@jdegregz disconnect the main board from the power board. That should turn your back lights on. If your back lights do not come on then the issue is most likely a bad backlight array. This TV set is very known to have bad LED's. Turn the TV on and measure the VDC of the BLon pin on the PSU, in order to make sure the main board is actually turning on the back lights. Measure the voltages on your power supply leading to the backlight LED’s and let us know what you get. DC voltages can be high so set your meter to around 5-600 V scale and black probe to ground.
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@jdegregz disconnect the main board from the power board. That should turn your back lights on. If your back lights do not come on then the issue is most likely a bad backlight array. This TV set is very known to have bad LED's. Turn the TV on and measure the VDC of the BLon pin on the PSU, in order to make sure the main board is actually turning on the back lights. Should be pin 5 on CNM803 (somewhere in the 4V range to turn BL on) Measure the voltages on your power supply leading to the backlight LED’s and let us know what you get. DC voltages can be high, so set your meter to around 5-600 V scale and black probe to ground.
@jdegregz disconnect the main board from the power board. That should turn your back lights on. If your back lights do not come on then the issue is most likely a bad backlight array. This TV set is very known to have bad LED's. Turn the TV on and measure the VDC of the BLon pin on the PSU, in order to make sure the main board is actually turning on the back lights. Measure the voltages on your power supply leading to the backlight LED’s and let us know what you get. DC voltages can be high so set your meter to around 5-600 V scale and black probe to ground.
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