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LG-D855
LG LG-D855 Service Manual
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3.
TROUB
LE S
HOO
TING
- 71
-
Cop
yright ©
2014 L
G Electr
onics
. Inc.
All rig
ht re
served.
Only f
or training
and service
purpose
s
L
GE Internal U
se Only
3.6
.1.3
Ch
ecking
DRX
RF
signa
l pa
th (B
1)
<Ma
in
T
op
>
TP2
TP1
U13
01
U15
00
FL1
202
2.2n
L1106
FL1755
2140MHz
5
2
4
1
3
G3
IN
OUT
G1
G2
C1449
33p
L1107
DNI
33p
C1446
L1164
DNI
WTR_B1_B4_DRX_MB1
TP1
TP2
70
72
Table of Contents
Default Chapter
2
Table of Contents
2
1 Introduction
3
Purpose
3
Regulatory Information
3
Specifications
5
Key Features
5
Enhanced User Experience
5
Design
5
Camera/Video
6
Multimedia
6
Bluetooth
7
Voice/Audio
7
Tools & Data
7
Technology
8
Frequencies
8
Accessories
9
2 Performance
10
Product Name
10
Supporting Standard
10
Main Parts & Solution
11
HW Features
12
RSSI Display
14
Charging Time
14
Travel Charger
14
Battery Type
14
Current Consumption
15
Battery Bar
15
SW Features
16
H/W Spec
19
GSM Transceiver Specification
19
WCDMA Transmitter Specification
20
WCDMA Receiver Specification
21
HSDPA Transmitter Specification
22
HSDPA Receiver Specification
23
LTE Transmitter Specification
23
LTE Receiver Specification
24
GPS Receiver Specification
24
WLAN 802.11A Transceiver Specification
25
WLAN 802.11B Transceiver Specification
26
WLAN 802.11G Transceiver Specification
27
WLAN 802.11N Transceiver Specification
28
WLAN 802.11N(HT20) Transceiver Specification
30
WLAN 802.11Ac (VHT20)
32
WLAN 802.11Ac(VHT40)
34
WLAN 802.11Ac(VHT80)
36
Bluetooth Transmitter Specification
38
Bluetooth Receiver Specification
39
Nfc
40
3 Trouble Shooting
41
Checking XO Block
42
Checking Transceiver DC Power Supply Circuit Block
44
Checking DC-DC Block
46
ASM (Antenna Switch Module) Block
48
Checking Femid (GSM, W B1/2/5/8, LTE B1/B3/B8/B20) Block
48
Checking SP4T (LTE B7/B28/B40) Block
50
GSM RF Part
52
GSM850/900/1800/1900 Rx
53
Checking RF Signal Path (SW)
54
Checking RF Signal Path
56
GSM850/900/1800/1900 Tx
59
Checking GSM PAM DC Power Circuit
60
Checking RF Signal Path(SW)
62
WCDMA RF Part
66
WCDMA B1/2/5/8 Rx
67
Checking RF Signal Path(B1/B2/B5/B8)
68
Checking DRX RF Signal Path (B1)
71
Checking DRX RF Signal Path (B5)
73
Checking DRX RF Signal Path (B8)
75
WCDMA B1/2/5/8 Tx
77
Checking WCDMA PAM DC Power & Control Circuit
78
Checking RF Signal Path (SW_B1/2/5/8)
80
Checking RF Signal Path (B1/B2/B5/B8)
81
LTE RF Part
84
Lte B1/B3/B7/B8/B20/B28A/B28B/B40 Prx
85
Checking LTE Switch (B3)
86
Checking RF Signal Path (B3)
86
Checking RF Signal Path (B1/B8)
88
LTE B1_W B1_Prxco-Banding
89
LTE B8_W B8_GSM900_RX CO-Banding
89
Checking RF LTE SP4T Switch (B7)
90
Checking RF Signal Path (B7)
90
Checking RF Signal Path (B20)
92
Checking RF LTE SP4T Switch (B28 A)
94
Checking RF Signal Path (B28 A)
94
Checking RF LTE SP4T Switch (B28 B)
96
Checking RF Signal Path (B28 B)
96
Checking RF SP2T Switch (B28 A/B)
98
Checking RF LTE SP4T Switch (B40)
100
