TCL LCD TV L40E9FBD: Blue Light Not Turning On – Fault Repair. After disassembling the power supply section and replacing all capacitors completely, the power output was tested and found to be within normal ranges (5V, 12V, and 24V). The motherboard was checked, specifically the U805 regulator block, where the 1.8V output was normal, but the 3.8V power supply showed waveform abnormalities. After replacing the 16V 330µF capacitor (see photo below), the issue was resolved.
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