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Work Hours
Monday to Friday: 7AM - 7PM
Weekend: 10AM - 5PM
Lenovo Xinchao 7000-13 laptop no booting maintenance
Machine model: Lenovo xiaoxinchao 7000-13 notebook
Fault phenomenon: notebook no booting
Maintenance process:
Lenovo Xinchao 7000-13, plug-in adjustable power on no power on, no standby.Remove the back cover, unplug the COMS battery and power on again later. The fault is still the same.
After measuring the whole motherboard Inductor, there was no obvious Short circuit. After power on measurement, it was found that there was no 3v5v. After looking for the drawing, it was found that the Current protection isolation tube of this machine was n-tube. The physical measurement was found on the board.
Lenovo Xinchao 7000-13 laptop no booting maintenance Figure 1
Follow Boardview.
Lenovo Xinchao 7000-13 laptop no booting maintenance Figure 2
Lenovo Xinchao 7000-13 laptop no booting maintenance Figure 3
Find out that the physical measurement is normal, and the first MOSFET is not completely connected. Check which chip controls the G pole of the isolated Current protection tube.Continue to track down the charging chip 1 pin, there is no VCC, measuring resistance Diode value is normal,Capacitor is normal, diode is wrong, positive and negative are 580.
Lenovo Xinchao 7000-13 laptop no booting maintenance Figure 4
Replace d5901, the plug-in current is out, but DC power supply, the current lamp flashes or short.
Lenovo’s new maintenance notebook no booting
After Measuring diode value, it was found that the whole board Inductor was still normal without obvious Short circuit.On the forum to learn experience, some people say it is the screen interface Short circuit.
Lenovo Xinchao 7000-13 laptop no booting maintenance Figure 6
Measure the board is not short, look around and find this position is Short circuit.
Lenovo Xinchao 7000-13 laptop no booting maintenance Figure 7
Take down Capacitor, measure it is Short circuit, and then power on the current,Normally booting up.
Lenovo Xinchao 7000-13 laptop no booting maintenance figure 8