Nintendo/Sanyo Video Inverter question

[shilmover]

I have a couple of Sanyo monitors, neither of them is perfect so I am trying to at least restore one.   

One of them kicks out normal video, the other inverted video.

I have an inverter that I picked up somewhere, but I noticed that the lead that comes off the main board to the inverter board is missing the ground wire...  When I measure between the red lead and gnd, I get a reading of 24V, but I dont know if that's correct.

Does anyone have a picture of where on the main board the gnd lead is connected?

[cw]

the inverter (the ones I have seen anyway) run on 5v.

[Kevin Mullins]

The original inverter board actually runs off a 16v source from the main chassis if it's all original. But will also run from a 12v source if using a switching power supply.

The ground is accomplished through the video signal input ground connection.... there is no other ground wire for the power. Just a single positive voltage lead.

If you are running an original Nintendo board, then you do not need power to the inverter board. (heck, you don't need the board at all actually)
If you are running a JAMMA type board then you DO need power to it otherwise it will not work.

One of them kicks out normal video, the other inverted video.

Do you mean that the picture is upside down/backwards?

If so, then it has nothing to do with that "inverter" board...... the original inverter board deals with the color inversion, not the physical picture orientation.

[shilmover]

The original inverter board actually runs off a 16v source from the main chassis if it's all original. But will also run from a 12v source if using a switching power supply.

The ground is accomplished through the video signal input ground connection.... there is no other ground wire for the power. Just a single positive voltage lead.

If you are running an original Nintendo board, then you do not need power to the inverter board. (heck, you don't need the board at all actually)
If you are running a JAMMA type board then you DO need power to it otherwise it will not work.

I am using a combination JAMMA and Original Nintendo board (it has both and I can switch between them.

Strange!...  If I connect it without the power lead (although it does seem to be there just for this board) it doesn't really do anything...

Do you mean that the picture is upside down/backwards?

If so, then it has nothing to do with that "inverter" board...... the original inverter board deals with the color inversion, not the physical picture orientation.

No, the colors are inverted.

[Kevin Mullins]

I figured this was the same issue as from your other thread.
(and yes, the inverter board is there for the color inversion problem)

OK.... let's see if I can help clear the inversion thing up a bit.

You will need to have power going to the inverter board for sure. 12-16VDC
(because you plan to run a JAMMA board)
The inverter board will do absolutely nothing without power when using the INVERT OUT side for JAMMA type boards.
When using the NON-INVERT OUT side for Nintendo games..... the inverter does not need power.
You only need power to either pin 1 OR pin 2 (not both) because they are tied together on the solder side. Ground is obtained through the video signal ground.

Run your video input signals from either game board to the input on the inverter board.
 
The only connector on the inverter board that you should have to swap is the "INVERT OUT" and "NON-INVERT OUT" directly on the inverter board itself. This is the connector that goes from the inverter board to the main chassis of the monitor.

INVERT OUT= if running a JAMMA type board
NON-INVERT OUT= if running a Nintendo board

The Non-Invert Out side actually bypasses the inverter board all together since the Sanyo20EZ in Nintendo cabs are modified to run Nintendo games without it. There are actually components missing on the main chassis in order to achieve this.
The inverter board is only there to be able to run other NON-Nintendo game boards, essentially replacing those missing components.

Here's a pic that may help also -

[shilmover]

Kevin,

Thanks for this info.  This is exactly what I was looking for and completely explains what what happening (when connected to the non-invert, i saw inverted video, and connecting to the invert did nothing since there was no power).  I will get power going ot the board and try it.

BTW, the issue I was having on the other thread was dumb user error (the 48-in-1 had the "upside down video" DIP switch turned to upside down.   )

[Kevin Mullins]

So does your 20EZ have the single red power wire coming from the chassis?
(has a three pin connector but only one wired pin)
If not then you can run a 12vdc wire from the switching power supply.

Looking forward to an update on this one. 

Glad to hear the other "inverted" issue was as simple solution such as a DIP switch setting.

[shilmover]

So does your 20EZ have the single red power wire coming from the chassis?
(has a three pin connector but only one wired pin)
If not then you can run a 12vdc wire from the switching power supply.

It does, but measured 24V not 12.

Looking forward to an update on this one. 
[/quote\

Me too.   

Glad to hear the other "inverted" issue was as simple solution such as a DIP switch setting.

Yup... it was me being a 'DIP'   

[Kevin Mullins]

It does, but measured 24V not 12.

Hmmmm.... I hope that hasn't damaged anything on the inverter board if it has been plugged into it. Although there is nothing super special on the inverter board that can't be easily replaced.

Is it possible for you to take a pic of exactly where that power lead is coming from on the main chassis?

[shilmover]

Is it possible for you to take a pic of exactly where that power lead is coming from on the main chassis?

Sure...  I will try to do that tonight.

[shilmover]

Okay...  so here is something strange.

I got one of the monitors back.  Its the one that did not have the inverter board.

When I connect the JAMMA to it, I see the picture.  When I connect the DKJr board to it, its inverted.   

Did Sanyo Monitors ever ship without inverted video?  Or did someone modify the monitor?

So now I need the inverter board when running DKJr, but not JAMMA.  Is there a way to get 16V from Nintendo?

[Kevin Mullins]

Did Sanyo Monitors ever ship without inverted video?  Or did someone modify the monitor?

When they were originally designed they were not inverted. The inverted modification was done strictly for Nintendo. So if it came out of an original Nintendo cabinet then I'd say someone changed it back to a standard monitor. But it's hard to say what the real history is on a particular monitor.

Read through the end of this thread to help with your questions.
http://forum.arcadecontrols.com/index.php?topic=53576.40

And look to see if those components are on your chassis.
There's a pic of where to check for the 16V as well.
And keep in mind that the inverter board does NOT work in reverse like you are thinking, especially if those components are on your chassis.

[shilmover]

Did Sanyo Monitors ever ship without inverted video?  Or did someone modify the monitor?

When they were originally designed they were not inverted. The inverted modification was done strictly for Nintendo. So if it came out of an original Nintendo cabinet then I'd say someone changed it back to a standard monitor. But it's hard to say what the real history is on a particular monitor.

Read through the end of this thread to help with your questions.
http://forum.arcadecontrols.com/index.php?topic=53576.40

And look to see if those components are on your chassis.
There's a pic of where to check for the 16V as well.
And keep in mind that the inverter board does NOT work in reverse like you are thinking, especially if those components are on your chassis.

Crap.  I guess I either need two monitors, get one that does the inversion or just use a JAMMA Adapter for now.

[Kevin Mullins]

When I connect the DKJr board to it, its inverted.   

I just re-read your earlier post and realized it said DKJr ......
And after looking at the monitor schematics in the manual for that particular game I think that one outputs a standard video signal. (someone else may be able to clarify for sure)

Which if that's the case then you could do the mod to that chassis and be able to run both the DKJr and the JAMMA boards without any inverter board or anything of that such. Just connect straight to the main chassis.

I'll poke around a bit and see what I can find out...... that may make all the difference in the world to your troubles.