Checking RF Signal Path (B40)
100
Lte B1/B3/B7/B8/B20/B28A/B28B/B40 Drx
102
Checking DRX Antenna Switching Module (B1/3/8/20/28/40)
102
Checking DRX Antenna Switching Module
102
Checking DRX Antenna Switching Module(B1/3/8/20/28/40)
104
Checking DRX Antenna Switching Module(B28 A&B)
107
Lte B1/B3/B7/B8/B20/B28A/B28B/B40 Tx
110
Checking LTE PAM DC Power Circuit (B7/B28/B40)
110
Checking LTE PAM DC Power Circuit (B7)
110
Checking RF Signal Path (B7)
112
Checking LTE PAM DC Power Circuit (B28 A&B)
114
Checking RF Signal Path (B28 A&B)
116
Checking LTE PAM DC Power Circuit (B40)
119
Check of RF Signal Path (B40)
121
Checking RF Signal Path(LTE B1/B3/8/20)
123
Checking RF Signal Path(LTE B1/3/8/20 Output)
123
Checking RF Signal Path(LTE B1/3/8/20 Input)
126
BT & WIFI & FM Part
129
Bt & Wifi
130
Fm
133
GPS Part
135
Checking GPS LNA DC Power Circuit
137
Checking GPS RF Signal Path
139
NFC Part
141
Power
144
+0V9_Vreg_S2B
147
Charger
148
Audio
150
Speaker Trouble Shooting
152
Receiver Trouble Shooting
155
Checking the Receiver Pin and PCB Are Contacted Well
156
Check Main PCB Inductor (FB6923/ FB6924)
156
Main MIC Trouble Shooting
157
Waveform with Oscilloscope
159
Sub MIC1 Trouble Shooting
160
Sub MIC 1
162
Sub MIC2 Trouble Shooting
163
Sub_Mic2
165
Ear-MIC Trouble Shooting
166
Unable Detection of Headset Insert
166
No Sound from Ear-MIC
168
Check Parts about MIC Bias(1.8V) (D11007) Works Well?
169
Lcd
170
Touch
173
Sensor
176
Compass + Motion Sensor
176
Ambient Light Sensor
178
Proximity
180
Gyroscope + Accelemeter Sensor
182
Remote Sensor (IRRC Sensor)
184
Usb/Slimport
186
Camera
188
Main Camera
188
VT Camera
191
4 Download
194
[D855] RF Block Diagram
211
[D855] Connectivity Block-Diagram
212
[D855] PM8941 Output Power Management
213
[D855] PM8841 SMPS / PM8941 Input Power Management
214
[D855] Wireless Charger
215
[D855] Main Display I/F
216
[D855] 13M OIS Camera, 2.1M VT Camera
217
[D855] Sensor
218
[D855] Audio Codec I/F
219
6 Circuit Diagram
220
ANT1- GSM QUAD / WCDMA 1,2,5,8 / LTE 1,(2),3,(4),8,(17),20 Diagram
220
< TRX_B28A_B > Diagram
221
ANT3 DRX - WCDMA 1, 5, 8 / LTE 1,(2),3,(4),8,(17),20,40 Diagram
222
< 1-3-5-1_Rfic_Ca_Nca_Wtr1625 > Rev_0.4 Diagram
223
<2-1-2-2-1_Msm8974Ab_Control_Gpio> Rev_0.1 Diagram
224
<2-1-2-2-3_MSM8974AB_POWER> Rev_0.1 Diagram
225
<2-1-2-2-4_MSM8974AB GND & NC> Rev_0.1 Diagram
226
<3-1-4-3-1_LPDDR3_POP_SK Hynix_16G-Bit> Rev_0.3 Diagram
227
<3-2-2-3-1_Emmc_4_5_Toshiba_32G-Byte> Rev_0.4 Diagram
227
<4-1-2_Pmic_Pm8941>
228
<4-2-1_PMIC_PM8841> Rev_0.3
229
<4-9-1-4-3_Bypass_Booster_Single_Tps61282> Rev_0.3 Diagram
230
AT&T Diagram
232
<6-1-1-5_WCD9320> REV_0.3 Diagram
233
< Earjack Detect IC > 12/4 Diagram
234
<7-1-8-4-2_Quad_Lcd_5.5"> Rev_0.1 Diagram
235
<7-4-1_Vt_Camera_20Pin_Vga_1.26M_1.3M_2.4M> Rev_0.3 Diagram
236
<Flash Driver_Lm3646> 11/25 Diagram
236
Slimport/Usb3.0 Rev_0.3 Diagram
237
<7-6-2-1_Slimport_Anx7812Bh-AA-R> Diagram
237
<4-7-3-1_Wireless_Charger_Max14670Ewl_T> Rev_0.3
237
<9-1-2_Battery_Cnt_4P> REV.0.5 Diagram
238
