LG 42LD320B Owner's Manual page 41

Use NUMBER buttons to input a 4-digit password in Lock System 'On'.
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L : SECAM L/L' (France)
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BG : PAL B/G, SECAM B/G (Europe / East Europe / Asia / New Zealand / M.East / Africa)
I : PAL I (U.K. / Ireland / Hong Kong / South Africa)
DK : PAL D/K, SECAM D/K (East Europe / China / Africa / CIS)
To store another channel, repeat steps 4 to 9.
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