LG KG270 Service Manual
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- LG KG270 | Service Manual - Page 1
Service Manual Model : KG270/MG160 Service Manual KG270/MG160 Date: April, 2007 / Issue 1.0 - LG KG270 | Service Manual - Page 2
Power On Trouble 54 4.4 SIM Card Trouble 56 4.5 Vibrator Trouble 58 4.6 Keypad Trouble 60 4.7 RTC Trouble 62 4.8. Key backlight Trouble 64 4.9. LCD Trouble 66 4.10. Microphone Trouble 69 4.11. Receiver Trouble 71 4.12 Speaker Trouble 73 4.13 Headphone Trouble 75 4.14 Charging Trouble 77 - LG KG270 | Service Manual - Page 3
-4- - LG KG270 | Service Manual - Page 4
, 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 - LG KG270 | Service Manual - Page 5
manual are for illustrative purposes only; your actual hardware may look slightly different. G. Interference and Attenuation Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference from unsuppressed engines or electric motors may cause problems. H. Electrostatic - LG KG270 | Service Manual - Page 6
2.1 H/W Features Item Specifications Band GSM DUAL Band(900/1800) Type Bar type Dimension 98 * 45 * 12.9mm Weight 60g Battery 750mAh Li-ion Talk Time Over 2hours @EGSM,TX Level : 5 Stand-by Time Over 200 hours @Paging period : 5 RTC Under 4 hours when removed battery. Antenna - LG KG270 | Service Manual - Page 7
AMR FM Radio Integrated handsfree speaker Specification O OSE O X X X X X O X X X O TBD X MMS Pictures (Still Image & X Moving Image) X MP3 (Music Contents) X Java Contents O Wallpaper O Ringtone X external memory (microSD) X O FR, HR, EFR, AMR-NB O O O Speaker phone mode Etc. Under 300KB 3 bitmap - LG KG270 | Service Manual - Page 8
Item Specification Etc. Display RSSI O 6 level Battery Level O 5 level RTC O Multi?Language O Basic:English Max. 4 language of Latin 2 or 3 language of etc. Quick Access Mode X PLMN/Service Indicator O Dimming Clock X Dual Clock X Local Time / Selected Area Time Normal Features - LG KG270 | Service Manual - Page 9
Item Specification Etc. Network DTMF Audio Cell Broadcast Phone Book Automatic Network Selection Manual Network Selection Network Service Status DTMF Signaling DTMF Enable & Disable Key Tone Volume Ring Tone Volume Ring Tone Pattern Ring Type Silent Earpiece Volume Mute Read Cell Broadcast Cell - LG KG270 | Service Manual - Page 10
Help Menu X Specification Etc. All Incoming Calls, No Reply On Busy, Not reachable All Outgoing Calls, International Calls, Calls except to Home Country incoming Calls, All incoming Calls when roaming up to 3 calls 3 V only Service Provider / Network Lock Class 1, 2, 3 Not Support EMS Normal - LG KG270 | Service Manual - Page 11
Specification Etc. Sound contents Miscellaneous Function Text Input Scheduler World Time Unit converter Ringtones O Calculator Calculation O PC Sync Phone Book Sync X Message Sync X Multimedia function Automatic setting as country code in SIM Currency, Surface, Length, Weight, - LG KG270 | Service Manual - Page 12
Embedded microSD Card X microSD Adapter X Stereo earmic O EarMic Type Provides optionally only for supporting FM radio function. earmic w/music remote controller X Neck strap X LCD Cleaner X Holster X Data cable O RS232 cable Option CD X Holster charger X Standard battery Back - LG KG270 | Service Manual - Page 13
3. TECHNICAL BRIEF 3. TECHNICAL BRIEF 3.1 Digital Main Processor(PMB7880) Figure. 3-1 PMB7880 FUNCTIONAL BLOCK DIAGRAM - 14 - - LG KG270 | Service Manual - Page 14
Mobile Phone applications. The E-GOLDvoice is designed as a single chip solution that integrates the digital, mixed-signal, RF functionality and a direct-to-battery TX interface • Digitally controlled crystal oscillator generating system clocks. The E-GOLDvoice supports a direct battery connection - LG KG270 | Service Manual - Page 15
of external peripherals - SIM Interface - Keypad Interface (6x4 or 5x5 keys) - EBU for external RAM/FLASH connection - Asynchronous serial interface - JTAG Interface - Black & white and color displays are supported - PWM source to drive vibrator - Keypad and display backlight supported. ] Receiver - LG KG270 | Service Manual - Page 16
driver • 32-Ohm headset driver • 4 measurement interfaces (PA temperature, battery voltage, battery temperature,and ambient temperature) • Differential microphone input • System start up circuitry • Charger circuitry for NiCd, NiMh and LiIon cells • Integrated regulators for direct connection to - LG KG270 | Service Manual - Page 17
