Daniel melkamu
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sir 7020 motherboard start with no led after pressing the button at the back of power supply for a few secs then stop what could be the issue?
Technical Support dell 7020
- Thread starter Daniel melkamu
- Start date
Take the voltage from the input jack and see which stage the voltage is available.
Usually, 19 volts enters the sense resistor after passing through two MOSFETs, and the rest of the board voltages are made from this voltage.
If the voltage of 19 volts is available, the LDO voltage must first be generated by the IC power and enter the IC, and the AC will start giving the command to generate voltages of 3.3 volts and 5.1 volts.
Usually, 19 volts enters the sense resistor after passing through two MOSFETs, and the rest of the board voltages are made from this voltage.
If the voltage of 19 volts is available, the LDO voltage must first be generated by the IC power and enter the IC, and the AC will start giving the command to generate voltages of 3.3 volts and 5.1 volts.
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