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LG M1994A, Service Manual

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LG M1994A Service Manual Download Page 26

Copyright              LG Electronics. Inc. All right reserved. 
Only for training and service purposes

LGE Internal Use Only

- 26 -

EXPLODED VIEW

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Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts

are identified by      in the Schematic Diagram and EXPLODED VIEW. 

It is essential that these special safety parts should be replaced with the same components as recommended

in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards. 

Do not modify the original design without permission of manufacturer.

IMPORTANT SAFETY NOTICE

Summary of Contents for M1994A

Page 1: ...FORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LN73A MODEL M1994A M1994A PTJ North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only ...

Page 2: ...or training and service purposes LGE Internal Use Only 2 CONTENTS CONTENTS 2 PRECAUTIONS 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 14 TROUBLE SHOOTING 17 BLOCK DIAGRAM 23 DESCRIPION OF BLOCK DIAGRAM 24 RIPS BOARD BLOCK DIAGRAM 25 EXPLODED VIEW 26 SVC SHEET ...

Page 3: ...heck Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna terminals phone jacks etc If the exposed metallic part has a return path to...

Page 4: ...n your body by touching a known earth ground Alternatively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge b...

Page 5: ...e solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replaced...

Page 6: ...formance of each parts are followed each drawing and specification by part number in accordance with BOM 2 5 The receiver must be operated for about 20 minutes prior to the adjustment 3 Test method 3 1 Performance LGE test method followed 3 2 Demanded other specification 3 3 Safety CE IEC specification EMC CE IEC No Item Specification Unit Remark 1 Type TFT Color LCD Module 2 Active Display area 4...

Page 7: ...W The others condition is to be default On Off Power supply 220V 60Hz 110V 50Hz Power S W Off Off mode Off Off 1W 7 MTBF 50 000 HRS with 90 Confidence level Lamp Life 50 000 Hours Min 8 Using Altitude 5 000 m for Reliability 3 000m for FOS 9 Operating Environment Temp 10 C 35 C Humidity 20 80 10 Storage Environment Temp 10 C 60 C non condensing Humidity 5 90 non condensing No Item Specification Re...

Page 8: ...in 20 000 1 4 CIE Color Coordinates White Wx 0 313 Wy 0 329 In RGB PC input RED Rx Typ 0 641 Typ Ry 0 03 0 335 0 03 APC Clear Green Gx 0 298 ACC 6500K Gy 0 611 White Blue Bx 0 147 100 IRE By 0 070 Optical Test Condition Surrounding Brightness Level dark Surrounding Temperature 25 5 C warm up Time 30 Min Input Siganl RGB PC AV Component TV Contrast Brightness Outgoing condition 6 2 Chroma No Item M...

Page 9: ...Hz M1994A Max 1680 1050 60Hz M2294A 7 RGB Input 1EA RGB DTV 480p 576p 720p 1080i DVI PC Max 1440 900 60Hz M1994A Max 1680 1050 60Hz M2294A 8 DVI Input 1EA DVI DTV 480p 576p 720p 1080i 9 HDM I Input 1EA HMDI DTV 480p 576p 720p 1080i 10 Audio Input 3 EA CVBS PCAudio Component L R Input The spec range of Color coordinates is same with the one of module because this model does not adjust white balance...

Page 10: ... Only for training and service purposes LGE Internal Use Only C 2008 9 Component Video Input Y PB PR 8 General Specification No Item Specification Remark ENERGE SYNC V H VIDEO LED COLOR POWER CONSUMPTION 55W Max On mode On On Active Blue 50W Typ Off On Power S W on Sleep mode On Off Off Amber 1W 1 Power S W Off Off mode Off Off 1W 2 D SUB Pin configuration 1 RED 3 Blue 5 S T GND 7 Green GND 9 N C ...

Page 11: ...p 7 1920 1080 33 72 59 94 74 176 1080i 8 1920 1080 33 75 60 00 74 250 1080i 9 1920 1080 28 125 50 00 74 250 1080i 10 RGB 10 1 Input PC No Resolution H freq kHz V freq Hz Pixel clock MHz Remark 1 720 400 31 468 70 08 28 321 2 640 480 31 469 59 94 25 175 3 640 480 37 5 75 31 5 4 800 600 37 879 60 317 40 0 5 800 600 46 875 75 0 49 5 6 1024 768 48 363 60 0 65 0 7 1024 768 60 123 75 029 78 75 8 1152 86...