for mobile stations operating in the GSM850/900/1800/1900 bands. In the receiver path the antenna input signal signal (SAIC support available) 2. Viterbi channel decoding supported by an hardware accelerator. The recovered digital speech data is fed into the speech decoder. The E-GOLDvoice supports - LG KG270 | Service Manual - Page 18
3. TECHNICAL BRIEF 3.1.4 PMU Details The E-GOLDvoice includes battery charger support (various sensor connections for temperature, battery technology, voltage, etc.) and a ringer buffer. E-GOLDvoice avoids the need for an external power management component because its internal power management unit - LG KG270 | Service Manual - Page 19
needed in a low feature mobile phone. A charger control circuit charges NiCd, NiMH and LiIon batteries. The charger control supports hardware controlled pre-charging and software controlled charging. It offers a wide charger voltage range, making halfwave/full-wave charging with cheap transformers - LG KG270 | Service Manual - Page 20
TECHNICAL BRIEF The security features use the following mechanism: • Boot ROM flow: - Controls the boot transition to external flash - Controls the flash update • Flash tied to offset is compensated in the digital signal processing domain. This processing includes frequency and timing compensation - LG KG270 | Service Manual - Page 21
mm), compact form factor for quad-band cellular handsets comprising GSM850/900, DCS1800, and PCS1900 operation. The PAM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation. The module consists of separate GSM PA and DCS1800/PCS1900 PA blocks, impedance-matching circuitry - LG KG270 | Service Manual - Page 22
circuitry to select GSM (logic 0) or DCS/PCS (logic 1) as determined from the Band Select (BS) signal. In Figure 1 below, the BS pin selects the PA output (DCS/PCS_OUT orGSM_OUT) and the Analog Power Control . The ENABLE input allows initial turn-on of PAM circuitry to minimize battery drain. - 23 - - LG KG270 | Service Manual - Page 23
static and dynamic frequency variations have to be compensated, otherwise the mobile would be in danger of losing connection to the network. compensation (which is continuously updated) required based on the measured frequency error. Then the required AFC compensation is sent to the LUXO (Lineari - LG KG270 | Service Manual - Page 24
low power consumption the RTC can be supplied from a small backup battery. This allows the generation of external interrupts, even when the main the 32k clock is provided to the RTC. The RTC consists of an PMB7880 specific RTC shell, containing the RTC macro, as well as the 32 kHz oscillator, - LG KG270 | Service Manual - Page 25
13Y902 (ENQY0013801) MTPD R206 R208 MLED1 C221 1u LCD_ID C211 27p C212 27p 47 CS3 47 SSC0_MTSR C213 C214 NA NA Figure 3-5-1. LCD Interface VBAT CHARGE PUMP MLED W_LED_DRV R202 C202 100K 27p U200 5 IN AAT3157ITP-T1 10 C1+ 8 CP 11 EN_SET 4 GND C1- 9 7 C2+ 6 C2- D1 1 2 D2 D3 3 NC - LG KG270 | Service Manual - Page 26
signal transfer serial data to driver IC. This signal transfer serial clock to driver IC. This signal makes driver IC to HW default status. This signal provide power to white LEDs. This signal be feed back from white LEDs. This signal suited for small, battery-powered applications. AnalogicTech's - LG KG270 | Service Manual - Page 27
SIM card is inserted or not, but it doesn't check during deep sleep mode. In order to communicate with SIM card, 3 signals SIM_DATA, SIM_CLK, SIM_RST. Signals SIM_RST SIM_CLK SIM_DATA Description This signal makes SIM card to HW default status. This signal is transferred to SIM card. This signal - LG KG270 | Service Manual - Page 28
together with the XBIU and the Shared Memory Register, using a single Bus Interface. The keypad supports two scan modes: • By default, the keypad is a 4x6 scan matrix (4 input and 6 output pins). • To set the keypad to a 5x5 scan matrix (5 input and 5 output pins) The scan mode should be determined - LG KG270 | Service Manual - Page 29
IC Interface The AAT3681A is a high performance battery charger designed to charge single Cell lithiumion/polymer batteries with up to 500mA of current from an external power source. It is a stand-alone charging solution, with just one external component required For complete functionality. The - LG KG270 | Service Manual - Page 30
