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PostPosted: Mon Dec 07, 2015 6:56 am 
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Joined: Tue Aug 28, 2012 9:25 am
Posts: 32
Hello,

I've recently bought a French SECAM NES Frontloader, sold as broken (sorry for my bad english).

I've try to boot it, and after a few minutes with crackle sound and yellow (or blue) horizontal screen bars on the top of the screen, my NES turns off, and now, everytime I try to turn it on, it works for one second then it turns off by itself.

Some people told me that it comes from tension regulator (7805), and others told me about diode bridge rectifier.

Is anyone can give me the diode bridge references ?

Regards


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PostPosted: Mon Dec 07, 2015 4:00 pm 
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Joined: Sun Apr 13, 2008 11:12 am
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Location: Seattle
If the SECAM NES is sufficiently like the NTSC one, the AC→DC→regulator is inside the RF box. There are four discrete diodes inside, relatively large ones.

The behavior you describe is consistent with something overheating, but it's hard to say what.


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PostPosted: Tue Dec 08, 2015 3:15 am 
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OK, thank you.

In this pic, you can see the four points which corresponds to the diode bridge on the daughterboard, but I don't know how to check it with the multimeter.

Here it is https://plus.google.com/photos/106031839599326974822/albums/5607391276063522929/5731651416297156306?pid=5731651416297156306&oid=106031839599326974822


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PostPosted: Tue Dec 08, 2015 12:01 pm 
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Joined: Sun Apr 13, 2008 11:12 am
Posts: 6526
Location: Seattle
Evidently I was wrong and/or the SECAM NES differs, that's a standard 4-pin full bridge rectifier.

From the point of view of that picture:
Code:
Ground   ACin
ACin     ≈+13VDCout


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PostPosted: Wed Dec 09, 2015 2:52 am 
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Joined: Tue Aug 28, 2012 9:25 am
Posts: 32
OK, thank you.

I will disolder it shortly, and solder a new one.

Regards.


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PostPosted: Wed Dec 09, 2015 11:03 am 
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Joined: Sun Jan 27, 2013 7:30 pm
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I thought all French NES were RGB out.


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PostPosted: Wed Dec 30, 2015 9:17 am 
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It's OK, I've solder a W08M diode bridge rectifier (instead of the original one RC 203), and it worked perfectly !!!!! :D


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PostPosted: Thu Dec 31, 2015 12:02 am 
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Joined: Fri Sep 14, 2012 12:17 pm
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yxkalle wrote:
I thought all French NES were RGB out.

It's not true RGB though, just composite video that's been decoded to RGB.


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