LG 31mu97, Service Manual

Page 1: ...eic lgservice com Asia Oceania http biz lgservice com Internal Use Only Printed in Korea P NO MFL63731189 1408 REV00 CHASSIS LM41C MODEL 31MU97 31MU97 BD CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL IPS LED MONITOR SERVICE MANUAL ...

Page 2: ...lectronics Inc All rights reserved Only for training and service purposes CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 5 TROUBLE SHOOTING GUIDE 9 BLOCK DIAGRAM 14 EXPLODED VIEW 15 SCHEMATIC CIRCUIT DIAGRAM CONTENTS ...

Page 3: ...hout damage of electrical shock Leakage Current Cold Check 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...

Page 4: ...h 1 55 0 05 M Shape Wall out Color Black Weight 0 16kg Refer to Suffix stand ard and power cord table 8 Cable USB Length 1 5m Shape A B Color Black Pin Weight 0 1kg P N EAD61273120 HDMI Length 1 8m Shape Detachable Type Color black Weight 0 11kg P N EAD00926103 DP to Mini DP Length 1 8m Shape Detachable Type Color black Weight 0 105kg P N EAD63127601 9 Power Input AC100 240V 50 60Hz 1 5A Max Outpu...

Page 5: ...se it has only digital input like DisplayPort and HDMI 3 2 EDID Process 3 2 1 EDID Download F W includes default EDID for All input ports aging on Mode If AC ON default EDID is automatically loaded to EEPROM Update serial number in EDID of HDMI1 Caution Never connect HDMI Cable when execute NVRAM Init and AC On at first for downloading HDMI EDID automatically Protocol DDC 2AB 3 2 2 Single EDID Inf...

Page 6: ...time Measure Verify Output Report End Warm 6500K Color adjustment Adjust to meet x y color coordinate as below Save Warm 6500K Color by commanding COLOR SAVE Command code Insert HDMI Jack which is connected with PC for White Balance or equivalent device Total Assembly line should check whether the color coordinate x y data refer to below table were meet or not Note x y coordinates are drifted abou...

Page 7: ...ource device 3 Check DPM operation refer to the below table 5 Signal composition for adjustment 5 1 I2C 100K BPS 5 2 COMMUNICATION START Until ACK BIT goes LOW Repeat it 5 3 Command form Command form use DDC2AB standard communication protocol a LEN DATA BYTE number to send b CMD Command language that monitor executes c VAL FOS DATA d CS Dada s CHECHSUM that transmit e DELAY 50MS f A Acknowledge 5 ...

Page 8: ...3 Use Read E2PROM s specific area as unit of 128 80h byte 84h 5 6 4 EDID Write EEPROM access by using DDC2B protocol 1 Byte write L 0x00 0x7F D data 8 byte write L 0x00 0x10 0x70 5 6 5 EDID Read DDC2B Command A0 A1 128 Byte transfer of EDID Buffer of MICOM No Adjustment contents CMD hex LEN Explanation 1 E E P R O M WRITE E8 94 16 Byte Write 2 84 n n byte Write No Adjustment contents CMD hex ADH h...

Page 9: ...l rights reserved Only for training and service purposes TROUBLE SHOOTING GUIDE 1 No Power Power Board Change Main Scaler IC100 Is Input signal timing and format in spec Does DP Jack JK100 have no problem Change DP jack Y N Y Does DP Cable have no problem Y ...

Page 10: ...ge Change IC706 and check again Y N Is 112MHz of X200 X300 frequency Is 3 3V at IC702 output voltage Change IC702 and check again N Y Change IC205 Serial flash memory Y Is 1 2V at IC707 output voltage Change IC507 and check again Y N Is 1 2V at IC701 output voltage Change IC701 and check again N Y DC DC converter block DC DC converter block Crystal Crystal 2 No Power Main Board ...

Page 11: ... Y N Check the Panel Clock signal P200 19 20 35 36pin P201 P400 P401 17 18 33 34pin Change Scaler IC100 and check again Y N Does FFC Cable have no problem Check the Output of LED Driver P1600 P1601 1 2 3 4 5 6 pin Change Module or T con Board in Module Y Check pin No T4 of Scaler IC100 you can also check this signal at R1608 R1640 Change Scaler IC100 N Check the WLED_ENABLE pin no 3 of IC1601 IC16...

Page 12: ...service purposes Change Main Scaler IC100 Is Input signal timing and format in spec Does HDMI Jack JK101 JK102 have no problem Change HDMI jack Y N Check I2C communication EDID Download EDID Data or replace EDID EEPROM N Y Does HDMI Cable have no problem Y Y IC1603 block JK101 JK102 4 No Video HDMI ...

