Sanyo 20-EZ Inverter Board Issues

[Hiub1]

Hey folks. I am at it again repairing a second Sanyo 20-EZ. I have one in my R-Type that was running fine and dandy til today, but more on that later.

I just finished a cap kit on another Sanyo, and when I got done, I fired it up to see how it looked. The output was set to Invert on the inverter board, and I got nothing on the display. When I switched it back to Non-Inverted, I get the regular backwards color picture from Mame. Figured the inverter board might be bad, so I replaced it with the Inverter board on the R-Type that was working fine at the moment. Same thing occured, and I got no display when I set the display to Invert.

I have the +16V lead attached and I do get a good readng from that. The only weird thing was that when I measured the voltage on the working monitor, I got about +12, but on the non-working monitor, I got +16. Other than that, I do not see any differences, and I don't think the inverter board is bad since i swapped them and got the same results.

On another note, while I was measuring the voltage on the working monitor, I shorted out the 16V with one of the pins on the Non-Invert pinout, and now I just have either a black or white display depending on where the connector is. I haven't done any troubleshooting, so I don't know if I have fried the inverter board or maybe a fuse or something, but if you have prior experience with the matter, anything helps.

Any help is greatly appreciated!

Thanks.

Fred

[Lutus]

Do you know which pin you "shorted out" the +16V with? 

[Hiub1]

It was the 4th and 5th pin of the Non Invert out on the board. 1st pin would be on the side where the color pots are on the inverter board.

Thanks!