TPS51220A QFN-32 Power IC

http://www.htic-tool.com/tps51220a-qfn32-power-ic-p-1650.html

TPS51222 QFN-32 Power Controller IC

http://www.htic-tool.com/tps51222-qfn32-power-controller-ic-p-1651.html

HP 500 Laptop Clock Circuit Diagram And Failure Analysis

1, U28(ICS 954226) clock chip, if damaged, it will not respond when press the power button. Or auto reboot, or auto power off after led light. If 954226 pseudo soldering, will be able to boot sometimes, can not boot sometimes.  

2, L31, L32 inductor, if damaged or pseudo soldering, it will not respond when press the power button, or auto power off.

3, X1 crystal oscillator, if damaged, will not able to boot.

4, C428, C431 resonant capacitor, if electric leakage or damaged,...read more

TPS51218DSCR PIZI QFN-10 Power IC

http://www.htic-tool.com/tps51218dscr-pizi-qfn10-power-ic-p-1649.html

TPS51211 QFN-10 Power IC

http://www.htic-tool.com/tps51211-qfn10-power-ic-p-1648.html

UCC3804N DIP-8 PWM IC

http://www.htic-tool.com/ucc3804n-dip8-pwm-ic-p-1647.html

HP 500 Laptop Power Supply For Chipset Diagram And Failure Analysis

1, PU8(MAX8743) power control chip for chipset, if damaged, will not able to boot, or the fan rotations but cannot boot. Or auto power off after work for a period of time, or chipset very hot.

2, PQ20 mosfet, if damaged, will auto power off after work for a period of time, or cannot boot.

3, PL9 inductor or PC71 capacitor, if pseudo soldering, will auto power off after boot....read more