LG LMX430EMW Owner's Manual [es]

MOBILE PHONE

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL

MODEL : LM-X430EMW

Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual

Date: September 2019 / Issue 1.0

Table Of Contents

1. INTRODUCTION.................................................

1.1Purpose

1.2Regulatory Information

2. PERFORMANCE...................................................

2.1Band Specification

2.2HW Features

2.3RSSI Display

2.4Current consumption

2.5Battery bar

2.6SW Specification

3. TROUBLE SHOOTING..........................................

3.1Checking XO Block

3.2Checking Transceiver DC Power Supply Circuit Block

3.3Checking DC-DC Block

3.4ASM Block

3.5GSM, WCDMA, LTE PART

3.5.1GSM, WCDMA, LTE PART - PRx

3.5.2WCDMA, LTE PART – Tx

3.5.3GSM PART – Tx

3.5.4GSM,WCDMA, LTE PART - DRX

3.6Power

3.7Charger

3.8Audio Block

3.8.1Audio receiver

3.8.2Audio speaker

3.8.3Audio Main Mic

3.8.4Audio sub Mic

3.8.5Audio Ear mic jack

3.9Checking LCD Block

3.10Checking Touch Block

3.11Checking Compass sensor Block

3.12Checking Accel sensor Block

3.13Checking Proximity sensor Block

3.14Checking main camera Block

3.15Checking front camera Block

3.16Checking Motor Block

3.17Checking BT/WIFI Block

3.18Checking GPS Block

3.19Checking NFC Block


4.	BLOCK DIAGRAM…..................................................... 54
5.	BGA PIN MAP............................................................		66
6.	PCB LAYOUT…...........................................................		67
7.	MEMORY VARIATION..............................................		74
8.	HIDDEN MENU..........................................................		75
9.	DOWNLOAD…............................................................		79
10.		CALIBRATION............................................................	80
11.		DISASSEMBLE GUIDE...............................................	81

12.EXPLODED VIEW………………………………………... 86

13.REPLACEMENT PART LIST..…………………………. 87

1. INTRODUCTION

1.1 Purpose

This manual provides the information necessary to repair, calibration, description and download the features of this model.

1.2 Regulatory Information

A. Security

This material is prohibited to share and release to unauthorized person, in accordance with the regulations, LG Electronics, Civil / criminal responsibility in accordance with the relevant provisions violate.

B. Precautions for repair

• In case of Disassembly or Assembly to repair product, be careful of a product failure caused by RF signals and Static electricity.

•When using Magnetic tool for the Phone's SVC repair, you should check affect the Electric parts according to effect of Magnet.

•When fastening the screw, be careful not to damage the head of screw and even product.

C. Attention
Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the	sign.
Following information is ESD handling:

•Service personal should ground themselves by using a wrist, strap when exchange system board.

•When repair are made to a system board, they should spread the floor with anti-static mat which is also grounded.

•Use a suitable, grounded soldering iron.

•Keep sensitive parts in these protective packages until these are used.

•When returning system board or parts like EEPROM to the Factory, use the protective package as described.

2. PERFORMANCE

2.1 Band Specification

Support Band	TX Freq (MHz)		RX Freq (MHz)

WCDMA(FDD1)	1920	– 1980	2110	– 2170

WCDMA(FDD2)	1850	– 1910	1930	– 1990

WCDMA(FDD5)	824	– 849	869	– 894

WCDMA(FDD8)	880	– 915	925	– 960

EGSM	880	– 915	925	– 960

GSM850	824	– 849	869	– 894

DCS1800	1710	– 1785	1805	– 1880

PCS1900	1850	– 1910	1930	– 1990

LTE1	1920	– 1980	2110	– 2170

LTE3	1710	– 1785	1805	– 1880

LTE7	2500	– 2570	2620	– 2690

LTE8	880	– 915	925	– 960

LTE20	832	– 862	791	– 821

LTE38	2570	– 2620	2570	– 2620

2. PERFORMANCE

2.2 HW Features

	List		Type / Spec.

