LG KE500 User manual

Date: May, 2007 / Issue 1.0
Service Manual Model : KE500/ME550c
Service Manual
KE500/ME550c

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1. General Description........................ 5
2. Performance .................................... 6
2.1 Product Name ......................................... 6
2.2 Supporting Standard................................6
2.3 Main Parts : GSM Solution...................... 6
2.4 HW Feature..............................................7
2.6 Technical Specification ..........................12
3. Circuit Description........................ 17
3.1 General Description .............................. 17
3.2 RF Part.................................................. 17
3.3 Digital Baseband....................................24
3.4 Analog Baseband.................................. 32
3.5 Bluetooth Interface................................ 40
4. TROUBLE SHOOTING .................. 43
4.1 RF Part Technical Brief......................... 43
4.2 RF Part Trouble shooting...................... 49
4.3 Bluetooth Trouble Shooting .................. 57
4.4 Baseband Part Troubleshooting ........... 61
4.5 LCD Display Trouble............................. 68
4.6 Camera Trouble Shooting..................... 73
4.7 Flash LED Trouble Shooting................. 79
4.8 SIM Detect Trouble Shooting................ 82
4.9 Slide Up/Down and Trouble Shooting... 85
4.10 Speaker/Receiver Trouble Shooting
(Common Path)................................... 87
4.11 Speaker/Receiver Trouble Shooting
(Acoustic Path).................................... 90
4.12 MIC Trouble Shooting ......................... 91
4.13 Ear-Mic Jack Detection
Trouble Shooting................................. 93
4.14 Ear-Mic Hook Detection
Trouble Shooting................................. 94
4.15 Ear-Mic Headset MIC
Trouble Shooting................................. 95
4.16 Ear-Mic Headset HSOR/HSOL
Trouble Shooting..................................96
4.17 FM-Radio Trouble Shooting.................98
4.18 Transflash Trouble Shooting................99
4.19 Main Key Backlight LED Trouble
Shooting.............................................101
4.20 Slide Key Backlight LED Trouble
Shooting.............................................103
4.21 Vibrator Trouble Shooting..................104
5. Downloading Software ............... 105
5.1 The purpose of downloading software 105
5.2 The Environment of Downloading
Software.............................................. 103
5.3 Download Procedure ...........................107
6. BLOCK DIAGRAM ....................... 114
7. CIRCUIT DIAGRAM ..................... 117
8. PCB LAYOUT............................... 128
9. RF Calibration................................... 139
9.1 What’s the Rx Calibration?................ 139
9.2 What’s the Tx Calibration? ................ 139
9.3 Calibration program - HOT_KIMCHI ..140
12. EXPLODED VIEW &
REPLACEMENT PART LIST ..... 145
12.1 EXPLODED VIEW ............................ 145
12.2 Replacement Parts
<Mechanic component>.................... 147
<Main component> ........................... 151
12.3 Accessory ......................................... 166
Table of Contents

1. General Description
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The information in this manual is subject to change without notice and should not be construed as a
commitment by LGE Inc. Furthermore, LGE Inc.
reserves the right, without notice, to make changes to equipment design as advances in engineering
and manufacturing methods warrant.
✻ This manual provides the information necessary to install, program, operate and maintain the
ME550c.
1. General Description

2. Performance
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2. Performance
2.1 Product Name
ME550c : GPRS Class 10 / EDGE Class 10
2.2 Supporting Standard
2.3 Main Parts : GSM Solution
Item Feature Comment
Supporting Standard EGSM/DCS1800/PCS1900
with seamless handover
Phase 2+(include AMR)
SIM Toolkit : Class 1,2,3,E
Frequency Range EGSM TX : 880 - 915 MHz
EGSM RX : 925 - 960 MHz
DCS1800 TX : 1710 - 1785 MHz
DCS1800 RX : 1805 - 1880 MHz
PCS1900 TX : 1850 - 1910 MHz
PCS1900 RX : 1930 - 1990 MHz
Application Standard WAP 2.0, JAVA 2.0
Item Part Name Comment
Digital Baseband Neptune (D761811BZVL): TI
Analog Baseband Triton (TWL3029): TI
RF Chip B6PLD: RENESAS

