HP WF1907 Service Manual page 9

supplies according to the sequence show below.
Power Key
LED Blue
PANELVCC_E
N
BKLT_EN
AUDIO_EN
3.8.4 Power OFF sequence
When the POWER key switch is pressed, while the power supply is ON, the POWER key
switch signal is turned "H". When this "H" potential is detected, the CPU begins to turn off
the respective power supplies according to sequence show below.
Power Key
LED Blue
PANELVCC_E
N
BKLT_EN
AUDIO_EN
296ms
516ms
825ms
3.68s
140ms
157ms
140ms
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460ms