1.	Phone Type	DOP Type

2.	Size	156.3mm x 73.9mm x 8.6mm

3.	Weight	169g ( with Battery )

4.	Battery	3500mAh(Typ), 3400mAh(Min), 3.87V, (Li-ion)

5.Chipset		MT6762 2.0GHz Octa core (Quad x Max 2.0G + Quad x Max 1.5G)

6.	Memory	32GB(eMMC) + 2GB(LPDDR3)
6.	Memory	External Memory(SD Card) : Up to 2TB
		External Memory(SD Card) : Up to 2TB

		Size	6.088" HD+ (1560 x 720)

7.	LCD	Display Type	Active matrix TFT, Transmissive Type

		Color	16.7M colors
		Color	16.7M colors

		Resolution	HD+(1560(V) x 720(H)), 282ppi

8.	Touch	Type	6.088 inch GFF

		Type	CMOS image sensor

		Resolution	4160(H) X 3120(V) pixels.

9.	Main Camera (13M)		4:3(13.0MP – 4160x3120), 4:3(6.5MP – 2944x2208)
9.	Main Camera (13M)	Image Scaling Down	16:9(9.7MP – 4160x2340), 16:9(4.9MP – 2944x1656)
			FullVision(8.0MP – 4160x1920), FullVision(4.0MP – 2944x1360)
			1:1(9.7MP – 3120x3120), 1:1(3.4MP – 1840x1840)

		Format	Image : JPG, Video : MP4

2. PERFORMANCE

2.2 HW Features

9. Main Wide Camera(W5M)		Type	CMOS image sensor

		Resolution	2560(H) X 1920(V) pixels

		Image Scaling Down	4:3(5.0MP – 2560x1920), 4:3(2.5MP – 1824x1368)
			16:9(3.7MP – 2560x1440), 16:9(1.9MP – 1824x1026)
			FullVision(3.0MP – 2560x1182), Fullvision(1.5MP – 1824x842)
			1:1(3.7MP – 1920x1920), 1:1(0.5MP – 720x720)

		Format	Image : JPG, Video : MP4

10.	Audio	Receiver	08 X 09 X 2.7T Receiver
		Receiver	08 X 09 X 2.7T Receiver

		Speaker	15 X 11 X 2.8T Speaker

		Format	MP3, AAC, MIDI, EAAC+, OGG, AMR

11.	Bluetooth	Standard	Bluetooth 5.0

		Effective Distance	10M

		Distance	0 m ~ 10 m (depend on environment)

12.	WLAN	Standard	IEEE 802.11 b/g/n

		Depend on environment	0 ~ 50m (depend on environment)

13.	GPS	type	A-GPS, GLONASS

14.	NFC	Chipset	PN553,NXP

2. PERFORMANCE

2.3 RSSI Display

RSSI BAR

GSM RSSI

WCDMA RSSI

LTE RSSI

Comment

BAR 5->4

- 90dBm± 4dB

- 85dBm± 4dB

-85dBm ± 4dB

BAR 4->3

- 95dBm± 4dB

- 90dBm± 4dB

-95dBm ± 4dB

1. Call Connected & CPIPH Level=-3.3

BAR 3->2

- 98dBm± 4dB

- 96dBm± 4dB

-105dBm ± 4dB

2. LTE:RSRP

BAR 2->1

- 102dBm± 4dB

- 100dBm± 4dB

-115dBm ± 4dB

BAR 1->0

- 104dBm± 4dB

- 106dBm± 4dB

-128dBm ± 4dB

2.4 Current consumption

Stand by

Voice Call

Measurement Condition

Bluetooth Off

Bluetooth Connected

(LTE Data connection)

WCDMA Only

11 mA under(DRX=7)

13 mA under(DRX=7)

350mA under(Tx=10dBm)

LCD off

GSM Only

11 mA under(PP=5)

13 mA under (PP=5)

360mA under(Lvl=5)

LCD off

LTE

11 mA under(LTE 2.56S)

13 mA under(LTE 2.56s)

