srarcade80
New member
So i've been trying to figure out this strange problem on this one cab. The screen fades out to black and stays dark. It randomly brightens a little bit and goes dark again. I checked out the signal cable, it was good, swapped out the chassis, same problem on another chassis. Figured the tube was shot, so I swapped the tube out, worked great for a day then problem came back. I put in another jamma harness and power supply, same problem. So then i tested the voltage going into the chassis from the isolation transformer. Its 134V! Tested the voltage going in, its 122V. So I ran the power to the monitor from another cab, confirming it was getting 120V from the line out of the isolation transformer. Powered up both cabs with signal from one, voltage for monitor from the other. Pic is still dark.
So with the 134V coming out of the isolation transformer, is that causing the tubes to go bad? I chucked the other tube I switched thinking it was dead since the new one fixed it right away but then had the problem again later. I would suspect it would wreck the chassis first. I have never seen this problem in 15 years.
So with the 134V coming out of the isolation transformer, is that causing the tubes to go bad? I chucked the other tube I switched thinking it was dead since the new one fixed it right away but then had the problem again later. I would suspect it would wreck the chassis first. I have never seen this problem in 15 years.

