Neogeo AES RGB scart not syncing to Sony BVM correctly

neogeoaes16 · Jan 16, 2015

Hi, I get a shifted image when I use RGB scart on my AES. The Neogeo Aes is connected to my Sony BVM through a scart to BNC adapter. Composite video doesn't have the shifted image on my BVM.

Also I tested the AES RGB scart cable on my regular crt with a scart to component transcoder and the pictures fine.

I have a jrok video encoder installed on my AES. Component video also has the same shifted image.

Should my scart cable be wired a different way?

Any ideas?

fremen · Jan 16, 2015

Hi,

You can try to add a resitor in the sync line on the SCART (pin 20), try with 1Kohm resistor.

Un saludo

Atro · Jan 16, 2015

Desolder the composite video pin from the DIN end.
Tie again that wire to pin 7 on the DIN.

It will solve the sync issues, you will however lose the ability to use composite video ( who cares anyway? ).
You can also use a sync cleaner to resolve your sync problems. But it's gonna hassle you a bit more to do it.

amaradona · Jan 16, 2015

You can also try with raw or pure sync rgb cable.
If I remember well,BVM needs pure sync.

neogeoaes16 · Jan 16, 2015

Atro said:
Desolder the composite video pin from the DIN end.
Tie again that wire to pin 7 on the DIN.

It will solve the sync issues, you will however lose the ability to use composite video ( who cares anyway? ).
You can also use a sync cleaner to resolve your sync problems. But it's gonna hassle you a bit more to do it.

I soldered Composite video to pin 7 on the din connecter and I still get the same picture. Also I tried my other scart to bnc adapter that has a sync stripper in it and the picture is the same

skate323k137 · Jan 16, 2015

try a 220ohm resistor on sync

Yodd · Jan 16, 2015

It seems, unlike most PVM's, the BVM's are fussy bitches when it comes to the sync signal.

wyo · Jan 16, 2015

AES serial? Reason I ask is early AES models have incorrect caps and resistors for RGB. If your monitor is picky, maybe this could be the cause.

GadgetUK · Jan 17, 2015

In an early AES you might need to swap out the 5 x 100uF caps for 5 x 470uF caps like I did. I did a video on it but mine wasn't displaying anywhere near as bad as yours. When I removed my old 100uF caps I measured them at less than 40uF each! So the caps also go bad!

neogeoaes16 · Jan 22, 2015

I have 3-6 motherboard. I tried a 29ohm resistor on sync (scart pin 20) and got the same picture. Should I buy some 220ohm resistors and try them on the sync line?

skate323k137 · Jan 22, 2015

neogeoaes16 said:
I have 3-6 motherboard. I tried a 29ohm resistor on sync (scart pin 20) and got the same picture. Should I buy some 220ohm resistors and try them on the sync line?

My bad, that's for MVS. Try following GadgetUK's advice

fremen · Jan 22, 2015

Hi,

220 ohms resistor value is not correct, usually for RGB lines is used 470 ohms and for sync is recommended 1 Kohms value, although these are the values for a MVS, you can use untill 3 Kohms in the sync line depending on the TV used.

Un saludo

neogeoaes16 · Feb 4, 2015

fremen said:
Hi,
I just Tried uà
220 ohms resistor value is not correct, usually for RGB lines is used 470 ohms and for sync is recommended 1 Kohms value, although these are the values for a MVS, you can use untill 3 Kohms in the sync line depending on the TV used.

Un saludo

I just tried different resistors on scart pin 20 of the AES scart cord. 220 ohm did nothing,470 ohm did nothing, 1k ohm acted like the ext was turned off, 2.2k ohm same as 1k ohm. Do you guys have any other suggestions?

wyo · Feb 5, 2015

neogeoaes16 said:
I just tried different resistors on scart pin 20 of the AES scart cord. 220 ohm did nothing,470 ohm did nothing, 1k ohm acted like the ext was turned off, 2.2k ohm same as 1k ohm. Do you guys have any other suggestions?

Have you checked the internal caps and resistors?

neogeoaes16 · Feb 5, 2015

wyo_vr4 said:
Have you checked the internal caps and resistors?

They should be fine since rgb scart works great on my regular CRT tv.

shadowkn55 · Feb 5, 2015

You need to add a sync separator on the scart cable. A 3-6 AES doesn't output composite sync. Both pins 3 and 7 output composite video.

neogeoaes16 · Feb 5, 2015

shadowkn55 said:
You need to add a sync separator on the scart cable. A 3-6 AES doesn't output composite sync. Both pins 3 and 7 output composite video.

I have have have two scart to bnc cables one with a sync stripper and one without one. I still get the same picture with both.

Xian Xi · Feb 5, 2015

neogeoaes16 said:
I have have have two scart to bnc cables one with a sync stripper and one without one. I still get the same picture with both.

Is it set to external sync?

neogeoaes16 · Feb 5, 2015

Xian Xi said:
Is it set to external sync?

Yes, the monitor is set to external sync.

neogeoaes16 · Feb 18, 2015

Any other suggestions?

GadgetUK · Feb 18, 2015

Maybe it needs recapping! All 5 of the 100uF caps I removed on mine were measuring less than 40uF. On mine they gave a similar problem but it was a lot less noticable.

BanishingFlatsAC · Feb 18, 2015

Are you setting the monitor to ext sync and setting up a new profile for it? I was under the impression that all BVM have the external controller, and I don't see it in your picture.

neogeoaes16 · Feb 18, 2015

GadgetUK said:
Maybe it needs recapping! All 5 of the 100uF caps I removed on mine were measuring less than 40uF. On mine they gave a similar problem but it was a lot less noticable.

It's not a cap problem, since it looks fine on my regular CRT tv.

neogeoaes16 · Feb 18, 2015

Yes, my monitor is set to ext sync and my controller attached to the bottom of the monitor.

BanishingFlatsAC · Feb 18, 2015

Do you have access to a stock homecart system? Might be worth a shot trying that to see if it gives you the same image.

Neogeo AES RGB scart not syncing to Sony BVM correctly

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