LG LG-D120 User manual

Internal Use Only
Service Manual
LG-D120
Date : August, 2014 / Issue 1.0

- 2 - Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Table Of Contents
1. INTRODUCTION..................................................................... 3
1.1 Purpose ........................................................................................................3
1.2 Regulatory Information.........................................................................3
2. PERFORMANCE...................................................................... 5
2.1 Product Name............................................................................................5
2.2 Supporting Standard..............................................................................5
2.3 Main Parts : GSM Solution.....................................................................5
2.4 HW Features ...............................................................................................6
2.5 HW SPEC ......................................................................................................8
3. TROUBLE SHOOTING .......................................................... 20
3.1 WCDMA Rx Part...................................................................................... 20
3.2 WCDMA Tx Part ...................................................................................... 34
3.3 GSM Rx Part ............................................................................................. 46
3.4 GSM Tx Part.............................................................................................. 58
3.5 Power ......................................................................................................... 66
3.6 Charging ................................................................................................... 71
3.7 USB TS ........................................................................................................ 73
3.8 Audio.......................................................................................................... 74
3.9 3AXIS Sensor ........................................................................................... 86
3.10 Touch Sensor ........................................................................................ 89
3.11 Vibrator ................................................................................................... 91
3.12 Camera.................................................................................................... 93
3.13 LCD ........................................................................................................... 95
3.14 BT/Wi..................................................................................................... 98
3.15 GPS..........................................................................................................101
3.16 FM Radio...............................................................................................105
4. DOWNLOAD.......................................................................108
5. BLOCK DIAGRAM..............................................................125
6. CIRCUIT DIAGRAM ............................................................132
7. BGA PIN MAP .....................................................................146
8. PCB LAYOUT.......................................................................152
9. CALIBRATION.....................................................................154
10. HIDDEN MENU.................................................................173
11. DISASSEMBLE GUIDE......................................................204
12. EXPLODED VIEW & REPLACEMENT PART LIST .............208

- 3 - Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
1. INTRODUCTION
1. Introduction
1. Introduction
This manual provides the information necessary to repair, calibration, description and download the features
of this model.
1.1 Purpose
1.2 Regulatory Information
A. Security
Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example,
persons other than your company’s employees, agents, subcontractors, or person working on your
company’s behalf) can result in substantial additional charges for your telecommunications services.
System users are responsible for the security of own system. There are may be risks of toll fraud associated
with your telecommunications system. System users are responsible for programming and configuring
the equipment to prevent unauthorized use. The manufacturer does not warrant that this product is
immune from the above case but will prevent unauthorized use of common carrier
telecommunication service of facilities accessed throu
g
h or
A.
Security
g
connected to it. The manufacturer will not be responsible for any charges that result from such
unauthorized use.
B. Incidence of Harm
If a telephone company determines that the equipment provided to customer is faulty and possibly
causing harm or interruption in service to the telephone network, it should disconnect telephone
service until repair can be done. A telephone company may temporarily disconnect service as long as repair
is not done
is
not
done
.
C. Changes in Service
A local telephone company may make changes in its communications facilities or procedure. If these
changes could reasonably be expected to affect the use of the phones or compatibility with the net work,
the telephone company is required to give advanced written notice to the user, allowing the user to take
appropriate steps to maintain telephone service.
D. Maintenance Limitation
D.
Maintenance
Limitation
Maintenance limitations on the phones must be performed only by the manufacturer or its authorized agent.
The user may not make any changes and/or repairs expect as specifically noted in this manual. Therefore,
note that unauthorized alternations or repair may affect the regulatory status of the system and may void any
remaining warranty.
E. Notice of Radiated Emission
This model complies with rules regarding radiation and radio frequency emission as defined by local
- 4 -
regulatory agencies. In accordance with these agencies, you may be required to provide information such as
the following to the end user.

