I Have replaced all the boards (main board, t-con and power board). I still don’t have a picture, but I do have sound. It’s an LG LED TV. 50UK6500AUA.BUSJLOR. Any other suggestions?
Did you do the flashlight test?
Yes, when I did the test it was only blue, no picture
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Try using a meter to test circuits instead of just changing things
Did you replace the ribbon cable and check the backlights?
Testimonial: "I can see backlights from the back. And the screen looks blue from the side. I don’t know how to replace the ribbon cable"
When you see the backlights are they illuminated?
If not then with the TV on if you shine a torch light into the screen and see a picture then it is the back lights that are not working, you can either use a circuit tester to check each led and replace the blown led or replace the whole strip!
If you cannot see a picture then the ribbon cable from the T-con board to the screen is faulty.
Thanks. When I did the flashlight test, there was no picture. It was only blue.
With all the boards replaced the only things left are the backlights and the cable to the screen, get your circuit tester out and check both items.
The symptoms you described point to the T-con board, but since this has been replaced we can eliminate that.
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does the screen totally black or with only white screen?. recheck all the connections going to t-con board and x board which you missed.
SOURCE: Samsung TV goes Black but keeps sound
you will need to check weather the 24vdc supply for the inverter board is good no drop voltage. if no supply check the power supply board. then you should check if their is a inv_on signal at the power inverter board around 3v-4.4vdc . if goes out during power on tried to disconnect the supply going to the inverter board to ensure if their is a shorted parts in the inverter board. if the inverter_on signal also goes out even with out inverter board connected that was mean you have problem in the processor board.
SOURCE: How does a T-con Board works?
It is difficult to type in all here by this window, as it is too much. If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/
You either have a bad t-con board or the screen is bad. Check to make sure all the ribbon cables are seated fully and connected. Even replacement parts can be bad sometimes, new and used both.
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