Vertical sweep failure.
It will be an I.C. with a part number that probably starts with an LA_
_ _ _ and be on a heat sink in the vicinity of the connector
going up to the yoke. Try replacing that. But first, check
all the electrolytic caps around it for testing dry (sorry - takes a
special meter to do it in circuit) or just replace them. May have
lost power to the I.C. as well. Look the I.C. up in the
free NTE crossreference at nteinc.com get a diagram of its pinout to
find what pins the power and outputs are on.
Hope ya fix it!
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