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why is my Samsung tv model cs-21z58ml,when I plug it in the socket the standby Led yellow light flashes once for a second then goes off?what seems to be the problem?help

@jymo single flash/blink is usually related to a bad power board. Remove the back off of your TV and take a look at all off your boards. Looks for obvious damaged components like leaking, domed caps etc. Post some images of your boards with your question so we can see what you see. Use this guide Adding images to an existing question for that.