LG -YD6250 Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Cell Phone
  5. LG-YD6250
  6. Service manual
LG -YD6250 Service Manual

LG -YD6250 Service Manual

Single band cdma mobile phone
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
CDMA MOBILE SUBSCRIBER UNIT
LG-YD6250
SERVICE MANUAL
SINGLE BAND
CDMA MOBILE PHONE

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the LG-YD6250 and is the answer not in the manual?

Questions and answers

Related Manuals for LG LG-YD6250

Summary of Contents for LG LG-YD6250

  • Page 1 CDMA MOBILE SUBSCRIBER UNIT LG-YD6250 SERVICE MANUAL SINGLE BAND CDMA MOBILE PHONE...

  • Page 2: Table Of Contents

    LG-YD6250 Table of Contents General Introduction ........................2 CHAPTER 1. System Introduction 1. System Introduction ......................... 3 2. Features and Advantages of CDMA Mobile Phone ..............4 3. Structure and Functions of CDMA Mobile Phone ..............7 4. Specification ..........................8 5.

  • Page 3: General Introduction

    LG-YD6250 General Introduction The LG-YD6250 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-YD6250 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: Features And Advantages Of Cdma Mobile Phone

    LG-YD6250 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 6 LG-YD6250 Moreover, the backward closed loop power control used by the mobile station to control power with the commands issued out by the cell site. The cell site receives the signal of each corresponding mobile station and compares this with the pre-set threshold value and then, issues out power increase/decrease commands to the corresponding mobile station every 1.25 msec (800 times per...
  • Page 7 LG-YD6250 2.6 Frequency Re-Use and Sector Segmentation Unlike the existing analog cellular system, the CDMA system can reuse the same frequency at the adjacent cell and accordingly, there is no need to prepare a separate frequency plan. Total interference generated on mobile station signals received from the cell site is the sum of interference generated from other mobile stations in the same cell site and interference generated from the mobile station of adjacent cell site.

  • Page 8: Structure And Functions Of Cdma Mobile Phone

    LG-YD6250 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 antenna is connected with the transmitter/receiver via a SAW duplexer filter so that it can carry out the transmit/receive function at the same time.

  • Page 9: Specification

    LG-YD6250 4. Specification 4.1 General Specification 4.1.1 Transmit/Receive Frequency Interval : 45MHz 4.1.2 Number of Channels (Channel Bandwidth) : 20CH (BW : 1.23MHz) 4.1.3 Operating Voltage : DC 3.2~4.2V 4.1.4 Battery Power Consumption : DC 3.7V SLEEP IDLE MAX POWER CDMA 1.2mA...
  • Page 10 LG-YD6250 4.2.3 Intermediate Frequency : Zero IF (MSM6100) 4.2.4 Sensitivity : -104dBm ( C/N 12dB or more) 3dB C/N Degration (With Fch ± 1.25KHz : -30dBm) 4.2.5 Selectivity : 4.2.6 Spurious Wave Suppression : Maximum of -80dB 4.2.7 CDMA Input Signal Range •...
  • Page 11 LG-YD6250 MS (Mobile Station) Transmitter Frequency FA NO. CH.NO. CENTER FREQUENCY FA NO. CH.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 842.040 MHz 830.790 MHz 843.270 MHz 832.020 MHz...

  • Page 12: Installation

    LG-YD6250 5. Installation 5.1 Installing a Battery Pack (Soft Pack type) 1) The soft battery pack is keyed so it can only fit one way. Align the groove in the battery pack with the rail on the back of the phone until the battery pack rests flush with the back of the phone.

