How to unlock control keys on sony projector?

Your problem same like me,just hold on the ENTER button 7 second and than press the SOURCE button,the projector will auto reset.

Turn the projector on and leave in standby mode. To do this press the power on button for 10 seconds until the projector comes on.
To unlock the main panel keys, press the MENU button for 10 seconds.

When the control panel lock ON of the projector so that the projector can be operated only with the REMOTE CONTROL.
If you loos your remote control then keeping the POWER key on the projector control panel pressed for 10 seconds turns the projector ON when it is in standby mode, and turns the projector to standby mode when the power is on. If you press and hold the MENU key for about10 second when the power is on the lock will be released and "panel key lock" is automatically set to "OFF"

Your projector key panel locked you have two option to operate the projector
1 . Use remote control press MENU the menu window displayed.
use DOWN ARROW key and select SET SETTING.
press ENTER
use DOWN ARROW key to select PANEL KEY LOCK.
press RIGHT ARROW key to OFF the panel key lock
press ENTER and then press MENU key to exit the menu.
now you panel keys are working

2. If you loss your remote control then;
When the key panel lock is ON keeping the power key on the projector key panel pressed for 10 seconds turns the projector ON when it is in standby mode, and turns the projector to standby mode when the power is on. If you keep pressing the MENU key for about 10 seconds when the power is ON, the lock will be released and "panel key lock" is automatically set to OFF.

Connect with power cord and turn the projector to the standby mode.
Press the following keys on the control panel in the following order for less than in five seconds each: RESET, LEFT arrow key and RIGHT arrow key and then ENTER.(showing in the picture below)
(NOTE projector must be in standby mode and keys pressed less than five seconds)
now press power/standby key to ON the projector and check lamp hours

Pressing the On/Off Key for 10 seconds switches on and off the projector.
While on, press the menu key for 10 secods to reset it to unlock.

Press and hold menu switch for 10 seconds at on position key will unlock

Press and hold menu key for 10 seconds panel keys will unlock

With System-Lock input window onscreen, press the "MENU", "ENTER", "ENTER", "MENU", "ENTER", "ENTER" and "MENU" keys, in this order,
on the remote controller.

Hi,
After replacing lamp, connect projector AC power cord and turn the projector in standby mode.

Press following keys on control panel for less then 5 seconds each..
RESET, <==, ==>, ENTER.
That will reset lamp timer in projector.
Thanks.