It's pretty old so cruise ebay for parts like http://www.ebay.com/itm/Runco-PL-61cx-ViVix-Video-Processor-Scaler-Pixel-for-Pixel-Controller-PlasmaWall-/331141364012
150 is what they charge here to show up at your door. So that's a bargain.
I've seen an old thread regarding a similar problem, but since it is quite old, I am starting this anew.
I bought a Runco PL61cx in the 1990's. Based on what I have read here and elsewhere, I am guessing that the Runco Processor Box may be the source of the problem.
In another thread, a box is described which is not the same as mine. I am guessing that it is a more recent model. In my processor box there is only a main board with a plug in FPGA chip (Ver 2.18), a tiny front panel board (PW-516-102, I think) and a small but common power supply board. There are no fans, no insulation, in fact, the box has very little inside. The only heat sinks that I see are on the power supply board.
None of the caps on any of the boards look blown, although I haven't tested them with a meter.
I've lost my picture, although depending on the settings that I choose, I get some sort of signal including vertical colored lines, partial ghost images, etc. Sound is fine. The plasma screen is attached to the wall, so I haven't done any troubleshooting there. The system has worked fine for about 20 years, since purchase. This is the first time that I have had a problem.
Is anyone here familiar with this version of Runco's PL61cx processor? Any suggestions other than re-seating the FPGA chip?