Hello, this TV is a relatively new platform, certainly new to me. LED backlight connection is unclear to me, appears to be several separate circuits going to the ribbon, instead of the more common 2 wire connection and everything in series.
Anyway the problem is that the TV turns on and works just fine, then after 10 seconds or so the backlight turns off, but you can still make out the picture so the rest is still working. There is some sort of diagnostic LED on the power supply that blinks red 4 times in a loop with pauses after the backlight failure occurs. Couldn't really find what this means. In fact I couldn't find much info about this particular TV at all.
Any directions on where to go? There appears to be a test point on the power supply marked LED+ and GND. The voltage is 45V after plugging the PSU into the mains, then it falls to 42,5V in standby. After turning the unit on, it goes to 87V, LED backlight comes on, works for about 5-10 seconds and then the backlight turns off, but the voltage on this point still stays at 87V and begins to fall off very slowly down to 62,5V and the power supply blinks the diagnostic LED 4 times and repeats it.
I would really like to eliminate all possible causes before disassembling this massive 60 inch panel to get to the LEDs.
I do posses a high voltage LED backlight tester.
Attaching pics of the inside.:
Anyway the problem is that the TV turns on and works just fine, then after 10 seconds or so the backlight turns off, but you can still make out the picture so the rest is still working. There is some sort of diagnostic LED on the power supply that blinks red 4 times in a loop with pauses after the backlight failure occurs. Couldn't really find what this means. In fact I couldn't find much info about this particular TV at all.
Any directions on where to go? There appears to be a test point on the power supply marked LED+ and GND. The voltage is 45V after plugging the PSU into the mains, then it falls to 42,5V in standby. After turning the unit on, it goes to 87V, LED backlight comes on, works for about 5-10 seconds and then the backlight turns off, but the voltage on this point still stays at 87V and begins to fall off very slowly down to 62,5V and the power supply blinks the diagnostic LED 4 times and repeats it.
I would really like to eliminate all possible causes before disassembling this massive 60 inch panel to get to the LEDs.
I do posses a high voltage LED backlight tester.
Attaching pics of the inside.:
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