PART_NO SFSB0001301 L403 18nH C420 3p C421 3p C422 3p L404 5.1nH GSM_RXN GSM_RXP DCS_RXN DCS_RXP Figure 3-9-2. SAW Filter interface E-GOLDvoice features a fully integrated constant-gain direct conversion receiver, i.e. there is no interstage filter needed and the baseband level at the analogue - LG KG270 | Service Manual - Page 31
. The modulation is transferred between baseband- and RF-part of the PMB7880 via a digital interface signal into the digital modulator. The following Gaussian filter shapes the digital data stream for the GMSK modulation. Additionally a pre-distortion filter compensates the attenuation of the PLL - LG KG270 | Service Manual - Page 32
The audio front-end of E-GOLDvoice offers the digital and analog circuit blocks for both receive and transmit audio operation and ringing. It features a high-quality, digital-to-analog path with amplifying stages for connecting acoustic transducers to the E-GOLDvoice. In the transmit direction the - LG KG270 | Service Manual - Page 33
digital filters for interpolation and decimation of the audio signals being received and transmitted. The data path for the receive direction can be set up DSP firmware. Two sampling rates, 8kHz and 16kHz, are supported. The analog section contains all the necessary analog functional blocks - LG KG270 | Service Manual - Page 34
3. TECHNICAL BRIEF RECEIVER REC_P REC_N C100 39p L100 L101 22nH 22nH C102 39p C103 39p CN100 1 2 11*07*3T receiver (SURY0013001) Figure 3-10-2 Main Receiver interface SPEAKER AMPLIFIER C116 NA R103 NA SPK_N C117 0.1u R104 20K SPK_P C118 0.1u R105 20K RADIO_SPK_L C119 0.1u R106 - LG KG270 | Service Manual - Page 35
3. TECHNICAL BRIEF VINNORP VINNORN MAIN_MIC VMIC R300 1K R301 2.2K C303 39p C304 10u C307 0.1u R304 C306 100ohm 0.1u R307 100ohm C309 0.1u R309 2.2K 39p 39p C308 39p OB4-15L42-C33L 2 1 MIC300 C314 C313 Figure 3-10-4 Main Microphone interface VMIC R316 1.5K AUXIN C317 0.1u - LG KG270 | Service Manual - Page 36
,K,X5R) LD200 KEY_BACKLIGHT R222 1K R223 10K 2SC5585 Q200 (10V,K,X5R) Figure 3-11 Key LED interface This handset has 6 LEDs that illuminates blue color. Control signal is controlled by EGold-voice with PWM and handset has 3 methods, ON, OFF and Dimming. - 37 - - LG KG270 | Service Manual - Page 37
) C302 27p CN300 1 2 C305 27p R305 10 (1608) VIBRATOR R306 1K Q300 2SC5585 R308 100K Figure 3-12 Vibrator interface This handset has vibrator operation. Control signal is controlled by EGold-voice with PWM. - 38 - - LG KG270 | Service Manual - Page 38
. NOR Flash memory is supported. (The NAND Flash memory is not supported). The page mode can be supported for flash memories. Up to 8MBytes of external RAM and/or ROM can be connected to the MCU via its external bus interface. Up to 3 external CS signals can be generated to save external glue logic - LG KG270 | Service Manual - Page 39
card supply is provided by the on-chip voltage regulators. Table 144 is an overview of the internal generated supply voltages. The integrated power management also provides the control state machine for system start up, including start up with discharged batteries, trickle charging and system reset - LG KG270 | Service Manual - Page 40
controller RAM is switched to a power saving mode. Start-up and Reset Control State Machine Features • Power up upon battery insertion, push button, alarm, charger connection. • Detection of battery exchange or re-insertion. • Complete start-up sequence management. • System turn-on, system turn-off - LG KG270 | Service Manual - Page 41
RADIO_AMP_SHDN (FOR FM RADIO) FM_INT RADIO_AMP_SHDN 3. TECHNICAL BRIEF 3.15 FM Radio Interface - 42 - RADIO FM_ANT R328 0 C334 NA 2V8_VIO R325 NA 2V8_RADIO TP301 FM_INT GPIO3 16 18 17 20 19 PGND 21 C331 100p FM_RST FM_RST 1 2 NC1 3 FMIP U302 GND3 15 14 LOUT 13 4 5 RFGND - LG KG270 | Service Manual - Page 42
RX) section integrates a low noise amplifier (LNA) supporting data will be requested. Data transfer ceases with the STOP command. After every STOP command, the internal address counter is reset. 3.15.2 Headphone Amplifier The MAX4411 fixed-gain, stereo headphone driver features charge pump, and comprehensive - LG KG270 | Service Manual - Page 43
