4. TROUBLE SHOOTING
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Only for training and service purposes
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4.9 Power ON Troubleshooting
The main power source of LGP760 is provided by 2 chips which are TWL6030 and XMM6260 (Communication
processor). Since XMM6260 only powers up normally when OMAP4430 is properly powered therefore, TWL6030
is the actual one to take look at.
Power ON sequence of LGP760 is,
PWR key press
PM_ON_SW goes low (R907, TWL6030 PWRON_ pin(L5))
TWL6030 Power Up
SENSOR_3.0V
VSEL_1.8V (L704)
VSEL_VMEM (L707)
VSEL_2.1V (L705)
VSEL_1.29V (L706)
VPMIC_VCXIO
VSEL_VCORE3 (L703)
VCORE1_OMAP_MPU (L701)
VCORE2_OMAP_IVAUD (L702)
goes high
(if network connected
VSD1_1.3V
VSD2_1.8V)
TWL6030 Power on sequence
External
peripherals
Phoenix Power
Device
OMAP4430
External Power IC:
Enable
LPDDR2:
VDD1
CDC3S04:
VDD_DIG
All peripherals:
1.8v lOs and cores
LPDDR2:
VDD2
External Power IC:
Enable
Phoenix Audio:
TBD
LPPDDR2:
VDDCA, VDDQ
All peripherals:
1.2v lOs and cores
CDC3S04:
IOs
Phoenix Power IC tum
on time up to
REGEN1/2
V1V8
VMEM @ 1.35V or
1.2V wrt boot mode
SYSTEM
V2V1
V2V29@ 1.2V
VCXIO
VCORE3
VCORE1
VCORE2
VDDS_1P8
VDDS_DV_xxx@ 1.8v
VDDA_BG_VBB,
VDD_LDO_SRAM
VDDCA_LPDDR2
VDDQ_LPDDR2
VDD_LDO_EMU_WKUP
VDDS_1P2
VDDS_DPLL, VDDA_DSI
1
/
2
VDDA_CSI2
1
/
2
, VDDA_UNI1,
VDDA_USB1OTG_1P8V,
VDDS_1P8_FREF
VDD_CORE
VDD_DLL0/1_LPDDR21/2
VDD_MPU
VDD_IVA_AUDIO
Power On Event: battery plug, power on button, remote power on, RTC wakeup,
battery Voltage > Vbatmin thresold during charge
7ms(after debounce) - Phoenix intermal power up sequence
VBAT
1.8V
500us
500us
1.35V if Phoenix BOOT1=0or1.2V if BOOT1=1
500us
1.8V
500us
2.1V
500us
1.2V
500us
1
2
3
4
5
6
7
2’
3’
8
9
4.8 Power ON Troubleshooting
The main power source of LGP768 is provided by 2 chips which are TWL6030 and XMM6260 (Communication processor).
Since XMM6260 only powers up normally when OMAP4430 is properly powered therefore, TWL6030 is the actual one to
take look at.
Power ON sequence of LGP768 is,
PWR key press -> PM_ON_SW goes low (R907, TWL6030 PWRON_ pin(L5)) -> TWL6030 Power Up -> SENSOR_3.0V
->VSEL_1.8V (L704) ->VSEL_VMEM (L707) -> VSEL_2.1V (L705) -> VSEL_1.29V (L706) -> VPMIC_VCXIO -> VSEL_VCORE3
(L703) -> VCORE1_OMAP_MPU (L701) -> VCORE2_OMAP_IVAUD (L702) goes high
(if network connected -> VSD1_1.3V -> VSD2_1.8V)