350mA(@TX 10 dBm)

LCD off

VoLTE

11 mA under(LTE 2.56S)

13 mA under(LTE 2.56s)

400mA(@TX 10 dBm)

LCD off

2. PERFORMANCE

2.5 Battery bar

Battery Bar icon	Specification(%)

Level 20	98 ~ 100
Level 19	93	~ 97
Level 18	88	~ 92
Level 17	83	~ 87
Level 16	78	~ 82
Level 15	73	~ 77
Level 14	68	~ 72
Level 13	63	~ 67
Level 12	58	~ 62
Level 11	53	~ 57
Level 10	48	~ 52
Level 9	43	~ 47
Level 8	38	~ 42
Level 7	33	~ 37
Level 6	28	~ 32
Level 5	23	~ 27
Level 4	16	~ 22
Level 3	13	~ 15
Level 2	8 ~ 12
Level 1	3	~ 7
Level 0	0	~ 2
Low Battery Pop-up	16% 15% : One Time popup (No call) There is no pop-up until 5% if you delete pop-up.
Critical Low battery pop-up	6%  5% : One Time popup (No call) There is no pop-up until 3% if you delete pop-up.
Power off	Under 1%

		2. PERFORMANCE


2.6 SW Specification

Item	Feature	Comment

RSSI	0 ~ 5 Levels
Battery Charging	0 ~ 100 Levels
Key Volume	0 ~ 15 Level
Audio Volume	0 ~ 15 Level
Time / Date Display	Yes
Multi-Language	Yes	depending on build language
Quick Access Mode	Phone / Messaging / Camera / Gallery / Chrome	Phone / Messaging / Camera / Gallery / Chrome
PC Sync	No	PC Bridge
Speed Dial	Yes	Voice mail center -> 1 key
Profile	Yes	not same with feature phone setting
CLIP / CLIR	Yes
Phone Book	Name / Number / Email / Groups / Postal addresses /	There is no limitation on the number of items.
Phone Book	Organizations / IM / Note / Nickname / Website / Event /	It depends on available memory amount.
	Organizations / IM / Note / Nickname / Website / Event /	It depends on available memory amount.

Last Dial Number	Yes
Last Received Number	Yes
Last Missed Number	Yes
Search by Number/Name	Yes
Group	Yes	There is no limitation on the number of items.
Group	Yes	It depends on available memory amount.
		It depends on available memory amount.

Fixed Dial Number	Yes
Service Dial Number	Yes	It depends on operator requirements.
Own Number	Yes	My Profile (add/edit/delete are supported)

		2. PERFORMANCE


2.6 SW Specification

Voice Memo	Yes	Support voice recorder
Call Reminder	No
Network Selection	Automatic

Mute	Yes

Call Divert	Yes
Call Barring	Yes
Call Charge (AoC)	No
Call Duration	Yes

SMS (EMS)	There is no limitation on the number of items.	EMS does not support.
SMS (EMS)	It depends on available memory amount.	EMS does not support.
	It depends on available memory amount.

SMS Over GPRS	No
EMS Melody / Picture Send / Receive / Save	No

		 Send / Receive : Yes
		 Save : depends on content type
MMS MPEG4		Support video content type list
MMS MPEG4	Yes	1. video/mp4
Send / Receive / Save	Yes	1. video/mp4
Send / Receive / Save		2. video/h263
		2. video/h263
		3. video/3gpp2
		4. video/3gpp

Long Message	MAX 2000 characters	The standard of Open vender
Cell Broadcast	Yes	CB app supports Cell Broadcast message

Download	Over the Web

Game	No
Calendar	Yes
Memo	Yes	There is no limitation on the number of items.
Memo	Yes	It depends on available memory amount.
		It depends on available memory amount.

