Question about Samsung LE40R74BDX 40 in. LCD Television

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Clicks on /off when power is switch on

Clicks on and off repeatedly when power is switch on . No picture or sound .

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Replace the mainboard and the TV will work better than a new one.

Good luck.

Posted on Jul 01, 2009

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I can get a piture and sound if i do the following.

Leave the TV on for a minute or two then unplug the power while still on. Plug back in and power on. I begin to get sound, repeat and then I get a picture for a few moments then blue again. Repeat and then I get constant picture with defunct colors. I then use the remote to power off and back on an color corrects. sometimes have to repeat this as well. Sometimes it takes unplugging, replugging, and powering on up to five times before i can sit down to watch tv.

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Hi! the trouble indicates that your television's picture is the culprit, have your unit check by a qualified technician for verification.

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Picture fades to black then reappears and repeats fades to black .


Is the sound ok. Yust the Picture. If both dissapear replace power supply board. That is the main big board with the most heatsinks on it. Main power gos from a switch board to main power supply.

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Sounds like the typical Flyback and shorted horizontal output transistor. Problem is the transformer is NO Longer Available

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