  • Page 13: Chapter 2. Circuit Description

    LG-YD6250 CHAPTER 2. Circuit Description 1. RF Transmit/Receive Part 1.1 Overview The RF transmit/receive part employs the direct conversion architecture (ZIF, Zero Intermediate Frequency). The transmit/receive frequency is respectively 824.04~848.97MHz and 869.04~893.97 MHz. The block diagram is shown in [Figure 2-1].
  • Page 14 LG-YD6250 [Figure 2-1] Block Diagram Of YD6250 1.2 Description of Receive Part Circuit 1.2.1 Duplexer (DP100) The duplexer consists of the receive part bandpass filter (BPF) and the transmit part bandpass filter (BPF) which have the function of separating transmit/receive signals in the full duplex system using the transmit/receive common antenna.
  • Page 15 LG-YD6250 Parameter Gain Mode 0(G0) Gain Mode 1(G1) Gain Mode 2(G2) Gain Mode 3(G3) Unit Gain Noise Figure Input IP3 1.2.3 Rx RF SAW FILTER (F101) The main function of Rx RF SAW filter is to attenuate mobile phone spurious frequency, attenuate noise amplified by the LNA and suppress second harmonic originating in the LNA.
  • Page 16 LG-YD6250 signals are upconverted to the Cellular frequency bands and amplified to provide signal drive capability to the PAM. The RFT6122 includes an mixer for up-converting analog baseband to RF, a programmable PLL for generating Tx and Rx LO frequency, cellular driver amplifier and Tx power control through an 85 dB VGA.
  • Page 17 LG-YD6250 1.4.2 Voltage Controlled Oscillator (U107) The internal VCO signal of RFR6122 is processed by the LO generation and distribution circuits in RFR6122 to create Cellular quadrature downconverter’s LO signals. The LO signals applied at the mixer ports are at the frequency different than the VCO frequency. This assures that the VCO frequency is different than the RF frequency, an important consideration for Zero-IF processing.

  • Page 18: Digital/Voice Processing Part

    LG-YD6250 2. Digital/Voice Processing Part 2.1 Overview The digital/voice processing part processes the user's commands and processes all the digital and voice signal processing in order to operate in the phone. The digital/voice processing part is made up of a keypad/LCD, receptacle part, voice processing part, mobile station modem part, memory part, and power supply part.
  • Page 19 LG-YD6250 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 lights up through the use of 13 Blue LEDs and LCD backlights up through the use of 2 white LEDs.
  • Page 20 LG-YD6250 In addition, digital audio signals(PCM) outputted from MSM6100 are converted into analog signals after going through the audio codec. These signals are amplified with programmable gain on codec’s internal AMP and external MIDI Synthesizer, transferred to the ear-piece. 2.3.3 Memory Part The memory part consists of a MCP consist of 512Mbit NAND Flash and 256 SDRAM.
  • Page 21 LG-YD6250 [Figure 2-2] Block Diagram Of Power Management IC 2.3.5 Logic Part The Logic part consists of internal CPU of MSM6100, SDRAM, FLASH ROM. The MSM6100 receives TCXO (19.20MHz) clock signals from U101, and then controls the phone during the CDMA mode. The major components are as follows:...
  • Page 22 LG-YD6250 Flash Memory is used to store the program of the mobile station. Using the down-loading program, the program can be changed even after the mobile station is fully assembled. SDRAM is used to store the internal flag information, call processing data, and timer data.

  • Page 23: Chapter 3. Trouble Shooting

    LG-YD6250 CHAPTER 3. Trouble Shooting CHAPTER 3. Trouble Shooting CHAPTER 3. Trouble Shooting CHAPTER 3. Trouble Shooting 3.1 Rx Part Trouble 3.1 Rx Part Trouble 3.1.1 When Rx Power isn’t enough 3.1.1 When Rx Power isn’t enough Test Point Test Point...
  • Page 24 LG-YD6250 3.1.2 Checking Regulator Circuit Test Point Pin#10 (+2.6V_Rx) U400 Pin#1 High (PS_HOLD Figure 3-1-2 Circuit Diagram Checking Flow Check Pin 1 of U400 Check Pin 10 Changing Board +2.6V_Rx OK? Pin 1. High? of U400 PMIC Circuit is OK See...
  • Page 25 LG-YD6250 3.1.3 Checking VCTCXO Circuit Test Point Checking Flow Check U101 Pin#3 Pin#3 ◆ Refer to Graph 3-1-1(a) VCTCXO Circuit is Ok U101 19.2MHz OK? See next Page to check Duplexer Check U101 Pin# 4 Pin#4 ◆ Refer to Graph 3-1-1(b) +2.85V_TCXO OK?
  • Page 26 LG-YD6250 3.1.4 Checking Control Signal Test Point Pin#5 U107 Pin#4 Pin#3 Figure 3-1-4 Checking Flow Check Pin #3,#4,#5 Download the S/W Level is High? ◆ Refer to Graph 3-1-2(a,b) Check SBDT, SBCK SBST Check if there is Similar? Download the S/W Any Major Difference ◆...
  • Page 27 LG-YD6250 3.1.5 Checking Mobile SW & Duplexer (DCN) Test Point U100.Pin#2 U100.Pin#2 DP100.Pin#8 DP100.Pin#8 Figure 3-1-5 DP100.Pin#5 DP100.Pin#5 Circuit Diagram...
  • Page 28 LG-YD6250 Checking Flow Rx TEST SETUP(HHP) - Test Channel : 384(DCN), E5515C Setup - CH : 384(DCN) - Sector Power : -30 dBm Spectrum Analyzer Setting Oscilloscope Setting Check U100 Pin#2 Check if there is Any Major Difference Detected Signal? Changing U100 ◆...
  • Page 29 LG-YD6250 DP100 Pin #8 Graph 3-1-3(b) DP100 Pin #5 Graph 3-1-3(c)
  • Page 30 LG-YD6250 3.1.6 Checking Rx I/Q data Test Point U107 Figure 3-1-6 R135 R136 R137 R138 Waveform R135 (Rx_I_P) R135 (Rx_I_P) R136 (Rx_I_N) R136 (Rx_I_N) R138 (Rx_Q_P) R138 (Rx_Q_P) R137 (Rx_Q_N) R137 (Rx_Q_N) Graph 3-1-4(b) Graph 3-1-4(a) Checking Flow Check R138,R137,R136,R135...

