50ln5400 led backlight is out
The backlight for the tv is not turning on per say. when i turn the tv on and off the backlight flashes before the screen can put anything up on it. i can use a flashlight to see the screen as it works. i have replaced the main board on the tv as there is only the tcon, main video connections and power supply. i want to say its the leds but they flash when cycling on/off but then stop. if they were dead wouldnt they just not power at all? the tv was left on all night and was dead in the morning so not sure what happened when it gave out. i would like to know what else i can do. my next step is
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Product Troubleshooting for 50" 5400 Series LED HDTV - 50LN5400
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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.
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.