ZD551KL
Introduction &Training
2015/06/17
ZD551KL Outline
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System Block Diagram
Component and PCB Board Introduction
Power On Sequence
Trouble Shooting Guide
ZD551KL
Cam_I2C
28x16
Hall Sensor
Sub-board
Sub-board
ZD551KL Outline
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System Block Diagram
Component and PCB Board Introduction
Power On Sequence
Trouble Shooting Guide
Audio jack
ALS & P-Sensor
PCB Board Introduction (TOP)
G-sensor
Second MIC
R&G charge Indicator
eMCP
Front Flash LED Driver IC
SOC
8939 External-buck
I/O Con.
Charger IC
BATT CON.
Rear CAMERA 13M Conn. PMIC
Backlight driver IC
PCB Board Introduction (BOTTOM)
E-compass
Power key Con.
Front CAMERA 13M Conn.
TP CON.
Rear Flash LED Driver IC
Touch IC
RTC BAT
Laser FPC Con.
SIM 2
LCD CON.
SIM 1 & SD CARD
Volume key spring
Debug con.
ZD551KL Outline
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•
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System Block Diagram
Component and PCB Board Introduction
Power On Sequence
Trouble Shooting Guide
• Laser IC module introduction
POWER ON SEQUENCE
Power on sequence table
Power domain
net name
(1)
VREG_S4
VREG_S4_2P1
(2)
VREG_S3
VREG_S3_1P3
(3)
VREG_L3
VREG_L3_1P15
(4)
VREG_S1
VREG_S1_1P15
(5)
VREG_S2
VREG_S2_1P15
(6)
+EXT-BUCK-S5
VREG_S5_1P15
(7)
MPP1
VDD_PX_BIAS_MPP
(8)
VREG_L5
VREG_L5_1P8
(VDD_IO_1P8)
(9)
VREG_XO
VREG_XO
(10)
VREG_L7
VREG_L7_1P8 (VDD_XO_1P8)
(11)
VREG_L6
VREG_L6_1P8 (LCD_1V8)
(12)
VREG_L2
VREG_L2_1P2
(13)
VREF_LPDDR2/3
VREF_LPDDR3
(14)
VREG_L13
VREG_L13_3P075
(15)
VREG_L8
VREG_L8_2P9 (LCD_2V8)
(16)
VREG_L12
VREG_L12_SDC
(17)
VREG_L11
VREG_L11_SDC
(18)
PON_RESET_N
MSM_RESIN_N
(19)
PS_HOLD
PS_HOLD
ZD551KL Outline
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•
•
•
System Block Diagram
Component and PCB Board Introduction
Power On Sequence
Trouble Shooting Guide
Trouble Shooting Guide
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No boot
No display
Display error
Camera error
G-sensor error
Charging error
SD card error
SIM card error
Trouble Shooting Guide
No boot
1. Check power on key FPC has no assembled properly
2. Check power supply or battery voltage is normal (must be greater than 3.5V)
3. Use the Multimeter measure power rail, Check has no short-circuit (first
basic measure VBAT or VSYS)
4. Check PS_HOLD (T0803) has no pull-high, If the pull-high, representatives
PMIC Power rail has a power; Such as PS_HOLD not pull up, according to the
power on sequence, Check the set of power has failed
5. Measure PMIC Crystal (X8501), Clock signal is correct
6. Re-burn image , If you can not burn, check eMCP (U1501) body and its
peripheral devices, you can reheat U1501, If not ok, replace U1501
7. Connect NB, open Device Manager, confirmed that has no catch device, If
not, re-heating U1, still does not work replace U1
Trouble Shooting Guide
No display
1. Check J2001 is normal
2. Cross-validation, check the panel is normal
3. Confirm V LED voltage is normal, after the boost voltage greater than 10V
4. Confirm PU8900, PD8901 has no extremely inverse, PL8900 has no open
5. Confirm LCD_BL_EN is not high, before and after the PSR 8902 should be High.
6. Confirm PWM has no PWM signal output, before and after the PWM signal should have
PSR 8901
Trouble Shooting Guide
Display error
1. Abnormal color screen or blurred screen
=> Check LCM FPC has no assembled, J2001 has no solder skip.