  • Page 31: Tx Part Trouble

    LG-YD6250 3.2 Tx Part Trouble Test Point Mobile S/W Mobile S/W RFT6122 RFT6122 VCTXO VCTXO Duplexer Duplexer Figure 3-2 Checking Flow START START √ Press “ SPC Code ” in Phone idle state √ Press “ SPC Code ” in Phone idle state √...
  • Page 32 LG-YD6250 3.2.1 Check Regulator Circuit Test Point U400 Pin#15 U400 Pin#15 V_RF TX 2.6V V_RF TX 2.6V U400 U400 U106 U106 U106 Pin9 U106 Pin9 TX_ON(TP210) TX_ON(TP210) Figure 3-2-1(a) Figure 3-2-1(b) Circuit Diagram Pin 15 Pin 9 Checking Flow U400...
  • Page 33 LG-YD6250 3.2.2 Check VCTCXO Circuit Test Point Checking Flow Check U101 Pin#3 Pin#3 Pin#3 ◆ Refer to Graph3-2-1(a) VCTCXO Circuit is Ok U101 U101 19.2MHz OK? See next Page to check Duplexer Check U101 Pin# 4 Pin#4 Pin#4 ◆ Refer to Graph 3-2-1(b) +2.85V_TCXO OK?
  • Page 34 LG-YD6250 3.2.3 Check SBI Control Signal Test Point Pin#5 (R126,SBST) Pin#5 (R126,SBST) U107 U107 Figure 3-2-3 Circuit Flow Download the SW Check R126 Level is appear? Similar? Download the SW Control Signal is OK See next page to check RFT6122 Circuit...
  • Page 35 LG-YD6250 3.2.4 Check RFT6122 Circuit Test Point C174,C175 C174,C175 I/Q DATA I/Q DATA U106 Pin#23 U106 Pin#23 CELL_OUT CELL_OUT RFT6122 RFT6122 RFT6122 U106 U106 U106 Figure 3-2-4 U106 Pin#12 U106 Pin#12 TX_CP TX_CP Circuit Flow Check U201 Check C174,C175 I,Q Level is Appear?
  • Page 36 LG-YD6250 Circuit Diagram Pin 23 Pin 12 Waveform C174,C175 TX_I,Q DATA U106 Pin23 CELL_OUT Graph 3-2-3(a) Graph 3-2-3(b)
  • Page 37 LG-YD6250 3.2.5 Check PAM Circuit Test Point U104 Pin#2 U104 Pin#2 U104 Pin#1 U104 Pin#1 RF_IN RF_IN Vcc1 Vcc1 U102 Pin#2 U102 Pin#2 U104 Pin#8 U104 Pin#8 Vcc2 Vcc2 Q100 Q100 Q100 U104 Pin#7 U104 Pin#7 Q100 Pin#4 Q100 Pin#4...
  • Page 38 LG-YD6250 Circuit Flow Check F100 Input Level is Appear? Check U104 Pin#2 Vreg 2.6~2.8V Check U104 Pin#4 Check Q100,U401 Check U102 Pin#2 Level is Check U102 3.2V~4.2V OK? Level is Check U104 Pin #1, 8 Replace U104 3.2V~4.2V OK? Output Level...
  • Page 39 LG-YD6250 3.2.6 Check Duplexer & Mobile SW Test Point U100 Pin#1 U100 Pin#1 (ANT_OUT) (ANT_OUT) DP100 Pin#8 DP100 Pin#8 (DP→ANT TX s (DP→ANT TX s Figure 3-2-6 Circuit Flow Check DP 100 Pin#8 Replace DP100 Level is Appear? Check U100 Pin#1...

