Diode bridge burned in a French NES frontloader ?

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satchsatch33
Posts: 32
Joined: Tue Aug 28, 2012 9:25 am

Diode bridge burned in a French NES frontloader ?

Post by satchsatch33 » Mon Dec 07, 2015 6:56 am

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

lidnariq
Posts: 8786
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Location: Seattle

Re: Diode bridge burned in a French NES frontloader ?

Post by lidnariq » Mon Dec 07, 2015 4:00 pm

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.

satchsatch33
Posts: 32
Joined: Tue Aug 28, 2012 9:25 am

Re: Diode bridge burned in a French NES frontloader ?

Post by satchsatch33 » Tue Dec 08, 2015 3:15 am

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/10603183 ... 9326974822

lidnariq
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Location: Seattle

Re: Diode bridge burned in a French NES frontloader ?

Post by lidnariq » Tue Dec 08, 2015 12:01 pm

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: Select all

Ground   ACin
ACin     ≈+13VDCout

satchsatch33
Posts: 32
Joined: Tue Aug 28, 2012 9:25 am

Re: Diode bridge burned in a French NES frontloader ?

Post by satchsatch33 » Wed Dec 09, 2015 2:52 am

OK, thank you.

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

Regards.

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yxkalle
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Re: Diode bridge burned in a French NES frontloader ?

Post by yxkalle » Wed Dec 09, 2015 11:03 am

I thought all French NES were RGB out.

satchsatch33
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Joined: Tue Aug 28, 2012 9:25 am

Re: Diode bridge burned in a French NES frontloader ?

Post by satchsatch33 » Wed Dec 30, 2015 9:17 am

It's OK, I've solder a W08M diode bridge rectifier (instead of the original one RC 203), and it worked perfectly !!!!! :D

ApolloBoy
Posts: 76
Joined: Fri Sep 14, 2012 12:17 pm

Re: Diode bridge burned in a French NES frontloader ?

Post by ApolloBoy » Thu Dec 31, 2015 12:02 am

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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