4. TROUBLE SHOOTING 4. TROUBLE SHOOTING 4.1 RF Trouble SW400 U400 FL400 FL401 X101 U102 REFERENCE U400 X101 FL400 SW400 FL401 PART Description PAM (Power Amp. Module) DCXO (26MHz) ASM (Antenna Switch Module) Mobile Switch RX SAW Filter - 44 - - LG KG270 | Service Manual - Page 44
SHOOTING RF Trouble TEST POINT Antenna Matching component Antenna.Contact Point SW400 CIRCUIT DIAGRAM TP400 TP401 TP402 TP403 TP404 TP405 R400 NA R401 0 C400 1p L400 2.2nH Antenna Matching component L401 22nH R403 0 ANT SW400 RF500 Mobile SW G2 G1 RF Coupling Capacitor C410 22p - LG KG270 | Service Manual - Page 45
4. TROUBLE SHOOTING CHECKING FLOW START Check Antenna PAD& Intenna Contact NG Change Antenna Check Matching component NG Resolder component OK Check Mobile SW OK Download And Calibration NG NG Change SW400 Change PCB - 46 - - LG KG270 | Service Manual - Page 46
4. TROUBLE SHOOTING RX Trouble TEST POINT SW400 U400 FL400 FL401 X101 U102 CHECKING FLOW START Setup Test Equipment Cell Power :-74d Bm GSM850 CH190 PCS CH660 Check point. DCXO(X101) Check point mobile SW & ASM & SAW Filter(SW400,F L400,FL401) Re-Download S/W & CAL - 47 - - LG KG270 | Service Manual - Page 47
4. TROUBLE SHOOTING RX Trouble (1) Checking VCTCXO Circuit TEST POINT SW400 U400 FL400 FL401 CHECKING FLOW Is the waveform of Pin3 similar to DCXO(X101) Waveform? Yes DCXO Circuit is - LG KG270 | Service Manual - Page 48
4. TROUBLE SHOOTING RX Trouble TEST POINT SW400 Pin 4 U400 FL400 Pin 6 FL401 U102 CHECKING FLOW Check Pin 1, 2 of SW400 with RF Cable Signal is OK ? Yes Check Pin 4,6 of FL400 ? Yes Check Pin 6,7 and 8,9 of FL401 ? Yes N o Replace Mobile SW (SW400) N o Replace ASM (FL400) N o - LG KG270 | Service Manual - Page 49
4. TROUBLE SHOOTING 4.2 TX Trouble TEST POINT SW400 U400 X101 FL400 FL401 U102 CHECKING FLOW Setup Test Equipment Cell Power : - 74dBm GSM850 CH190 PCS CH661 Check point DCXO(X101) Check point ULC2(U102)Outp ut Signal Check point PAM(U400) Control Signal Check ASM & Mobile S/W & SAW (FL400,SW400 - LG KG270 | Service Manual - Page 50
TX Trouble TEST POINT 4. TROUBLE SHOOTING CIRCUIT TX_RAMP R402 1K C401 39p U400 HB RF Input Waveform Paon & BS ASM Vapc CHECKING FLOW Check Control Signals Signals are Normal ? N o Check ULC2(U102) Yes PAM Control Signal is OK. See next page to check ASM & Mobile SW Circuit. - 51 - - LG KG270 | Service Manual - Page 51
VC2 C417 C418 27p 27p C410 22p FL400 LMSP2PAA-575TEMP 9 1 IN GSM1800_1900TX GSM1800_1900RX 6 3 7 VC_GSM850_900TX VC_GSM1800_1900TX 5 8 GND1 GSM850_900TX 2 4 10 GND2 GND3 GSM850_900RX Mode VC1 VC2 GSM900 TX H(2.7V) L DCS1800 TX L H(2.7V) GSM800 RX L L DCS1800 RX L L - 52 - - LG KG270 | Service Manual - Page 52
4. TROUBLE SHOOTING RX Trouble TEST POINT SW400 Pin 1 Pin 2 U400 Pin 3 CHECKING FLOW Check Pin 1, 2 of SW400 with RF Cable FL400 Pin 7 FL401 U102 Signal is OK ? Yes N o Replace Mobile SW (SW400) Check Pin 1,2 Yes Control No Signal is OK ? Yes Check ULC2 (U102) Pin 3,7 Signal is normal ? - LG KG270 | Service Manual - Page 53
C110 C106 26Mhz C108 V_SIM 2.85V C107 2.8V V_IO C109 V_MEM 2.8V C101 V_BUF 3.2V LDO VOLTAGE PART C101 C107 C111 TEST POINT Check Points -Battery Voltage( Need to over 3.35V) -Power-On Key detection (PWRON signal) -Outputs of LDOs from EGV 4.3 Power On Trouble 4. TROUBLE SHOOTING - LG KG270 | Service Manual - Page 54
Power On Trouble CHECKING FLOW START Check Battery Voltage > 3.35V YES Push power-on key And check the level change of PWRKEY YES Check the voltage of The LDO outputs at U102 NO Charge or Change Battery NO Check the contact of power key Or dome-switch NO Replace U102 YES THE PHONE WILL POWER - LG KG270 | Service Manual - Page 55
4. TROUBLE SHOOTING 4.4. SIM Card Trouble TEST POINT R302/C310 C331/C332 J300.PIN1 CIRCUIT DIAGRAM 2V85_VSIM 2V85_VSIM R302 4.7K 0 R303 2V85_VSIM SIM_DATA C310 22p J300 4 1 5 GND VPP VCC RST 2 6 8 I_O CLK GND2 GND1 3 7 SIM_RST SIM_CLK C311 C312 0.1u 22p - 56 - - LG KG270 | Service Manual - Page 56
4. TROUBLE SHOOTING Checking Flow START Does the SIM cards supports 3V ? NO Change the SIM Card. Our phone supports only 3V SIM card. R302/C310/ C311/C312 YES Check soldering NG status of J300 and Other component OK Resolder J300 or other component NG J300.PIN1 = 2.85V Check - LG KG270 | Service Manual - Page 57
4. TROUBLE SHOOTING 4.5. Vibrator Trouble TEST POINT R306 R308 Q300.PIN3 R305 CIRCUIT DIAGRAM VBAT VBAT 1SS302-T5L_F_H D300 (50V,J,NP0) C302 27p CN300 1 2 C305 27p R305 (1608) 10 VIBRATOR R306 1K Q300 2SC5585 R308 100K - 58 - - LG KG270 | Service Manual - Page 58
