Dell 915 User Manual

Insert AC adapter only,

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then without press power

button

DB1 (Barbados) Power

Sequence

If AC type is un-know or
battery can not be
charged, you can check
PS_ID relate circuit.

PS_ID

U6, MAX1909 will check AC and

battery power

PWR_SRC

VCCRTC is generated by U53

MAX1615

through D30

VCCRTC

U49

Power Plan:

0. RTC power plane.

1. Always power plane.

2. SUS power plane.

3. RUN power plane.
ACPI Power State:

1. S0: System Full On, All power planes are ON.

2. S3: Suspend to RAM, RUN power off.

3. S4: Suspend to Disk, RTC and Always power
ON.(AC)

4. S5: Soft Off, power state like S4.

Macallen 3 will output ALWON to MAX8734A to turn on +3VALW and +5VALW

If no ALW power, what
should we do?
A: Check charger
MAX1909 ACAV_IN relate
circuit.

ALWON

U13,MAX8734A will have +3VALW and +5VALW power output on pin25 and pin 18

+3VALW

+5VALW

32 K Hz

Macallen

Go!

If Macallen is working.
DBG2 pin2 will have

Q: If no debug out pulse?

1. Macallen.

2. BIOS ROM.

1,2,3,4 pulse when AC
adapter
attached( DEBUG_OUT )

When +3VALW is reach
3V,VCC1_PWROK is
output high, this signal
also reset Macallen3
internally.

Insert AC adapter only, then

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press power

button

POWER_SW#

DB1 (Barbados) Power

Sequence

After +3VALW , +5VALW,

DEBUG_OUT were all come out.

Macallen should assert SUS_ON.

SUS_ON

SUS_ON will turn on MAX8734A

producing +5VSUS , +3VSUS.

SUSPWROK_5V

U46,MAX8743 will

produce +1.5VSUS

If Macallen do not driven SUS_ON high

1. Re-heat Macallen.

2. Change one new Macallen.

3. Still no SUS_ON, check BIOS ROM.

U38,TPS51116 will

produce +1.8VSUS.

+1.5VSUS

Check All SUS power planes
are in correct voltage level?

SUS_ON

U50 pin 8

SUSPWROK

Delay
10ms

+1.8VSUS

+1.8VSUS_PG