M81C
Board-Level Trouble Shooting Guide
M81C
Board-Level Trouble Shooting Guide
System Overview
System Overview
Bottom
Volume Up
Volume Down
Rear Camera
Power key
Speaker
Hall Sensor
AMIC
SD Conn.
Battery Conn.
Audio Jack
Micro USB
WiFi BT GPS Antenna
Intel SOC
Front Camera Conn.
Rear Camera Conn
G Sensor
EMMC
Codec ALC5640
PMIC BD2610GW
GPS IC
Side Key Conn.
BCM43340XKU
BG(Wifi BT IC)
E-Compass Sensor
Intel SOC
Speaker Conn.
Touch Conn.
LCM Conn.
LPDDR3
8M BIOS
EC IT8568.
Touch IC
CHARGER IC
Gauge IC
Rear 2M and 5M
Block Diagram
SPEAKER
SPO
EXT
MIPI-CSI 2 1X
MIPI-CSI 1 2X
I2C 2
BLOCK
I2C5
I2C 3
MIPI-DSI
1x64b
SDXC
eMMC4.41
SDIO V3.0
Atom
Processor
Bay trail-T
Intel
DDR3L
LPDDR3 PANEL
FRONT CAM
REAR CAM
TOUCH
EMMC FLASH
SD CARD
WIFI+BT
GPS
HS UART
I2S0
26MHz
37.4MHz
I2S1
I2S2
AMIC AUDIO
SPEAKER
SPO
HPHONE
HP
EXT
Amp
MIPI-CSI 2 1X
MIPI-CSI 1 2X
I2C 2
I2C0
BLOCK
I2C5
SPI
SENSOR
SPI ROM/8MB
Gauge
SMBUS2
Charger
I2C 3
MIPI-DSI
1x64b
SDXC
eMMC4.41
SDIO V3.0
SVID
RTC
I2C4
Atom
Processor
Bay trail-T
Intel
I2C6
25 MHz
DDR3L
LPDDR3 PANEL
FRONT CAM
REAR CAM
TOUCH
EMMC FLASH
SD CARD
WIFI+BT
GPS
PMIC
HS UART
I2C1
I2S0
PMU/GPIO
EC
26MHz
32.768KHZ
37.4MHz
I2S1
Power On Sequence(BD2610GW)
Voltage Table
power
Voltage（V)
power
Voltage（V)
+V1P0A
1
+V1P8U
1.8
+VDDQ_VTT
1
+3VSUS
3.3
+V3P3A
3.3
VDD_1V8_GEN
1.8
+V1P8A
1.8
+LCD_1V8
1.8
+V1P8SX
1.8
V+LCD_3V3
3.3
+V1P8S
1.8
AVDD28_GTP_3V3
3.3
+V1P2A
1.2
+CAM_2M_VDDIO_1V8
1.8
+V2P85S
2.8
+CAM_2M_AVDD_2V8
2.8
+V2P85SX
2.8
+CAM_5M_VDDIO_1V8
1.8
+VDDQ
1.2
+CAM_5M_AVDD_2V8
2.8
+V1P2S
1.2
V+CAM_5M_VCM_2V8
2.8
+V1P2SX
1.2
V+VCORE_EMMC
2.8
+V1P05S
1.05
+VDDIO_EMMC
1.8
+V5P0S
5.0
+VDD_SDIO
3.3
+V1P0S
1.0
DBVDD_1V8
1.8
+V1P0SX
1.0
AVDD_1V8
1.8
+V3P3SX
3.3
DACREF_1V8
1.8
+V3P3S
3.3
CPVDD_1V8
1.8
System Power Tree
+3.3V
Buck BOOST
+1.0V
BUCK
+1.8A
BUCK
FET
Switch
FET
Switch
+V1P8U
+V1P8U_LPDDR3
+V1P0A
LINEAR
VR
+V1P8SX
+CAM_2M_VDDIO_1V8
+CAM_5M_VDDIO_1V8
+V3P3S
+LCD_3V3
V_LEDVSYS/VBATA
SPKVDD
HALL_PWR
+VDD_SDIO
+VUSB_PHY
AVDD28_GTP_3V3
GPS_VDD_IO_1V8
+V3P3SX
FET
Switch
SWIT CH
PMIC
+VSDIO
5V ADAPTER
Charge
Switch
CHAR GE
MOSFET
MOSFET
MOSFET
MOSFET
COMPASS
Panel
SPEAKER
Panel
SDCARD
TOUCH
LPDDR3
GPS
GPS
CAMERA
+V1P0SX_S
VDD_COM
SOC
SOC
SOC
SOC
DDR CA PU
SOC
IO/USB MUX/SOC
SOC
XDP/PHY/IO/SOC
SOC
MOS
BAT
VBATSENSE
+VDDQ_VTT
+V1P8A
+V3P3A
+V1P0SX
GPS_VDD_BAT_3V3
+V1P0S
+5V
BOOST
+2.85V
Buck Boost
+3.3V
Buck BOOST
+1.0V
BUCK
+1.24V
BUCK
+1.8A
BUCK
FET
Switch
+1P05V
BUCK
FET
Switch
FET
Switch
FET
Switch
LINEAR
VR
FET
Switch
FET
Switch
SVID
BUCK
+VDDQ_LPDDR3
SVID
BUCK
+V1P8U
+V1P8U_LPDDR3
+CAM_2M_AVDD_2V8
+V1P0A
+V2P85SX
LINEAR
VR
+V1P8SX
+CAM_2M_VDDIO_1V8
+CAM_5M_VDDIO_1V8
+V3P3S
+LCD_3V3
+LCD_1V8
V_LEDVSYS/VBATA
DBVDD_1V8
BACK BAT
