No error code 14 according to the service manual. Try self-check mode: [press & hold 'VOL v' on the tv panel and 'OK' on the remote for 3+ seconds.] Self-check menu appears. 'NG' beside any item denotes 'no good'. For a factory reset: [press & hold 'VOL v' on the tv and 'MENU' on the remote for 3+ seconds.]
Switch off at mains to exit either mode.