- 4 - Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. INTRODUCTION
1. Introduction
F. Pictures
The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly
different.
H. Electrostatic Sensitive Devices
A phone may interfere with sensitive laboratory equipment, medical equipment, etc. Interference from
unsuppressed engines or electric motors may cause problems.
G. Interference and Attenuation
ATTENTION
Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the sign. Following
information is ESD handling:
• Service personnel should ground themselves by using a wrist strap when exchange system boards.
• When repairs 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 returnin
g
s
y
stem boards or
p
arts like EEPROM to the factor
y
, use the
p
rotective
p
acka
g
e as
g y p y p p g
described.
- 5 -

2. PERFORMANCE
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2. PERFORMANCE
2.1 Product Name
LG-D120 : WCDMA 900/2100+GSM850/EGSM/DCS/PCS(HSUPA 5.8Mbps(cat6)/HSDPA 14.4Mbps(cat8)/GPRS Class12/EDGE Rx only
Class12)
2.2 Supporting Standard
LG-D120 Product SPEC
4
2.1 Product Name
LG-D120 : WCDMA 900/2100+GSM850/EGSM/DCS/PCS
(HSUPA 5.8Mbps(cat6)/HSDPA 14.4Mbps(cat8)/GPRS Class12/EDGE Rx only Class12)
2.2 Supporting Standard
Supporting Standard
WCDMA(FDD1,8)/EGSM/GSM850/DCS1800/PCS1900
with seamless handover
Phase 2+(include AMR)
SIM Toolkit : Class 1, 2, 3, C-E
Frequency Range
WCDMA(FDD1) TX : 1920 – 1980 MHz
WCDMA(FDD1) RX : 2110 – 2170 MHz
WCDMA(FDD8) TX : 880 – 915 MHz
WCDMA(FDD8) RX : 925 – 960 MHz
EGSM TX : 880 – 915 MHz
EGSM RX : 925 – 960 MHz
GSM850 TX : 824 – 849 MHz
GSM850 RX : 869 – 894 MHz
DCS1800 TX :1710 – 1785 MHz
DCS1800 RX : 1805 – 1880 MHz
PCS1900 TX : 1850 – 1910 MHz
PCS1900 RX : 1930 – 1990 MHz
Application Standard
2.3 Main Parts :
Item Part Name Comment
AP Chip M
T
6572M (MTK)
CP Chip MT6572M (MTK)
LG-D120 Product SPEC
4
2.1 Product Name
LG-D120 : WCDMA 900/2100+GSM850/EGSM/DCS/PCS
(HSUPA 5.8Mbps(cat6)/HSDPA 14.4Mbps(cat8)/GPRS Class12/EDGE Rx only Class12)
2.2 Supporting Standard
Supporting Standard
WCDMA(FDD1,8)/EGSM/GSM850/DCS1800/PCS1900
with seamless handover
Phase 2+(include AMR)
SIM Toolkit : Class 1, 2, 3, C-E
Frequency Range
WCDMA(FDD1) TX : 1920 – 1980 MHz
WCDMA(FDD1) RX : 2110 – 2170 MHz
WCDMA(FDD8) TX : 880 – 915 MHz
WCDMA(FDD8) RX : 925 – 960 MHz
EGSM TX : 880 – 915 MHz
EGSM RX : 925 – 960 MHz
GSM850 TX : 824 – 849 MHz
GSM850 RX : 869 – 894 MHz
DCS1800 TX :1710 – 1785 MHz
DCS1800 RX : 1805 – 1880 MHz
PCS1900 TX : 1850 – 1910 MHz
PCS1900 RX : 1930 – 1990 MHz
Application Standard
2.3 Main Parts :
Item Part Name Comment
AP Chip MT6572M (MTK)
CP Chip MT6572M (MTK)
2.3 Main Parts : GSM Solution