2. Performance
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2.4 HW Feature
Item Feature Comment
Form Factor Slide
1) Capacity
Battery Standard : Li-Polymer, 800mAh
2) Packing Type : Hard Pack
Size Standard :
97.0 X 47.0 X 14.9 mm
Weight 90g With Battery
Volume 75cc
PCB Staggered 10Layers , 0.8t
Stand by time 250 hrs @ Paging Period 5
Charging time 3 hrs @ Power Off / 800mAh
Talk time Min : 3.0 hrs @ Power Level 7 @ EGSM / 800mAh
EGSM : -105 dBm
RX sensitivity DCS 1800 : -105 dBm
PCS 1900 : -105 dBm
GSM/ EGSM : 33 dBm Class4 (EGSM)
GPRS DCS 1800 : 30 dBm Class1 (PCS)
TX output power PCS 1900 : 30 dBm Class1 (DCS)
EGSM : 27 dBm E2 (EGSM)
EDGE DCS 1800 : 26 dBm E2 (PCS)
PCS 1900 : 26 dBm E2 (DCS)
GPRS compatibility GPRS Class 10
EDGE compatibility EDGE Class 10
SIM card type Plug-In SIM
3V /1.8V
Main LCD
Display 262K Color TFT (176 x 220)
Backlight : White LED
Built-in Camera 2M CMOS Camera One button access

2. Performance
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Item Feature Comment
Status Indicator None
Alphanumeric Key : 12 Function Key:
Function Key : 9 4 Key Navigation, OK, F1,
Side Key : 4 F2, CLR, SND
Keypad Total No of Keys :25 Side Key :
Volume up/down, CAM,
PWR/END
ANT Main : Internal Fixed Type
Blue tooth : Internal Fixed Type
System connector 18 Pin
Ear Phone Jack 18pin, 4 Pole, Stereo
PC synchronization Yes
Memory NAND Flash : 1Gbit
SDRAM : 512Mbit
Speech coding FR, EFR, HR,AMR
Data & Fax Built in Data & Fax support
Vibrator Built in Vibrator
Blue Tooth V2.0, HSP, HFP, OPP, FTP(server),
BPP, A2DP, AVRCP
MIDI (for Buzzer Function) SW Decoded 64Poly
Music Player MP3/ AAC/AAC+ With Graphic EQ
Camcorder MPEG4, H.263, H.264
Voice Recording Yes
Speaker Phone mode Yes
Support
Travel Adapter Yes
CDROM Yes
Stereo Headset Yes Optional
Data Cable Yes Optional
T-Flash (External Memory) Yes Optional

2. Performance
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Item Feature Comment
RSSI 0 ~ 5 Levels
Battery Charging 0 ~ 4 Levels
Key Volume 0 ~ 5 Level
Audio Volume 1 ~ 5 Level
Time / Date Display Yes NITZ
Multi-Language Yes English / French
Quick Access Mode Phone Book / Message / Camera
/ My Stuff / Favorite
PC Sync Schedule / Phonebook / MEMO /
SMS / Download(Photo, file)
Speed Dial Yes (2~9) Voice mail center -> 1 key
Profile Yes
CLIP / CLIR Yes (different melody)
Phone Book 4 Numbers + 1 Memo + 1 e-mail + Total 1000 Member
Group Select + Picture
Last Dial Number Yes (40)
Last Received Number Yes (40)
Last Missed Number Yes (40)
Search by Number/Name Name only
Group 7Possible Rename
Fixed Dial Number Yes
Service Dial Number Yes
Own Number Yes
Voice Memo Yes
Call Reminder Yes
Network Selection Automatic
Mute Yes
Call Divert Yes
Call Barring Yes
Call Charge (AoC) No No for Cingular

