Dell 915 User Manual

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

DB1 (Barbados) Power

Insert AC adapter only, Sequence then without press power

button

PS_ID

U6, MAX1909 will check AC and battery power

PWR_SRC

VCCRTC is generated by U53 MAX1615

through D30

VCCRTC

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.

U49 wwwMacallen.kythuatvitinh3 will ou put ALWON to MAX8734A to turn on +3VALW and +5VALW.com

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

+5VALW

Digitally signed by fdsf DN: cn=fdsf, o=fsdfsd, ou=ffsdf, email=fdfsd@fsdff, c=US

Date: 2010.02.15 08:09:22 +07'00'

+3VALW

32 K Hz
	Macallen
	Go!
	If Macallen is working.
	DBG2 pin2 will have
Q: If no debug out pulse? 1,2,3,4 pulse when AC
1. Macallen.	adapter
2. BIOS ROM.	attached( DEBUG_OUT )

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

Insert AC adapter only, then press power

button

POWER_SW#

DB1 (Barbados) Power

Sequence

After +3VALW , +5VALW, DEBUG_OUT were all come out. Macallen should assert SUS_ON.

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.

SUS_ON

SUS_ON will turn on MAX8734A producing +5VSUS , +3VSUS.

SUSPWROK_5V

www.kythuatvitinh.com

U46,MAX8743 will	U38,TPS51116 will
produce +1.5VSUS	produce +1.8VSUS.

+1.5VSUS

SUS_ON

Check All SUS power planes are in correct voltage level?

Delay

10ms

+1.8VSUS_PG

+1.8VSUS

U50 pin 8

SUSPWROK