2.List a few steps to start troubleshooting

-opened the set and went straight to the vertical circuit.- replaced the vertical I.C.-resolder parts in vertical section circuit such as open fusible resistor or fuse that may cause for loss of power in vertical deflection circuits.-clean or replace switch accessible at the back panel that may have been dirty and with already bad contacts-resolder most common of all are bad contacts and connections such as cold solder in vertical deflection circuit.-Check for pins especially those big components like capacitor, resistors transistors and transformer terminals.-apply cleaner at the circuit board and use magnifying glass to better see hairline cuts-apply little pressure at components and see if there are loose and pins are moving on the board.