Page 12: ...720p 6 1280 720 45 00 60 00 74 250 720p 7 1920 1080 33 72 59 94 74 176 1080i 8 1920 1080 33 75 60 00 74 250 1080i 9 1920 1080 28 125 50 00 74 250 1080i 11 DVI 11 1 Input PC No Resolution H freq kHz V freq Hz Pixel clock MHz Remark 1 720 400 31 468 70 08 28 321 2 640 480 31 469 59 94 25 175 3 640 480 37 5 75 31 5 4 800 600 37 879 60 317 40 0 5 800 600 46 875 75 0 49 5 6 1024 768 48 363 60 0 65 0 7 ...

Page 13: ...000 480p 2 720 480 31 50 60 00 27 027 480p 3 720 576 31 25 50 00 27 000 576p 4 1280 720 37 5 50 00 74 250 720p 5 1280 720 44 96 59 94 74 176 720p 6 1280 720 45 00 60 00 74 250 720p 7 1920 1080 33 72 59 94 74 176 1080i 8 1920 1080 33 75 60 00 74 250 1080i 9 1920 1080 28 125 50 00 74 250 1080i 1 All data are HEXA 2 All data are HEXA 3 Adjustable Data Serial No week year ex when year 2008 input 12 CH...

Page 14: ...K message If display Error Check connect computer jig and set 3 Click Connect tab If display Can t Check connect computer jig and set 4 Click Read tab and then load download file XXXX bin by clicking Read 5 Click Auto tab and set as below 6 Click Run 7 After downloading check OK message 3 1 ADC Process If a scaler IC changed for PCB repairing it is need to do ADC process at all times 3 1 1 PC inpu...

Page 15: ...rm whether luminance over 200cd m2 Set ACC 9300k Confirm whether x 0 283 0 03 y 0 298 0 03 or not Check sRGB Set Input to RGB Input signal 1024 x 768 60Hz Full white 255 255 gray level 100 IRE Model 60 Pattern 4 at MSPG925L Set ACC sRGB Confirm whether x 0 313 0 03 y 0 329 0 03 or not Confirm whether luminance 180 50 cd m2 4 3 Confirm color coordinate of AV Set Input to AV Input signal CVBS NTSC 6...

Page 16: ...ically turn off Must not AC power OFF during blinking 4 10 internal pressure Confirm whether is normal or not when between power board s ac block and GND is impacted on 1 5kV dc or 2 2kV dc for one second 5 EEPROM DATA 5 1 EEPROM DATA READ 5 2 1 Signal Table 5 2 E2PROM Data Write 5 2 1 Signal Table LEN 84h Byte CMD 8Eh ADH E2PROM Slave Address A0 A2 A4 A8 Not 00h Reserved by Buffer to E2PROM ADL E...

Page 17: ...ck Output of IC207 11V Check Output of IC206 3 3V IC208 1 8V Pass Pass 5V 15V 1 NO POWER LED INDICATOR OFF A Process Fail Fail Change LED Assy Check LED Assy Pass Re soldering of Change defect part of IC301 Q205 Check short of IC301 Q205 Pass Change IC201 IC203 Fail Re soldering of Change defect part of IC204 Check short of IC204 Pass Change IC207 Fail Fail Fail Re soldering of Change defect part ...

Page 18: ...S Change Panel Link Cable or Module Change Module Check LED status On Display Unit Check Panel Link Cable or Module Check the LVDS Output of IC301 Pass Pass Pass 2 No Raster B Process Fail Fail Change Inverter Connector or Inveter Chage R305 Check Inverter Connector or inverter Check Output of R305 Pass Pass Check Input source Cable and Jack ...

Page 19: ...ail Check input source cable and jack Check the JK103 Re soldering or Change the defect part Re soldering or Change the defect part Check the X300 Pass Check the input output of R151 R152 Check the input output of R310 R312 R315 Check the input output of IC301 Pass Pass 3 No Raster on RGB Signal Repeat A B process Pass X300 ...