AVDD_1V8
DACREF_1V8
CPVDD_1V8
SPKVDD
BAT_COINCELL
VDD_GYRO /VDDIO_GYR O
+V2P85S
HALL_PWR
+VREF_DQ0
+VDD_SDIO
+VUSB_PHY
+VDDIO_EMMC
+VREF_DQ1
+VCORE_EMMC
AVDD28_GTP_3V3
VDDIO_QTP
LINEAR
VR
GPS_VDD_IO_1V8
LINEAR
VR
+V3P3SX
FET
Switch
SWIT CH
PMIC
+VSDIO
5V ADAPTER
Charge
Switch
CHAR GE
MOSFET
MOSFET
MOSFET
MOSFET
MOSFET
+VCLK_SFR1
+V_SFR1
COMPASS
Panel
SPEAKER
Panel
Panel
SDCARD
TOUCH
LPDDR3
GPS
GPS
CAMERA
AUDIO
G-SENSOR
LPDDR3
SOC
SOC
CAMERA
CAMERA
CAMERA
EMMC
TOUCH
+V1P0SX_S
VDD_COM
SOC
SOC
SOC
SOC
DDR CA PU
SOC
IO/USB MUX/SOC
SOC
XDP/PHY/IO/SOC
DEBUG/IO/SOC
SOC
SOC
SOC
SOC
SOC
SOC
SOC
SOC CORE
SOC UNCORE
POWER
DEVICE/IC
SOC
MOS
COMPASS
VID_COM
BAT
VBATSENSE
+VDDQ_VTT
+V1P2A
+V1P8A
+V3P3A
+V1P0SX
GPS_VDD_BAT_3V3
+V1P2SX
+V1P0S
+V1P05S
+V1P2S
+V1P8S
+CAM_5M_AVDD_2V8
+V_VCC
+V_VNN
+VDDQ
+CAM_5M_VCM_2V8
+V5P0S
Trouble Shooting - MB
Trouble Shooting - MB
Trouble Shooting – No Boot
• check if side key is plug as well
• Check if battery voltage (BAT) is higher than 3.4V
• Check if VSYS has voltage output
• Check if each power domain of PMIC output normally
• check if side key is plug as well
• Check if battery voltage (BAT) is higher than 3.4V
• Check if VSYS has voltage output
• Check if each power domain of PMIC output normally
• Mechanically turn off the device and check if any
power domain of PMIC is short to GND
• Reheat or replace PMIC
• Reheat or replace SOC
Trouble Shooting – eMMC Fail
• Check if +VCORE_EMMC is 3.3V
• Check +VDDIO_EMMC is 1.8V
• Check if eMMC interface works normally
• Reheat or replace eMMC (U2301)
• Check if +VCORE_EMMC is 3.3V
• Check +VDDIO_EMMC is 1.8V
• Check if eMMC interface works normally
• Reheat or replace eMMC (U2301)
• Reheat or replace SOC
Trouble Shooting – USB Fail
• Check if CON3101 is welding normal
• Check if USBCON_PP and USBCON_PN short circuit
• Check if when plug in USB device the VSYS_5V_HD0
have 5V
• Check if CON3101 is welding normal
• Check if USBCON_PP and USBCON_PN short circuit
• Check if when plug in USB device the VSYS_5V_HD0
have 5V
• Check if when plug in USB device the USB1_ID have
0V and plug out USB device the USB1_ID have 3.3V
• Reheat or replace SOC
Trouble Shooting – Rear CAM Fail
• Check if Rear Camera Module is properly assembled
• Replace Rear Camera Module and check if it work
normally
• Check if +CAM_5M_VDDIO_1V8 has 1.8V supply
• Check if Rear Camera Module is properly assembled
• Replace Rear Camera Module and check if it work
normally
• Check if +CAM_5M_VDDIO_1V8 has 1.8V supply
• Check if +CAM_5M_AVDD_2V8 has 2.8V supply
• Check if 5M_CAM_PD#_R is driven to 1.8V
• Check if I2C3_SDA/SCL works normally
• Reheat or replace SOC
Trouble Shooting – Front CAM Fail