2. PERFORMANCE
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2.4 HW Features
LG-D120 Product SPEC
5
2.4 HW Features
List Type / Spec.
1. Phone Type DOP Type
2. Size 105.6 x 64.5 x 13mm
3. Weight 115.3g
4. Battery 1,540mAh ( typ.), 1,500mAh(min) (Li-Ion)
5.Chipset MT6572M
6. Memory 4GB(EMMC) +4Gb(LPDDR2) External Memory(SD Card) : Up to 32GB
7. LCD
Size 3.2 inch
Dot 240(H) X 320(V)
Color 262,144 colors
Display Type Active matrix TFT, Transmissive Type
NTSC Typ. 60%
Contrast Ratio Typ. 300:1
Pixel Pitch 0. 0675mm (125ppi)
Color temperature 6000 ~ 9000(K) ( typ. 6500K)
8. Main Camera (2M)
Type CMOS image sensor
Resolution 2842(H) X 2156(V) pixels.
Frame Rate 15 fps @ Full-FOV
View Angle 42.3˚(V) / 54.7 ˚(H) / 65.7 ˚(D)
Image Scaling Down 2M(1600*1200), 1M(1280*960)

2. PERFORMANCE
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LG-D120 Product SPEC
6
Pixel x size 1.75um X 1.75um (square pixel)
Format MPEG-4, H263, H.264, Xvid, VP8, VP9
10. Audio
1) MIDI MIDI
2) Mono 18 X 10 X 3T Speaker/Receiver Dual
3) Receiver 18 X 10 X 3T Speaker/Receiver Dual
4) Format WAV, AMR, MP3, AAC, AAC+, eAAC+, OGG
11. Bluetooth
Effective Distance 10M
Distance 0 m ~ 10 m (depend on environment)
12. WLAN
standard IEEE 802.11 b/g/n
Throughput Max 40Mbps (SDIO Driver performance)
depend on environment 0 ~ 50m (depend on environment)
13. GPS type A-GPS

2. PERFORMANCE
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LG-D120 Product SPEC
7
2.5. HW SPEC.
1) WCDMA transmitter specification
Item Spec. Min Typ. Max Unit
Maximum Output
Power Power class Ⅲ21.0 23.0 25.0 dBm/3.84MHz
Frequency
Accuracy - -200 - +200 Hz
Minimum Output
Power - - - -50 dBm/3.84MHz
Occupied
Bandwidth - - - 4.6 MHz
Adjacent Channel
Leakage Power
Ratio
Δf = 5MHz - - -33 dBm/3.84MHz
Δf = 10MHz - - -43 dBm/3.84MHz
Error Vector
Magnitude(EVM) - - - 17 %
Peak Code
Domain Error - - - 15 dBm/3.84MHz
Open Loop
Output Power
Ior =-106.7dBm/3.84MHz -46.7 - -28.7 dBm/3.84MHz
Ior =-65.7dBm/3.84MHz -23.0 - -5.0 dBm/3.84MHz
Ior =-25.0dBm/3.84MHz -0.0 - 14.0 dBm/3.84MHz
Transmit Off
Power - - - -56 dBm/3.84MHz
Spectrum
Emission Mask
Δf = 2.5~3.5MHz -35-15 * (Δf-2.5) dBc/30KHz
Δf = 3.5~7.5MHz -35-1 * (Δf-3.5) dBc/1MHz
Δf = 7.5~8.5MHz -39 10 * (Δf-7.5) dBc/1MHz
Δf = 8.5~12.5MHz -49 dBc/1MHz
Transmit Spurious
Emission
9kHz ~ 150kHz -36 dBm
150kHz ~ 30MHz -36 dBm
30MHz ~ 1GHz -36 dBm
1GHz ~ 12.5GHz -30 dBm
2.5 HW SPEC
1) WCDMA transmitter specication