Page 20: ...Raster Component Signal Fail Fail Fail Check input source cable and jack Check the JK105 Re soldering or Change the defect part Re soldering or Change the defect part Check the X300 Pass Check the input output of R288 Check the input output of R319 Check the input output of IC301 Pass Pass Repeat A B process Pass X300 ...

Page 21: ... the input output of R120 R121 Pass Repeat A B process Pass Check input source cable and jack 6 No Raster on Video CVBS S Video Signal Fail Change L102 L103 L104 Check the input output of L102 L103 L104 Repeat A B process Pass Check input source cable and jack Fail Check short of IC301 Q205 Pass Check Ourput of IC206 IC208 Pass Pass Fail Re soldering or change the defect part Check the X300 X300 X...

Page 22: ...7 NO SOUND Fail Fail Fail Check the Speaker wire Re soldering or change the defect part Check the X300 Re soldering or Change the defect part Change Speker Pass Check the input output of IC301 Check the input output of IC204 Check the Speaker Pass Pass Check the input Source Pass Fail Check the Source input X300 ...

Page 23: ...R G B H V D Sub LCD Module Audio Amp YDA138 Audio Amp YDA138 TMDS Signal DVI D Scaler Video Decorder LGE 9789AD LF Y Pb Pr TMD5351PAG TMDS351PAG EEPROM EEPROM COMP Y C CVBS COMP Audio L R CVBS Audio L R PC Audio L R INPUT MENU ENTER VOL DDR M13S128168A 5TG Data FSD 0 31 FSA 0 11 4Mb Serial Flash Memory Mx25L2005A Data OCMD 0 7 OCMA 0 19 EEPROM System 64K L R SP L SP R IR PROM O I EEPROM HDMI ...

Page 24: ...ideo Component RGB DVI HDMI This Block Selects input Video signals like DVBS Y C and output RGB signal On decoding We can control signal like Contrast Brightness Sharpness Color tint signals including Adaptive Comb Filter 2 Audio Signal This Block analyzes audio input signals through A V jack and PC audio and Tuner IF The analyzed signals transmitted to audio amplifier YDA138 On decoding We can co...

Page 25: ...transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor 3 Energy Transfer This part function is for transfer the primary energy to secondary through a power transformer 4 Output rectifier and filter This part function is to make a pulse width modulation control and to provide the driver signal to power switch to adjust the duty cycle during different AC input ...

Page 26: ...arts in this chassis have special safety related characteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOT...

Page 27: ...DDCD_DA 15 DDCD_CK 16 HSYNC1 17 VSYNC1 18 RMID 19 VCLAMP 20 REFP 21 REFM 22 BIN1P 23 BIN1M 24 SOGIN1 25 GIN1P 26 GIN1M 27 RIN1P 28 RIN1M 29 BIN0M 30 BIN0P 31 GIN0M 32 GIN0P 33 SOGIN0 34 RIN0M 35 RIN0P 36 AVDD_ADC 37 GND_3 38 HSYNC0 39 VSYNC0 40 VSYNC2 41 BIN2P 42 BIN2M 43 SOGIN2 44 GIN2P 45 GIN2M 46 RIN2P 47 RIN2M 48 C1 49 Y1 50 C0 51 Y0 52 VCOM2 53 CVBS3 54 CVBS2 55 CVBS1 56 VCOM1 57 CVBS0 58 VCO...

Page 28: ... 0 1uF C210 CKE 100 R231 MADR 2 1 16W 100 AR202 DQS0 MCLK 0 1uF C215 0 1uF C216 HY5DU281622FTP 5 IC200 HYHIX MEMORY 26 BA0 27 BA1 28 A10 AP 29 A0 30 A1 31 A2 32 A3 33 VDD_3 34 VSS_1 35 A4 36 A5 37 A6 38 A7 39 A8 40 A9 41 A11 42 NC_4 43 NC_5 44 CKE 45 CK 46 CK 47 UDM 48 VSS_2 49 VREF 50 NC_6 17 NC_2 3 VDDQ_1 6 VSSQ_1 16 LDQS 15 VDDQ_3 14 NC_1 13 DQ7 12 VSSQ_2 11 DQ6 10 DQ5 9 VDDQ_2 8 DQ4 7 DQ3 4 DQ...