• Check if Front Camera Module is properly assembled
• Replace Front Camera Module and check if it work
normally
• Check if +CAM_2M_VDDIO_1V8 has 1.8V supply
• Check if Front Camera Module is properly assembled
• Replace Front Camera Module and check if it work
normally
• Check if +CAM_2M_VDDIO_1V8 has 1.8V supply
• Check if +CAM_2M_AVDD_2V8 has 2.8V supply
• Check if CAM_2M_RESET_N is driven to 1.8V
• Check if I2C2_SDA/SCL works normally
• Reheat or replace SOC
Trouble Shooting – LCM No Display
• Check if LCM FPC is properly assembled
• Replace LCM FPC and check if it work normally
• Replace LCM and check if work normally
• Check if P_MIPI_DATA0~DATA3 and P_MIPI_CLK is
• Check if LCM FPC is properly assembled
• Replace LCM FPC and check if it work normally
• Replace LCM and check if work normally
• Check if P_MIPI_DATA0~DATA3 and P_MIPI_CLK is
work normally
• Check if V_LED is 8~9V
• Check if PANEL_3V3_EN and PMIC_BK_EN is high
• Check LCM_BL_PWM pulse signal output
• Reheat or replace SOC
Trouble Shooting – SD Card Fail
• Check if SD Card Socket (CON2401) works properly
• Insert SD card, check if SDIO_0_CD# is pulled low
• Check if SDIO_PWR_EN_N is driven to high
• Check if when plug in SD the SDMMC3_CD_N_R is pulled
• Check if SD Card Socket (CON2401) works properly
• Insert SD card, check if SDIO_0_CD# is pulled low
• Check if SDIO_PWR_EN_N is driven to high
• Check if when plug in SD the SDMMC3_CD_N_R is pulled
low ,and plug out SD the SDMMC3_CD_N_R is pulled high
• Check +VDD_SDIO has 3.3V supply
• Check if SDMMC3 interface works normally
• replace CON2401
• Reheat or replace SOC
Trouble Shooting – Headphone Fail
• Check if headphone jack (CON2603) works properly
• Insert headphone, check if HP_DET# is pulled low
• Check if codec has DBVDD_1V8 ,AVDD_1V8 ,
DACREF_1V8, CPVDD_1V8 power
• Check if headphone jack (CON2603) works properly
• Insert headphone, check if HP_DET# is pulled low
• Check if codec has DBVDD_1V8 ,AVDD_1V8 ,
DACREF_1V8, CPVDD_1V8 power
• Check if HP_OUT_L/R has output (Codec: U2501)
• Check if I2C2_SCL/SDA and I2C0_SCL/SDA works
normally
• Reheat or replace Codec
• Reheat or replace SOC
Trouble Shooting – AMIC Fail
• Check if headphone and speaker works properly
• Check if U2602, L2610and L2611 is OK
• Check if MICBIAS has 2.7V supply (Codec)
• Check if AMIC_P has signal input
• Check if headphone and speaker works properly
• Check if U2602, L2610and L2611 is OK
• Check if MICBIAS has 2.7V supply (Codec)
• Check if AMIC_P has signal input
• Check if codec has DBVDD_1V8 ,AVDD_1V8 ,
DACREF_1V8, CPVDD_1V8 power
• Check if I2C2_SCL/SDA and I2C0_SCL/SDA works
normally
• Reheat or replace Codec
• Reheat or replace SOC
Trouble Shooting –Speaker Fail