World Clock	Yes

		2. PERFORMANCE


2.6 SW Specification

Unit Convert	No

Stop Watch	Yes
Wall Paper	Yes
WAP Browser	No	Support only web browser via Chrome. WAP stack and wml are not supported.
Download Melody/Wallpaper	Yes	Over web browser
SIM Lock	Yes
SIM Toolkit	Yes
MMS	Yes	Android Message
EONS	Yes
CPHS	Yes	V4.2
ENS	No
Camera	Yes	Front 13M, Rear 13M + W5M
JAVA	No
Voice Dial	No
IrDa	No
Bluetooth	Yes	Ver. 5.0
FM radio	No
GPRS	Yes	Class 12
EDGE	Yes	Class 12
Hold / Retrieve	Yes
Conference Call	Yes	Max. 6
DTMF	Yes
Memo pad	No
TTY	No
AMR	Yes
SyncML	No
IM	No	Hangout was IM, but it's not preloaded anymore.
Email	Yes

3.TROUBLE SHOOTING

3.1 Checking XO Block

The output frequency(26MHz) of VCTXO(X15000) is used as the reference one of MT6176

Checking Flow

START

Image

Check TP1	XO Circuit is OK.	TP1
Check TP1	XO Circuit is OK.	R4031
Is it 26MHz?	Check next step	R4031
	YES
NO

U4000

Replace U4000 and then check TP1

	Is it 26MHz?	XO Circuit is OK.
	Is it 26MHz?	Check next step
		Check next step
		YES
	NO

Circuit Diagram	TP1
	TP1
	R4031

The Problem may be Logic part Refer to Logic trouble shoot

3.TROUBLE SHOOTING

3.2 Transceiver DC Power Supply Circuit Checking Transceiver DC Power Supply Circuit

Checking Flow

START

Check TP1
+1.2V_RF is OK?	NO
	NO
YES
Check TP2
+1.8V_RF is OK?	NO
	NO
YES
Check next step

The Problem may be Logic part Refer to Logic trouble shoot

The Problem may be Logic part. Refer to Logic trouble shoot

Image

TP1(1.2V)

C4038

	TP2(1.8V)	U4000
	C4000	U4000
	C4000

Circuit Diagram

TP2(1.8V)

TP1(1.2V)

3.TROUBLE SHOOTING

3.3 DC-DC Block

Checking DC-DC Block

Checking Flow

START

		NO
Check TP1(VSYS)		Check U4103
0.5V ≤ TP1 ≤ 4.2V	?	Physical Damage or soldering condition

YES

Check next step

Image	TP1(VSYS)
	C4120

U4103

Circuit Diagram

TP1(VSYS)

C4120

3.TROUBLE SHOOTING

3.4 ASM Block
Checking ASM Block	Image
	Image
	Checking Flow
START

Check	The Problem may be Logic part
TP1, TP2 High Level?	The Problem may be Logic part
(3.0V≤TP1 ≤4.6V)	Refer to Logic trouble shoot
(1.65V≤TP2 ≤2.0V)	NO

TP2(1.8V)

C4242

U4211

YES

NOT

GOOD

Check U4211

physical Damage or soldering Replace U4211 condition

OK?

Check Next step

Circuit Diagram

TP1(3.5V)

C4238

TP1(3.5V)

C4238

TP2(1.8V)

C4242

3.5 GSM, WCDMA, LTE PART		3. TROUBLE SHOOTING


	3.5.1 GSM, WCDMA, LTE PART(MB) - PRx
	Checking Rx signal path (GSM 1800/1900 WCDMA B1/B2, LTE B1/B3)
	Checking Flow

START

Image

Check	NO	Check Component
Check		Check Component
TP1/2/3 Signal exist?		above RF signal path and
		ASM or Switch Block
YES
Check	NOT GOOD			U4000	TP1(B1 PRx)
Check
Transceiver physical damage
Transceiver physical damage		Replace U4000		(MT6177)	C4275
or soldering condition		Replace U4000	TP2(B2/G1900 PRx)	(MT6177)	C4275
			TP2(B2/G1900 PRx)
			C4230
OK?
Check next step			TP3(B3/G1800 PRx)
Check next step			L4268
			L4268
Circuit Diagram	TP1(B1 PRx)
Circuit Diagram	C4275

