Before opening it's cover, we tested the press button switches at the front panel.

All buttons function perfectly except for the horizontal size.

With some slight knocks on the monitor, we noticed the display changes.

Display becomes perfect on and off.

This shows that there are dry joints on the solder boards.

Notice that there were some black patches on the board.

We then procede to resolder all the dry joints visible.

Further testing shows display perfect.

No pincushion anymore.

Button for horizontal size functions perfectly.

Display comes back normal.

Notice that there were some black patches on the board.

We then procede to resolder all the dry joints visible.

Further testing shows display perfect.

No pincushion anymore.

Button for horizontal size functions perfectly.

Display comes back normal.