Klax - No Video

philt80

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Recently picked up a KLAX PCB to install in my Tetris cabinet. The board plays blind as expected but I'm hitting a wall with video. Is there something special I need to do with this particular PCB to get it to work properly?

The cabinet has a WG 19K7610 monitor installed and I have tried all sync options but cannot get it to display an image. This monitor works fine with Tetris and all other JAMMA boards I have tested in the cabinet.
Attempting to install in the only other JAMMA cabinet I own actually shows an image but the picture is out of sync on that older monitor.

Thanks in advance for any ideas you may have!
 
I think I may have found the issue. There are a few corroded resistors which I believe contribute to video sync in this area of the circuit. I'll order replacements and see if this fixes it. 🤞

IMG_5051.jpg


Also noticed capacitors in part of the audio circuitry appear corroded/crusty despite audio working fine.
IMG_5052.jpg

The rest of the board looks fairly unremarkable.
IMG_5054.jpg

The solder side also looks unremarkable. No cold solder joints or corrosion on the back.

I'll report back with an update if replacement of the resistors and caps corrects the issue. Thank you all for any additional input if you see anything else that may need attention from the photos above.
 
All is good after replacement of the corroded resistors at R102 and R91. :)

IMG_5058.jpgIMG_5060.jpg
 
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