2. PERFORMANCE
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LG-D120 Product SPEC
8
2) WCDMA receiver specification
Item Specification
Receive Frequency
FDD1: 2110 ~ 2170 MHz
FDD8: 925 MHz ~ 960 MHz
Reference Sensitivity Level
<REFÎor>
FDD1 : BER < 0.001 when Îor = -106.7 dBm / 3.84 MHz
FDD8 : BER < 0.001 when Îor = -103.7 dBm / 3.84 MHz
Maximum Input Level BER < 0.001 when Îor = -25 dBm / 3.84 MHz
Adjacent Channel Selectivity
(ACS)
ACS > 33 dB where BER < 0.001 when
Îor = <REFÎor> + 14 dB / 3.84 MHz
& Ioac = –52 dBm / 3.84 MHz @ ±5 MHz
Blocking Characteristic
BER < 0.001 when Îor = <REFÎor> + 3 dB / 3.84 MHz
& Iblocking = -56 dBm / 3.84 MHz @ Fuw(offset) = ±10 MHz
or Iblocking = -44 dBm / 3.84 MHz @ Fuw(offset) = ±15 MHz
Spurious Response
BER < 0.001 when Îor = <REFÎor> + 3 dB / 3.84 MHz
& Iblocking = -44 dBm
Intermodulation
BER < 0.001 when Îor= <REFÎor> + 3 dB / 3.84 MHz
& Iouw1 = -46 dBm @ Fuw1(offset) = ±10 MHz
& Iouw2 = -46 dBm / 3.84 MHz @ Fuw2(offset) = ±20 MHz
Spurious Emissions
< -57 dBm / 100 kHz BW @ 9 kHz ≤ f < 1 GHz
< -47 dBm / 1 MHz BW @ 1 GHz ≤ f ≤ 12.75 GHz
Inner Loop Power Control
In Uplink
Adjust output(TPC command)
cmd 1dB 2dB 3dB
+1 +0.5/1.5 +1/3 +1.5/4
0 -0.5/+0.5 -0.5/+0.5 -0.5/+0.5
-1 -0.5/-1.5 -1/-3 -1.5/-4
group(10equal command group)
+1 +8/+12 +16/+24
2) WCDMA receiver specication

2. PERFORMANCE
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LG-D120 Product SPEC
9
3) HSDPA transmitter specification
Item Spec. Min Typ. Max Unit
Trandsmitter
5.2.A Maximum
Output Power
with HS-DPCCH
1/15 c/d 12/15
13/15 c/d 15/8
15/7 c/d 15/0
21.0
20
19
23.0
23.0
22.5
25.0
25
25
dBm/3.84MHz
5.7A HS-DPCCH
MAX
/
0dBm
Step 0 0 dBm +/- 1 dB dB
Step 1 –
Step 0 6 dB +/- 2.3 dB dB
Step 2 –
Step 3 1 dB +/- 0.6 dB dB
Step 5 –
Step 4 0 dB +/- 0.6 dB dB
Step 6 –
Step 7 5 dB +/- 2.3 dB dB
5.9A Spectrum
Emission Mask
with HS-DPCCH
Δf = 2.5~3.5MHz -35-15 * (Δf-2.5) dBc/30KHz
Δf = 3.5~7.5MHz -35-1 * (Δf-3.5) dBc/1MHz
Δf = 7.5~8.5MHz -39 10 * (Δf-7.5) dBc/1MHz
Δf = 8.5~12.5MHz -49 dBc/1MHz
5.10A Adjacent
Channel Leakage
Power Ratio with
HS-DPCCH
Δf = 5MHz - - -33 dBm/3.84MHz
Δf = 10MHz - - -43 dBm/3.84MHz
5.13.1A Error
Vector
Magnitude (EVM)
with HS-DPCCH
MAX Power
-20 dBm - - 17.5 %
Receiver
6.3A Maximum
Input Level for
HS-PDSCH
Reception
Pin = -25dBm - - 10 BLER(%)
3) HSDPA transmitter specication

