LG 32MB25VQ Service Manual Download Page 1

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North/Latin America

http://aic.lgservice.com

Europe/Africa

http://eic.lgservice.com

Asia/Oceania

http://biz.lgservice.com

Internal Use Only

Printed in

China

P/NO :

MFL67715288

508

-REV00)

CHASSIS : LM42A

MODEL : 32MB25VQ

32MB25VQ-

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

LCD MONITOR

SERVICE MANUAL

Summary of Contents for 32MB25VQ

Page 1: ...eic lgservice com Asia Oceania http biz lgservice com Internal Use Only Printed in China P NO MFL67715288 1508 REV00 CHASSIS LM42A MODEL 32MB25VQ 32MB25VQ LC CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LCD MONITOR SERVICE MANUAL ...

Page 2: ...opyright LG Electronics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 5 BLOCK DIAGRAM 10 EXPLODED VIEW 11 SCHEMATIC CIRCUIT DIAGRAM ...

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: ...cation range This spec sheet is applied all of the Monitor with LM142A chassis 2 Requirement for Test Each part is tested as below without special appointment 1 Temperature 25 C 5 C 77 F 9 F CST 40 C 5 C 2 Relative Humidity 65 10 3 Power Voltage Standard input voltage AC 100 240 V 50 60 Hz Standard Voltage of each products is marked by models 4 Specification and performance of each parts are follo...

Page 5: ...ite balance equipment CA 110 210 or equivalent Signal Generator VG 819 or VG828 or equivalent PC More than 486 computer with White balance adjust program HDCP Adjusting Jig equipment Etc Display Monitor Oscilloscope 3 EDID 3 1 EDID Protocol DDC 2AB 5 Revision Analog 3 DVI 3 HDMI 3 03 6 Serial Number 7 Week 8 Model Name 32 inch LG FHD 9 Check Sum 10 Special Item Need to Input Serial Number 3 2 Data...

Page 6: ... Generator At cut off and drive 16 step pattern for ADC Output Voltage 700 mVp p Output Mode Mode 12 1920x1080 60Hz mode Setting 4 2 4 2 Adjustment Board Assembly Line 32MB24 model use internal ADC no need connect D SUB cable Internal ADC steps as below On AC power on with Aging mode checking the ADC values and then decide to do or not Read ADC OFFSET and GAIN flags from 0xA6 0xFD 0xFE on NVRAM If...

Page 7: ...isplay status Operate the Super Resolution function and confirm variation of Luminance Make sure to do FACTORY RESET after confirmation of OSD function 4 2 5 6 Confirm the display state by inputting 8 color Bar Pattern 256 Gray Scale pattern 4 2 5 7 DPM operation confirmation Check if Power LED breathing and Power Consumption operates as standard Measurement Condition 230V 50Hz Analog Confirm DPM ...

Page 8: ...smit e DELAY 50MS f A Acknowledge 5 4 Screen adjust command LENGTH 84 5 5 EEPROM Data Write 5 5 1 Siganl TABLE LEN 84h Bytes CMD E8h ADH E2PROM Slave Address A0 A2 A4 A6 A8 AA AC AE Not 00h Reserved by Buffer To EEPROM ADL E2PROM Sub Address 00 FF Data Write data Delay 20ms 5 5 2 Command Set Use FOS Default write 14mode data write SyncFlags HPeriodH HPeriodL VtotalH VtotalL SrcHTotalH SrcHTotalL S...

Page 9: ...ttern Pattern 5 1 Dot on 1 Dot off Rectangle Pattern Pattern 6 Vertical Sync only input Use signal cable of which Pin 5 is GND Pattern 7 Horizontal Sync only input Use signal cable of which Pin 5 is GND Pattern 8 State of without Vertical Horizontal Sync and Video Signal Use signal cable of which Pin 5 is GND Pattern 9 8 Color Bar Pattern 16 Gray Level Pattern Pattern 10 SMPTE Pattern Pattern 11 1...

Page 10: ...service purposes 6 Keys Power MENU READER FUNCTION AUTO INPUT Exit NT68773H Novatek RGB R G B H V 4M SERIAL Flas h LED PANEL LGD FHD LVDS RGB IIC V_LED F B SPI Data CLK 24C02 HDMI_TMDS HDMI IIC H P HP L R out Key IIC LED White HDMI 24C0 2 DVI_TMDS DVI IIC DVI Embedded LED Driver Block BLOCK DIAGRAM ...

Page 11: ...his 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 EXPLO...

Page 12: ...EADY C176 1uF 25V READY R249 0 Y0M B Y0P B Y1M A R248 10K READY Y0P A R250 1K READY Y3M A R243 4 7K READY 12V_PANEL R242 4 7K READY P102 FI RE51S HF J R1500 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 Y0M A C175 1uF 25V READY Y3P B CLKOUTM B Y2M A Y1P A C177 1000pF 50V READY R244 4 7K READY Y3P A...

Page 13: ... 4 DATA1 1 DATA2 17 DDC CEC_GND 9 DATA0 8 DATA0_SHIELD 3 DATA2 16 SDA 7 DATA0 6 DATA1 15 SCL HDMI_RXC HDMI_HPD HDMI_5V C207 0 1uF 16V R213 4 7K R215 4 7K R231 4 7K R232 4 7K R219 10K READY HDMI_DET VA200 5 5V ADUC 5S 02 0R5L VA201 5 5V ADUC 5S 02 0R5L VA202 5 5V ADUC 5S 02 0R5L R211 33 R212 33 R229 33 R230 33 JK202 SPG09 DB 010 1 RED 2 GREEN 3 BLUE 4 GND_1 5 DDC_GND 6 RED_GND 7 GREEN_GND 8 BLUE_GN...

Page 14: ...CK SDT BCK C333 0 01uF 25V R325 5 1 R323 1K L312 BLM18PG121SN1D C334 0 01uF 25V VA303 ADUC 20S 02 010L 20V R326 10 L313 BLM18PG121SN1D C331 100uF 16V R327 10 C330 100uF 16V HP_L_OUT HP_R_OUT VA302 ADUC 20S 02 010L 20V R322 1K R324 5 1 C314 4 7uF 25V READY C317 4 7uF 25V READY C318 4 7uF 25V READY R311 56 READY R307 56 READY R308 56 READY 3 3V AMP C306 1uF 10V READY C308 68pF 50V READY C307 68pF 50...

Page 15: ... 1uF 50V R13 0 1 1W R12 0 1 1W IC1 TPS40210DGQR 3 DIS EN 2 SS 4 COMP 1 RC 5 FB 6 GND 7 ISNS 8 GDRV 9 BP 10 VDD 11 EP C8 1uF 25V R4 10K 1 16W R9 30K 1 16W C7 0 22uF 16V R2 4 7K 19VS Q2 AOD478 S D G R7 10K 1 16W R10 3 9K 1 16W 1 R15 680 1 8W 1 R5 18K 1 16W 1 LED_ON C5 100pF 50V VDT3 VDT2 VFB3 R506 1M 1 16W 1 5VS VFB1 R505 1M 1 16W 1 VFB2 Q501 2N7002K S D G R504 1M 1 16W 1 C500 1uF 10V Q500 2N7002K S...

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