2. Performance
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Item Feature Comment
Call Duration Yes
SMS (EMS) 100 (10) EMS : Release4
(Except Text align)
SMS Over GPRS Yes
EMS Melody / Picture Yes
Send / Receive / Save
MMS MPEG4 / Send / Yes
Receive / Save
Long Message MAX 925 Characters
Cell Broadcast Yes
Download Over the WAP
Game YES
Calendar Yes
Memo 50
Unit Convert Currency/Area/Length/Volume/Weigh
t/Temperature/Velocity
Tip Calculator No
Wall Paper Yes Default 5ea
WAP Browser Over WAP 2.0 Up Brower Obigo Q-line
Download Melody / Yes Over WAP
Wallpaper
SIM Lock Yes Operator Dependent
SIM Toolkit Class 1, 2, 3, A-E
MMS Yes Openwave MMS Client
EONS Yes
CPHS Yes V4.2
ENS Yes
Camera Yes 2M F/F / Digital Zoom : x4
JAVA Yes CLDC V1.1 / MIDP V2.0
Download Over WAP
Voice Dial No

2. Performance
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Item Feature Comment
IrDa No
V2.0
Blue tooth Yes HSP, HFP, OPP,
FTP(server),
BPP, A2DP, AVRCP
GPRS Yes Class 10
EDGE Yes Class 10
Hold / Retrieve No
Conference Call Yes Max. 6
DTMF Yes
Memo pad Yes
TTY No
AMR Yes
Sync ML No
IM No
Email No

2.6 Technical Specification
2. Performance
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Item Description Specification
GSM850
TX: 824 + n x 0.2 MHz (n=1 ~ 124)
RX: TX + 45 MHz
GSM900
TX: 890 + n x 0.2 MHz (n=1 ~ 124)
890 + (n-1024) x 0.2 MHz (n=975 ~ 1023)
RX: TX + 45 MHz
1Frequency Band DCS1800
TX: 1710 + ( n-511 ) x 0.2 MHz (n = 512 ~ 885)
RX: TX + 95 MHz
PCS1900
TX: 1850 + ( n-511 ) x 0.2 MHz
RX: 1930 + ( n-511 ) x 0.2 MHz (n = 512 ~ 810)
2Phase Error RMS < 5 degrees
Peak < 20 degrees
3Frequency Error < 0.1ppm
GSM850/GSM900
Level Power Toler. Level Power Toler.
533 dBm 2dB 13 17 dBm 3dB
631 dBm 3dB 14 15 dBm 3dB
729 dBm 3dB 15 13 dBm 3dB
827 dBm 3dB 16 11 dBm 5dB
925 dBm 3dB 17 9 dBm 5dB
10 23 dBm 3dB 18 7 dBm 5dB
11 21 dBm 3dB 19 5 dBm 5dB
4Power Level 12 19 dBm 3dB
DCS1800/PCS1900
Level Power Toler. Level Power Toler.
030 dBm 2dB 8 14 dBm 3dB
128 dBm 3dB 9 12 dBm 4dB
226 dBm 3dB 10 10 dBm 4dB
324 dBm 3dB 11 8 dBm 4dB
422 dBm 3dB 12 6 dBm 4dB
520 dBm 3dB 13 4 dBm 4dB
618 dBm 3dB 14 2 dBm 5dB
716 dBm 3dB 15 0 dBm 5dB

2. Performance
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Item Description Specification
GSM900
Offset from Carrier (kHz). Max. dBc
100 0.5
200 -30
250 -33
400 -60
600~ <1,200 -60
1,200~ <1,800 -60
1,800~ <3,000 -63
3,000~ <6,000 -65
5Output RF Spectrum 6,000 -71
(due to modulation) DCS1800/PCS1900
Offset from Carrier (kHz). Max. dBc
100 0.5
200 -30
250 -33
400 -60
600~ <1,200 -60
1,200~ <1,800 -60
1,800~ <3,000 -65
3,000~ <6,000 -65
6,000 -73
GSM900
Offset from Carrier (kHz) Max. (dBm)
Output RF Spectrum 400 -19
6(due to switching transient) 600 -21
1,200 -21
1,800 -24

