LG -UD90c Service Manual
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LG -UD90c Service Manual

LG -UD90c Service Manual

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CDMA PORTABLE CELLULAR PHONE
LG-UD90c
SERVICE MANUAL

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Summary of Contents for LG LG-UD90c

  • Page 1 CDMA PORTABLE CELLULAR PHONE LG-UD90c SERVICE MANUAL...

  • Page 2: Table Of Contents

    LG-KG90C Table of Contents General Introduction CHAPTER 1. System Introduction 1. System Introduction ........................2. Features and Advantages of CDMA Mobile Phone ................ 3. Structure and Functions of CDMA Mobile Phone ................4. Specification ..........................CHAPTER 2. NAM Input Method(Inputting of telephone numbers included) 1.

  • Page 3: General Introduction

    LG-KG90C General Introduction The LG-UD90C cellular phone functions as digital cellular phone worked in CDMA (Code Division Multiple Access) mode. CDMA mode applies the DSSS (Direct Sequence Spread Spectrum) technique that has been used in military. This technique enables to share one frequency channel with many users in the same specific area.

  • Page 4: Chapter 1. System Introduction

    LG-KG90C CHAPTER 1. System Introduction 1. System Introduction 1.1 CDMA Abstract The cellular system has a channel hand-off function that is used for collecting the information on the locations and movements of radio mobile telephones from the cell site by automatically controlling several cell site through the setup of data transmission routes and thus, enabling one switching system to carry out the automatic remote adjustment.
  • Page 5 LG-KG90C Another method available is to make two persons to sing in different languages at the same time, space, and frequency when wishing to let the audience hear the singing without being confused. This is the characteristics of CDMA. On the other hand, when employing the CDMA technology, each signal has a different pseudo-random binary sequence used to spread the spectrum of carrier.

  • Page 6: Features And Advantages Of Cdma Mobile Phone

    LG-KG90C 2. Features and Advantages of CDMA Mobile Phone 2.1 Various Types of Diversities When employing the narrow band modulation (30kHz band) that is the same as the analog FM modulation system used in the existing cellular system, the multi-paths of radio waves create a serious fading.
  • Page 7 LG-KG90C The backward open loop power control is carried out in a corresponding mobile station; the mobile station measures power received from the cell site and then, reversely increases/decreases transmit power in order to compensate channel changes caused by the forward link path loss and terrain characteristics in relation to the mobile station in the cell site.
  • Page 8 LG-KG90C 2.5 Soft Handoff During the soft hand, the cell site already in the busy state and the cell site to be engaged in the call later participate in the call conversion. The call conversion is carried out through the original call connection cell site, both cell sites, and then, new cell site.

  • Page 9: Structure And Functions Of Cdma Mobile Phone

    LG-KG90C 3. Structure and Functions of CDMA Mobile Phone The mobile station of CDMA system is made up of a radio frequency part and logic/control (digital) part. The mobile station is fully compatible with the existing analog FM system. The mobile station antenna is connected with the transmitter/receiver via a duplexer filter so that it can carry out the transmit/receive function at the same time.

