SONY KV-E2531 - KV-E2931 - KV-E3431 -How to ENTER INTO SERVICE MODE AND MAKE ADJUSTMENTS]

Turn on the Main Power button of the set, while pressing any two buttons on its front panel. 
“TT” will appear on the upper right corner of the screen.  Press “Menu” button on the remote handset.

Service Mode Keys

In Menu, select “DEMO” and press ‘OK’.  Select the parameter you want to adjust, and make necessary adjustments.

Cancellation of Service Mode

Exit:  Turn OFF the TV set.