2. Performance
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Item Description Specification
DCS1800/PCS1900
Offset from Carrier (kHz). Max. (dBm)
Output RF Spectrum 400 -22
6(due to switching transient) 600 -24
1,200 -24
1,800 -27
7Spurious Emissions Conduction, Emission Status
8Bit Error Ratio BER (Class II) < 2.439% @-102dBm
9Rx Level Report accuracy 3 dB
10 SLR 8 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -12 -
200 0 -
300 0 -12
11 Sending Response 1,000 0 -6
2,000 4 -6
3,000 4 -6
3,400 4 -9
4,000 0 -
12 RLR 2 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -12 -
200 0 -
300 2 -7
500 *-5
13 Receiving Response 1,000 0 -5
3,000 2 -5
3,400 2 -10
4,000 2
*Mean that Adopt a straight line in between 300 Hz and
1,000 Hz to be Max. level in the range.

2. Performance
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Item Description Specification
14 STMR 13 5 dB
15 Stability Margin > 6 dB
dB to ARL (dB) Level Ratio (dB)
-35 17.5
-30 22.5
-20 30.7
16 Distortion -10 33.3
033.7
731.7
10 25.5
17 Side Tone Distortion Three stage distortion < 10%
18 <Change> System frequency 2.5ppm
(13 MHz) tolerance
19 <Change>32.768KHz tolerance 30ppm
Full power
- 340mA(GSM900), < 260mA(DCS/PCS)
20 Power consumption Standby
- Normal mode ? 4.0mA(Max.power)
- Using Test mode on DSP Sleep function ? 6mA
GSM900/Lvl 7 (Battery Capacity 800mA) : 180 min
20 Talk Time GSM900/Lvl 12 (Battery Capacity 800mA) : 300 min
PCS1900/Level5 (Battery 800mA) : 310 Min
PCS1900/Level10(Battery 800mA) : 390 Min
Under conditions, at least 200 hours:
1. Brand new and full 800mAh battery
2. Full charge, no receive/send and keep GSM in idle mode.
21 Standby Time 3. Broadcast set off.
4. Signal strength display set at 3 level above.
5. Backlight of phone set off.
At least 70 dB under below conditions:
22 Ringer Volume 1. Ringer set as ringer.
2. Test distance set as 50 cm
23 Charge Voltage Fast Charge : < 550 mA
Slow Charge: < 60 mA

2. Performance
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Item Description Specification
Antenna Bar Number Power
5-85 dBm ~
4-90 dBm ~ -86 dBm
24 Antenna Display 3 -95 dBm ~ -91 dBm
2-100 dBm ~ -96 dBm
1-105 dBm ~ -101 dBm
0~-105 dBm
Barttey Bar Voltage
0(included Blinking) 3.65V~3.35V
1 3.71V ~ 3.66V
25 Battery Indicator 2 3.78V ~ 3.72V
3 3.91V ~ 3.79V
4 4.20V ~ 3.92V
26 Low Voltage Warning 3.60V↓0.03V (Standby)
3.50V↓0.03V (Call)
27 Forced shut down Voltage 3.35 0.03 V
1 Li-polymer Battery, Hardpack
28 Battery Type Standard Voltage = 3.7 V
Battery full charge voltage = 4.2 V
Capacity: 800mAh
Switching-mode charger
27 Travel Charger Input: 100 ~ 240 V, 50/60Hz
Out put: 4.8V, 900mA

