Philips 20PT643F Service Manual page 61

2. Use the MENU UP/DOWN keys to highlight the OPTIONS sub menu.
3. Press the MENU LEFT or MENU RIGHT key to enter the OPTIONS sub menu.
4. In the OPTIONS sub menu, press the MENU UP/DOWN keys to select 'OP 1'
through 'OP 7'.
5. Use the number keys on the remote control transmitter to enter a new value for
the selected option byte. The value must be entered as a three-digit value (for
example, '4' would be entered as '0 0 4').
6. The selected value must be between '0' and '255'.
7. When all desired changes to the option bytes are made, press the MENU button
to return to the top level SDAM menu. This will save changes to the option byte
settings.
8. To ensure the option byte changes take effect: Turn the television set OFF by
using the POWER button on the remote control transmitter or the local keyboard.
Disconnect the television set from AC power for at least ten seconds. Reconnect
the television set to AC power. Turn the television set ON by using the POWER
button on the remote control transmitter or the local keyboard.
Figure: Options menu
How to change iTV Option Bytes
An Option Byte represents a number of different options. Changing these bytes directly
makes it possible to set all options very quickly. All options are controlled via five option
bytes.