Page 13: ... Inc All rights reserved Only for training and service purposes Change Main Scaler IC100 Is Input signal timing and format in spec Does DP Jack JK100 have no problem Change DP jack Y N Y Does DP Cable have no problem Y DP JACK block IC100 5 No Video DP ...

Page 14: ...u _Z W Oz P s kz s kz s kz s kz tkz tkz T hs ziZ XW ziG G hy ziYUW T hs Y to kw llwyvt llwyvt llwyvt ZUZ ZUZ XUW kkyYGXn kkyYGXnG T hs m shzoG_t kkyYGXn kkyYGXnG llwyvt ku XX ZUZ XU XUY ZUZ XU X pYz oVwGv XYto XU XU whulsO W QYX WP ziZUW ziZUW ziZUW ziZUW t Gkw zwp kwGzV hztX _ ziGzV ZUZ ziZUW kw owGhtw llwyvt XYto T hs XYto BLOCK DIAGRAM ...

Page 15: ...nical 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 SAF...

Page 16: ... 7K DP_SELECT DP_HPD DP1_HPD DP_AUXN DP_AUXP DP1_AUXP DP1_AUXN DP1_RX3P DP1_RX3N DP1_RX0P DP1_RX0N DP1_RX2P DP1_RX2N DP1_RX1P DP1_RX1N JK103 SPG14 TBT 0102 14 GND_4 13 GND_2 5 TBT_HD2CA_0 ML_LANE0 N 12 RESERVED ML_LANE3 N 11 LSRX ML_LANE1 N 2 HPD_GND HPD 19 RETURN 18 TBT_CA2HD_1 AUX_CH N 10 RESERVED ML_LANE3 P 4 TBT_CA2HD_0 CONFIG1 1 PWR_IN GND 17 TBT_HD2CA_1 ML_LANE2 N 9 LSTX ML_LANE1 P 8 GND_3 3...

Page 17: ...C_SCL4 RXD4 P3 PC5 DDC_SDA4 TXD4 P4 PD7 R4 RSTN V3 OSCI N1 OSCO N2 OPT1 V1 OPT0 V2 PE2 DBC PWMC M2_SPI_CE3 AC16 PE3 PWMD M2_SPI_CE4 AD17 PA2 ADC6 PWMC DIN_19 AC17 PA3 ADC7 PWMD DIN_18 AE17 PB2 ADC2 INTE2 DIN_21 AF17 PB3 ADC3 INTE3 DIN_20 AE18 P34 RXD5 DIN_16 AD18 P35 TXD6 DIN_15 AD19 PC6 AMUTE M2_SPI_CE2 AO_IN DIN_17 AC18 P30 RXD AO_OUT DIN_14 AF18 P31 TXD AO_OUTB DIN_13 AC19 PD2 M2_SPI_SO SD_I DI...

Page 18: ...SDA0 TXD0 D3 PF0 CD_SENSE1 D4 PD4 IR_PORT3 E3 PE5 CBUS2 HPD2 F3 PF5 VBUS2 F4 PB6 DDC_SCL1 RXD1 G3 PB7 DDC_SDA1 TXD1 G4 PF1 CD_SENSE2 H3 PC7 IR_PORT2 SCK_I H4 PA0 ADC4 PWMA T3 PA1 ADC5 PWMB T4 PC4 DDC_SCL4 RXD4 P3 PC5 DDC_SDA4 TXD4 P4 PD7 R4 RSTN V3 OSCI N1 OSCO N2 OPT1 V1 OPT0 V2 PE2 DBC PWMC M2_SPI_CE3 AC16 PE3 PWMD M2_SPI_CE4 AD17 PA2 ADC6 PWMC DIN_19 AC17 PA3 ADC7 PWMD DIN_18 AE17 PB2 ADC2 INTE...

Page 19: ...C26 TXDCKP AC25 TXD3N AD24 TXD3P AD23 TXD4N AD26 TXD4P AD25 DP_TX0N C25 DP_TX0P C26 DP_TX1N D25 DP_TX1P D26 DP_TX2N E25 DP_TX2P E26 DP_TX3N F25 DP_TX3P F26 DP_AUXN G25 DP_AUXP G26 DP_TXHDP G24 DPTX_OSCI H24 DPTX_OSCIO J24 EDP_TX0P H26 EDP_TX0N H25 EDP_TX1P J26 EDP_TX1N J25 EDP_TX2P K26 EDP_TX2N K25 EDP_TX3P L26 EDP_TX3N L25 EDP_AUXN M25 EDP_AUXP M26 EDP_TXHDP K24 EXT_SWING AE25 3P_OPEN AF21 3N_OPE...

