TCL LCD TV L40E9FBD: Blue Light Not Working - Repair Process. After disassembling the power supply section and replacing all capacitors, the power output voltages (5V, 12V, 24V) were found to be within normal ranges. Next, we checked the motherboard's U805 regulator block, where the 1.8V output was normal, but the 3.8V power supply showed waveform abnormalities. After identifying the issue, we replaced the 16V 330µF capacitor (as shown in the photos below), which successfully resolved the problem.
This repair case highlights the importance of checking voltage stability and component integrity when dealing with backlight or power-related issues in TVs. The replacement of a single faulty capacitor can often restore full functionality. It’s always recommended to perform a thorough inspection after replacing capacitors, as other components may also be affected by aging or electrical stress.
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