Famicoms with various issues. Famicom has loose power connection ect.

Started by laserpinhead, May 25, 2013, 03:39:51 am

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laserpinhead

I purchased a lot of 6 damaged famicoms on ebay. I've been able to fix about two of them so far but a few remain that have some interesting issue. 

The first problem is a famicom I have that works perfectly fine except the power jack is very picky, When I power on the console I sometimes need to nudge the power jack a bit to the right before it even powers on. I assumed I needed to resolder the loose point to the circuit board. Bit I am a bit worried about whether that is the right course of action. Should I resolder the connector or replace the power jack?

The next issue is a little weird, this Famicom also powers on with no issues but the display is in black in white completely.

The next famicom does will boot up but will display only a light blue screen and nothing else. Woudl I be correct in assuming the rf output is damaged here? or does this sound like a motherboard issue?

The last famicom powers on but displays nothing, I am almost certain this one has an issue with the rf board.
Thank you in advance for anybody that offers their advice.

aha2940

Hi!
Quote from: laserpinhead on May 25, 2013, 03:39:51 am
The first problem is a famicom I have that works perfectly fine except the power jack is very picky, When I power on the console I sometimes need to nudge the power jack a bit to the right before it even powers on. I assumed I needed to resolder the loose point to the circuit board. Bit I am a bit worried about whether that is the right course of action. Should I resolder the connector or replace the power jack?

Resolder it could be a first step to see if it gets fixed. It probably will get fixed and if not, it won't damage anything if you do it properly.
Quote from: laserpinhead on May 25, 2013, 03:39:51 am
The next issue is a little weird, this Famicom also powers on with no issues but the display is in black in white completely.

Try to do the AV mod to see if the problem is with the RF output or if the PPU has problems. If the first, doing the AV mod bypasses completely the RF module so you will be sure. If you also get B/W image with the AV mod, then something else is wrong.
Quote from: laserpinhead on May 25, 2013, 03:39:51 am
The next famicom does will boot up but will display only a light blue screen and nothing else. Woudl I be correct in assuming the rf output is damaged here? or does this sound like a motherboard issue?

This one is tricky. It could be a dirty cartridge connector, or a broken CPU/PPU. Try cleaning throughly the cartridge connector and see if it improves. If it's the RF module, you can do the same AV mod and see if it works.
Quote from: laserpinhead on May 25, 2013, 03:39:51 am
The last famicom powers on but displays nothing, I am almost certain this one has an issue with the rf board.

Same steps as the third one, try with av mod.
Quote from: laserpinhead on May 25, 2013, 03:39:51 am
Thank you in advance for anybody that offers their advice.

You're welcome :)

80sFREAK

Quote from: laserpinhead on May 25, 2013, 03:39:51 am
I purchased a lot of 6 damaged famicoms on ebay. I've been able to fix about two of them so far but a few remain that have some interesting issue. 

The first problem is a famicom I have that works perfectly fine except the power jack is very picky, When I power on the console I sometimes need to nudge the power jack a bit to the right before it even powers on. I assumed I needed to resolder the loose point to the circuit board. Bit I am a bit worried about whether that is the right course of action. Should I resolder the connector or replace the power jack?

The next issue is a little weird, this Famicom also powers on with no issues but the display is in black in white completely.

The next famicom does will boot up but will display only a light blue screen and nothing else. Woudl I be correct in assuming the rf output is damaged here? or does this sound like a motherboard issue?

The last famicom powers on but displays nothing, I am almost certain this one has an issue with the rf board.
Thank you in advance for anybody that offers their advice.
It's very nice, that you bought six Famicoms, but would be nicer, if you introduce yourself proper.

Suggestions above are close, but not exactly correct.

2 aha2940 - RF unit has nothing to do with colour encoding.
I don't buy, sell or trade at moment.
But my question is how hackers at that time were able to hack those games?(c)krzy

P

Here are my amateurish advices.

1) I would first open the Famicom and see if I could locate exactly what part is loose if you haven't done that already.

2) Black and white usually means your TV can't handle NTSC or PAL colours. But I've never seen a pure black and white picture through RF. Usually the whole picture is really bad if the RF is out of region. What region are you in laserpinhead? Are you sure it's an original Nintendo Famicom?