2. PERFORMANCE
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LG-D120 Product SPEC
10
4) GSM receiver specification
Item Spec.
Phase Error Rms : 5°
Peak : 20 °
Frequency Error GSM : 0.1 ppm
DCS/PCS : 0.1 ppm
EMC(Radiated Spurious Emission
Disturbance) GSM/DCS : < -28dBm
Transmitter Output power and Burst Timing GSM : 5dBm – 33dBm ± 3dB
DCS/PCS : 0dBm – 30dBm ± 3dB
Burst Timing <3.69us
Spectrum due to modulation out to less
than 1800kHz offset 200kHz : -36dBm
600kHz : -51dBm/-56dBm
Spectrum due to modulation out to larger
than 1800kHz offset to the edge of the
transmit band
GSM :
1800-3000kHz :< -63dBc(-46dBm)
3000kHz-6000kHz : <-65dBc(-46dBm)
6000kHz < : < -71dBc(-46dBm)
DCS :
1800-3000kHz :< -65dBc(-51dBm)
6000kHz < : < -73dBc(-51dBm)
Spectrum due to switching transient 400kHz : -19dBm/-22dBm(5/0), -23dBm
600kHz : -21dBm/-24dBm(5/0), -26dBm
Reference Sensitivity – TCH/FS Class II(RBER) : -105dBm(2.439%)
Usable receiver input level range 0.012(-15 - -40dBm)
Intermodulation rejection – Speech
channels ± 800kHz, ± 1600kHz
: -98dBm/-96dBm (2.439%)
AM Suppression
-GSM : -31dBm - DCS : -29dBm -98dBm/-96dBm (2.439%)
Timing Advance ± 0.5T
4) GSM receiver specication

2. PERFORMANCE
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LG-D120 Product SPEC
11
5) Bluetooth transmitter specification
Item Spec. Min Typ. Max Unit
Output Power DH5
PRBS9 Power
(Class I) 0-20 dBm
Power Density DH5
PRBS9 @100kHz RBW -+20 dBm
Power Control DH1
PRBS9
Step size 2 - 8 dB
Power(min) - 4 dBm
Frequency Range DH5
PRBS9 -30dBc
@100kHz RBW 2400 -2483.5 MHz
Tx Output Spectrum
(20dB BW) DH5 PRBS9 Δf =fH-fL- 1 MHz
Tx Output Spectrum
(Adjacent Output Power) DH5 PRBS9
@M-N = 2 - -20 dBm
@M-N 3 - -40 dBm
Modulation Index
DH5
11110000 f1AVG 140 -175 kHz
DH5
10101010
f2MAX 115 - kHz
f2AVG/f1AVG 0.8 -
Initial Carrier Freq.
Tolerance DH5 PRBS9 -75 -+75 kHz
Carrier Frequency Drift
DH1
10101010
Freq. Drift -25 - +25 kHz
Drift Rate -20 -+20 kHz/50us
DH3
10101010
Freq. Drift -40 - +40 kHz
Drift Rate -20 -+20 kHz/50us
DH5
10101010
Freq. Drift -40 - +40 kHz
Drift Rate -20 -+20 kHz/50us
5) Bluetooth transmitter specication

2. PERFORMANCE
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LG-D120 Product SPEC
12
6) Bluetooth receiver specification
Item Spec.
BER=0.1% Min Typ. Max Unit
Sensitivity
(Single Slot Packet)
DH1
PRBS9
Input power @BT_w ---70 dBm
Sensitivity
(Multi Slot Packet)
DH5
PRBS9
Input power @BT_w
---70 dBm
C/I Performance* DH1 PRBS9
Input power @BT_i
C/I@Co-Channel
-60dBm @ BT -11
dB
C/I @1MHz
-60dBm@ BT -0
C/I @2MHz
-60dBm@ BT --30
C/I @≥3MHz
-67dBm@ BT -40 -37
C/I @Image
-67dBm@ BT --9
C/I @ Image1MHz
-67dBm@ BT --20
Blocking Performance DH1 PRBS9
Input power @CW
30M ~2 GHz
-67dBm@ BT -10 -
dBm
2 ~ 2.4 GHz
-67dBm@ BT -27 -
2.5 ~ 3 GHz
-67dBm@ BT -27 -
3 ~ 12.75 GHz
-67dBm@ BT -10 -
Intermodulation
Performance
DH1
PRBS9
Input power @CW_i
Δf = +5MHz (CW_i)
Δf = +10MHz (BT_i)
-64dBm@ BT_w
-39 -dBm
Δf = -5MHz (CW_i)
Δf = -10MHz (BT_i)
-64dBm@ BT_w
-39 -dBm
Maximum Input Level DH1 PRBS9
Input power @BT_w --20 -dBm
6) Bluetooth receiver specication

