The TV will turn on then the video goes black but the audio works. What could be the problem?

T-Con board is the problem so replace it

Sounds like the fl tube inverter board power is failing. All flat panel screens us thin fluorescent tubes to light the edges of the screen, and when the tubes fail either from age or due to a power issue the screen will go black.

Test your panel lamp voltage lines and see if they drop off when the screen goes black

Samsung HL-R5087W TV screen goes blank -tv/sound on - Forums ...

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CNETJun 11, 2015 - About a month ago, the at various times the tv screen would go blankeven though the tv ... Try turning off the cable/sat box when the happens. ... In reply to: Samsung SP50L7HX DLP TV linked to Sky HD box - same problem .... on it comesback to normal. however, once it went off again (Black Screen) after only 2-3 minutes. ln-t4069f picture problem lcd warmup - Forums - CNET
Jun 11, 2015
Samsung LCD TV LN-T5265F Black Screen Diagnosis Help ...
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this works for me.....hold down the off button on top of the tv for at least 5 seconds....(not the remote).....then try the remote on button

if it does not work the first time....try holding down the tv off button a bit longer

The backlight inverter which is also part of the power supply needs to be replaced. If you feel comfortable you can replace the blown capacitors on it.

If you need further help, reach me via phone at https://www.6ya.com/expert/steven_a67ead41eb5fc62a

Need s to be replaced the main board.

Contact Sony. There is a software update for this. Go to www.Sony.com for contact information.

Ur video board is dead.Or the video socket connect to the CRT(tv tube) is cold solder.

your backlight is going out.. get it replaced