4. TROUBLE SHOOTING Checking Flow START Enter the engineering mode, and set vibrator on. R306=2.8V Check Voltage Level of NG R308=0.7V R306/R308 Change PCB OK Q300.PIN3=0V Check Voltage Level of NG R305=0V Q300.PIN3 and R305 Change Q300 OK Replace Vibrator - 59 - - LG KG270 | Service Manual - Page 59
4. TROUBLE SHOOTING 4.6. Keypad Trouble TEST POINT R215 R201 R211 R203 R214 R212 R209 R204 R213 CIRCUIT DIAGRAM KEY MATRIX END_KEY END SW200 2V0_VRTC KEY_OUT1 R201 680 C205 NA KEY_OUT2 - LG KG270 | Service Manual - Page 60
4. TROUBLE SHOOTING Checking Flow START Check Metal Doom NG Change Metal Doom OK R201/R203/R204 R209/R211/R212 R213/R214/R215 Check soldering status Of component NG Resolder component OK Change PCB - 61 - - LG KG270 | Service Manual - Page 61
SHOOTING 4.7 RTC Trouble CIRCUIT Check Points - 32.768KHz is right clock - The power of RTC is right. SWITCH_ON OSC32K N7 P6 R5 F32K B4 CLKOUT 32KIN 32KOUT X100 4 3 1 2 - LG KG270 | Service Manual - Page 62
4. TROUBLE SHOOTING CHECKING FLOW START Is the frequency about 32Khz? YES Is VRTC about 2.0V? YES RTC will work properly Replace X100 and try again. Replace BAT100 - 63 - - LG KG270 | Service Manual - Page 63
SHOOTING 4.8. Key backlight Trouble TEST POINT Q200.PIN3 R204 R203 Q200.PIN2 D203 D20 4 D205 CIRCUIT DIAGRAM VBAT KEY BACKLIGHT D200 D201 D202 1u 100ohm R221 100ohm R220 100ohm - LG KG270 | Service Manual - Page 64
4. TROUBLE SHOOTING Checking Flow START R222=2.8V Check Voltage Level Of R222 YES R222=0.7V Check Voltage Level Of R222 and Q200.PIN2 NO Change PCB - LG KG270 | Service Manual - Page 65
SHOOTING 4.9. LCD Trouble TEST POINT CN200 R207R205 R206R208 C221 CIRCUIT DIAGRAM LCD_RESET SSC0_CLK R205 R207 C208 NA MTPG 47 47 MLED C209 27p C210 27p MLED2 R210 100K - LG KG270 | Service Manual - Page 66
4. TROUBLE SHOOTING Checking Flow START Backlight is OK? YES Check Operation After LCD changes NO Change PCB OK Change LCD NG C221=2.8V Control Signal= Refer to next page Check Control Signal and Power Including soldering status NG Replace component Or change PCB OK Check soldering NG - LG KG270 | Service Manual - Page 67
4. TROUBLE SHOOTING WAVEFORM SS0_SCK LCD_CS ]SS0_MTSR pattern is out randomly when clock is fluctiatied. , clock frequency is 13MHz and LCD_RESET is High(2.8V). - 68 - - LG KG270 | Service Manual - Page 68
4.10. Microphone Trouble TEST POINT Microphone component 4. TROUBLE SHOOTING R300 MIC.P CIRCUIT DIAGRAM MAIN_MIC VMIC R300 1K VINNORP VINNORN R301 2.2K C303 39p C304 10u C307 0.1u R304 C306 100ohm 0.1u R307 100ohm C309 0.1u R309 2. - LG KG270 | Service Manual - Page 69
4. TROUBLE SHOOTING Checking Flow Make a call R300.VMIC=2.5V Check voltage level NO of R300 YES Replace PCB Check component NG Re-solder or status around MIC replace the Component OK NG Check status of MIC Re-solder or replace Microphone OK Check the voltage Level NG of MIC_P - LG KG270 | Service Manual - Page 70
4.11. Receiver Trouble TEST POINT 4. TROUBLE SHOOTING L101 C103 REC.N L100 C102 REC.P CIRCUIT DIAGRAM RECEIVER REC_P REC_N C100 39p L100 L101 22nH 22nH C102 39p C103 39p CN100 1 2 11*07*3T receiver (SURY0013001) - 71 - - LG KG270 | Service Manual - Page 71
4. TROUBLE SHOOTING Checking Flow Press any Key Check L100/L101 C102/103 Check component status NG Re-solder or replace the Component YES L100&L101 bias will Fluctiate signal above 1.2V Check L100 & L101 OK Check Receiver Re-solder or NG replace the Component NG replace Receiver OK - LG KG270 | Service Manual - Page 72
TEST POINT Check Points - Speaker spring contact - Audio amp soldering 4. TROUBLE SHOOTING L103 L104 CN101íS 1PIN C117 C118 CN101íS 2PIN C120 CN200 AMP IC R111 CIRCUIT SPEAKER AMPLIFIER C116 NA R103 NA SPK_N C117 0.1u R104 - LG KG270 | Service Manual - Page 73
4. TROUBLE SHOOTING Checking Flow Start Check the voltage level of U100 = Vbat? Yes Check the Signal, C117,C118 Yes Check the Level of U100.C3 = Low ? Yes Check the Signal, L102,L103 Yes Check the Contact Of CN101 Yes Try again or Change the Board Check No The battery Check U102 No Check No - LG KG270 | Service Manual - Page 74
SHOOTING 4.13 Headphone Trouble TEST POINT Check Points -18pin IO connector -Passive Parts slodering Status C321 C322 FB300 FB302 FB301 CN301 CIRCUIT DIAGRAM VMIC R316 1.5K AUXIN C317 0.1u - LG KG270 | Service Manual - Page 75