  • Page 10: Specification

    LG-KG90C 4. Specification 4.1 General Specification 4.1.1 Transmit/Receive Frequency Interval 1) CDMA: 45MHz 4.1.2 Number of Channels (Channel Bandwidth) 1) CDMA : 20 CH (BW: 1.23MHz) 4.1.3 Operating Voltage : DC 3.7V 4.1.4 Battery Power Consumption : DC 3.7V SLEEP...
  • Page 11 LG-KG90C 4.2 Receive Specification 4.2.1 Frequency Range CDMA : 869.820 MHz ~ 893.190 MHz 4.2.2 Local Oscillating Frequency Range 1664.7MHz ~1787.94MHz 4.2.3 Zero Intermediate Frequency 4.2.4 Sensitivity CDMA : -104dBm (C/N 12dB or more) 4.2.5 Selectivity CDMA : 3dB C/N Degration (With Fch±1.25 kHz : -30dBm) 4.2.6 Spurious Wave Suppression : Maximum of -80dB...
  • Page 12 LG-KG90C 4.3 Transmit Specification 4.3.1 Frequency Range CDMA : 824.820MHz ~ 848.190MHz 4.3.2 Local Oscillating Frequency Range 1649.64MHz ~1696.38MHz 4.3.3 Zero Intermediate Frequency 4.3.4 Output Power CDMA : 0.32W 4.3.5 Interference Rejection 1) Single Tone : -30dBm at 900 kHz 2) Two Tone : -43dBm at 900 kHz &...
  • Page 13 LG-KG90C MS (Mobile Station) Transmitter Frequency CH.NO CH.NO FA NO. CENTER FREQUENCY FA NO. CENTER FREQUENCY 1011 824.640 MHz 837.120 MHz 825.870 MHz 838.350 MHz 827.100 MHz 839.580 MHz 828.330 MHz 840.810 MHz 829.560 MHz 842.04 MHz 830.790 MHz 843.270 MHz 832.020 MHz...

  • Page 14: Chapter 2. Nam Input Method(Inputting Of Telephone Numbers Included)

    LG-KG90C CHAPTER 2. NAM Input Method (Inputting of MIN included) 1. HOW TO POWER UP 1. Press power key. 2. You have to input correct PIN code[Default Code: 0000], then press [OK] key. 3. Handset start data loading process, and then searching signal.

  • Page 15: Chapter 3. Circuit Description

    LG-KG90C CHAPTER 3. Circuit Description 1. RF Transmit/Receive Part 1.1 Overview The Tx and Rx part employs the Direct-Conversion system. The Tx and Rx frequencies are 824.04~848.97 and 869.04~893.97. RF signals received through the antenna are seperated by the duplexer.

  • Page 16: Digital/Voice Processing Part

    LG-KG90C 1.3 Description of Frequency Synthesizer Circuit 1.3.1 Temperature Compensated Crystal Oscillator (TCXO, X1100) Operating temperature is -30~+85 ° C. The receives frequency tuning signals called TRK_LO_ADJ from MSM as 2.66V~2.94V DC via R and C filter in order to generate the reference frequency of 19.2 MHz and input it into the frequency synthesizer.
  • Page 17 LG-KG90C 2.2.4 Memory Part The memory part is made up of a flash memory, SDRAM for storing data. 2.3 Circuit Description 2.3.1 Keypad/LCD and Receptacle Part Once the keypad is pressed, the key signals are sent out to MSM6100 for processing. In addition, when the key is pressed, the keypad/LCD lights up through the use of LEDs.
  • Page 18 LG-KG90C scrambled by the long code PN sequence of the user in order to ensure the confidentiality of calls. Moreover, binary quadrature codes are used based on walsh functions in order to discern each channel. Data created thus are 4-phase modulated by one pair of Pilot PN code and they are used to create I and Q data.
  • Page 19 LG-KG90C 2.3.7 Logic Part The Logic part consists of internal CPU of MSM6100, MCP(SRAM& FLASH MEMORY) . The MSM6100 receives TCXO (=19.2MHz) and controls the phone in both CDMA and FM modes. The major components are as follows: CPU : ARM926EEJ-S microprocessor core MEMORY : •...

