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Famicom World

Family Computer => Technical & Repair Assistance => Topic started by: hvc01 on June 05, 2014, 03:46:50 am

Title: twin famicom vertical lines
Post by: hvc01 on June 05, 2014, 03:46:50 am
Hi,

First time poster short time follower.  :)

I have had my twin famicom AN500-R for a month now and I cannot really complain as it works fine. Only trouble is the vertical line problem which I assume are the so called jailbars. I have read about the av-mod and ppu shielding for the famicom but wanted some advice by a kind sole regarding what the best fix is, if possible. I have pulled the thing apart and the ppu has an aluminium heatsink covering it. I was thinking of shielding the ppu with aluminium tape and grounding this. Any thoughts or advice would be much appreciated.

Thanks
Title: Re: twin famicom vertical lines
Post by: fredJ on June 07, 2014, 01:40:16 am
I don't know of any fix, but if you install the RGB-kit it will fix the problem....
Although frankly I don't think the vertical lines are very noticeable on twin famicom. Try tweaking with the light on the TV a bit.
Maybe your console has severe case? If that is the case, sometimes the caps are getting old.
Title: Re: twin famicom vertical lines
Post by: hvc01 on June 07, 2014, 06:54:16 am
Thanks for your help. All the caps look fine. Maybe they aren't good on the inside. Who knows :bomb:
Title: Re: twin famicom vertical lines
Post by: hvc01 on June 08, 2014, 06:07:38 am
Will go with an AV famicom instead  :pow:
Title: Re: twin famicom vertical lines
Post by: L___E___T on June 08, 2014, 06:35:21 am
To be fair you can get a crispy clear picture from 30 years old technology, but not usually straight outta the box.

I'm not into crispy clear for Famiom, but I hate jailbars.

I do however like RGB on the Mega Drive, that was very easy to achieve as it just needed an RGB cable, nothing more, and the result is very nice.
Title: Re: twin famicom vertical lines
Post by: modeltfordman on June 10, 2014, 08:10:22 am
My Twin also has jail bars, but tbh it is not really that noticeable unless I look for them.
Title: Re: twin famicom vertical lines
Post by: hvc01 on June 11, 2014, 01:50:41 am
Well at the end of the day it isn't the end of the world. The games work and I can play them and they aren't terrible.  :bub:
Title: Re: twin famicom vertical lines
Post by: hvc01 on July 09, 2014, 04:43:15 am
Hi again. So far I have made no progress with reducing the jailbars on this system. I lifted pin 21 and used the av mod circuit to output signal directly. Maybe a slight improvement but nothing major. Is there anything else I should try before I buy another one? Any advice or help much appreciated.
Title: Re: twin famicom vertical lines
Post by: hvc01 on July 10, 2014, 02:22:59 am
I tried capacitor from pin 22 to 20, 220uF 16v. I will try pin 1 also. Where is the third place to decouple from? Also I'll try the copper tape. Maybe that'll sort this out. Thanks a lot for your help.   :)
Title: Re: twin famicom vertical lines
Post by: hvc01 on July 11, 2014, 01:17:26 am
Quote from: 80sFREAK on July 10, 2014, 07:01:17 am
pin1?  ??? There is nothing to do with pin1

sorry i saw the picture and its pin 1 of cpu which is grounded  :)


Quote
Can you upload some photos?


i'll upload some photos when i have another play with the console over the weekend. thanks again for your help.

i'm sure i'll get it looking better.
Post Merge: July 13, 2014, 03:20:04 am

The twin fami is dead  :-[. I must have shorted it out when i tried to get some more copper tape around the ppu. Nevermind I have had success with an original fc and i some more on the way to keep me busy. Thanks for your help.

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