Page 29: ...2SA1530A T112 1R Q203 E B C LED_BL 22K R206 2SC3052 Q200 E B C SI4925BDY Q205 3 S2 2 G1 4 G2 1 S1 5 D2_1 6 D2_2 7 D1_1 8 D1_2 100uF 16V C211 2SA1530A T112 1R Q201 E B C ST_5V 12505WR 03A00 P200 1 2 3 4 ST_5V 2K R225 100uF 16V C202 KEY_CTL_0 KRC102S Q202 E B C CDS3C30GTH 30V READY D217 CDS3C30GTH 30V READY D201 CDS3C30GTH 30V READY D203 CDS3C30GTH 30V READY D218 CDS3C30GTH 30V READY D216 CDS3C30GTH...

Page 30: ...C 68pF C108 D SDAA 68 R152 CDS3C30GTH 30V D119 GRN A CDS3C30GTH 30V D118 CDS3C30GTH 30V D213 BLU A KCN DS 1 0089 JK103 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ENKMC2838 T112 D113 A1 C A2 JP140 GNDG GNDB GNDR PC D sub PEJ024 06 JK101 R_SPRING E_SPRING T_SPRING SHIELD_PLATE 470K R127 CDS3C30GTH 30V D209 470K R285 22 R288 11K R294 PC_SOUND_R 560pF 50V C113 TP156 CDS3C30GTH 30V D212 75 R284 CDS3C30GTH ...

Page 31: ...S STAND_BY VOLTAGE M2294A 7mA Ramp current M1994A 6 5mA Ramp current THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X RADIATION FILRE AND ELECTRICAL SHOCK HAZARDS WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC 2 5V_DDR 3 3V_MST PWR_ONOFF_1 1 ST_5V 0 1u...

Page 32: ...30V D126 READY R143 SDA_1 SDA_1 TAFT H005F TAFT H005F NTSC TU100 1 14 AFT 13 V OUT 5 RF_AGC 12 NC_4 11 AS 2 GND_1 19 NC_7 18 NC_6 10 CLOCK 4 NC_2 1 NC_1 17 NC_5 9 DATA 8 GND_2 3 B 5V 16 SIF OUT 7 NC_3 6 TP 33V_OPTION 15 A OUT 21 SHIELD 20 NC_810K R162 SIF_OUT 100 R159 PDC012B JK106 1 2 3 4 5 6 7 8 9 10 2012 150pF C141 CDS3C30GTH 30V D125 270 R194 470 R166 SCL_1 E x t e r n a l T u n e r i n p u t ...

Page 33: ...F 16V C281 0 1uF 50V C252 2 2uF C240 15 R274 100 R265 0 1uF 50V C247 100uF 16V C282 100uF 16V C250 0 R260 MBW3216 501TF 500 ohm L217 1000pF 50V C289 L_SOUND_P 4 7uF16V C273 1000pF C291 0 1uF 50V C249 2SC3052 Q208 E B C SMAW250 04 P204 1 2 3 4 10K R256 DA 8580 L221 2S 1S 1F 2F MBW3216 501TF 500 ohm L215 0 R273 100uF 16V C267 DA 8580 L211 2S 1S 1F 2F KDS181 D222 R_SOUND_P 100K R259 0 1uF 50V C296 0 ...

Page 34: ... e o t h e r s i n p u t O f f L H D2 _DVI D0 _HDMI HDMI_RX2 MMBD301LT1G 30V D111 D2 _HDMI 0 READY R192 HDMI_RX2 ST_5V 0 01uF 50V C144 HDMI_CLK 0 R196 0 1uF C140 CK _DVI D1 _HDMI TMDS351PAG IC100 1 SDA3 2 SCL3 3 GND_1 4 B31 5 A31 6 VCC_1 7 B32 8 A32 9 GND_2 10 B33 11 A33 12 VCC_2 13 B34 14 A34 15 GND_3 16 VSADJ 17 Y4 18 Z4 19 VCC_3 20 Y3 21 Z3 22 GND_4 23 Y2 24 Z2 25 VCC_4 26 Y1 27 Z1 28 GND_5 29 ...

Page 35: ...Oct 2008 Printed in Korea P NO MFL57043803 ...

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