HP 500 Laptop Power Supply For CPU Diagram And Failure Analysis

1, PU9 (MAX1532) Power control IC, if damaged, will auto shut down, or system halted, or can not boot, or led lights but can not start up. If it pseudo soldering, will be often reboot or auto shut down.

2, PQ21, PQ25 mosfet, if they damaged, will auto shut down after boot, or the fan spin for an instant and shut down. If one mosfet damaged, will auto shut down when run a big program.

3, PQ22, PQ26 mosfet, if damaged, the led will flicker one time when press the power button, then shut down. Or auto shut down after boot.

4, PC85, PC115 Filter capacitor, if short circuit, will not able to charge, and can not boot, too.

5, PC94, PC95, PC285, PC286 Filter capacitor, if damaged, will not be able to boot or system halted.

6, PL12, PL13 inductor, if pseudo soldering, will generate cheep noise when boot.

7, PR104 resistor, if pseudo soldering, will not able to boot....read more