IBM Thinkpad T20 T21 T22 Schematic Power Sequence
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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.