Sounds like fault with its main power supply bard too. Check all the wiring connections from the main board to SMPS board for any loose connection. Improper wiring too can cause this fault, due to AC line interference. Check these well, before replace the SMPS [power supply] board.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
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