  • Page 40: Logic Part Trouble

    LG-YD6250 3.3 Logic Part Trouble 3.3.1 When power isn't "Turn On". Circuit Diagram Test Point Pin#12 Pin#28 U400 Pin#28 Pin#22 Figure 3-3-1 Pin#22 Pin#12 Checking Flow START Battery Volt < 3.2V Recharge Battery Check the Voltage at pin Change U400...
  • Page 41 LG-YD6250 3.3.2. When LCD isn't displayed. • LCD Control signal : F_D2[0:15], F_ LCD_RESET/, F_ L_ADS, F_LCD_CS/ , F_ LCD_WR/ Circuit Diagram Pin#1 Test Point F302 F301 F300 F303 Pin#1 L302) CON 301 Figure 3-3-2...
  • Page 42 LG-YD6250 Checking Flow START Refer Circuit to supply power nominal? to [1] The voltage at Pin #1 Resoldering L301 Of CON 301=2.85V? The voltage at Pin #1 Change the U400 Of CON 301=2.85V? Check the Control signal Check F300, F301, F302, F303...
  • Page 43 LG-YD6250 3.3.3. When Tx Audio (MIC) isn't transmitted. Circuit Diagram Test Point R421 C447 Figure 3-3-3 Checking Flow START MIC soldering Resoldering MIC Resoldering MIC Check voltage Change main board Change main board R421 (1.5~2.0V)? Check the Resoldering C447 Resoldering C447 Soldering of C447 Change MIC Ass’y...
  • Page 44 LG-YD6250 3.3.4. When Rx Audio (Receiver, Speaker) isn't heard. Circuit Diagram Test Point C432 Figure 3-3-4 Checking Flow START Receiver Reposition Receiver Reposition Receiver Contacting correctly correctly -Set RC3 & FCH Service Option (Fwd3,Rvs3) , SO3 (Voice) in 5515C -Set 1kHz Sine...
  • Page 45 LG-YD6250 3.3.5. When Keytone isn't heard. Please refer to the receiver part for circuit diagram and test point. • START Receiver Reposition Receiver Reposition Receiver Contacting correctly correctly Is Receiver Is Receiver Change Receiver Change Receiver Pin OK? Pin OK?
  • Page 46 LG-YD6250 3.3.6. When Sound doesn’t ring. Please refer to the speaker part for circuit diagram and test point. • START Speaker Reposition Speaker Reposition Speaker Contacting correctly correctly OK?? Sinewave Check or change U500 Check or change U500 Change the Board...
  • Page 47 LG-YD6250 3.3.7. When Vibrator, T-Flash , and USB interface doesn’t operate. 3.3.7.1 Vibrator Circuit Diagram Pin#2 Pin#3 Pin#2 Test Point Q402 Pin#2 Pin#2 Pin#3 Q403 Figure 3-3-5...
  • Page 48 LG-YD6250 Checking Flow START Vibrator Vibrator Does vibrator Reposition Vibrator Reposition Vibrator Good Contacting Contacting operate now? correctly correctly Set up manner mode Set up manner mode (vibrator activate) (vibrator activate) The voltage at Pin#2 Change main board Of Q402 is high?
  • Page 49 LG-YD6250 3.3.7.2 T-Flash Circuit Diagram Test Point R314(Pin#9) R315(Pin#3) R316(Pin#5) C306 R317(Pin#7) Figure 3-3-6...
  • Page 50 LG-YD6250 Checking Flow Setting : Insert TFlash card into the phone START The voltage at Pin#9 Change the main board is Low? The voltage at C306 Change the U400 (Pin#4) is 2.85V? The voltage at R315(Pin#3) Change the main board...
  • Page 51 LG-YD6250 3.3.7.3 USB interface Circuit Diagram Test Point U400 X200 R200 Q400 Figure 3-3-7(b) R410 R409 Figure 3-3-7(a)
  • Page 52 LG-YD6250 Checking Flow START The voltage at Pin#2 Check the connection of USB cable Of Q400 is 5.0V? The voltage at Change the U400 Pin#11=1.65~3.6V? Check the soldering of The frequency of X200 Re-soldering X200,R200 X200,R200 is 48MHz? Replace X200,R200...
  • Page 53 LG-YD6250 3.3.8. When Camera isn’t displayed. Circuit Diagram Pin#1 Pin#2 Pin#3 Pin#6 Test Point Pin#1 Pin#3 Pin#6 CON500 Figure 3-3-8...
  • Page 54 LG-YD6250 Checking Flow START Is Camera module Reconnect to CON500 Connecting to CON500 Set up camera mode The voltage at Pin #1 Of CON500 =2.79~2.91V? Change the U400 The voltage at Pin#6 Of CON500 =1.5V? The signal is high at Pin#3...
  • Page 55 LG-YD6250 3.3.9. Charging Trouble Circuit Diagram Test Point Pin#37 CON305 Pin#36 U400 Figure 3-3-9(b) Q603 Pin#4 Figure 3-3-9(a) Figure 3-3-9(c)
  • Page 56 LG-YD6250 Checking Flow SETTING : Connect the only charging adaptor (TA) to the phone START The Battery is Change the Battery Normal? Voltage at Pin#36 Pins of Re-soldering Pins Of Of U400 = 5.00V? CON305 well-soldered? CON305 The charging adaptor (TA)is out of order.