2. PERFORMANCE
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LG-D120 Product SPEC
13
7) WLAN 802.11b transceiver specification
Item Specification
Transmit Frequency 2400 MHz ~ 2483.5 MHz ( CH1~CH13)
Tx Power Level ≤ 20dBm under (Europe), ≤ 30dBm under (USA)
Frequency Tolerance within ±25 PPM
Chip clock Frequency
Tolerance
within ±25 PPM
Spectrum Mask ≤ -30 @ fc-22MHz< f <fc-11MHz and fc+11MHz< f <fc+22MHz
≤ -50 @ f < fc-22MHz and f > fc+22MHz
Power ramp on/off time ≤ 2us
Carrier Suppression ≤ -15dB
Modulation Accuracy
(Peak EVM)
≤ 35%
Spurious Emissions < -36 dBm @ 30MHz ~ 1GHz
< -30 dBm above @ 1GHz ~ 12.75GHz
< -47 dBm @ 1.8GHz ~ 1.9GHz
< -47 dBm @ 5.15GHz ~ 5.3GHz
Rx Min input Sensitivity ≤ -76dBm(1Mbps,2Mbps,5.5Mbps,11Mbps) @ FER ≤ 8%
Rx Max input Sensitivity ≥ -10dBm(1Mbps,2Mbps,5.5Mbps,11Mbps) @ FER ≤ 8%
Rx Adjacent Channel
Rejection
≥ 35dB @FER ≤ 8%,
interference input signal -70dBm@fc±25MHz(11Mbps)
7) WLAN 802.11b transceiver specication

2. PERFORMANCE
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LG-D120 Product SPEC
14
8) WLAN 802.11g transceiver specification
Item Specification
Transmit Frequency 2400 MHz ~ 2483.5 MHz ( CH1~CH13)
Tx Power Level ≤ 20dBm under (Europe), ≤ 30dBm under (USA)
Frequency Tolerance within ±25 PPM
Chip clock Frequency
Tolerance
within ±25 PPM
Spectrum Mask
≤ -20 @ ±11MHz offset (9Mhz ~ 11MHz)
≤ -28 @ ±20MHz offset (11MHz ~ 20Mhz)
≤ -40 @ ±30MHz offset (20MHz ~ 30Mhz)
Transmitter constellation error
(rms EVM) ≤ -5dB
Spurious Emissions
< -36 dBm @ 30MHz ~ 1GHz
< -30 dBm above @ 1GHz ~ 12.75GHz
< -47 dBm @ 1.8GHz ~ 1.9GHz
< -47 dBm @ 5.15GHz ~ 5.3GHz
Rx Min input Sensitivity
PER ≤ 10%
-82dBm@6Mbps, -81dBm@9Mbps, -79dBm@12Mbps
-77dBm@18Mbps, -74dBm@24Mbps, -70dBm@36Mbps
-66dBm@48Mbps, -65dBm@54Mbps
Rx Max input Sensitivity ≥ -20dBm(6,9,12,18,24,36,48,54Mbps) @ PER ≤ 10%
Rx Adjacent Channel
Rejection
PER ≤ 10%,
ACR ≥ 16dB@6Mbps, ACR ≥ 15dB@9Mbps,
ACR ≥ 13dB@12Mbps, ACR ≥ 11dB@18Mbps,
ACR ≥ 8dB@24Mbps, ACR ≥ 4dB@36Mbps
ACR ≥ 0dB@48Mbps, ACR ≥ -1dB@54Mbps
※ACR shall be measured by setting the desired signal's strength
3 dB above the rate-dependent
sensitivity specified in min input sensitivity
8) WLAN 802.11g transceiver specication

