You might try what works on my Samsung PLH403W (a 1999 LCD RPTV widescreen): MUTE 182 POWER to enter service menu. VOL +/- to select code. MENU(+) MUTE(-) to change data. Changes are automatically stored when you turn the set off. (The service manual says to use SURROUND to store and MTS to exit without storing, but these don't work on my set.)
If this accidentally works for you, be sure to record your existing settings before changing anything.
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