When a CPU motherboard shows no display despite powering on, the RAM's VPP voltage circuit may be faulty; by simulating the correct VPP voltage (2.5V) using a bench power supply, one can confirm whether the MP1475 IC is defective and needs replacement.
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Cpu Motherboard No Display - Simulating VPP Voltage #cpu #display #blackscreen #ram追加:
This PC turns on, but there's no display. After checking, I found that the RAM's VPP voltage is missing. Let's take a closer look. This PL7 is the circuit that supplies the RAM's VPP voltage. As you can see here, the voltage is only 0.08 volt. And here is the VIN voltage for the MP1475 IC currently measuring at 5 V. And here the voltage for the enable pin reads 4.5 volts. But the IC is still not working.
I think this IC is faulty. But before we replace it, let's simulate the VPP voltage using a bench power supply. So I'm going to inject 2.5 volts right here. And let's power on the motherboard. As you can see on the power supply, the current is starting to ramp up. And there we go. We got a picture on the
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