Today, repairing a Skyworth 37L28RM LCD fault is turned on, the green indicator light is on, the whole machine is not responding, the standby button is unchanged, and the voltage of the 5V, 12V, 24V output of the power board is normal, indicating that the motherboard has output the power-on level. Except for the 1.8V voltage of the main chip, the other voltages such as 1.25V, 1.8V, and 3.3V are not output.
The input voltage of these groups of voltages is 5V, which is generated by U28 (DC-DC). The measurement input 12V is normal, and the output voltage is only about 1V. It is obviously abnormal. No obvious problems are found in the road measurement. In order to quickly judge the fault, it is taken. An external 5V voltage test machine is used to adjust the output 5V access circuit with a regulated power supply. The backlight turns on the screen for a few seconds.
Make sure that the rest of the motherboard is normal. The fault is caused by the 5V power supply circuit. Immediately check the U28 power supply circuit. It is found that the voltage of the 1 pin is low at only a few volts. The external resistor and capacitor control the output voltage, and the capacitor C381 is suspected. The welding measurement is actually leaking.
After replacement, the 5V voltage returns to normal troubleshooting. Skyworth 32L28RM (8G20 movement) LCD motherboard drawings.pdf
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