Boosting RGB from the AES

Xian Xi

JammaNationX,
Joined
Dec 1, 2005
Posts
27,684
So I ran some tests on a 1st gen AES, RGB output was rather dim. Did the normal cap and resistor swap which only fixed curling at the top.

After studying the circuit, I decided to alter the voltage divider to try and increase the output of the RGB. I swapped out the 2.2k resistors(confirmed they were still within spec) and replaced them with a higher resistance to increase the voltage output.

I did some calculations comparing to an MV1Cs output and average was 0.853v Vpp, so to make the 1st gen output the same level I swapped out the 2.2k with 2.8k resistors.

RGB is now gorgeous and is the same brightness from a 3-6 board revision.

I'll add some pics later. This should help on the 1st gen and 3-3 revisions.

Edit: Here's the video on my instagram:

https://www.instagram.com/p/BCbNPcppYs6/?taken-by=jamma_nation_x

Here's the before and after, BVM settings are on default for brightness. I used 2.8k, if it's too bright for your liking I suggest using 2.7k. Pic might look overly bright but that's the damn iPhone trying to balance the white level. If you have an MV1C via RGB, it's about that level.

rgb-boost-comp.jpg
 
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wyndcrosser

Baseball Star Hitter
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Apr 24, 2012
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1,268
Are you collectively putting this specific type of info up at JNX.com?
 

Xian Xi

JammaNationX,
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Dec 1, 2005
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27,684
I will later in the week. There's a video on my Instagram.
 

ballzdeepx

Tesse's Maintainence Man
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Sep 20, 2004
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2,932
Interesting, will be curious to see.
I did the cap swap on a 1st gen AES not too long ago and it drastically helped with the dim image issue. I suppose i'm just happy with it but look forward to the info.
 

Electric Grave

So Many Posts
No Time
For Games.
Joined
Jan 29, 2004
Posts
20,259
Did you steal that PVM from a wrestling show?! lol, those are awesome, ebinsagwa brought one to a meetup, they're pretty cool, but don't tell him I told you so...lol.
 

Xian Xi

JammaNationX,
Joined
Dec 1, 2005
Posts
27,684
Did you steal that PVM from a wrestling show?! lol, those are awesome, ebinsagwa brought one to a meetup, they're pretty cool, but don't tell him I told you so...lol.

I got it from city41 on these forums, he hooked me up and I was so happy to finally have one. My 2530 is way too big for a work room.
 

max 330 mega

MAX POWA SURGE!,
Joined
Dec 14, 2004
Posts
2,769
this is my console, i can attest that the video is amazing on it now. looks just as good as my CMVS.
thanks again dude!!!
 

Fakk2

Crossed Swords 2 Bootleg Artist.,
Joined
Mar 8, 2004
Posts
1,548
Good job brother! Damn that looks REAL nice James!
 

wyo

Master Brewer, Genzai Sake Co.,
Joined
May 22, 2013
Posts
7,194
Great work brotha, I gotta try this!
 

Xian Xi

JammaNationX,
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Dec 1, 2005
Posts
27,684
The RGB bypass will achieve the same results except this method also helps with composite and svideo from the onboard CXA encoder. That's why I prefer it this way.
 

tacoguy

Rasputin's Rose Gardener
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Feb 19, 2015
Posts
723
Interesting, will be curious to see.
I did the cap swap on a 1st gen AES not too long ago and it drastically helped with the dim image issue. I suppose i'm just happy with it but look forward to the info.

I had mine done by a local modder and i thought it looked good. Better than it was before the cap swap. But this seems like it will put our AES up to par with the best AES.
 

wyo

Master Brewer, Genzai Sake Co.,
Joined
May 22, 2013
Posts
7,194
The RGB bypass will achieve the same results except this method also helps with composite and svideo from the onboard CXA encoder. That's why I prefer it this way.

Will it put composite on a par with later revisions? Dot crawl is really bad on 1st gen units.
 

GadgetUK

Robert Garcia's Butler
Joined
Sep 27, 2013
Posts
1,280
Good job! Very interesting! I've not noticed my early rev giving a dark output, but I am connecting to a modern LCD - I suspect my TV compensates because every crappy signal I feed it with looks perfect, whereas on other TV's not so much... Might do this mod to mine at some point. Thanks for sharing =D
 

Xian Xi

JammaNationX,
Joined
Dec 1, 2005
Posts
27,684
Will it put composite on a par with later revisions? Dot crawl is really bad on 1st gen units.

Yes, when paired with the normal AV cap/resistor swap it makes a big difference.

Good job! Very interesting! I've not noticed my early rev giving a dark output, but I am connecting to a modern LCD - I suspect my TV compensates because every crappy signal I feed it with looks perfect, whereas on other TV's not so much... Might do this mod to mine at some point. Thanks for sharing =D

From what Jeff Kurtz told me, there were a few different versions of the 1st gen. Which kinda makes sense as whenever I was repairing/modding 1st gens, it was never consistent. Some were dim while others looked great and some in-between.
 
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