Page 20: ...S3B AD2 MDQS3 AD1 MDQS2B AC2 MDQS2 AC1 MDQS1B AF11 MDQS1 AE11 MDQS0B AF10 MDQS0 AE10 MBA1 AB10 MBA0 AB9 MA12 AB5 MA11 AC14 MA10 AC5 MA9 AC4 MA8 AB14 MA7 AB6 MA6 AC13 MA5 AB8 MA4 AB13 MA3 AB7 MA2 AC12 MA1 AC6 MA0 AB12 MCSN AC11 MCKE AC7 MRASN AC10 MCASN AC9 MWEN AC8 MCLK1 AC15 MCLK1 AB15 MCLK0 AF16 MCLK0 AE16 ODT AB11 PHY_TM AB4 IC100 NT68370 E Ver MDQ31 AE2 MDQ30 AB2 MDQ29 AE3 MDQ28 AA2 MDQ27 AA1 ...

Page 21: ...M R1601 4 7K Q1600 MMBT3904 NXP E B C 5V C1600 1uF 10V R1600 10K P1600 12507WR 06L 1 2 3 4 5 6 7 GND_LED R1642 68K R1610 68K R1630 270K 1 R1662 270K P1601 12507WR 06L 1 2 3 4 5 6 7 TP1600 TP1602 C1601 33uF 100V C1603 33uF 100V GND_LED GND_LED C1613 33uF 100V GND_LED GND_LED C1615 33uF 100V C1607 1uF 50V R1629 100K GND_LED R1631 100K C1605 1uF 50V GND_LED C1611 1uF 50V R1632 100K GND_LED R1633 100K...

Page 22: ...7 VCC 8 FB C706 10uF 25V R748 47K R750 100K OPT 3 3V_SCALER_2 R751 20K OPT MULTI_ON R756 10K ZD704 5V R758 68 R757 47K C749 10uF 25V C751 0 1uF 50V C754 10uF 10V C753 0 1uF 16V 1 2V_SCALER_2 R762 3 3K 1 ZD705 5V R764 10K 1 R761 75K C755 10uF 10V R759 100K OPT R760 20K OPT IC707 MP2315GJ 3 SW 2 IN 4 GND 1 AAM 5 BST 6 EN SYNC 7 VCC 8 FB C752 0 1uF 16V MULTI_ON R765 10K R719 3 3K 1 R763 3 3K 1 L717 C...

Page 23: ...UT1B_1 37 OUT1B_2 38 VDDP1_1 39 VDDP1_2 40 OUT1A_1 41 OUT1A_2 42 VSSP1_2 43 BST1A 44 VDD_3 45 GPO06 SDO0 NTEST 46 NMUTE GPIO16 47 GPIO01 SYNC 48 GPIO00 DCLK 49 EP C834 0 22uF 50V C836 0 22uF 50V C835 0 22uF 50V C833 0 22uF 50V R813 4 7K R814 4 7K R817 10K R818 22K C819 0 01uF 25V R828 4 7K OPT Q801 MMBT3904 NXP E B C Q800 ZXMP3F30FHTA G D S R826 22K R825 4 7K 19V R827 2 7K C839 1uF 25V C840 1uF 25...

Page 24: ...51 LPWR_EN 52 GRN_LED2 53 VCC_2 54 DP_3 55 DM_3 56 VCCU_4 57 DP_4 58 DM_4 59 VDDU_4 60 VCCU_5 61 DP_1 62 DM_1 63 DP_2 64 DM_2 65 VCCO 66 VCCA5 67 VDDU_5 68 VCCU_6 69 DM_U 70 DP_U 71 VCCU_7 72 TXN_U 73 TXP_U 74 GNDA_5 75 RXN_U 76 RXP_U 77 VDDU_6 78 GND_4 79 AMB_LED1 80 OC_N2 81 OC_N3 82 OC_N4 83 EX_PWRDET 84 SMB_CLK 85 SMB_DATA 86 POR_N 87 VBUS 88 GND_5 89 EP GND JK903 UEB1112C 2AK1 4H 1 VBUS 2 D 3...

Page 25: ...VCC 8 FB R1012 33K R1015 33K 1 R1016 47K 1 R1000 47K C1012 0 1uF 16V C1000 10uF 25V R1003 68 L1003 CB2012PK501T POWER_CONTROL R1008 10K USB_5V_2 R1025 12K 1 R1027 3 9K 1 R1001 10K R1002 0 OPT R1009 10K OPT R1004 100K OPT R1005 100K OPT C1010 10uF 10V C1005 0 1uF 16V USB_POWER_EN R1019 10K R1011 100K OPT R1013 68 R1020 33K C1008 10uF 10V IC1001 MP2315GJ 3 SW 2 IN 4 GND 1 AAM 5 BST 6 EN SYNC 7 VCC 8...

