Asus ZB551KL Installation guide

ASUS ZB551KL Board Level
Training&Trouble Shouting Guide

Outline and Chip Location

Block Diagram

I2C Arrangement &
Power Architecture

I2C Address
ZB551KL I2C Mapping Table
Function
Name
Group
Hex
Bin
LCM Gate DriverIC
KTD2151
FL_I2C
0x3E
0111110
CCM FLASH LED Driver
LM3644TTYFFR
FL_I2C
0x63
1100011
ACCELEROMETERSensor
BMA250E
SENSORS_I2C
0x18
0011000
e
-Compass Sensor
GMC303
SENSORS_I2C
0x0D
0001101
ALS and Proximity Sensor
ePL2590KAWJP
SENSORS_I2C
0x49
1001001
Touch Panel Driver IC
eKTF2145PW
TS_I2C
0x10
0010000
13MP AF Camera Module
OV13850
-2A
CAM_I2C
0x36
110110
8MP AF Camera Module
OV8858
-G04A-2A
CAM_I2C
0x36
110110
5MP FF Camera Module
S5K5E2YA
CAM_I2C
0x10
10000
Laser Focus IC
VL6180
LASER_I2C
0x29
0101001

Power On Sequence(PM8926)

PMIC(PM8926)Voltage Table

Can’t Power On

Can’t Power On
(BAT_Low and VBAT Connector related)
•Measure battery voltage
- if lower than 3.4V , Recharge the battery，
waiting for Battery voltage > 3.7V，Recheck
for power on.
•If battery voltage > 3.7V，Can’t power on，
check J1002 is poor soldering ?

Can’t power on (Turn-on event )
•VPH_PWR exist and without press power key，
Check PM_KYPD_PWR_N voltage should be 1.8V
–Confirm U1101 appearance and X-ray，Try to
re-heat U1101.
•VPH_PWR exist and PM_KYPD_PWR_N with1.8V
press power key，there should be
PM_KYPD_PWR_N high to low transition
–Confirm R1303 and SW1401 appearance , Try
to re-heat or replace a new device

Can’t Power on(XTAL OSC Related)
•Power-on event exist and VREG_L12_1P8V
without 1.8V output
–Check U1101,R1203,C1202
•power-on event exist and, VREG_L12_1P8V with
1.8V，But Y1201 Pin 4 still no signal
–Check R1203
•Y1201 Pin 4 with 1.8V，check XTAL_19M_IN
with 19.2MHz or not ?
–Check Y1201

Can’t Power On(U1101 PM8926
Related)
•U1101 Power on sequence not complete
–Check U1101 appearance and X-ray，iTry to re-heat or
U1101 replacement
•VREG_S1_1P15V/VREG_S2_1P15V/VREG_S5_1P15V
without 1V voltage output
–Check L1101, C1115, C1140, L1102, C1116, C1151,
L1105, C1122
•VREG_S3_1P35V without 1.35V voltage output
–Check L1103, C1117
•VREG_S4_2P1V without 2.1V voltage output
–Check L1104, C1118

Can’t power on(eMMC Related)
•Check U1601 eMMC device appearance and
X-ray ，Try to re-heat
•Check R1609