sync problem with arcade monitor video amplifier ultimarc

[ninjitsu12]

hello friends, I have a sync problem, I recently bought a video amplifier card just like the ultimarc one, but when I connect it the monitor is out of sync, I'll send you the pictures for you to take a look at.
before I was connecting the rgb and the arcade sync directly on the video card like there are some tutorials on the net and it worked normally, but I want to use this video amplifier.
thanks

[buttersoft]

No idea what's going wrong. You might try running everything else through the amp but wiring sync directly from the PC to the arcade chassis or however it worked before, bypassing the amp. Probably a good idea to connect ground to both, tho. I'm assuming it's a PC, btw?

[ninjitsu12]

hi buttersoft, sorry but I didn't quite understand your answer, yes it is a pc.
another thing I looked at the ultimarc website, and there are explanations, but I didn't understand it right, I know that on the video amplifier card, there is this cut for H/V, now I don't understand how to turn it on

[buttersoft]

I meant that you bypass the amplifier for the sync line. So, when you had everything setup without the amp, make that same connection for sync now, but take the RGB lines only and feed those through the amp. Sync might not need to do through the amp, and if not, it should sync the same way it did before you had the amp.

If that doesn't work, please post a link to the amp and we can look at what it says.

[ninjitsu12]

Hi Buttersoft I managed to solve the problem.
On my video card pin 9 didn't have the 5 volts that the video amplifier card needed.
So I tested it on another video card I have here, and that pin 9 is the 5 volts the card needs and it worked.
On this video card that doesn't have the 5 volts I'll have to solder a wire to the amplifier board that is behind, and take this wire to my source that has 5 volts.
Thank you Buttersoft

[buttersoft]

Hah,  i was actually going to say you should check the pins on the VGA cable, but i thought you'd said you were powering the amp externally.

So, it needs both external power and internal VGA power?

[ninjitsu12]

So Buttersoft, actually the video amplifier it needs the video card to have 5 volts on pin 9, if not you will need to solder a wire to the back of the amplifier board, and connect this wire to the source of the computer you have the 5 volts.
I'm sending the photo, where you should solder the wire.

[Zebidee]

I was using my Ultimarc video amp the other day, and thinking how much I wished it had a soft LED to let you know it was powered.

[ninjitsu12]

It's true Zebidee, it would be easier if he got into trouble.

[Zebidee]

Easy to use a digital multimeter to confirm appropriate voltages on the amp's RGBS outputs

[ninjitsu12]

I understand Zebidee.