Company confidential Lenovo S660 Service Manual

Function Block

M/B Top Placement #1
MT6582
MCP

Charge IC
Audio Jack

Receiver
SKY77593
MT6166

FLASH
LED
IC

Backlight IC

26M crystal
MT6627
MB to SB

M/B Bottom Placement #2
MT6323

DUAL SIM CONNECTOR
BACK UP BATTERY
Mic 2

TF CARD CONNECTOR
Battery

BB Common Question

BB-1 Power on failure (無法開機)
BB-2 Firmware update failure (無法更新軟件)
BB-3

BB-1 Can not power on (無法開機) (1/3)

1. Check if battery power

5. Please check whether MT6323 voltage is normal (請確認MT6323周圍電壓是否正常?)
VPROC_PMU should be

BB-1 Can not power on (無法開機) (3/3)

VCORE≈0.7V~1.3V
VPORC≈0.7V~1.3V
VIO18=1.8V
VIO28=2.8V
VM12_INT=1.2V
VA1=2.5V
VA2=2.5V
VUSB=3.3V
VTCXO=2.8V
VMC=3.3V
VMCH=3.3V
RESET=1.8V

MT6323 Power On/Off sequence

BB-2 Can not download (無法更新軟件) (1/3)

1. Please check whether current is

BB-2 Can not download (無法更新軟件) (2/3)

4. If DL is passed, and

BB-2 Can not download (無法更新軟件) (3/3)

5. Check if com port is

BB-3 Can not charging (無法充電) (1/2)

1. Check if battery resistance R332

BB-3 Can not charging (無法充電) (2/2)

4. Check charging IC and related

BB-4 SIM Card Identification error (SIM卡無法識別) (1/2)

1. Check if SIM Card

BB-4 SIM Card Identification error (SIM卡無法識別) (2/2)

SIM1和SIM2的DATA/RST/CLOCK单独分开使用
DATA/RST/CLOCK of SIM1 and SIM2

BB-5 Can not display (畫面無法顯示或顯示異常)

1. Check J904 soldering condition (確認J904是否有異狀[鍚短

G-sensor供电电压。该电压等同于VIO18，该电压异常系统就无法开起来，所以sensor不良不用check此电位。
G-Sensor voltage is as same as VIO18. if this voltage is

BB-6 sensor function fail (感測器不良) (2/2)

G-sensor I2C通過上拉電阻連接到CPU，此I2C與touch panel共用，VDD18_PMU異常會造成所有sensor fail。
G-sensor I2C connect

BB-7 Touch Panel no function (無法觸屏) (1/2)

1. Check if TP connector

BB-7 Touch Panel no function (無法觸屏) (2/2)

TP circuit

TP工作電壓2.8V/1.8V
TP Working Voltage 2.8v/1.8v

BB-8 Vibrator no function (馬達無振動)

1. Check if motor is in normal

BB-9 Camera can not turn on (無法攝像) (1/4)

1. Check camera module

BB-9 Camera can not turn on (無法攝像) (2/4)

主camera的4組工作電壓均是由PMU LDO輸出通過給camera
All 4 working

BB-9 Camera can not turn on (無法攝像) (3/4)

1:無法進入拍攝模式,此為camera無法通過I2C信號被CPU正常識別造成,此不良主要查供電/reset/CLK/PWD是否正常
1. Camera shooting model

BB-9 Camera can not turn on (無法攝像) (4/4)

VREF/HREF: Sensor垂直/水平參考信號
Sensor reference of

BB-10 MIC no function (麥克風無作用)

1. 確認J1003 Microphone是否正常 (正常Mic阻抗約0.95KΩ)
Check if J1003 Microphone

BB-11 Speaker no function (喇叭無聲)

1. 確認MB to SB FPC是否連接ok
Check MB to

BB-12 Audio function fail (Audio 不良) (1/4)

Audio类不良针对不同测试项fail,检查不同的路径.
1:wave play back fail?测的是SPK路径.
2:receiver fail

BB-12 Audio function fail (Audio 不良) (1/4)

Speaker path:

PMU給出SPK信號進入Audio PA 進行放大處理
PMU output

BB-12 Audio function fail (Audio 不良) (2/4)

