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Tag Lenovo Y400

Lenovo Y400 schematic diagrams, boardview, BIOS, repair resources free download. Repair guides & tips, repair tutorials, repair manuals for Lenovo Y400, learn how to repair your Lenovo Y400.

Lenovo y400 notebook boot no response maintenance

660;IMG_262
Quickly dismantle the machine, first dry the standby 3 / 5V in the figure below, open the control MOSFET and force it on.Measure the standby 3 / 5V VCC OK, then test the standby and reset of EC, and then check the EC reset is low, and hit 3V linear waveform.The fault caused by the 3V line current of change has been eliminated, and then the 3 / 5V is also current of change. First, disconnect the 3 / 5V isolation point, and then turn off the 3 / 5V. Finally, replace the two pairs of MOSFET of 3 / 5V and power on booting up to remove the fault.