Open the remote control of Samsung Television (the board must have an identity.: D-19H), find the key hidden more below the key TV / VIDEO, it would go to service mode.
Use channel up or channel down to select and use the volume button to change the value data.
Samsung DY-450 TV Service menu
Photo credit : imactoy.com
Universal Remote - Service Mode - TV Factory menu codes
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https://tvservicemenu.blogspot.com/2009/07/samsung-dy-450.html.
Author : Meilyn, Ricky and Akzai Rajali
Editor : Denny Wowor
Samsung DY-450 TV Service menu (All TV Service Menu Code)
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Samsung DY-450 TV Service menu mode, Samsung DY-450 TV factory mode Written on July 07, 2009