B2/G1900

B3/G1800

TP2(B2/G1900 PRx)

L4268

TP3(B3/G1800 PRx)

C4230

3.5 GSM, WCDMA, LTE PART				3. TROUBLE SHOOTING


	3.5.1 GSM, WCDMA, LTE PART(LB/HB) - PRx			Image
	Checking Rx signal path (GSM850/900, WCDMA B5/B8, LTE B7/B8/B20/B38)			Image

	Checking Flow
	START
	Check	NO	Check Component
	Check		Check Component
	TP1/2/3/4/5 Signal exist?		above RF signal path and
			ASM or Switch Block

YES

	Check	NOT GOOD
	Check
	Transceiver physical damage	Replace U4000
	or soldering condition	Replace U4000
	or soldering condition

U4000

(MT6177) TP3(B7 PRx) C4285

OK?	TP1(B5/G850 PRx)
	TP1(B5/G850 PRx)
	L4231

Check next step

TP4(B20 PRx)

C4243

		Circuit Diagram
B5/G850			TP5(B38 PRx)
B5/G850	TP1 (B5/G850 PRx)	B8/G900	C4176
		B8/G900

L4231	TP2(B8/G900 PRx)
	TP2(B8/G900 PRx)
	C4266

3.5 GSM, WCDMA, LTE PART		3. TROUBLE SHOOTING

3.5.1 GSM, WCDMA, LTE PART(LB/HB) - PRx

Checking Rx signal path (GSM850/900, WCDMA B5/B8, LTE B7/B8/B20/B38)

B20

TP3 (B7 PRx)

C4285

TP5(B38 PRx) C4176

B38

TP4(B20 PRx)

C4243

3.5 GSM, WCDMA, LTE PART		3. TROUBLE SHOOTING


	3.5.2 WCDMA, LTE PART - Tx
	Checking Tx signal path(WCDMA B1/B2/B5/B8, LTE B1/B3/B7/B8/B20/B38)

Checking Flow
START
Check TP1		The Problem may be Other part
VPA_PMU OK?	NO	Check PMIC Logic part
	NO
YES
Check TP1		The Problem may be Other part
3.4V≤TP2≤4.4V?		Check PMIC Logic part
	NO
YES
Check TP5~TP14		Check component
If LTE of All band	YES	above RF signal path
Over 22dBm?	YES	and ASM block
NO
Check TP2~TP4
If WCDMA/LTE of All band	YES	Replace U6701
Over 0dBm?	YES

NOT GOOD

Check

Transceiver physical damage Replace U6701 or soldering condition

OK?

Check next step

	Image TP1(VBAT)
TP2(LB_input Tx) TP3		C4119
TP2(LB_input Tx) TP3
C4146	(MB_input TX)	TP4(HB_input TX)
TP7(B2 Tx)	C4116	C4174
C4128

TP11(B8 Tx)	U4103	TP8(B38 Tx)
TP11(B8 Tx)		C4105
L4121		C4105
L4121	(MMPA)
	(MMPA)
		TP9(B7 Tx)
		C4101
TP10(B20 Tx)
L4101
TP12(B5 Tx)
L4100	TP5(B1 Tx)
TP6(B3 Tx)	TP5(B1 Tx)
TP6(B3 Tx)	C4122
C4126	C4122
C4126

U4000

(MT6177)

3.5 GSM, WCDMA, LTE PART		3. TROUBLE SHOOTING

3.5.2 WCDMA, LTE PART - Tx

MMPA Input

LB_input Tx

MB_input Tx

HB_input Tx

Circuit Diagram

TP2(LB_input Tx)

C4146

TP3(MB_input Tx)

C4116

TP1(VBAT)

C4119

TP4(HB_input TX)

C4174

3.5 WCDMA, LTE PART 3. TROUBLE SHOOTING

3.5.2 WCDMA, LTE PART - Tx

MMPA Output	Circuit Diagram

TP5(B1 Tx)

C4122

B1 Tx

TP6(B3 Tx)	B3 Tx
C4126

TP7(B2 Tx)	B2 Tx
C4128

B38 Tx

TP8(B38 Tx)