<4-8-1_Fuel_Gauge_Max17048> Rev_0.3 Diagram
238
SINGLE Charger IC Diagram
238
<4-7-2-4_Charger_Switching_Bq24192> Rev_0.3 Diagram
238
<9-2-3-1_Usb_Redriver_Sn65Lvpe502A> Rev_0.3 Diagram
239
<9-2-2_Multi_Io_Usb3_0> Rev_0.3 Diagram
239
Sensor/Motor/Irrc/Sim/Sd/Led Diagrams
240
FPCB_CNT Diagram
241
Back_Key_Ldaf_Fpcb12/20 Diagram
241
From Previously Upper FPCB to Main PCB (11/13 Now) Diagrams
242
< IDPT9025A > Diagram
243
7 Bga Pin Map
244
U6100_WCD9320_IC, Audio Codec (Top View)
244
U18000_Ic,Charger_Idtp9025A (Top View)
245
U4200_PM8841_PMIC (TOP View)
246
U3200_Emmc (Top_View)
247
U5200_PN547/C2_NFC Controller Diagram
248
U8900_Ic,Microprocessors (Bottom View)
249
U1300_IC,DC-DC Converter Diagram
250
Pin Descriptions
250
U7601_Ic,Signal Bridge
251
U95100_WCN3680B_IC, Wifi (Top View)
252
U2100- MSM8974AC (TOP View)-1/2/3
253
U2100- MSM8974AC (TOP View) - 1
254
U2100- MSM8974AC (TOP View)-2
255
U2100- MSM8974AC (TOP View)-3
256
U1500 – WTR1625L (Top View)
257
U4100-PM8941 (Top View)
258
U6200_Ic,Speaker Amplifier (Top View)
259
U6420_IC, Comparator (Top View)
260
U4750, U4751_IC, over Voltage Protection (Top View)
261
U3100_LPDDR3_SDRAM (Top View)
262
8 PCB Layout
263
9 Calibration
268
10 Hidden Menu
287
Hidden Menu Start
287
Device Test
287
Device Test List
287
USIM, SD Card, Ear Pone Wrong, TA, Battery , OTG Test
288
Key Press Test
288
Camcorder Test
289
Camera (VT) Test
289
Led/Display Check Test
289
Ring Test
290
Vibrator Test
290
Irrc Master Phone
290
Touch Window Test
291
Motion Sensor Test
291
GPS BT WIFI Test
291
HDMI Test
292
NFC Test
292
FM Radio
292
Loopback Test
293
Sensor Test
293
Touch Draw Auto
293
Camera OIS Test
294
HW Device Test
294
ELT Test
294
ELT Manual Test
295
Port Setting
295
RF Cal Info
296
Settings - Version Info -ALC
296
WCDMA Only - DM/FOTA Test
297
LTE Only
297
WLAN Test
298
Syncml Test
298
Charging Test
298
GNSS Test, GPS Test
299
Fake Language
299
Connectivity Test
299
Battery Test
300
Call Test
300
Cmas_Rmt
300
SDIO Monitor Control
301
Prx Drx on off
301
SMS Test
301
BT Test
302
HDMI Test - Change Resolution, Play Video
302
MLT Test
302
NFC Test (Hidden Menu)
303
Thermal Daemon Mitigation off
303
DM APP Enable/Disable
303
WVDRM Keybox
304
LGODL On/Off
304
Autorun Test
304
ATS Start Property On/Off
305
High Temperature Property off
305
Lg Rct
305
Ims
306
Slimport Test
306
Factory Reset
306
Mms – Lg
307
Mirrorlink Test
307
Qcril Log Adb on
307
Qmicmset
308
Moca
308
USB Info
308
11 Disassemble Guide
309
Disassemble Rear Cover, Main Antenna
309
Disassemble Main Antenna
310
Disassemble Main PCB
311
Disassemble H/W Parts
312
12 Exploded View & Replacement Part List
315
Replacement Parts - Mechanic Component
316
Replacement Parts - Main Component
332
Other manuals for LG LG-D855
User Guide
118 pages
Quick Start Guide
74 pages
5
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LG LG-D855 Specifications
General
Brand
LG
Model
LG-D855
Category
Cell Phone
Language
English
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