Sony KD-43XE7 Series Service Manual page 137

03.17 Option Bit (Tuner ID)
1) Go to "Shipping Region" and Press "" or "" button
to select *Tuner ID. (availability depends on SW pkg)
2) Press enter to confirm Tuner ID. Pop-up will
display
3) Press "<" to select "Yes" & press "Enter" to
confirm.
4) Pop-up will display & TV will reboot to reflect the
new option bit setting.
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