Sony GDM500PS horizontal deflection problem

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I have a Compaq P110 (same as sony GDM500PS) which got bumped in transit. It
mow suffers from a horizontal deflection problem - negative pincushion )(
and flickering top and bottom corners. I have the service manual, but would
appreciate advice on where best to go looking for dry joints, dead caps etc
with these particular symptoms. Board D (the deflection board) seems the
logical place to start, but as the horizontal deflection is *almost*
working, its not likely to be a catastrophic failure of the horizontal
deflection driver... could it also be a problem with one of the other boards
supplying clock, sync or adjustment settings?

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