HOW TO ENTER SERVICE MODE TO ZENITH BRAND TVs

# Turn the TV on.
# Hold down the MENU button on remote until the on-screen menu disappears or "Welcome Message" appears then release the MENU button and within two 2 seconds press the following five buttons:
9 8 7 6 ENTER or 9 8 7 6 DISPLAY

# The Service Menu will be displayed.
# Using the remote control buttons:
MENU > Toggles between two menu pages.
UP/DOWN > Selects the item for adjustment.
LEFT/RIGHT > Varies the value
POWER > Exit service mode and saves adjustments made.

# Service Menu -1
Press and hold the MENU button on the remote and the MENU button on the TV at the same time, until the first Service Menu is displayed.
# Service Menu -2
Repeat the above sequence:
Press and hold the MENU button on the remote and the MENU button on the TV at the same time, until the second Service Menu is displayed.
# Press and hold the MENU button on the remote and the MENU button on the TV at the same time
# If a password screen comes up: Press and hold the MENU button on the remote and the MENU button on the TV at the same time again, until the Service Menu is displayed.
# Press and hold the MENU button ON THE REMOTE until a 4-digit password screen is displayed.
# Then try any of the following codes to access the Service Menu:
0 0 0 0
7 7 7 7
8 7 4 1
# Press and hold the MENU button ON THE REMOTE. (The menu on the screen will disappear)
# Now Press and hold the MENU button ON THE PANEL.
# Keep both buttons pressed until the Service Menu is displayed, and then release the 2 buttons.
# using the remote control buttons:
MENU > Toggles between two menu pages.
UP/DOWN > Selects the item for adjustment.
LEFT/RIGHT > Varies the value
POWER > Exit service mode and saves adjustments made.