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That should be an E21 chassis. Check the service switch. Switch it back and forth a few times. All video passes through this switch, and dirty contacts can cause you to loose the video. Back from the switch is the video amp transistor Q904 (I think), it will cause no video as would the failure of the video buffer transistor Q902 (I think). If you have sound then everything up to the sound take off should be ok. This leaves the switch, about 3 transistors, and the low level IC for processing the video. As always 30 year old caps and out of tolerance resistors can kill a transistor, or IC, and bad solder joints in this area could be a problem. There isn't much on the neck board as you noticed other than some biasing resistors.
Bill R
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