Power On Troubleshooting - LG -P940 Service Manual

4.9 Power ON Troubleshooting

4.9 Power ON Troubleshooting
The main power source of LGP940 is provided by 2 chips which are TWL6030 and XMM6260 (Communication
The main power source of LGP920 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
processor). Since XMM6260 only powers up normally when OMAP4430 is properly powered therefore, TWL6030
is the actual one to take look at.
is the actual one to take look at.
Power ON sequence of LGP940 is,
Power ON sequence of LGP920 is,
PWR key press PM_ON_SW goes low (R907, TWL6030 PWRON_ pin(L5))
PWR key press PM_ON_SW goes low (R1195, TWL6030 PWRON_ pin(L5))
VSEL_1.8V (L803)
SENSOR_3.0V SENSOR_3.0V VSEL_1.8V (L704)
VPMIC_VCXIO VSEL_VCORE3 (L802)
VPMIC_VCXIO VSEL_VCORE3 (L703)
VCORE2_OMAP_IVAUD (L801) goes high
high
(if network connected
(if network connected
External
peripherals
External Power IC: Enable
LPDDR: VDD1
CDC3S04: VDD_DIG
All peripherals: 1.8v lOs and cores
LPDDR: VDD
External Power IC: Enable
Phoenix Audio: TBD
LPPDDR: VDDCA, VDDQ
All peripherals: 1.v lOs and cores
CDC3S04: IOs
LGE Internal Use Only
VSEL_VMEM (L806)
VSEL_VMEM (L707)
VCORE1_OMAP_MPU (L701)
VSD1_1.3V VSD2_1.8V)
VSD1_1.3V VSD2_1.8V)
Phoenix Power
OMAP4430
Device
Phoenix Power IC tum
on time up to
REGEN1/
VDDS_1P8
VDDS_DV_xxx@ 1.8v
V1V8
VDDA_BG_VBB,
VDD_LDO_SRAM
VMEM @ 1.35V or
1.V wrt boot mode
SYSTEM
VV1
VDDCA_LPDDR
VDDQ_LPDDR
VDD_LDO_EMU_WKUP
VV9@ 1.V
VDDS_1P
VDDS_DV_xxx@1.V
VDDS_DPLL, VDDA_DSI
VCXIO VDDA_CSI
VDDA_USB1OTG_1P8V,
VDDS_1P8_FREF
VDD_CORE
VCORE3
VDD_DLL0/1_LPDDR1/
VDD_MPU
VCORE1
VCORE VDD_IVA_AUDIO
TWL6030 Power on sequence
TWL6030 Power on sequence
VSEL_2.1V (L804)
VSEL_2.1V (L705)
VCORE1_OMAP_MPU (L800)
VCORE2_OMAP_IVAUD (L702) goes
Power On Event: battery plug, power on button, remote power on, RTC wakeup,
battery Voltage > Vbatmin thresold during charge
1
7ms(after debounce) - Phoenix intermal power up sequence

VBAT
3
500us
'
3'
1 /

1 / , VDDA_UNI1,

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4. TROUBLE SHOOTING
TWL6030 Power Up
TWL6030 Power Up
VSEL_1.29V (L805)
VSEL_1.29V (L706)
1.8V
4 500us
1.35V if Phoenix BOOT1=0or1.V if BOOT1=1
5
500us
1.8V
500us
6
.1V
500us
7
Only for training and service purposes
1.V
8
500us
9