In the morning, the rain is still going underground. A customer drove a Haier TV to repair, put the TV on the table and said only one thing: "Can't open the machine", and left. I was forgotten to leave the customer's phone because I was busy repairing the washing machine.
In the afternoon, when I plugged in the TV, the indicator light was on, and the boot did not respond. The touch button also fails and the screen does not light up.
Remove the cover and check that the voltage of the power board is normal. It is suspected that the motherboard is broken.
Test P-ON boot voltage is 0V, then remove the motherboard, measure the motherboard power supply voltage has 5V. The voltage regulator AZ1084S has only 2V voltage at the input end, which is abnormal. The circuit, there are two diodes to limit the pressure, the first M4 is measured, there is 5V coming in, and only 2V is going out. The resistance value of the power-off is more than 20 K in the forward direction. Remove the diode and install it with the new M4. After power-on, the M4 output is measured to rise to 4.8V. Test the AZ1084S into the 4.5V, press the power button, then the backlight is also lit.
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