Hello. I have an led tv here that I am trying to troubleshoot. When plugged in the standby light goes red, if I press the power button the light turns off then back on within less than a second. This tv has a power board integrated into the motherboard, so replacing components just to diagnose is a bit expensive. It was taken to a repair shop, and they said it was the LED strips, but they did not have them in stock so gave it back.
I normally would doubt that LED strips would cause a no power situation, but I have never come across a board like this. Maybe the led controller detects bad leds (open circuit) before turning on?
I can't seem to find any missing voltages around the motherboard side. There are 3.3v, 1.2v, 1v. THe power supply outputs two different voltages, 12v that goes towards the motherboard side, and around 130v that goes directly into the led strips. Both are present while plugged in.
Now if the led strips are plugged into their positive voltage terminal, and the negative sides are disconnected, I should see a voltage difference between these loose wires (LED negatives) and common ground right? Because there is no voltage, what seems like an open circuit on both LED strips (this model has two strips).
Any ideas? Does this model somehow verify LEDs before turning on?
I normally would doubt that LED strips would cause a no power situation, but I have never come across a board like this. Maybe the led controller detects bad leds (open circuit) before turning on?
I can't seem to find any missing voltages around the motherboard side. There are 3.3v, 1.2v, 1v. THe power supply outputs two different voltages, 12v that goes towards the motherboard side, and around 130v that goes directly into the led strips. Both are present while plugged in.
Now if the led strips are plugged into their positive voltage terminal, and the negative sides are disconnected, I should see a voltage difference between these loose wires (LED negatives) and common ground right? Because there is no voltage, what seems like an open circuit on both LED strips (this model has two strips).
Any ideas? Does this model somehow verify LEDs before turning on?
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