C4105

3.5 GSM, WCDMA, LTE PART		3. TROUBLE SHOOTING

3.5.2 WCDMA, LTE PART - Tx
MMPA Output	Circuit Diagram
	Circuit Diagram

TP10(B20 Tx)

L4101

TP11(B8 Tx)

L4121

TP9(B7 Tx)	B7 Tx
C4101

B20 Tx

B8 Tx

TP12(B5 Tx)

L4100

B5 Tx

3.5 GSM, WCDMA, LTE PART		3. TROUBLE SHOOTING


	3.5.3 GSM PART - Tx
	Checking Tx signal path(GSM850/900/1800/1900)	Image
		Image
	Checking Flow
	START

Check TP1/2

VBAT/VIO OK?

YES

Check TP5~TP6 If GSM of All band Over 33/29.5dBm?

The Problem may be Other part Check PMIC Logic part

		Check component
	YES	above RF signal path
	YES	and ASM block
		and ASM block

Check TP3~TP4
If GSM of All band	Replace U4211
Over 0dBm?	YES
NO
	NOT GOOD

Check

Transceiver physical damage Replace U4211 or soldering condition

OK?

Check next step

U4211

ASM+GSM PA

TP4(LB_input Tx)	TP3
C4211	(MB_input Tx)
	C4239

U4000

(MT6177)

TP6(GSM MBTx)

C4223

TP5(GSM LB Tx)

L4236

TP2(1.8V)

C4242

TP1(1.2V)

C4238

3.5 GSM, WCDMA, LTE PART	3. TROUBLE SHOOTING


3.5.3 GSM PART - Tx	Circuit Diagram
	TP1(1.2V)
	C4238

TP2(1.8V)

C4242

TP3(MB_input Tx)

C4239

TP4(LB_input Tx)

C4211

MB_input Tx

GSM Input

LB_input Tx

3.5 WCDMA, LTE PART		3. TROUBLE SHOOTING


	3.5.3 GSM PART - Tx	Circuit Diagram
	GSM Output	Circuit Diagram
	GSM Output
		GSM850/900 Tx
		TP5(GSM LB Tx)
		L4236

GSM1800/1900 Tx

TP6(GSM MBTx)

C4223

3.5 GSM, WCDMA, LTE PART						3. TROUBLE SHOOTING


	3.5.4.1 GSM,WCDMA, LTE PART - DRX
	Checking DRX RF signal path
	(GSM850/900/1800/1900 WCDMA B1/B2/B5/B8 LTE B1/B3/B8/B20)					Image		TP2(VIO)
	Checking Flow						TP1(VDD)	TP2(VIO)
	Checking Flow						TP1(VDD)	C4313
							C4311
	START			TP6(WB1/LTE B1 DRx)				DIP4300
	START			TP6(WB1/LTE B1 DRx)		SW4300
					C4342	SW4300
					C4342		TP3 (G850/
							TP3 (G850/
							WB5 DRx)
	Check TP1, TP2 High Level?		The Problem may be Logic part					C4354
			The Problem may be Logic part
			Refer to Logic trouble shoot
	(2.7V≤TP1 ≤2.8V)		Refer to Logic trouble shoot		TP7(G1800/LTE B3 DRx)
	(2.7V≤TP1 ≤2.8V)
	(1.7V≤TP2 ≤1.9V)	NO
	(1.7V≤TP2 ≤1.9V)	NO			L4306
					L4306
	YES					TP8(G1900/		TP4(G900/WB8
						TP8(G1900/		/LTE B8 DRx)
		NOT				WB2 DRx)		C4370
		GOOD				L4309
						L4309
	Check SW4300/DIP4300		Replace SW4300/DIP4300				TP5 (B20 DRx)
	physical Damage or soldering condition						TP5 (B20 DRx)
	physical Damage or soldering condition							C4320
								C4320
	OK?
	Check	NO	Check Component
			Check Component
			above RF signal path and
	TP3/4/5/6/7/8 Signal exist?		above RF signal path and
	TP3/4/5/6/7/8 Signal exist?		ASM or Switch Block
			ASM or Switch Block
	YES
		NOT GOOD			TP1(VDD)		TP2(VIO)
	Check	NOT GOOD			C4311 Circuit Diagram		C4313
	Check				C4311 Circuit Diagram		C4313
	Transceiver physical damage		Replace U4000
	or soldering condition		Replace U4000
	or soldering condition

OK?

