Fixyourdlp has an easy guide to resetting the hours when you replace the lamp:
Begin with the TV powered off.
Point your remote towards your TV.
Press:
Mute + 1 + 8 + 2 + Power.
Your TV set should now say “Loading Factory”.
Browse down to “Option” then press Enter (or the right cursor button).
You can read all about it here: http://fixyourdlp.com/blog/2007/02/15/resetting-your-samsung-dlp-lamp-hour-meter-counter/
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