Page 26: ... X RADIATION FIRE AND ELECTRICAL SHOCK HAZARDS WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC Copyright 2014 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 27: ...PCIe_3 3V_SUS PCIe_3 3V HUB_USB_DP_UP C1430 10uF 10V IC1404 TJ4220GDP ADJ TBT OPT 3 VIN3 2 EN2 4 NC4 1 NC_1 5 NC_2 6 VOUT 7 ADJ SENSE 8 GND 9 EP GND PCIE_TXN THUNDER_3 3V PCIe_1 05V USB_UP_RX C1400 10uF 10V OPT PCIe_3 3V C1420 0 1uF 16V TBT OPT SPI_DI PCIE_RXP PCIe_3 3V R1421 10K 1 TBT OPT 5V C1415 0 1uF 16V TBT OPT SSTXP0 PCIe_3 3V 5V C1409 1uF 6 3V TBT OPT R1405 12 1K 1 TBT OPT PERSTZ DM0 C1434 ...

Page 28: ... D11 DPSNK1_AUX_P H3 DPSNK1_AUX_N H1 DPSNK1_HPD U4 DPSRC_3_P A14 DPSRC_3_N B15 DPSRC_2_P A12 DPSRC_2_N B13 DPSRC_1_P A10 DPSRC_1_N B11 DPSRC_0_P A8 DPSRC_0_N B9 DPSRC_AUX_P J4 DPSRC_AUX_N J2 DPSRC_HPD_OD AC2 C1506 0 22uF 16V TBT OPT C1522 1uF 6 3V 105C TBT OPT THUNDER_3 3V R1519 1K TBT OPT C1502 0 22uF 16V TBT OPT TBT_B_R2D_1_N C1523 1uF 6 3V 105C TBT OPT R1501 10K TBT OPT C1521 0 1uF TBT OPT EE_D...

Page 29: ...C3600 74LVC1G126 TBT OPT 3 GND 2 A 4 Y 1 OE 5 VCC IC3605 TPS22981RGPR TBT OPT 1 GND_1 3 GND_3 7 VHV_2 9 ISET_S3 10 ISET_S0 11 HV_EN 12 OUT_1 13 GND_4 14 OUT_2 15 GND_5 16 ENHVU 17 S0 18 V3P3OUT 19 V3P3_1 20 V3P3_2 5 EN 8 ISET_V3P3 6 VHV_1 4 FAULTZ 2 GND_2 21 EP GND R3601 1K TBT OPT C3612 0 01uF 25V TBT OPT C3619 10uF 10V TBT OPT C3626 330pF 50V TBT OPT R3605 1K TBT OPT R3617 2 7K TBT OPT IC3604 74...

Page 30: ...C1705 1uF 6 3V TBT OPT C1702 0 01uF 25V TBT OPT C1710 1uF 6 3V TBT OPT IC1500 FALCON RIDGE TBT OPT PETP_0 AD5 PETN_0 AD7 PETP_1 AD9 PETN_1 AD11 PETP_2 AD13 PETN_2 AD15 PETP_3 AD17 PETN_3 AD19 PERST_OD_N P5 REFCLK_100_IN_P AB21 REFCLK_100_IN_N AD21 PCIE_CLKREQ_OD_N V3 PERP_0 AB9 PERN_0 AA10 PERP_1 AA12 PERN_1 AB13 PERP_2 AB15 PERN_2 AA16 PERP_3 AA18 PERN_3 AB19 GPIO_16__DEVICE_PCIE_RST_N W6 R1702 1...

Page 31: ...T OPT R1824 47K 1 TBT OPT R1823 10K 1 TBT OPT C1802 10uF 25V TBT OPT C1816 10uF 25V TBT OPT C1818 10uF 25V TBT OPT R1804 100K OPT C1810 0 1uF 16V TBT OPT C1800 10uF 25V TBT OPT POWER_CONTROL R1825 1 5K 1 TBT OPT 3 3V_UART R1820 10K 1 TBT OPT IC1801 MP2315GJ TBT OPT 3 SW 2 IN 4 GND 1 AAM 5 BST 6 EN SYNC 7 VCC 8 FB C1811 0 1uF 16V TBT OPT C1809 0 1uF 16V TBT OPT POWER_CONTROL R1803 100K OPT R1809 20...

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