How can i unlocked the menu of my philips lcd monitor i70t4?? pls help me i cant configure the settings of the brightness and everything..

Please try this:
OSD Lock ?The OSD can be enabled or disabled by
pressing and holding the Menu button on the front panel for
10 seconds. If the OSD is locked, the warning message
?SD Lock?displays for 10 seconds.
?If the OSD is locked, press and hold the Menu button for
10 seconds to unlock the OSD.
?If the OSD is unlocked, press and hold the Menu button
for 10 seconds to lock the OSD.

http://www.fixya.com/support/r4460477-hp_vs_15_17_19_f_1705_1905_lock

Please leave rating if it helps.
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

The lock/unlock function is for locking out the control buttons on the monitor.
http://www.fixya.com/support/r4646147-philips_lcd_monitor_loc_unlock

Hi,

Press and Hold the Menu button (which is towards the left of Power button) for 20 seconds until it displays "Monitor Controls Unlocked" on the screen.

Hope this helps !

Regards,
Shuaib

did you adjust the brightness, also in windows settings?
pls check with another monitor ,also you can check monitor with another pc or laptop
try with reset the monitor settings
also change the resolution and display frequency

it may be in demo mode, try presing "engine" and selecting normal.

Or press menu and select setup and scroll down to factory reset.

open the menu of the monitor. change the settings of automatic brightness configure into manual configure.tnx

Power off Monitor, then power on while holding in Menu Button.

.well i had the same problem but my dad fixed it.
.he opened the monitor [like unscrew it.] and just clean it. brush it. and it will work fine.
if it didnt i dont know.

A 19" Philips LCD prefers a setting of 1440X900 if you are too far off this it will turn itself off.
Right click on the desktop, go to settings and set it to 1440X900 and then go to advanced and make sure the refresh rate is set to 60 Hertz. Shining a flashlight on the screen will help you see.

There other thing that might be causing this is the setting on the monitor itself. Press the Menu button on the LCD and adjust the brightness and contrast.

If all else fails, contact Philips. This is a premium brand and it comes witha 4 year warranty.

Samsung implements protection into their monitors, which allows to block all settings except brightness and contrast. This "Locked" mode turns on by pressing and holding 'Menu' button for 5 seconds, and turns off by pressing and holding 'Enter' button for 5 sec.