3. Circuit Description
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3. Circuit Description
3.1 General Description
The RF part consists of a transmitter, a receiver, a synthesizer, a voltage supply and a DCXO part.
The main RF Chipset B6PLD is a highly integrated RF tranceiver IC FOR Digital Interface of GSM 850,
GSM900, DCS1800 and PCS1900 quad-band cellualr systems. The B6PLD incorporates EDGE
tranceiver apability, quad R low-noise amplifiers(LNSa). Direct conversion mixers, a programmable
gain amplifier(PGA) with DC offset and frequency response correction, ADC, Digital filiter, Digital
Interface, fully integrated VCOs, an RF fractiona-N synthesiser, a low-noise offset PLL transmitter,
Digital modulator, TXDAC, RAMPDAC, and AFCDAC. The B6PLD includes state machine control
through serial programming. All functions operate down to 2.67V and are housed in a 72-pin BGA
package. Hence the B6PLD can form a small size transceiver handset for quad band EDGE
tranceiver.
3.2 RF Part
3.2.1 Receiver Part
The B6PLD receiver supports quad band, so the front-end incorporates four LNAs and two mixers.
The incoming RF signals are mixed directly down to I/Q baseband by the front-end bolck. This
incorporates four LNAs/four buffers and two Gillbert Cell mixer blocks optimised for operation at
850MHz, 900MHz, 1800MHz and 1900MHz respectively. The front-end block is followed by two
closely matched baseband amplifier chains. These include distributed low pass filtering, one switched
gain stage and one fixed gain stage. In addition, the baseband section integrates A/D and D/A
converters which provide automatic on-chip correction of DC offsets.
<Fig.1> Receiver Part Block Diagram

3.2.1.1 Baseband PGA/Low pass Filter Specifications
The baseband programmable amplifier comprises one stage with variable gain followed by a fixed
gain amplifier. The overall gain control range is 36dB with 6dB Steps. The filtering is provided by a
single R/C low pass filter with an on-chip capacitor followed by on-chip Chebychev low pass filters.
The filters have been specified to achieve maximal group delay flatness in the pass-band combined
with the required levels of suppression of interfering signals. The distribution of the gain and filtering
has been designed to ensure that the receiver does not compress under blocking conditions. The
final fixed gain amplifier is included to match the on-chip levels to the input dynamic range of the
ADC.
3.2.1.2 DC offset auto-calibration system
B6PLD implements a system for cancelling the DC offsets in the baseband programmable gain
amplifiers(PGA). This prevents a small DC offset at the input giving a large DC offset at the output,
even at high gain settings. When the B6PLD receiver is performing an auto-calibration, the
sequencer cancels the offsets locally around the PGA, then the Digital filter. The system includes
switches to short out the signal path whilst the cancellation is occurring. The switches are opened in
sequence as the calibration progresses. For PGA the A/D converter system employs a successive
approximation technique and achieves 6 bit resolution. The PGA stage has an associated 6 bit
current DAC which cancels the DC offset at the output. The sequencer ensures that on-chip filters
have sufficient time to settle before applying correction in the next digital offset cancellation stage.
3. Circuit Description
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3. Circuit Description
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3.2.2 Transmitter part
The B6PLD transmitter is capable of both GMSK and 8-PSK modulation, to support for conventional
GSM and EDGE. B6PLD integrates all loop filters to configure both PM loop and AM loop. See block
diagram below.
3.2.2.1 Polar Loop Structure
Three main functions are identified in the transmitter architecture; I/Q vector modulation at IF
frequency, amplitude and phase loop at IF/RF frequencies and power amplification.
Fig. Simplified Block diagram for Tx part

3.2.3 RF Systhesiser
3.2.4 Front End Module Specification
3.2.4.1 Block Diagram and Internal Matching Condition
3. Circuit Description
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HWXR693

3. Circuit Description
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3.2.4.2 Logic Table for Selction
3.2.5 Power Amplifier Module
for Quad-band GSM/GPRS/EDGE
3.2.5.1 PAM Specification
-. Quad band GSM, GPRS & Ploar Loop EDGE Amplifier
-. For 3.5V nominal operation
-. Bulit-in LDO circuit
-. GPRS Class 12 operation compatible
-. Integrated directional coupler
3.2.5.2 Circuit Diagram and peripheral components
Select Mode Vc(GSM850/EGSM) Vc(DCS/PCS)
GSM850_Rx Low Low
EGSM_Rx Low Low
GSM850/EGSM_Tx High Low
DCS_Rx Low Low
PCS_Rx Low Low
DCS/PCS_Tx Low High
<Table> Band SW Logic Table
RPF09036B