Intel DG31PR Case3
Posted: Fri Dec 22, 2017 3:56 pm
Problem = no display
Vcore voltage was missing but all other voltages are okay. Checked Vcore ic NCP5387 voltages. IC pin no 1 is enable input which should be 1.2 volt. However it was showing zero volt due to an open input resistor. Before replacing the resistor i checked the output side of the resistor and found a ceramic bypass capacitor as leaky. The leaky capacitor was the real reason for the resistor to became open. Replaced both components. Vcore came and display came.
Vcore voltage was missing but all other voltages are okay. Checked Vcore ic NCP5387 voltages. IC pin no 1 is enable input which should be 1.2 volt. However it was showing zero volt due to an open input resistor. Before replacing the resistor i checked the output side of the resistor and found a ceramic bypass capacitor as leaky. The leaky capacitor was the real reason for the resistor to became open. Replaced both components. Vcore came and display came.