Receiver path:
Phone MIC path

PMU輸出音頻信號
PMU output

BB-12 Audio function fail (Audio 不良) (3/4)

耳機左右聲道電路: Earphone L/R channel circuit

PMU輸出耳機音頻信號
PMU

BB-12 Audio function fail (Audio 不良) (4/4)

耳機MIC電路 Earphone MIC Circuit:

為耳機MIC提供偏置電壓
Provide bias

BB-13 SD Card no function (SD Card無作用)

SD card 偵測信號
SD card signal

WIFI/BT/GPS

I/Q Signal

SCLK,DataSignal

Connect to CPU MT6582

獨立的26M TCXO，Output Clock to MT6627
Separate 26M TCXO,

MT6627 Power Supply

WIFI/BT/GPS

From PMU MT6323

Output to MT6627

GSM PA + Switch

GSM Vbat

GSM LB Tx input

GSM HB Tx input

WCDMA

GSM RX

GSM HB/LB Circuit:

2G LB Rx

2G HB Rx

Balance output to transceiver

WCDMA Band1/8 TRx (VV36/38)

Tx from Transceiver

Band 8 Tx

Rx balance to transceiver

TRx

WCDMA Band2/5 TRx (VV37)

Tx from Transceiver

Band 5 Tx

Rx balance to transceiver

TRx

RF introduction: MT6166 Function Block

RF introduction: MT6166 Pin assignment

RF introduction: Antenna Circuit

Antenna Circuit
RF天線主要包含了2G/3G/WIFI/GPS,
其匹配電路分別描述如下
RF antenna consists 2G/3G/WIFI/GPS,
Description as

RF introduction:2G/3G Main Antenna Position

RF introduction: WIFI Antenna Position

RF common issue

RF-1:Network function error
RF-2:GSM problem
RF-3:WCDMA problem
RF-4:GSM/WCDMA Rx error
RF-5:WIFI problem

RF-1:Network function error

若2G/3G 網路功能異常,請檢查螢幕天線格數,SIM card是否裝好? Coaxial cable和是否組好?
If 2G/3G network is on

RF-2:GSM Trouble shooting (1/3)

Check GSM transmission path (檢查GSM發射路徑)

Tx I/Q Signal

RF-2:GSM Trouble shooting (2/3)

GSM發射路徑 GSM transmission path
由於2G PA和ASM整合在U1302,檢查發射時對應邏輯控制電壓是否正確
Due to 2G

RF-2:GSM Trouble shooting (3/3)

GSM發射路徑 GSM transmission path
檢查發射路徑的功率
check power of transmission path
使用spectrum

RF-3:WCDMA Trouble shooting (1/5)

WCDMA發射路徑 WCDMA transmission path
確認IQ路徑
Check IQ path
使用示波器量測下圖所標之腳位,檢視其波形
Use oscilloscope

RF-3:WCDMA Trouble shooting (2/5)

WCDMA發射路徑 WCDMA transmission path
確認發射路徑
Check signal transmission path
使用频谱仪量測下圖所標之腳位,檢視其Power
Use oscilloscope

RF-3:WCDMA Trouble shooting (3/5)

WCDMA發射路徑 WCDMA transmission path
Transceiver-3G PA, PA-Duplexer

From MT6166

WCDMA BAND

RF-3:WCDMA Trouble shooting (4/5)

WCDMA發射路徑 WCDMA transmission path
檢查ASM 邏輯控制電壓
Check ASM logical

RF-3:WCDMA Trouble shooting (5/5)

GSM PA+ASM

發射路徑 ASM-RF Con (GSM + WCDMA)
Transmission Path

RF-4:GSM/WCDMA Trouble shooting

接收路徑 Receiving Path
檢查 Antenna switch Module邏輯控制電壓
Check Antenna switch module

WIFI/BT/GPS

WIFI/BT/GPS IC: MTK MT6627
BT/WIFI:

1. Check whether the antenna of BT\WIFI

WIFI/BT/GPS

BT/WIFI TRX path ：

MT6627 U1504

MT6627 U1504

MT6166 U1303

Co_clock design：

WIFI/BT/GPS

GPS RX path ：
1. Check whether the antenna of GPS damaged
2.

WIFI/BT/GPS

GPS RX path

MT6627 U1504

U1506