3) I also suggest to first try cleaning here. There are lots of threads about cleaning cartridges and cartridge connectors here if you search.

4) Maybe 80sFREAK can give advice on this one.

laserpinhead

Thank you all again for your advice.  Anyways, yes let me introduce myself, I'm a novice electrician and repair guy, with things still to learn, I'm also a bit of a collector when it comes to vintage video game consoles. Which is how I came across this lot of consoles. I very rarely jump into things when I feel I don't understand it completely so I felt I should ask the forum for its advice before I tried this.
Anyways, the famicom with the loose power jack is fine now but the others are a different story.

80sFREAK advised that the the famicom with the clear black and white display would have nothing to do with the rf adapter and every famicom that works aside form this one displays perfectly in color so, I think the best course of action is to desolder the good rf adapter from this unit and give it to the the famicom with that displays nothing when turned on, I think its a safe bet to assume the motherboard is perfectly fine in this one.

I think I'll do the same procedure with the famicom that displays a blank blue screen upon boot, Ill switch its motherboard with another famicom I have that displays nothing when powered on.  

As for your question P, Im form the Us region.

ringl

Quote from: laserpinhead on May 27, 2013, 01:21:01 am
Thank you all again for your advice.  Anyways, yes let me introduce myself, I'm a novice electrician and repair guy, with things still to learn, I'm also a bit of a collector when it comes to vintage video game consoles. Which is how I came across this lot of consoles. I very rarely jump into things when I feel I don't understand it completely so I felt I should ask the forum for its advice before I tried this.
Anyways, the famicom with the loose power jack is fine now but the others are a different story.

80sFREAK advised that the the famicom with the clear black and white display would have nothing to do with the rf adapter and every famicom that works aside form this one displays perfectly in color so, I think the best course of action is to desolder the good rf adapter from this unit and give it to the the famicom with that displays nothing when turned on, I think its a safe bet to assume the motherboard is perfectly fine in this one.

I think I'll do the same procedure with the famicom that displays a blank blue screen upon boot, Ill switch its motherboard with another famicom I have that displays nothing when powered on.  

As for your question P, Im form the Us region.


You can try that but I dont think it will make the repair.

The RF unit is very reliable, it does not break so often.

There is a main fuse on the RF board, did you check that this is ok and you have power to the cartridge slot on the famicom that has no output?

Next you can also listen for audio on pin 46 of the cartridge connector.. if you have power and audio out then there is soem display out issue, perhaps then it coudl be RF.

finally wht do you mean by clear black and white?

you can see the picture clearly but it is black and white or you only see a full white screen?


80sFREAK

Quote from: laserpinhead on May 27, 2013, 01:21:01 am
Thank you all again for your advice.  Anyways, yes let me introduce myself, I'm a novice electrician and repair guy, with things still to learn, I'm also a bit of a collector when it comes to vintage video game consoles. Which is how I came across this lot of consoles. I very rarely jump into things when I feel I don't understand it completely so I felt I should ask the forum for its advice before I tried this.
Anyways, the famicom with the loose power jack is fine now but the others are a different story.

80sFREAK advised that the the famicom with the clear black and white display would have nothing to do with the rf adapter and every famicom that works aside form this one displays perfectly in color so, I think the best course of action is to desolder the good rf adapter from this unit and give it to the the famicom with that displays nothing when turned on, I think its a safe bet to assume the motherboard is perfectly fine in this one.

I think I'll do the same procedure with the famicom that displays a blank blue screen upon boot, Ill switch its motherboard with another famicom I have that displays nothing when powered on.  

As for your question P, Im form the Us region.
Good boy  8)
B/W picture appeared because color subcarrier is off your TV set tolerance. Find green(usually) plastic trimmer on PCB, "shake" it with screwdriver. If nothing changed, you might need replace trimmer or even crystal.

Blue screen(should be GPM-02 revision) - clean slot very well, resolder it.

Black screen - check voltage on CPU, PPU and every other chip. Should be 5V with 0.1-0.2V tolerance. If not,replace 7805 and 1000uF capacitor around. If nothing changed, you will need oscilloscope.
I don't buy, sell or trade at moment.
But my question is how hackers at that time were able to hack those games?(c)krzy