Circuit Power On Trouble Shooting - LG -P895 Service Manual

5.1 Circuit Power ON trouble Shooting

4.9 Circuit Power ON trouble Shooting
The main power source of LGP895 is provided by MAX77663.
The main power source of LGP895 is provided by MAX77663.
Power ON sequence of LGP895 is,
Power ON sequence of LGP895 is,
PWR key press  PWR_ON_KEY go to low (VA102)  MAX77663 Power Up  +1V2_TPS_VRTC (C5014) 
PWR key press -> PWR_ON_KEY go to low (VA102) -> MAX77663 Power Up -> +1V2_TPS_VRTC (C5014) -> +1V2_
+1V2_TPS_VCORE (C5023)  +1V8_TPS_AVDD_OSC(C5015)  AP_32K_CLK_IN(R5015)
TPS_VCORE (C5023) -> +1V8_TPS_AVDD_OSC(C5015) -> AP_32K_CLK_IN(R5015) ->+1V2_TPS_VDDR(C5028),
+3V3_TPS_VUSB(C5010) -> +1V8_TPS_VIO(C5027) -> GPS_32K_CLK_IN, WLAN_32K_CLK_IN (R5036) ->+1V2_TPS_
+1V2_TPS_VDDR(C5028), +3V3_TPS_VUSB(C5010)  +1V8_TPS_VIO(C5027)  GPS_32K_CLK_IN,
VPLL(C5008),+1V0_TPS_VDDRHS(C5009) -> +2V85_TPS_VMEM(C5011) , AP_VBUS_DET(R5030) ->AP_SYS_RESET_N
WLAN_32K_CLK_IN (R5036)+1V2_TPS_VPLL(C5008),+1V0_TPS_VDDRHS(C5009) 
(R5008) goes to high
+2V85_TPS_VMEM(C5011) , AP_VBUS_DET(R5030) AP_SYS_RESET_N (R5008) goes to high
Note : LID &
ACOK has no
debounce time.
EN0
LD04=1.2V
(VDD_RTC)
SD1=1.2V
(VDD_CORE)
LD06=1.8V
(AVDD_OSC,
USB_PLL,
HDMI_PLL)
32K_OUT
SD3=1.2V
(VDDIO_DDR)
LDO2=3.3V
(AVDD_USB,AVDD_HDMI)
SD2=1.8V
(VDDIO_XXX)
GPIO4 (32K_OUT1)
LDO0=1.2V
(AVDD_PLLA_P_C)
LDO1=1.0V
(VDD_DDR_HS)
LDO5=2.8V
(VDD_DDR_RX)&
GPIO1=VBUS_DET
nRST_IO
(SYS_RESET_N)
LGE Internal Use Only
30ms debounce filter
(Td)
1.28ms
1.28ms
1.28ms
1.28ms
1.28ms
Power-OFF in reverse order.
1.28ms
36 msec
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4. TROUBLE SHOOTING
Only for training and service purposes