• Check if upper speaker is properly assembled
• Replace speaker and check if the failure is fixed
• Check if SPO_LP/N, SPO_RP/N has signal output
• Check if SPKVDD is 3.4V~4.35V (VBATA)
• Check if upper speaker is properly assembled
• Replace speaker and check if the failure is fixed
• Check if SPO_LP/N, SPO_RP/N has signal output
• Check if SPKVDD is 3.4V~4.35V (VBATA)
• Check if codec has DBVDD_1V8 ,AVDD_1V8 ,
DACREF_1V8, CPVDD_1V8 power
• Check if I2C2_SCL/SDA and I2C0_SCL/SDA works
normally
• Reheat or replace Codec
• Reheat or replace SOC
Trouble Shooting – Hall Sensor Fail
• Check if HALL_PWR have 3.3V
• Use the magnet to Trigger hall sensor, check if
O_LID#_EC is pulled low
• Reheat or replace Hall sensor
• Check if HALL_PWR have 3.3V
• Use the magnet to Trigger hall sensor, check if
O_LID#_EC is pulled low
• Reheat or replace Hall sensor
• Reheat or replace EC (U3301)
Trouble Shooting – Charging Fail
• Plug adapter in and check if CHG_USBIN_S has 5V
supply
• Check if USB1_ID is pulled high
• Check if AC_IN# is pulled low
• Plug adapter in and check if CHG_USBIN_S has 5V
supply
• Check if USB1_ID is pulled high
• Check if AC_IN# is pulled low
• Check if VSYS has voltage output
• Check if VBATT_CONN voltage gradually increases
• Reheat or replace EC (U3301)
• Reheat or replace charger (PU8101)
Trouble Shooting – Gyro/G-Sensor Fail
• Check if VDD_GYRO is 3.3V
• Check if VDDIO_GYRO is 1.8V
• Check if GSENSOR_INT works normally
• Check if I2C_4_SCL_SEN/I2C_4_SDA_SEN works
• Check if VDD_GYRO is 3.3V
• Check if VDDIO_GYRO is 1.8V
• Check if GSENSOR_INT works normally
• Check if I2C_4_SCL_SEN/I2C_4_SDA_SEN works
normally
• Reheat or replace U3001
• Reheat or replace SOC
Trouble Shooting – e-Compass Fail
• Check if VID_COM is 1.8V
• Check if VDD_COM is 3.3V
• Check if COM_SDA/COM_SCL works normally
• Reheat or replace U3002
• Check if VID_COM is 1.8V
• Check if VDD_COM is 3.3V
• Check if COM_SDA/COM_SCL works normally
• Reheat or replace U3002
• Reheat or replace U3001
Trouble Shooting – Touch Fail
• Check if touch FPC is properly assembled
• Replace touch FPC and check if it work normally
• Replace touch panel and check if work normally
• Check if touch controller driver is installed normally
• Check if touch FPC is properly assembled
• Replace touch FPC and check if it work normally
• Replace touch panel and check if work normally
• Check if touch controller driver is installed normally
• Check if AVDD28_GTP_3V3 supply
• Check if VDDIO_QTP has 1.8V supply
• Check if I2C5_SCL/SDA works normally
• Check if TOUCH_RESET_N is pulled high
• Reheat or replace touch controller U2101
Thank You
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