  • Page 20: Trouble Shooting

    LG-KG90C CHAPTER 4. Trouble Shooting LG-UD90C MAIN TOP LG-UD90C MAIN BOTTOM...
  • Page 21 LG-KG90C 1. When power isn't "Turn On". Checking Flow - U1303 : MAX1827 (PMIC) - U1201 : MSM6100 - X1100 : TG-5000(TCXO) START Rechange Supply Voltage 3.2 V~ 4.2 V Battery Is U1303 No.10-pin Check U1201(MSM6100) High(PS_Hold Check) Is U1303 No.12-pin Change U1303(MAX1827) 2.6 V?
  • Page 22 LG-KG90C Circuit Diagram Test Point 1.85V_MSMC U1303 MAX1827 PS_HOLD 2.6V_MSMP...
  • Page 23 LG-KG90C Waveform (TCXO) TCXO_OUTPUT X1100...
  • Page 24 LG-KG90C 2. When LCD isn't displayed. Checking Flow - CON3000 : 70-pin Connector - CON1501, CON1502 : 60-pin connector - CON3102 : 35-pin connector - F1501~1505 : EMI Filter - U1201 : MSM6100 - U3100 : LED charge-pump START Supply Voltage,...
  • Page 25 LG-KG90C Test Point Vout_BL U3100 Waveform CON601 No 18 , 19 : 2.8V_L , 2.65V_MSMP...
  • Page 26 LG-KG90C 3. When Camera isn’t activated. Checking Flow - CON3100 : 24-pin Connector - U3101, U3102, U3103 : LDO - F3101, F3102 : EMI Filter - X3100 : XTAL oscillator START Reconnecting Is CON3100 and FPCB Connecting OK ? CON3100,FPCB...
  • Page 27 LG-KG90C Test Point CON3100 X3100 pin3 X3100 Circuit Diagram...
  • Page 28 LG-KG90C 4. When MIC isn't activated. Checking Flow - R1209 : Mic Bias resistor - U1201 : MSM6100 START Re-Soldering MIC Is MIC soldering OK ? Re-work R2047, R2048 Are R2047, R2048 OK? Are R1209, C1220, C1221 Rework them Check U1201 (MSM6100)
  • Page 29 LG-KG90C Test Point MSM6100 R211 : Mic bias resistor Circuit Diagram...
  • Page 30 LG-KG90C 5. When Receiver(Earpiece) isn't heard. Checking Flow...
  • Page 31 LG-KG90C Test Point R3000, R3001 U1409 Circuit Diagram...
  • Page 32 LG-KG90C 6. When the vibrator does not work Checking Flow - Q3000 : DTC114EE-TL START Vibrator working Motor wire re-soldering Check Motor Wire soldering Check TP3001 Check FPCB, & change it High(motor EN) ? Change Q3000, Check motor terminal PAD+ High ?
  • Page 33 LG-KG90C Test Point Motor pad + MOTOR_EN (TP3001) Circuit Diagram...
  • Page 34 LG-KG90C 7. When backlight isn’t turned on Checking Flow - U405 : SM8133BB - U2001 : D3818 START go menu->display->backlight -setting Touch Backlight : 1) 1.Light : Maunual Keypad Backlight: 2) 2.MainLCD : Light 3.Button : 10 sec Re-soldering, or change...
  • Page 35 LG-KG90C Test Point U2001 Circuit Diagram...
  • Page 36 LG-KG90C 8. When UIM isn’t operating Checking Flow - CON2000 : 6099-06G - U1303 :MAX1827 - U1201 : MSM6100 START Re-soldering CON2000 Check CON2000 soldering? Check U1303 IS CON2000 pin1 2.85V? Check U1201(MSM) Circuit...
  • Page 37 LG-KG90C Test Point CON2000 Circuit Diagram...
  • Page 38 LG-KG90C 9. When Bluetooth isn’t operating - U2000 : Bluetooth module - U1201 : MSM6100 START Change Bluetooth Check contact of Bluetooth Antenna, and make it Antenna contact right Check U2000, & circuit Re-work U2000, & circuit around it Re-connect, or change...
  • Page 39 LG-KG90C Test Point Blue U2000 Tooth Circuit Diagram...
  • Page 40 LG-KG90C 10. When Ear jack & Ear Mic isn’t operating - CON1401 : HSEJ-18S04-25R - U1201 : MSM6100 - U1403 : MAX4410EBE - U1402 : FSA2267L10X START - U1401 : YMU765-QZE2 Connect Ear MIC & Ear JACK Check CON1401 Every pin Re-Soldering CON1401 OPEN or SHORT.
  • Page 41 LG-KG90C Test Point U1403 1401 U1409 U1401 Circuit Diagram...
  • Page 42 LG-KG90C 11. When Tx power isn't good enough Checking Flow Test Point...
  • Page 43 LG-KG90C U1106 U1107 U1101 X1100 Circuit Diagram...
  • Page 44 LG-KG90C Waveform...
  • Page 45 LG-KG90C 12. When Rx sensitivity isn't good enough Checking Flow - U1303 : MAX1827(PMIC) - X1100 : TG-5000(TCXO) - U1107 : CP0603A08368NTR(Coupler) -Rx Test setup - U1101 : YGHF-D010A ( RF module) 1.Mode offline-d - U1201 : MSM6100 2.CH “400”...
