IBM Thinkpad T20 T21 T22 Schematic Power Sequence

Post on 22-Oct-2015

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Transcript of IBM Thinkpad T20 T21 T22 Schematic Power Sequence

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Note.1

VCCSW (5V) at page 59 at this point U81 get ready it will setup signal

-pwrshutdown High, -pwron High, -POWEROFF High ,-PWRSW_EVENT High

and waiting for power on.

Note.2

LCD PANEL POWER control need check the Panel spec.

Note.1

VCCSW (5V) at page 59 at this point U81 get ready it will setup signal

-pwrshutdown High, -pwron High, -POWEROFF High ,-PWRSW_EVENT High

and waiting for power on.

Note.2

LCD PANEL POWER control need check the Panel spec.

Note

WHEN AC POWER IS PLUG IN U81 WILL SETUP FOLLOWING SIGNAL

VCC3M_ENABLE,V5ON,VCC3AUX_ON, and Turn onVCC3M,VCC5M,VCC3AUX make the H8(U12) work to monitor SYSTEM status

like BATTERY.

Note

WHEN AC POWER IS PLUG IN U81 WILL SETUP FOLLOWING SIGNAL

VCC3M_ENABLE,V5ON,VCC3AUX_ON, and Turn onVCC3M,VCC5M,VCC3AUX make the H8(U12) work to monitor SYSTEM status

like BATTERY.