM »

Could be the voltage regulator (what is the number on printed on it?), or it could be your multimeter. They're cheap, so you might as well replace it.

part number is lm7805, just tried it with another meter and its 7.1volts again  Sad

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ericj
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« Reply #1409 on: June 02, 2011, 08:52:48 PM »

Are you checking the correct leg and using the right setting on the dmm? If so, replace it. It should be 5v.
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