Repair Skyworth LCD TV 42E500E, movement 8R57, the fault is that the power-on indicator is on, the screen is on and off, and the Speaker is accompanied by a fluttering sound that illuminates the same rhythm with the screen. When the machine is disassembled, the backlight is constantly on and off. There is no abnormality in visual inspection. When the fault occurs, the 5V, 12V, 24V and open standby voltages of the power supply board are stable, indicating that the power supply board is normal, and then the three voltage regulator blocks on the motherboard are tested. The U18 output is 1.8V stable, and the U19 output is 5V stable. U24 output 3.3V is obviously low and still decreasing, but the input 5V is stable. There is no obvious abnormality in the output of the output pin to ground resistance. Find a fixed output 3.3V regulator block and replace it with 1 Grounding of the foot (the original voltage regulator block is adjustable voltage regulation, 1 foot is grounded through the resistor), and the test machine is all normal. Attach photos and drawings for your reference. The fault picture is flashing, not good, so No shot
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