  • Page 57: Chapter 4. Safety

    LG-YD6250 CHAPTER 4. Safety ▣ 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. With it you can stay in contact with your office, your home, emergency service, and others. For the safe and efficient operation of your phone, observe these guidelines.
  • Page 58 LG-YD6250 ▣ 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. Replace a damaged antenna immediately. Consult your manual to see if you may change your antenna yourself.
  • Page 59 LG-YD6250 ▣ 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 60: Chapter 5. Glossary

    LG-YD6250 CHAPTER 5. 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 61 LG-YD6250 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 62 LG-YD6250 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 63 LG-YD6250 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 64 LG-YD6250 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 65 LG-YD6250 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 transferring communication of with a station mobile station from one base station to another.
  • Page 66 LG-YD6250 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 67 LG-YD6250 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 68 LG-YD6250 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 69 LG-YD6250 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 70 LG-YD6250 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 71 LG-YD6250 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 72 LG-YD6250 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 73 LG-YD6250 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 74: Chapter 6. Appendix

    LG-YD6250 CHAPTER 6. Appendix...
  • Page 76 YD6250 Functional Block Diagram YD6250 Functional Block Diagram □ □ U601 U106 MSM6100 Bluetooth Bluetooth RF Module (90n) F100 Bluetooth RF U108 U104 RF Transmitter LBRQ-2854 Baseband Tx RF SAW UART1 High Pwr Det Processor RFT6122 Connectivity B9003 MAX2205 SKY77162 UART2 Quadrature Test/Debug...
  • Page 77 TX Line RX Line RX Line Local Line...
  • Page 78 RX Line TX Line SPK & RCV...
  • Page 80 SPK & RCV...
  • Page 81 SPK & RCV Radio...
  • Page 84 CON403 2Pin Connector -Doesn't heard receiver CON301 33 Pin Connector -Main LCD doesn’t displayed LED701,LED702,LED703, LED704,LED705,LED706, LED707,LED708,LED709, LED710,LED711,LED712 LED713 Blue LED - No Keypad Backlight U406 Microphone Connector...
  • Page 85 CON501 EAR-MIC Jack -Doesn’t work Ear-Mic U100 RF Cable Connector CON300 T- Flash Card socket Dosen't detect SD card CON600 Side-Key connector - Side key buttern dosen't work U108 DP100 HDET DCN Duplexer - Low TX Power - No Service - No service - No Make Call U101...
  • Page 86 LG-YD6250 Component List 1. Accessory Design No. LG Part No. Description Q’ty Remark ENSY0015401 CONN,SOCKET MCEZ0001201 CASE MCJA0036002 COVER,BATTERY MHBY0000404 HANDSTRAP SBPL0081201 BATTERY PACK,LI-ION SGDY0007901 DATA CABLE EAR PHONE/EAR MIKE SGEY0003503 SMZY0011402 MODULE,ETC SSAD0020501 ADAPTOR,AC-DC MMBB0240201 MANUAL,OPERATION 2. Board Design No.