the audio profile of the phone change to the earphone mode? No No Check the voltage Level CN301.8 = Low? Re-solder CN301 or Change another Ear- Mic set and Try again Yes Replace U100 or Change Board Yes Mic Go to MIC Trouble section Earphone Acoustic Check the signal Level at AUX_MIC. Is it - LG KG270 | Service Manual - Page 76
SHOOTING 4.14 Charging Trouble TEST POINT Check Points -Connection of TA (check TA voltage 5.2V) -Charging Current Path component voltage drop -Battery voltage -Charging IC R124 Charger IC U101 C125 VBAT VCHARGE =5.2V C126 CN301 CIRCUIT CHARGING IC 2V8_VIO VCHARGE VBAT VCHARGE R118 - LG KG270 | Service Manual - Page 77
Is 2.8V YES Check the voltage of R124 High or Low? YES Battery is charged? NO NO LOW NO NO YES Charging is properly operating Resolder the CN300 Pin 12,13 : VCHARGE The TA is out of order Change the TA Replace the U101 Check the U102 The battery may have problems. Change the battery. - 78 - - LG KG270 | Service Manual - Page 78
4. TROUBLE SHOOTING 4.15. FM Radio Trouble TEST POINT U304.P1 U304.P4 R327 R331 R332 R338/R337/R336 U303 R329/R330 C332/C333 U302 - 79 - - LG KG270 | Service Manual - Page 79
RADIO_AMP_SHDN (FOR FM RADIO) FM_INT RADIO_AMP_SHDN 4. TROUBLE SHOOTING CIRCUIT DIAGRAM - 80 - RADIO FM_ANT R328 0 C334 NA 2V8_VIO R325 NA 2V8_RADIO TP301 FM_INT 16 GPIO2 17 21 20 19 18 C331 100p FM_RST - LG KG270 | Service Manual - Page 80
4. TROUBLE SHOOTING Checking Flow Connector Headset and Turn on Radio and tuned channel U304.PIN1 = High U304.PIN4=2.8V R336/R337/338 Check I2C signal and 32K clock R329/R330 C332/C333 R327/R331 Check LDO NO Power YES Check NG Control Signal OK Check NG Audio Output Of Transceiver OK - LG KG270 | Service Manual - Page 81
5. DOWNLOAD 5. DOWNLOAD 5.1 Download Setup Configure system like figure 5-1. Figure 9-1. Download Setup - 82 - - LG KG270 | Service Manual - Page 82
Download step[1] 5. DOWNLOAD : Start or Stop download : Selected configuration DLL file : File name donwloading File(F) → Exit(X) : End program Setting(S) → Configuration : configuration download condition DLL, SW files and etc. About(H) → MultiGSM : Provide version information First, select - LG KG270 | Service Manual - Page 83
5. DOWNLOAD 5.2.2. Download step[2] : Select a appropriated DLL file - You must select KG270_xxxxxx.DLL file. : Select configuration file You must select cmd.m0 file : Select download speed You must 460800. System supports maximum 460800bps. : Select port select start and end port be operated - 84 - - LG KG270 | Service Manual - Page 84
5.2.3. Download step[3] 5. DOWNLOAD : Select files downloaded KG270 have 4 files, *.eep, *.fls, *.dffs and *.cust. But You must not select *.eep file. - 85 - - LG KG270 | Service Manual - Page 85
next step. If configuration is finished, then push start button and then button is changed to STOP. Turn on power of multi download and connector phones. If download is started, then push start button else program will download repeatedly. - 86 - - LG KG270 | Service Manual - Page 86
5.2.5. Download step[5] 5. DOWNLOAD : This region appears donwload status. If download is finished, PASS or FAIL.message is showed. - 87 - - LG KG270 | Service Manual - Page 87
6. BLOCK DIAGRAM 6. BLOCK DIAGRAM - 88 - - LG KG270 | Service Manual - Page 88
MODEL KG278, MG160b, KG275 KG270 MG160a R196 0 R197 NA CHARGING IC) ADD02 A2 A19 ADD19 1 E4 F3 GND GND 2 ADD03 D4 A3 A18 L3 ADD18 RX RX RXD ADD04 A4 A17 ADD17 3 G4 K4 TX TX LG Electronics Inc. DRAWING NO. VER-1.1 1 2 3 4 5 6 7 8 9 LG(42)-A-5505-10:01 LG Electronics Inc - LG KG270 | Service Manual - Page 89
DIAGRAM 1 2 3 4 5 6 7 8 9 10 A A 2V0_VRTC KEY MATRIX END VBAT CHARGE PUMP END_KEY SW200 U200 5 IN AAT3157ITP-T1 10 C1+ C200 MAKER ID Voltage 1u KEY_OUT1 R201 HYUN-OK.LEE MODEL DRAWING NAME GB3_RADIO Sheet/ Sheets 2/4 AUDIO,LCD,KEY LG Electronics Inc. DRAWING NO. REV - LG KG270 | Service Manual - Page 90
11/16 2006 Sign & Name SANG-YEON.LEE MODEL 2006 2006 DRAWING NAME GB3_RADIO SPFY0144601 E Sheet/ Sheets 3/4 RADIO,MEMORY,AUDIO,I/O Iss. Notice No. Date Name LG Electronics Inc. DRAWING NO. VER-1.1 1 2 3 4 5 6 7 8 9 LG(42)-A-5505-10:01 LG Electronics Inc. - 91 - - LG KG270 | Service Manual - Page 91
