Question about Samsung Televison & Video
I've performed a flashlight test and can confirm that the image is showing up on the screen but the backlights won't kick on.
Take off the rear and check the high voltage circuit. 120 volts enters follows by a fuse into a small high voltage transformer, then on the other side a capacitor (100 uf rated 450 volts). Check the DC voltage here. I got 380 volts. Should be at least 390 volts or more. If anything less, you will need to replace this capacitor. I used two capacitors from some old power supply - 150 uf and 220 uf rated at only 400 volts connected them in parallel and TV is back to normal.
Posted on Jan 12, 2018
Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
Posted on Oct 08, 2016
SOURCE: LG 47LN5750 No picture
If you have backlights its not going to be the tcon for future reference. you have some shorted or open LEDs in the panel. Check the voltage going to the LED sets, should be 100 plus volts
Posted on Nov 16, 2017
You have some bad LED lamps in the panel, its not a fun job to get at them and change them but if you watch a couple vids it should give you an idea how to do it, other issue is cost as the light strips can be expensive depending on the set and its size...Good luck!!
Posted on Dec 11, 2017
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