1. open the back cover of the TV, disconnect the cable between the main board & the power supply.
2. Apply the AC power to the power module, if the back lights are not light up, change the LED strips (IF the back lights are bad, in some case, the power supply also been damaged), If the back lights are light up, please change the main board.
SOURCE: Samsung 32'' LCD TV backlight works occasionally
Check for any loose soder points or loose connections with wiring sockets to backlight inverter board.
You only have 3 modules in the back of that unit, the wifi and the sound master board and the video board. Samsung knows they have a issue with some, there is a diagnostic mode that will help you to determine, I would contact tech support before I bought a 350.00 module just to confirm, however I think your on the right track
SOURCE: how to replace the backlight inverter board on Samsung smart tv UN55ES6100F?
If you wish to get some details; visit the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions.
SOURCE: How to fix this unusual problem with Samsung LCD TV 40 Vertical Flipped line
what is the problem that appears after 15 sec?
Also your brand, make, model number will help
Testimonial: "Vertical Flipped line on Samsung LCD LE40c550"
You have wasted enough money guessing bite the bullet and replace the TV. I have done this same thing and regret it to this day, should have just junked it.
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