2. Lose color(ex: Less of basic color blue)
=> Re-Download image (LCD need to connect properly)
Trouble Shooting Guide
Camera error
1. Loosen the screws in the middle bezel, check if it is assembly problem
2. Cross-validation Camera module
3. confirm Camera connector (J2102&J2103), no abnormal appearance or
soldering
4. confirm CAM_DVDD_1V8, CAM_AVDD_2V8, CAM_1V2 has no normal
voltage.
5. Confirm PU9301, PU9302 has no extremely inverse
Trouble Shooting Guide
G-sensor(e-compass)error
1. Due to E-compass (U2201) data is by U2204 (G Sensor / Gyro) did Fusion calculation,
if you have a problem, E-compass is usually a problem with U2204
2. Verify that the supply of power to the U2204, VREG_L8_2P9 & VREG_L6_1P8 is
normal
3. Check U2204 surrounding pad eat tin situation whether to present a "spherical"
, please re-heating the IC. (This IC there had been "refused welding" condition).
Trouble Shooting Guide
Charging error
1. Do not use USB and Adaptor to charge, the system will display the charging symbol,
and charge indicator lights
=> Check VBUS has 5v voltage or not, if there is, please measure CHG_OTG_EN #,
if Low, PR8151 pin2 can measure the voltage of VSY and PR 8105 pin1 is Low, replace
PQ8102.
2. Use USB and Adaptor to charge, but no system displays "charging symbol"
=> check Battery conn. CON9601 pin3—BAT_ID , Pin2: BAT_THERM if connector
solder skip or tin crack or Pin skew cause PMIC PU8401 can not detect and can not be
charged.
3. USB charging test items, insert the USB cable have shown AC charging
=> check USB connector USB_HS_D_M & USB_HS_D_P is short or not, if short, please
check sub board of the L0301 is damaged or Pin has Pin2 / Pin1, PIn3 / pin4 has Short, if
there is, please replace it.
When the USB can not connection , it can also check L0301, Pin2 / Pin3 whether there
turned on, PIN1 / pin4 whether there turned on, if " no“, L0301 is damaged, replace
1.
2.
Trouble Shooting Guide
SD card error
Confirm that SD Connector CON2301 solder skips
When you insert SD card, SD_DET # have no pull low ；
3. Confirm the SD_EXT_LDO voltage of PU9901 is 3V or not, if there is no voltage,
check if PU9901 has solder skips, It can be reheated or replaced
4. If 3V output, check the DATA 0 ~ 3 / CMD / CLK has a signal, if there are not
any set of signal, please check the following chart strings (R2314 ~ R2318,
R0802) is normal ；
Trouble Shooting Guide
SIM card error
1. Confirm SIM1 CON 2301, SIM2 CON 2302 has solder skips or not ；
2.Make adb command => adb shell getprop gsm.sim.state can be judged
SIM card status => ready representation SIM detected OK,
absent indicates no detected
3. For SIM1: check VREG_L14_UIM1 Voltage ；
For SIM2: When inserting a SIM2 card, UIM2 PRESENT is pulled low or not ；
check VREG_L15_UIM2 Voltage; UIM2_RESET is pulled high or not.
Trouble Shooting Guide
Laser Issue
• Laser Soft board FPC is located inside the box (red mark)
Back of the phone
Inside the box
Laser Issue
• Please note that the soft board of laser can not be
bent when assembling
Laser soft board
Laser lens
Please note that the soft board of
laser can not be bent (red mark)
When the lens before the test and
after the test, please stick with
tape protection
Laser Issue
• Check bezel in the carton box is working , and also check the
distance of bezel in near the both of 10cm Laser Lens and
40cm Laser Lens.
• Check Laser Lens are taping or blocked.
• Check Laser Lens is serious scratches or damage
• Use of alcohol cotton wipe Laser Focus Lens
• If not, you can try re-assembled middle bezel
• Finally, the soft board of laser in the can be replaced