  • Page 46 LG-KG90C Test Point U1107 U1101 X1100 Circuit Diagram...
  • Page 47 LG-KG90C Waveform Base Station -Ch : 400 -Sector Power : -30dBm Spectrum Analazer -Detecting Frequency : 882MHz -Detecting Power : -35dBm...
  • Page 48 LG-KG90C ORTANT CHAPTER 5. Safety Read This Information Before Using Your Hand-Held Portable ▣ IMPORTANT Read This Information Before Using Your Hand-Held Portable Cellular Telephone First introduction in 1984, the hand-held portable cellular telephone is one of the most exciting and innovative electronic products ever developed.
  • Page 49 LG-KG90C Do not hold the antenna when the phone is “IN USE”. Holding the antenna affects call quality and may cause the phone to operated at a higher power level than needed. ▣ Antenna Care and Replacement Do not use the phone with a damaged antenna. If a damaged antenna comes into contact with skin, a minor bum may result.
  • Page 50 LG-KG90C on the ground. Using your phone while the plane is in the air. ▣ Children Do not allow children to play with your phone. It is not a toy. Children could hurt themselves or others (by poking themselves or others in the eye with the antenna, for example). Children also could damage the phone, or make calls that increase your telephone bills.
  • Page 51 LG-KG90C CHAPTER 6. Glossary General Terms Abbreviated Alert. An abbreviated alert is used to remind the mobile station user that previously selected alternative routing features are still active. AC. See Authentication Center. Access Attempt. A sequence of one or more access probe sequences on the Access Channel containing the same message.
  • Page 52 LG-KG90C A-key. A secret, 64-bit pattern stored in the mobile station. It is used to generate update the mobile station’s Shared Secret Data. The A-key is used in the mobile station authentication process. Analog Access Channel. An analog control channel used by a mobile station to access a system to obtain service.
  • Page 53 LG-KG90C Call Disconnect. The process that releases the resources handling a particular call. The disconnect process beings either when the mobile station user indicates the end of the call by generating an on-hook condition or other call release mechanism, or when the base station initiates a release.
  • Page 54 LG-KG90C DBc. The ratio(in dB) of the sideband power of a signal, measured in a given bandwidth at a given frequency offset from the center frequency of the same signal, to the total inband power of the signal. For CDMA, the total inband power of the signal is measured in a 1.23MHz bandwidth around the center frequency of the CDMA signal.
  • Page 55 LG-KG90C Extended Protocol. An optional expansion of the signaling message between the base station and mobile station to allow for the addition of new system features and operational capabilities. Fade Timer. A timer kept by the mobile station as a measure of Forward Traffic Channel continuity. If the Fade timer expires, the mobile station drops the call.
  • Page 56 LG-KG90C Half Frame. A 10 ms interval on the paging Channel. Two half frames comprise a frame, the first half frame begins at the same time as the frame. Handoff. The of transferring communication whth a station mobile station from one base station to another.
  • Page 57 LG-KG90C LSB. Least significant bit. Maximal Length Sequence (m-Sequence). A binary sequence of period 2n-1, n a positive integer, with no internal periodicities. A maximal length sequence can be generated by a tapped n-bit shift register with linear feedback. Mcps. Megachips per second (10 chips per second).
  • Page 58 LG-KG90C or each repeated code symbol (when the data rate is less than 9600bps) is one modulation symbol. Ms. Millisecond. MSB. Most significant bit. MSC. See Mobile Switching Center. Multiplex Option. The ability of the multiplex sublayer and lower layer to be tailored to provide special capabilities.