  • Page 87 LG-YD6250 2. Mechanical Part Design No. LG Part No. Description Q’ty Remark MBJL0036001 BUTTON,SIDE MCCC0039401 CAP,EARPHONE JACK MCCE0032301 CAP,RECEPTACLE MCCG0006501 CAP,MULTIMEDIA CARD MCJK0063601 COVER,FRONT MDAG0023301 DECO,FRONT MDAY0032301 DECO MFBC0028201 FILTER,SPEAKER MPBG0052101 PAD,LCD MPBN0035201 PAD,SPEAKER MPBZ0165601 MTAA0125201 TAPE,DECO MTAB0133501 TAPE,PROTECTION MTAB0133601...
  • Page 88 LG-YD6250 3. Main PCB 4-1 Main PCB Top Design No. LG Part No. Description Q’ty Remark L510 ELCH0010401 CHIP-INDUCTOR C432,C447 ECZH0000813 CHIP-CAPACITOR C525 ECCH0000143 CHIP-CAPACITOR C529 ECCH0000155 CHIP-CAPACITOR C520 ECTH0003701 TANTAL-CAPACITOR R511 ERHZ0000401 RESISTOR R701,R702,R703,R704, R705,R706,R708,R709, ERHZ0000464 RESISTOR R710,R711,R712,R721, R722...
  • Page 89 LG-YD6250 4-1 Main PCB Bottom Design No. LG Part No. Description Q’ty Remar ELCH0004723 L118 MULTILATER-CHIP-INDUCTOR ELCH0004708 L115,L116 MULTILATER-CHIP-INDUCTOR ELCH0004706 L103,L105 CHIP-INDUCTOR L102,L106 ELCH0004701 CHIP-INDUCTOR L108 ELCH0004710 CHIP-INDUCTOR ELCH0009105 L503,L505 COIL-INDUCTOR ELCH0004716 L107 CHIP-INDUCTOR ELCH0004722 L110,L113 MULTILATER-CHIP-INDUCTOR ELCH0004717 L111,L112 CHIP-INDUCTOR...
  • Page 90 LG-YD6250 ECCH0000157 C442,C443 CHIP-CAPACITOR ECCH0000179 C218,C219,C220,C221 CHIP-CAPACITOR ECCH0000161 C153,C170,C303,C544 CHIP-CAPACITOR ECCH0002002 C104,C207,C521 CHIP-CAPACITOR C102,C124,C132,C133, C134,C135,C138,C141, C143,C144,C145,C146, C147,C161,C163,C164, ECCH0002001 CHIP-CAPACITOR C226,C306,C412,C436, C437,C441,C444,C505, C507,C508,C524,C536, C537,C538,C540,C602 ECZH0004402 C541 CHIP-CAPACITOR ECZH0001217 C516 CHIP-CAPACITOR C166,C301,C302,C304, C305,C401,C405,C407, C408,C411,C417,C425, ECZH0001215 CHIP-CAPACITOR C426,C433,C438,C509, C518,C519,C539,C542, C543,C545,C605 ECZH0001504 C202 CHIP-CAPACITOR...
  • Page 91 LG-YD6250 ERHZ0000499 R505 RESISTOR ERHZ0003202 R127 RESISTOR ERHZ0000346 R141 RESISTOR ERHZ0000203 R129,R422,R423 RESISTOR R109,R155,R202,R209, ERHZ0000405 R210,R303,R401,R402, RESISTOR R507,R613,R617,R630 ERHZ0000351 R124 RESISTOR R518,R519 ERHZ0000212 RESISTOR R315,R317,R614,R639 ERHZ0000444 RESISTOR ERHZ0000281 R156 RESISTOR ERHZ0000460 R506 RESISTOR ERHZ0000287 R306 RESISTOR R211,R408,R415,R618, ERHZ0000486 RESISTOR R621...
  • Page 92 LG-YD6250 SMZY0012601 U601 BLUETOOTH ELCH0010401 L508,L509 CHIP-INDUCTOR EUSY0220901 U504 AUDIO-POWER-AMP EUSY0215801 U502 AUDIO-POWER-AMP U400 EUSY0284701 PMIC U108 EUSY0219401 RF-POWER-DETECTOR EXXY0004602 X501 RESONATOR ELCP0008001 L401 POWER-INDUCTOR EUSY0152202 U200 MSM6100-90NM SETY0001401 R158 THERMISTOR U602 EUSY0263801 UHS-TRIPLE-BUFFER U503 EUSY0227301 FM_stereo_radio_IC ENSY0014401 CON500 CAMERA-CONNECTOR...

Table of Contents