DCS_RXP TP406 DEFAULT_BANDSEL D Section Designer Date 11/16 2006 Checked 2006 Approved 2006 Sign & Name KEE-OUN.PARK MODEL DRAWING NAME GB3_RADIO Sheet/Sheets 4/4 RF LG Electronics Inc. DRAWING NO. 5 6 7 VER - LG KG270 | Service Manual - Page 92
8. PCB LAYOUT - 93 - - LG KG270 | Service Manual - Page 93
8. PCB LAYOUT - 94 - - LG KG270 | Service Manual - Page 94
Mode Engineering mode is designed to allow a service man/engineer to view and test the basic functions provided by a handset. 9.2 Access Codes The key sequence for switching the engineering mode MODE 1. BB TEST 2. Model Version 3. Eng Mode 4. Call Timer 5. Factory Reset 6. MF Test - 95 - - LG KG270 | Service Manual - Page 95
9. ENGINEERING MODE BB TEST 1. Backlight 2. LCD 1. Backlight On 2. Backlight Off 3. Backlight Value 1. LCD Color 2. Contrast 3. Battery Info 1. Red 2. Green 3. Blue 4. Black 5. White 6. Auto LCD 4. Vibrator 1. Vibrator On 2. Vibrator Off 5. Audio * 6. FM Radio 1. Audio Test 2. Close * FM - LG KG270 | Service Manual - Page 96
5 color menu is Red, Green, Blue, Black and White. ➁ LCD contrast : This menu displays a contrast value and LCD maker. 9.4.1.3 Battery Info This menu displays the information of battery, as example battery voltage level and temperature. In line 2, battery voltage level is displayed with average and - LG KG270 | Service Manual - Page 97
9. ENGINEERING MODE Model Version 9.4.2 Model Version This menu displays the Model software version. Eng Mode 1. Serving Cell 2. Neighbour Cells 3. Reset Information - 98 - - LG KG270 | Service Manual - Page 98
Serving Cell RxQf : Full RX qual of Serving Cell RxQs : Sub RX qual of Serving Cell DSC : Downlink Signal Counter RLL : Radio Link Loss Counter Chtyp : Channel type of Serving Cell Chmod : Channel Mode of Serving Cell DTX : Discontinuous Transmission mode of Serving Cell MCC : Mobile Country Code of - LG KG270 | Service Manual - Page 99
be used to decide cell reselection. MCC : Mobile Country Code of Neighbour Cell MNC : Mobile Network Code of Neighbour Cell LAC : Location Area Code of Neighbour Cell CID : Cell ID of Neighbour Cell BSIC : Base Tranceiver Station Identity Code of Neighbour Cell 9.4.3.3 Reset Information This menu - LG KG270 | Service Manual - Page 100
9. ENGINEERING MODE Call Timer 9.4.4 Call Timer This menu displays the time of all calls, including the received calls. Factory Reset 9.4.5 Factory Reset This menu is to format data block in the flash memory and this procedure set up the default value in data block. - 101 - - LG KG270 | Service Manual - Page 101
9. ENGINEERING MODE MF TEST 1. All auto Test 2. Backlight 3. Audio 4. Vibrator 5. LCD 6. Key Pad * 7. Mic Speaker * 8. FM radio * function is not supported - 102 - - LG KG270 | Service Manual - Page 102
the baseband test automatically. Selecting this menu will process the test automatically, and phone displays the previous menu after completing the test. 9.4.6.1 All auto Test LCD, ', you may press any keys. If the key is working properly, name of the key is displayed on the screen. - 103 - - LG KG270 | Service Manual - Page 103
10. CALIBRATION 10. CALIBRATION 10.1 Test Equipment Setup 4.000V 0.0000A 10.2 Calibration Steps 10.2.1 Tune on the phone 10.2.2 Execute "HK_28.exe" - 104 - - LG KG270 | Service Manual - Page 104
10.2.3 Click "SETTING" Memu KG278 10. CALIBRATION 10.2.4 Setup "Ezlooks" menu such as the following fugure - 105 - - LG KG270 | Service Manual - Page 105
operation such as the following figure KG278 Operation Mode 1. By-Pass: not control by GPIB 2. Normal : control by GPIB Setup UART Port PWR : Power Supply CELL :Call-Test Equipment - 106 - - LG KG270 | Service Manual - Page 106
10.2.7 Select "MODEL" 10.2.8 Click "START" for RF calibration KG278 10. CALIBRATION 10.2.9 RF Calibration finish - 107 - - LG KG270 | Service Manual - Page 107
10. CALIBRATION 10.2.10 Calibration data will be saved to the following folder - 108 - - LG KG270 | Service Manual - Page 108
11. STAND ALONE TEST 11. STAND ALONE TEST 11.1 Test Program Setting 11.1.1 Set COM Port 11.1.2 Check PC Baud rate(115200) 11.1.3 Confirm EEPROM & Delta file prefix name 11.1.4 Click "V24AT#ON" and then "Update Info" for communicating Phone and Test Program Not Connected - 109 - - LG KG270 | Service Manual - Page 109
11. STAND ALONE TEST Connected 11.1.5 For the purpose of the Standalone Test, Change the Phone to "ptest mode" and then Click the "Reset" bar. 11.1.6 Select "Non signaling" in the Quick Bar menu. Then Standalone Test setup is finished. Change "ptest mode" - 110 - - LG KG270 | Service Manual - Page 110
