LG Flatron L1720B Service Manual Download Page 3

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COLOR MONITOR

SERVICE MANUAL

Website:http://biz.LGservice.com

E-mail:http://www.LGEservice.com/techsup.html

CAUTION

BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS NO. :

CL-61

MODEL: L1720B

(L1720BM-AL**R)

( ) **Same model for Service

*Same looking with new chassis.

Issue Date; 2004.1

Summary of Contents for Flatron L1720B

Page 1: ...nguage English 7 Number of pages 29 Including blank 3page Part No 1 2 Service Guide Specification Service Guide Specification Changes 4 REV NO MM DD YY CHANGE NO CHANGE CONTENTS 1 2 3 4 5 7 6 SUFFIX L1720BM ALUSR LG 1 Origin Notification LGEDI Printed in Indonesia LGEWA Printed in U K LGESP Printed in Brazil LGEMX Printed in Mexico LGENT Printed in China LGEIL Printed in India 8 Special Instructio...

Page 2: ...Pagination sheet Pagination sheet Cover Front cover Inside Contents 2 English 3 English 4 English 5 English English Rear Cover English 22 English 23 English 24 blank Rear cover Inside blank blank ...

Page 3: ...LGservice com E mail http www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO CL 61 MODEL L1720B L1720BM AL R Same model for Service Same looking with new chassis Issue Date 2004 1 ...

Page 4: ...cal 56 75Hz 4 Max Resolution Analog 1280 x 1024 75Hz 5 POWER SUPPLY 5 1 Power AC 100 240V 50 60Hz 1 0A 5 2 Power Consumption 6 ENVIRONMENT 6 1 Operating Temperature 10 C 35 C 50 F 95 F Ambient 6 2 Relative Humidity 10 80 Non condensing 6 3 MTBF 50 000 Hours Min 7 DIMENSIONS with TILT SWIVEL FullUp Position Width 394 mm 15 51 Depth 232 mm 9 13 Height 379 mm 14 92 Folded Position Width 394mm 15 51 D...

Page 5: ... such as pencil or pen as this may result in damage to the panel Protect the module from the ESD as it may damage the electronic circuit C MOS Make certain that treatment person s body are grounded through wrist band Do not leave the module in high temperature and in areas of high humidity for a long time The module not be exposed to the direct sunlight Avoid contact with water as it may a short c...

Page 6: ...V 60 0 806 768 3 6 29 H 60 123 1312 1024 16 96 176 V 75 029 800 768 1 3 28 H 68 681 1456 1152 32 128 144 V 75 062 915 870 3 3 39 H 61 805 1504 1152 18 134 200 V 65 96 937 900 2 4 31 H 63 981 1688 1280 48 112 248 V 60 02 1066 1024 1 3 38 H 79 976 1688 1280 16 144 248 V 75 035 1066 1024 1 3 38 Mode H V Sort 1 2 3 4 5 6 7 8 9 10 11 12 13 25 175 28 321 25 175 31 5 40 0 49 5 57 283 65 0 78 75 100 0 92 ...

Page 7: ... SELECT button before entering the On Screen Display OSD This will automatically adjust your display image to the ideal settings for the current screen resolution size display mode The best display mode is 1024x768 60Hz See front control panel D sub Connect Power Connect 1 4 3 2 This feature lets you easily select the best desired image condition optimized to the environment ambient illumination i...

Page 8: ... 6 WIRING DIAGRAM J707 J702 CN1 CN2 CN4 CN5 CN3 Connector Ass y P N 6631T11016C Connector Ass y P N 6631T20024C Connector Ass y P N 6631T20008G Connector Ass y P N 6631T20023A ...

Page 9: ... w w w w V V V V o o o o l l l l t t t t a a a a g g g g e e e e D D D D i i i i f f f f f f f f e e e e r r r r e e e e n n n n t t t t i i i i a a a a l l l l S S S S i i i i g g g g n n n n a a a a l l l l i i i i n n n n g g g g LIPS 5V 5V AC I nput 3 3V Reg Diode KDS184 5V 3 3V 12V R G B H V Sync 3 3V 2 5V 3 3V 2 5V BLOCK DIAGRAM ...

Page 10: ...rpolates input to 1280 X 1024 resolution signal and outputs 8 bit R G B signal to transmitter 2 Power Part This part consists of the one 3 3V regulator and two 2 5V drop diodes to convert power which is provided 12V 5V in Power board 5V is provided for LCD panel and Micom Also 5V is converted 3 3V by regulator and 3 3V is converted 2 5V by drop diode Converted power is provided for IC in the main ...

Page 11: ...h a bridge rectifier and a bulk capacitor 3 Energy Transfer This part function is 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 and output loading condition to achive the dc output sta...

Page 12: ... is available to LCD Monitor only 1 Port Setup a Copy UserPort sys file to c WINNT system32 drivers folder b Run Userport exe c Remove all default number d Add 300 3FF e Click Start button f Click Exit button 2 EDID Read Write 1 Run WinEDID exe 2 Edit Week of Manufacture Year of Manufacture Serial Number a Input User Info Data b Click Update button c Click Write button ...

