The 42RV530U is known to develop problems in both the power board and the main board.
You can check out our power board repair service at
http://www.coppelltvrepair.com/p/442/repair-service-for-toshiba-42rv530u-power-board-75010942-dead-tv-or-clicking-on-and-off-problem
and I'd also recommend that you search for 42RV530U at http://blog.coppelltvrepair.com as we will eventually release an article on how to test the board.
Hope this helps.
Check this link to find the power supply for your LCD.
$99 for the replacement if that is for sure the problem.
http://cgi.ebay.com/Toshiba-42RV530U-Power-Supply-PE0546-V28A000718A1-A221_W0QQitemZ360118685211QQcmdZViewItemQQptZTelevisions?hash=item53d8bf0e1b
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