.2 Tx Test 11.2.1 Click "Non signaling mode" bar and then confirm "OK" test in the command line 11.2.2 Put the number of TX Channel in the ARFCN 11.2.3 Select "TX" in the RF mode menu and "PCL" in the PA Level menu 11.2.4 Finally, Click "Write All" bar and try the efficiency test of Phone - LG KG270 | Service Manual - Page 111
11. STAND ALONE TEST 11.3 RX Test 11.3.1 Put the number of RX Channel in the ARFCN 11.3.2 Select "RX" in the RF mode menu 11.3.3 Finally, Click "Write All" bar and try the efficiency test of Phone - 112 - - LG KG270 | Service Manual - Page 112
12. EXPLODED VIEW & REPLACEMENT PART LIST 12.1 EXPLODED VIEW 22 21 7 14 12 13 10 1 9 4 2 20 15 18 17 19 11 16 3 8 5 23 6 - 113 - - LG KG270 | Service Manual - Page 113
- 114 - - LG KG270 | Service Manual - Page 114
AAAY00 ADDITION 2 APEY00 PHONE 3 ACGK00 COVER ASSY,FRONT MOBILE SWITCH 3 MLAK00 LABEL,MODEL 5 ADCA00 DOME ASSY,METAL 5 MLAZ00 LABEL 6 SC100 CAN,SHIELD Part Number Specification Black Black Black Black Black Without Color Without Color Without Color Without Color Black Black Black Black - LG KG270 | Service Manual - Page 115
INSERT 5 SUMY00 MICROPHONE 5 SVLM00 LCD MODULE 4 SAFF00 PCB ASSY,MAIN,SMT 5 SAFC PCB ASSY,MAIN,SMT BOTTOM 6 BAT100 BATTERY,CELL ,CHIP 6 C119 CAP,CERAMIC,CHIP 6 C120 CAP,CERAMIC,CHIP Part Number Specification Color Remark SJMY0007903 3 V,0.85 A,4*8 ,Height 5.8T Cylinder ,; ,3V - LG KG270 | Service Manual - Page 116
6 C306 CAP,CERAMIC,CHIP 6 C307 CAP,CERAMIC,CHIP 6 C308 CAP,CERAMIC,CHIP 6 C309 CAP,CERAMIC,CHIP 6 C310 CAP,CERAMIC,CHIP Part Number Specification ECCH0002004 0.22 uF,10V ,K ,B ,TC ,1005 ,R/TP ECCH0000182 0.1 uF,10V ,K ,X5R ,HD ,1005 ,R/TP ECCH0000182 0.1 uF,10V ,K ,X5R ,HD ,1005 ,R/TP - LG KG270 | Service Manual - Page 117
CAP,CHIP,MAKER 6 C342 CAP,CERAMIC,CHIP 6 C400 CAP,CHIP,MAKER 6 C401 CAP,CERAMIC,CHIP 6 C402 CAP,CERAMIC,CHIP 6 C403 CAP,CHIP,MAKER Part Number Specification ECCH0000182 0.1 uF,10V ,K ,X5R ,HD ,1005 ,R/TP ECCH0000115 22 pF,50V,J,NP0,TC,1005,R/TP ECCH0000120 39 pF,50V,J,NP0,TC,1005,R/TP - LG KG270 | Service Manual - Page 118
,CHIP 6 L404 INDUCTOR,CHIP 6 Q200 TR,BJT,NPN Part Number Specification Color ECCH0000155 10 nF,16V,K,X7R,HD,1005,R/TP ECZH0000830 33 pF, ,12 dB,2.0*1.6*0.68 ,SMD ,925M~960M,1805M~1880M,10p,B,150_82,150_15,EGSM +DCS Rx ,; ,942.5, 1842.5 ,2.0*1.6*0.68 ,SMD ,R/TP ENSY0018101 6 PIN,ETC , ,2.54 - LG KG270 | Service Manual - Page 119
,MAKER 6 R302 RES,CHIP,MAKER 6 R303 RES,CHIP,MAKER 6 R304 RES,CHIP 6 R305 RES,CHIP,MAKER 6 R306 RES,CHIP,MAKER Part Number Specification EQBN0007101 EMT3 ,0.15 W,R/TP ,LOW FREQUENCY ERHZ0000506 6800 ohm,1/16W ,J ,1005 ,R/TP ERHZ0000244 22 Kohm,1/16W ,F ,1005 ,R/TP ERHY0000278 82K ohm - LG KG270 | Service Manual - Page 120
6 R341 RES,CHIP,MAKER 6 R343 RES,CHIP,MAKER 6 R344 RES,CHIP,MAKER 6 R345 RES,CHIP,MAKER 6 R401 RES,CHIP,MAKER Part Number Specification ERHY0003301 100 ohm,1/16W ,J ,1005 ,R/TP ERHZ0000406 100 Kohm,1/16W ,J ,1005 ,R/TP ERHZ0000443 2200 ohm,1/16W ,J ,1005 ,R/TP ERHZ0000401 0 ohm,1/16W - LG KG270 | Service Manual - Page 121
SW400 CONN,RF SWITCH 6 U100 IC Part Number Specification ERHZ0000404 1 Kohm,1/16W ,J ,1005 ,R/TP IC EUSY0328601 DFN ,10 PIN,R/TP ,Li-ion charger IC, 1A, 10Pin, 3x3, DFN 6 U200 IC EUSY0238702 TSOPJW-12 ,12 PIN,R/TP ,3PORT Charge Pump(AAT2154 Low cost version) 6 U301 IC EUSY0328001 BGA - LG KG270 | Service Manual - Page 122
R219 RES,CHIP 6 R220 RES,CHIP 6 R221 RES,CHIP 6 SPFY00 PCB,MAIN Part Number Specification ERHZ0000505 680 ohm,1/16W ,J ,1005 ,R/TP ERHZ0000505 680 ohm,1/16W ,J ,1005 ,R/TP ERHZ0000505 ,1/16W ,J ,1005 ,R/TP SPFY0144601 FR-4 ,.0.8mm,BUILD-UP 4 ,KG270/KG278 Main PCB Color Remark - 123 - - LG KG270 | Service Manual - Page 123
by SBOM standard on GCSC Level 3 Location No. Description MCJA00 COVER,BATTERY Part Number Specification MCJA0040301 MOLD, PC LUPOY SC-1004A, , , , , 3 SBPL00 BATTERY PACK,LI-ION SBPL0089503 3.7 V,750 mAh,1 CELL,PRISMATIC ,WLT, BATT, Europe Label, Pb-Free ,; ,3.7 ,750 ,0.2C ,PRISMATIC - LG KG270 | Service Manual - Page 124
Note - LG KG270 | Service Manual - Page 125
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Date: April, 2007 / Issue 1.0
Service Manual
Model : KG270/MG160
Service Manual
KG270/MG160