Author Topic: Picture of modded RGB output in a Plus anyone?  (Read 1228 times)

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Offline ||C|-|E||

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Picture of modded RGB output in a Plus anyone?
« on: 19:28, 06 April 16 »
Hi!

I would like to add the 3 capacitors to the RGB output of my Plus because it suffers from the vertical streaks in certain degree. I remember that it was described in a post, long ago, that it is possible to solve the problem adding a 220pf capacitor to each colour signal ( Dirty video on 6128 Plus RGB Scart ). However, although I was looking for it, I could not find a picture of a modded board. It is not the end of the world because I have the service manual but I would really appreciate to see a pic if somebody did the mod already. I was also considering to prepare a external adapter for this, but I think that is cleaner to do it on the board of the computer  :)

Thank you!


Offline Bryce

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Re: Picture of modded RGB output in a Plus anyone?
« Reply #1 on: 11:35, 07 April 16 »
My Plus was modded, but I took the easy option. The capacitors were soldered to the pins directly under the Monitor connector. That computer has since been permanently converted to S-Video now though, so the caps were removed and all filtering is now done on the S-Video PCB.

Bryce.

Offline ||C|-|E||

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Re: Picture of modded RGB output in a Plus anyone?
« Reply #2 on: 13:29, 07 April 16 »
Thank you Bryce! That approach sounds great and easy indeed  :D The only thing I am still considering is if I am going to do it in the motherboard or as an external filter. Yesterday I had quite clear that it would be in the motherboard but then I was thinking that the external filter should be small enough and would offer the possibility to unplug it at will  :)

Offline Bryce

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Re: Picture of modded RGB output in a Plus anyone?
« Reply #3 on: 14:40, 07 April 16 »
It's neater inside. If you really want to make it switchable, add a switch or jumper to the GND connection to the capacitors.

Bryce.

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Re: Picture of modded RGB output in a Plus anyone?
« Reply #4 on: 15:03, 07 April 16 »
Huum... that jumper idea is actually great, it did not think about it, how stupid of me  :picard:

Offline ||C|-|E||

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Re: Picture of modded RGB output in a Plus anyone?
« Reply #5 on: 03:22, 10 April 16 »
So, I already did it. These capacitors are really small but once soldered the modification is not intrusive at all . At the end, I decided not to put a switch or a jumper, they are easy enough to desolder if it is eventually necessary, although I do not think it will be the case  :)   

[attachimg=1]

It actually makes a difference, even with the original CM-14 screen, so it is definitely something I would recommend  :)
« Last Edit: 19:57, 10 April 16 by ||C|-|E|| »

Offline seanb

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Re: Picture of modded RGB output in a Plus anyone?
« Reply #6 on: 17:28, 11 April 16 »
Will be trying this shortly
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Offline ||C|-|E||

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Re: Picture of modded RGB output in a Plus anyone?
« Reply #7 on: 23:20, 11 April 16 »
It is actually a very easy mod, particularly because Bryce already told us what is necessary to do and checked the values of the caps  :D

Offline Audronic

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Re: Picture of modded RGB output in a Plus anyone?
« Reply #8 on: 01:45, 12 April 16 »
@||C|-|E||

Pin 7 looks a bit suspect would it be possible to reflow the solder Please.

Ray
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Offline ||C|-|E||

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Re: Picture of modded RGB output in a Plus anyone?
« Reply #9 on: 04:23, 12 April 16 »
Sorry, I am editing the post because I did not understand you well, the jet lag is killing me :D

Yeah, there are a few soldering points in the original board I do not particularly like. I think that the guy/girl that did the job could have been more careful. I do not know if it is actually worth going through them, though.
 
« Last Edit: 04:41, 12 April 16 by ||C|-|E|| »

Offline Bryce

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Re: Picture of modded RGB output in a Plus anyone?
« Reply #10 on: 10:40, 12 April 16 »
@||C|-|E||

Pin 7 looks a bit suspect would it be possible to reflow the solder Please.

Ray

You're right. In fact pins 1, 3 and 7 all look like they have the beginnings of a dry joint. I'd reflow all three of them.

Bryce.

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Re: Picture of modded RGB output in a Plus anyone?
« Reply #11 on: 16:06, 12 April 16 »
I will have to go very carefully through the whole board then, since there are a few more of those  :) . I also found a few (that I reflowed) when recapping the CM-14...  :-X