Need help on Sony KV-8000 with troubleshooting.

[Popester]

I haven’t had much success with a sony kv-8000 with no video and has sound. I have traced video with my scope and used my DVM and tonight I got out the B/K 1077B to inject signals. I have no brightness of any kind on the jug. I can put a SMPTE pattern and see color if I play with the intensity control and I see a shift in color bar if I adjust hue. Where I’m stumped is figuring why I have a video signal albeit not the recommended peak to peak level but it’s there. Can’t get video to show up if I inject at cathodes. I have heaters on crt glowing. R,G,B drives aren’t even warm to the touch after being on for awhile. I’m really stumped. I don’t understand how ABL circuit works. Wondering if I got some kind of blanking problem. I tried jumpering coupling caps in video circuit. Any veteran techs that had a lot of Sony experience that might be able to shed some light on my problem? By the way for those that don’t know ABL means automatic brightness limiter.