How do I fix my SAMSUNG LN52A750R1F tv powers on with no picture?

If your Samsung TV does has sound but no picture showing up on the TVs screen you will need to reset the TV then. By unplugging your TV and wait a about 60 seconds. While the TV is unplugged press and hold the power button for about 30 seconds. After 60 seconds are plug your Samsung TV back in again after.

Watch:
https://www.youtube.com/watch?v=UdYeC12zfGY

My LED TV has sound, but no picture. - Tom's Guide

www.tomsguide.com/answers/id-2771720/led-sound-picture.html

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TV Has Sound But No Picture Troubleshooting Guide ...

? 2:30
https://www.youtube.com/watch?v=ysHfaQKI45M
Aug 31, 2012 - Uploaded by Repair.com
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Samsung LCD TV No Picture but has Sound - Electronics ' DSLReports ...

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DSLReports

Hi there
I would go to menu on the remote , from there to picture go down the list, if you do not find anything there to help you. Go to Support and to the E manual .
Kolbrun

The T con board is faulty. It is the board with flat ribbon cables going to the bottom of the screen. It is not hard to replace this board. You can get one from here:
TV Parts Universal TV Stands DLP Chips ShopJimmy

probably a bad T-Con board. this board is the interface between the panel and main board. call 1-800-samsung for nearest service center.

Please return it ASAP. This is not normal.