Check Next step

3.5 GSM, WCDMA, LTE PART		3. TROUBLE SHOOTING


	3.5.4.1 GSM,WCDMA, LTE PART - DRX
	Checking DRX RF signal path
	(GSM850/900/1800/1900 WCDMA B1/B2/B5/B8 LTE B1/B3/B8/B20)

B1 DRX	C4342
	TP6(WB1/LTE B1 DRx)

TP3(G850/WB5 DRx)

C4354

TP7(G1800/LTE B3 DRx)

L4306

TP4(G900/WB8/LTE B8 DRx)

C4370

B20 DRX

TP5(B20 DRx)

C4320

TP8(G1900/WB2 DRx)

L4309

3.5 GSM, WCDMA, LTE PART		3. TROUBLE SHOOTING


	3.5.4.2 GSM,WCDMA, LTE PART - DRX
	Checking DRX RF signal path (LTE B7/B38)	Image
		Image
	Checking Flow

START

Check J4500/J4303			Re-connet coaxial cable properly
Check J4500/J4303
Connected properly?
YES
Check TP1, TP2 High Level?			The Problem may be Logic part
Check TP1, TP2 High Level?			Refer to Logic trouble shoot
(2.7V≤TP1 ≤2.8V)			Refer to Logic trouble shoot
(1.7V≤TP2 ≤1.9V)		NO
YES
	NOT
	GOOD
Check W4301
physical Damage or soldering condition			Replace SW4301
			TP2(VIO)
OK?			C4308
Check		NO	Check Component
Check			Check Component
TP3/4 Signal exist?			above RF signal path and
			ASM or Switch Block
YES
Check	NOT GOOD
Check
Transceiver physical damage			Replace U4000
or soldering condition

OK?

Check Next step

J4500 J4303

(Coaxial Cable Connector)

TP4(B7 DRx)	SW4301
TP4(B7 DRx)
R4332	TP3(B38 DRx)
	TP3(B38 DRx)
	R4330
	TP1(VDD)
	C4310

3.5 GSM, WCDMA, LTE PART	3. TROUBLE SHOOTING


3.5.4.2 GSM,WCDMA, LTE PART - DRX
Checking DRX RF signal path (LTE B7/B38)
	Circuit Diagram

TP3(B38 DRx)

R4330

TP1(VDD)

R4310

TP2(VIO)

C4308

TP4(B7 DRx)

R4332

3.6 Power	3. TROUBLE SHOOTING

Checking Power signal (Battery connector, Power Key, PMIC Regulator)

Checking Flow

START

		BATTERY	TP1 (TP3204)
		CONNECTOR(J2100)	TP1 (TP3204)
	NO	CONNECTOR(J2100)
Battery voltage	NO	Change or charging
Battery voltage

higher than 3.6V?		the Battery
higher than 3.6V?
YES
Press PWR Key	NO
Press PWR Key		Check POWER_KEY S/W
TP1(TP3204) high to low?		Check POWER_KEY S/W
TP1(TP3204) high to low?
YES
	NO
Check		L1600, L1601, L1602
MT6357 Core Voltage level?		(Check MT6357)
YES
	NO

Check

MT6357 IO Voltage level?

YES

Check Main Clock level ?

YES

Check

Battery connector(J2100)

YES

END

L1604(TP2)

(Check MT6357)

X1800(TP3)

(Check MT6357)

TP3

(X1800)

TP2(L1604)

NO	Change MT6357
	Change MT6357
	And Return to Start

Core DC/DC

Inductor(L1600,L1601, L1602)

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