Page 13: ...or Figure 1 Cable Connection SERVICE OSD 1 Turn off the power switch at the front side of the display 2 Wait for about 3 seconds and press MENU POWER switch with 1 second interval 3 The SVC OSD menu contains additional menus that the User OSD menu as described below a MODULE To select applied module b NVRAM INIT EEPROM initialize 24C08 c ADC OFFSET The lowest value of input leves sets to digitally...

Page 14: ...UT A SHORT POINT AS OPENING EACH POWER LINE CHECK J705 VOLTAGE PIN5 PIN6 5V NO CHECK 5VS LINE OPEN CHECK CHECK U501 PIN 8 Voltage 5V NO NO NO CHECK U201 PIN 122 PULSE CHECK U201 CHECK 3 3V LINE CHECK X TAL IS U201 PIN114 3 3V VOLTAGE YES YES NO PROBLEM YES CHECK KEY CONTROL CONNECTOR ROUTINE YES ...

Page 15: ...NOT DISPLAYED CHECK LIPS J705 PIN5 PIN6 5V NO 1 CONFIRM BRIGHTNESS OSD CONTRL STATE 2 CHECK MICOM DIM ADJ PORT J705 PIN10 5V NO LIPS CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL CONTACT PROBE TO CAUTION LABEL CAN YOU SEE PULSE AT YOUR SCOPE NO REPLACE CCFL LAMP IN THE LCD MODULE YES YES YES YES ...

Page 16: ...O CHECK U801 U201 PIN122 123 OSCILLATE AS 12MHZ CHECK CONNECTION LINE FROM D SUB TO U501 TROUBLE IN CABLE OR LCD MODULE YES YES YES 3 NO RASTER OSD IS NOT DISPLAYED MST9111B NO RASTER OSD IS NOT DISPLAYED U501 PIN43 IS 64KHz H SYNC PIN44 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS AT MODE 12 NO NO ...

Page 17: ... 15 4 TROUBLE IN DPM TROUBLE IN DPM TROUBLE IN U501 CHECK PC PC IS NOT GOING INTO DPM OFF MODE NO CHECK H V SYNC LINE NO YES YES CHECK R773 R775 SYNC CHECK U501 PIN 43 44 SYNC PULSE ...

Page 18: ... 16 EXPLODED VIEW 4 1 2 3 12 10 11 13 5 6 8 9 7 ...

Page 19: ...TAL DISPLAY LM170E01 A5M1 LG PHILPS TFT COLOR SXGA LVDS PEM NUT LCD LIQUID CRYSTAL DISPLAY LM170E01 A5 LG PHILPS TFT COLOR LVDS SXGA LCD LIQUID CRYSTAL DISPLAY LM170E01 A4 LG PHILPS TFT COLOR 17 TFT LCD BACK COVER ASSEMBLY L1720 SILVER SPRAY TILT SWIVEL ASSEMBLY L1720B PL M BASE SPRAY_NEW SCREW RUBBER PWB PCB ASSEMBLY SUB L1720BL CONTROL TOTAL BRAND CL 43 METAL ASSEMBLY FRAME MAIN L1720BM LPL CONN...

Page 20: ...608 50V 10 R TP X7R C734 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C735 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C760 0CE107EF610 100UF KMG RD 16V 20 FL BULK C801 0CK103CK51A 0 01UF 1608 50V 10 R TP B Y DATE 2003 1 9 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C803 0CE107EF610 100UF KMG RD 16V 20 FL BULK C804 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C805 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C806 0CK1...

Page 21: ... 5 1608 R TP R709 0RJ1001D677 1K OHM 1 10 W 5 1608 R TP R716 0RJ4701D677 4 7K OHM 1 10 W 5 1608 R TP R717 0RJ4701D677 4 7K OHM 1 10 W 5 1608 R TP R720 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R722 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R723 0RJ0332D677 33 OHM 1 10 W 5 1608 R TP R724 0RJ0332D677 33 OHM 1 10 W 5 1608 R TP R726 0RJ1002D677 10K OHM 1 10 W 5 1608 R TP R727 0RJ1002D677 10K OHM 1 10 W 5 1608...

Page 22: ...5 56 57 58 59 60 61 62 63 64 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 NC AVSS NC NC AVSS NC NC AVDD NC NC AVSS NC NC AVDD REXT AVDD_PLL AVSS_PLL AVDD AVSS NC NC NC NC NC NC NC BIN0M BIN0 GIN0M GIN0 SOGIN0 RIN0M RIN0 AVSS AVDD RMID REFP REFM AVSS_PLL NC NC NC NC LVB0M LVB0P GNDP VDDP LVB1M LVB1P LVB2M LVB2P LVBCKM LVBCKP LV...

Page 23: ...SCHEMATIC DIAGRAM 21 1 SCALER 1 ...

Page 24: ... 22 2 MICOM 2 ...

Page 25: ... 23 3 POWER 3 ...

Page 26: ... 24 4 CONNECTOR JACKS 4 ...

Page 27: ...Blank Page1 ...

Page 28: ...Blank Page2 ...

Page 29: ...Blank Page3 ...

Page 30: ...Jan 2004 P NO 3828TSL084G Printed in Korea ...

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