No, not new bulb, more likely to be power supply or back light inverter boards, worst case will be the main logic board.
Parts for your TV: http://www.shopjimmy.com/catalogsearch/result/?q=Samsung+LN-T4042H+
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
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