2. PERFORMANCE
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LG-D120 Product SPEC
15
9) WLAN 802.11n transceiver specification
Item Specification
Transmit Frequency 2400 MHz ~ 2483.5 MHz ( CH1~CH13)
Tx Power Level ≤ 20dBm under (Europe), ≤ 30dBm under (USA)
Frequency Tolerance within ±25 PPM
Chip clock Frequency
Tolerance
within ±25 PPM
Spectrum Mask ≤ -20 @ ±11MHz offset (9Mhz ~ 11MHz)
≤ -28 @ ±20MHz offset (11MHz ~ 20Mhz)
≤ -45 @ ±30MHz offset (20MHz ~ 30Mhz)
Transmitter constellation error
(rms EVM)
≤ [email protected], ≤ -10dB@13Mbps, ≤ -13d[email protected],
≤ -16dB@26Mbps, ≤ -19dB@39Mbps, ≤ -22dB@52Mbps,
≤ [email protected], ≤ -28dB@65Mbps
Spurious Emissions < -36 dBm @ 30MHz ~ 1GHz
< -30 dBm above @ 1GHz ~ 12.75GHz
< -47 dBm @ 1.8GHz ~ 1.9GHz
< -47 dBm @ 5.15GHz ~ 5.3GHz
Rx Min input Sensitivity PER ≤ 10%
[email protected], -79dBm@13Mbps, [email protected]
-74dBm@26Mbps, -70dBm@39Mbps, -66dBm@52Mbps
[email protected]bps, -64dBm@65Mbps
Rx Max input Sensitivity ≥ -20dBm(6.5,13,19.5,26,39,52,58.5,65Mbps) @ PER ≤ 10%
Rx Adjacent Channel
Rejection
PER ≤ 10%,
ACR ≥ [email protected], ACR ≥ 13dB@13Mbps,
ACR ≥ [email protected], ACR ≥ 8dB@26Mbps,
ACR ≥ 4dB@39Mbps, ACR ≥ 0dB@52Mbps
ACR ≥ [email protected], ACR ≥ -2dB@65Mbps
※ACR shall be measured by setting the desired signal's strength
3 dB above the rate-dependent
sensitivity specified in min input sensitivity
9) WLAN 802.11n transceiver specication

2. PERFORMANCE
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LG-D120 Product SPEC
16
10) GPS receiver specification
Item Spec.
Sensitivity Test Success rate ≥60% @ -154 dBm
11) Current consumption
** Test condition for Standby current consumption should be as below.
: Measurement time 1hr, with Agilent & CMT JIG
Item Specification
WCDMA GSM
1. Sleep Mode Under 7mA Under 7mA
2. Sleep : connector Ear jack Under 7mA Under 7mA
3. Current(Sleep & Idle AVG) Under 10mA @ DRX 7 Under 10mA @ P.P 5
4. BT Connected idle Under 15mA Under 15mA
5. Talk Mode
-Max Pwr
Under 600mA @ Avg
- Tx 10dBm
Under 300 mA @ Avg
GSM LVL 5
under 300 mA @ Avg
6. Power Off Mode under 500uA Under 500 uA
7. Backup Battery under 5uA under 5uA
LG-D120 Product SPEC
16
10) GPS receiver specification
Item Spec.
Sensitivity Test Success rate ≥60% @ -154 dBm
11) Current consumption
** Test condition for Standby current consumption should be as below.
: Measurement time 1hr, with Agilent & CMT JIG
Item Specification
WCDMA GSM
1. Sleep Mode Under 7mA Under 7mA
2. Sleep : connector Ear jack Under 7mA Under 7mA
3. Current(Sleep & Idle AVG) Under 10mA @ DRX 7 Under 10mA @ P.P 5
4. BT Connected idle Under 15mA Under 15mA
5. Talk Mode
-Max Pwr
Under 600mA @ Avg
- Tx 10dBm
Under 300 mA @ Avg
GSM LVL 5
under 300 mA @ Avg
6. Power Off Mode under 500uA Under 500 uA
7. Backup Battery under 5uA under 5uA
10) GPS receiver specication
11) Current consumption
** Test condition for Standby current consumption should be as below.
: Measurement time 1hr, with Agilent & CMT JIG