  • Page 59 LG-KG90C Order. A type of message that contains control codes for either the mobile station or the base station. Ordered Registration. A registration method in which the base station orders the mobile station to send registration related parameters. Overhead Message. A message sent by the base station on the Paging Channel to communicate base-station-specific and system-wide information to mobile station.
  • Page 60 LG-KG90C Pilot PN Sequence. A pair of modified maximal length PN sequences with period 2 used to spread the Foward CDMA Channel and the Reserve CDMA Channel. Different base station are identified by different pilot PN sequence offsets. Pilot PN Sequence Offset Index. The PN offset in units of 64 PN chips of a pilot, relative to the zero offset pilot PN sequence.
  • Page 61 LG-KG90C See IEEE Standard 269-1992, IEEE Standard 661-1979, CCITT Recommendation P.76, and CCITT Recommendation P.79. Registration. The process by which a mobile station identifies its location and parameters to a base station. Registration Zone. A collection of one or more base stations treated as a unit when determining whether a mobile station should perform zone-based registration.
  • Page 62 LG-KG90C Seizure Option. A service capability of the system. Service options may be applications such as voice, data, or facsimile. Shard Secret Data (SSD). A 128-bit pattern stored in the mobile station (in semi-permanent memory) and known by the base station. SSD is a concatenation of two 64-bit subsets: SSD_A, which is used to support the authentication procedures and SSD_B, which serves as one of the inputs to the process generating the encryption mask and private long code.
  • Page 63 LG-KG90C Termination Status. Indicates whether a mobile station must terminate the call when it is on an analog voice channel. Supervisory Audio Tone (SAT). One of three tones in the 6 kHz region that is transmitted on the forward analog voice channel by a base station and transponder on the reverse analog voice channel by as mobile station.
  • Page 64 LG-KG90C by the base station and is characterized by the use of a challenge-specific random number(i.e., RANDU) instead of the random variable broadcast globally(RAND). Unique Random Variable(RANDU). A 24-bit random number generated by the base station in support of the Unique Challenge-Response procedure.
  • Page 65 UD90c RF Block Diagram Tx_SBI RF Single Package Module Tx_IQ TCXO MSM6100-90NM HDET Rx_IQ YGHF-DO10A Rx_SBI...
  • Page 66 Speaker voice Rx Pass Rx Path Tx Path MIDI MIC Path RX : 824Mhz ~ 849Mhz TX : 869Mhz ~ 894Mhz...
  • Page 68 R1356,R1357:DNI ->560k R1317:DNI->200K 변경 5/1일 R1335,R1336: 47K -> 10k변경 (5/1)일...
  • Page 69 MIDI L1404,L1405 :220n ->1K(1608) R1434,R1437 : 10k -> 1K(1005) R1436,R1435 : 10k -> 56k(1005) 변경 (5/1일)
  • Page 70 C1510 :100n -> 0.1uF 변경 (5/1일)
  • Page 73 C2010 : 10n ->6.8n 5/1일 변경...
  • Page 75 U1201 U1301 U1403 MSM6100 Memory H.P analog S/W No power on No booting No earmic. sound phone malfunction U1401 MIDI No MIDI sound...
  • Page 76 CON1401 U1101 X1100 MMI connector U1303 RF MCM TCXO No MD connection PMIC No service No booting U1100 No charging No power on Not enough Tx power Not bluetooth working RF mobile switch No earphone sound No charging Not good sensitivity No service No Service...
  • Page 77 U3100 Charge pump Not LCD backlight on...
  • Page 78 CON3100 Q3000,Q3100 Camera connector Camera not work Vibrator not work X3100 XTAL Camera not work CON3001 Touch connector Touch not work...
  • Page 79 M2001 Microphone MIC not work...
  • Page 80 U2001 Lamp driver IC EL Backlight not work CON2000 UIM card socket UIM not work U2000 Bluetooth module BT not work...
  • Page 81 U4009 Touch sensor Touch key not work...

