[Popester]

Grimy, where? That set looks pristine to me. I see your problem. It's got no power cord hence why it's dead lol😂. One very important thing to mention is that if you get down to troubleshooting with a scope or VTVM you want the power of the tv plugged into an isolation transformer. Not sure these are transformerless for the power. All servicing of modern tv's or old ones, radios tube or SS an isolation transformer is a must to protect you and the vital test equipment you might have against dangerous shock. Thanks for the photos please continue with the troubleshooting.