2. PERFORMANCE
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Only for training and service purposes
LGE Internal Use Only
LG-D120 Product SPEC
17
12) Usage duration
Time Duration(hour)
Standby WCDMA (DRX7) 690
GSM (PP5) 560
Call WCDMA (10dBm) 11
GSM (PCL 5) 9
13) Charging hour
Under 3 hour (1,540mAh battery, 700mATA)
Full Charging Voltage : 4.2V ±0.1V
Recharging Voltage : 4.15V ±0.05V
Charging Current : 680mA ±60mA
Cut Off Voltage : 3.3V ±0.1V
14) RSSI indicator (Based on Cell power)
BAR WCDMA
GSM/DCS/PCS
RSSI RSCP
5Over -85 ±2dBm Over -88 ±2dBm Over -91 ±2dBm
54-86 ±2dBm -89 ±2dBm -92 ±2dBm
43-90 ±2dBm -93 ±2dBm -96 ±2dBm
32-96 ±2dBm -99 ±2dBm -100 ±2dBm
21-100 ±2dBm -103 ±2dBm -104 ±2dBm
10-107 ±3dBm -109 ±3dBm -106 ±3dBm
LG-D120 Product SPEC
17
12) Usage duration
Time Duration(hour)
Standby WCDMA (DRX7) 690
GSM (PP5) 560
Call WCDMA (10dBm) 11
GSM (PCL 5) 9
13) Charging hour
Under 3 hour (1,540mAh battery, 700mATA)
Full Charging Voltage : 4.2V ±0.1V
Recharging Voltage : 4.15V ±0.05V
Charging Current : 680mA ±60mA
Cut Off Voltage : 3.3V ±0.1V
14) RSSI indicator (Based on Cell power)
BAR WCDMA
GSM/DCS/PCS
RSSI RSCP
5Over -85 ±2dBm Over -88 ±2dBm Over -91 ±2dBm
54-86 ±2dBm -89 ±2dBm -92 ±2dBm
43-90 ±2dBm -93 ±2dBm -96 ±2dBm
32-96 ±2dBm -99 ±2dBm -100 ±2dBm
21-100 ±2dBm -103 ±2dBm -104 ±2dBm
10-107 ±3dBm -109 ±3dBm -106 ±3dBm
12) Usage duration
14) RSSI indicator (Based on Cell power)
13) Charging hour
Under 3 hour (1,540mAh battery, 700mA TA)
•Full Charging Voltage : 4.2V ± 0.1V
•Recharging Voltage : 4.15V ± 0.05V
•Charging Current : 680mA ± 60mA
•Cut O Voltage : 3.3V ±0.1V

2. PERFORMANCE
- 19 - Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
LG-D120 Product SPEC
18
15) Battery indicator
Battery Bar Specification
BAR 20 (Full) 98% over
remain%
BAR 20 --> 19 98% 97%
BAR 19 --> 18 93% 92%
BAR 18 --> 17 88% 87%
BAR 17 --> 16 83% 82%
BAR 16 --> 15 78% 77%
BAR 15 --> 14 73% 72%
BAR 14 --> 13 68% 67%
BAR 13 --> 12 63% 62%
BAR 12 --> 11 58% 57%
BAR 11 --> 10 53% 52%
BAR 10 --> 9 48% 47%
BAR 9 --> 8 43% 42%
BAR 8 --> 7 38% 37%
BAR 7 --> 6 33% 32%
BAR 6 --> 5 28% 27%
BAR 5 --> 4 23% 22%
BAR 4 --> 3 16% 15%
BAR 3 --> 2 13%

12%
BAR 2 --> 1 8% 7%
BAR 1 --> 0 3% 2%
Low Battery Pop-up 4% ~ 15% : One Time popup (No call)
Critical Low Battery Pop-up 0% ~ 3% : Every Level change popup (No call)
Power Of
f
1%
15) Battery indicator

3. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
3. TROUBLE SHOOTING
3.1 WCDMA Rx Part
3.1.1 WCDMA_B1/B8 Rx
Rx TEST SETUP
- DL Channel : 10700 / 3013
- Sector Power(dBm) : -23 / -23.5
1. Check
DC Power Supply circuit
START
2. Check MT6166 XO
3.Check RF Signal path
Re download S/W & Cal
* There are no Test Points on the IQ Data Line. So It is impossible to check the IQ Data Wave form.