  • Page 83: Accessories List

    MMBB0212001 MANUAL,OPERATION 1 MPAC0004202 PACKING,ETC Export Son 80-Phone Case 테크노힐 SBPP0015302 BATTERY PACK,LI-PO 2 383450-BK 3.7 V,800 mAh,1 CELL,PRISMATIC ,LG-KX806 BATT, CHN Label, Pb-Free SGDY0010802 DATA CABLE LG-MLA300 LG-MLA300 ,18pin to 18pin + 18pin(Handy strip type) SGDY0010901 DATA CABLE LG-US03K LG-US03K ,18pin USB DataCable 씨에스엘정보통신주식회...
  • Page 84 KG90c_PCB_LIST Zuken)Desig-No Component-Name Desc/Remark Maker-PN ItemNo Size Value Tolerance 10 PCB Key PCB LG_DMC SPEY0040701 11 PCB SUB_PCB LG_DMC SPJY0023301 12 PCB MAIN_PCB LG_DMC SPFY0120801 13 PCB VOLUMKEY G_FLEX SPKY0028901 14 PCB POWERKEY G_FLEX SPJY0023301 15 PCB TOUCHKEY G_FLEX SPEY0041601 16 PCB FPCB G_FLEX...
  • Page 85 LG GSM T5100-PROJECT UD90C Mechanical Part List KG90c (중국,CDMA) HANDSTRP TYPE, P/N 구 분 PART NAME 수량 FILM INMOLD AWAZ00084 BFAA0039601 AWAZ00084 AWAZ00084 WINDOW ASSY, LCD MWAC0067501 WINDOW, LCD (IMD) (IMD) (IMD) COVER,SLIDE(UPPER) MCJW0006901 FILTER,SPEAKER MFBC0019701 PAD,LCD MPBG0041301 COVER ASSY,...
  • Page 86 UD90c_SUB_REV11_TOP Qty Size Value Tolerance NO Zuken)Desig-No Component-Name Desc/Remark Maker-PN ItemNo 1 1005 +/-10% 1 C3100 MCH153CN103KK CHIP-CAPACITOR ROHM ECCH0000155 1 1005 100n +/-10% 2 C3103 C1005JB0J104KT CHIP-CAPACITOR ECCH0002001 2 1005 +/-10% 3 C3106,C3120 GRM155R60J105KE19D CHIP-CAPACITOR MURATA ECCH0004904 1 1608 2.2u +/-10% 4 C3001...
  • Page 87 UD90c_SUB_REV11_BOT NO Zuken)Desig-No Qty Size Value Component-Name Desc/Remark Maker-PN ItemNo Tolerance 1 C3000,C3112 2 1005 MCH153CN103KK CHIP-CAPACITOR ROHM ECCH0000155 +/-10% 2 C3107,C3108,C3109 3 1005 0.1u GRM36X5R104K10PT CHIP-CAPACITOR MURATA ECCH0000182 +/-10% 3 C3113 1 1005 GRM155R60J105KE19D CHIP-CAPACITOR MURATA ECCH0004904 +/-10% 4 D3002 1 1608 2.2u GRM39X5R225K16...
  • Page 88 24 R2037 ICVL0518100Y500FR VARISTOR INNOCHIPS SEVY0004301 1 1005 18V-10p 25 R2017,R2018,R2030 ICVL0518400V500FR VARISTOR INNOCHIPS SEVY0004401 3 1005 18V-40p R2002,R2003,R2009,R2010,R2011,R2020,R2021,R2041 EVLC5S02100 CHIP-VARISTOR AMOTECH SEVY0005202 10 1005 100p-5.5V ,R2043,R2046 27 L2000 KNH21104 EMI-FILTER KYOCERA SFEY0001602 28 U2000 LBRQ-2B54-SA Bluetooth-RF-Module LG-INNOTEK SMZY0008701 1 4.0X5.0X1.35...

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