It can be that the power supply is sensing shorts circuits so it goes into turn off/turn on cycle. You need to look inside. It can be the power supply module may have failed due to bad caps.
Parts:
http://www.shopjimmy.com/catalogsearch/result/?q=Toshiba+32AV502R+
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net
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