LG L1930SQ, Service Manual

Page 1: ...tch 6 Language English 7 Number of pages 28 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 L1930SQSNTM LG 3828TSL085D 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 Instructions 3...

Page 2: ...Pagination sheet Pagination sheet Cover Front Cover inside 2 English 3 English 4 English 5 English English English 24 English 25 Rear Cover English 26 Rear Cover Inside 27 English English ...

Page 3: ...ITOR 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 L1930SQ L1930SQSNTM AL R Same model for Service ...

Page 4: ...5Hz 4 Max Resolution Analog 1280 x 1024 75Hz 5 POWER SUPPLY 5 1 Power AC 100 240V 50 60Hz 0 6A 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 Width 444 4 mm 17 50 Depth 108 7 mm 4 28 Height 423 8 mm 16 68 8 WEIGHT with TILT SWIVEL Net Weight 6 5 kg 14 33 lbs...

Page 5: ...e 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 circuit within the module If the surface of panel become dirty please wipe i...

Page 6: ...t receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead Always remove the test receiver ground lead last 9 Use with this receiver only the test fixtures specified in this service manual CAUTION Do not connect the test fixture ground strap to any heat sink in this receiver Electrostatically Sensitive ES Devices Some semiconductor solid state devices c...

Page 7: ...tip as the solder melts 2 Draw away the melted solder with an anti static suction type solder removal device or with solder braid before removing the IC Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush It is not necessary to reapply acrylic coati...

Page 8: ...onnection 4 Route the jumper wire along the path of the out away copper pattern and let it overlap the previously scraped end of the good copper pattern Solder the overlapped area and clip off any excess jumper wire At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins This technique involves the installation of a jumper wire on t...

Page 9: ...128 88 800 x 600 V Lines 60 317 628 600 1 4 23 6 H Pixels 49 5 46 875 1056 800 16 80 160 800 x 600 V Lines 75 0 625 600 1 3 21 7 H Pixels 57 283 49 725 1152 832 32 64 224 832 x 624 V Lines 74 55 667 624 1 3 39 8 H Pixels 65 0 48 363 1344 1024 24 136 160 1024 x 768 V Lines 60 0 806 768 3 6 29 9 H Pixels 78 75 60 123 1312 1024 16 96 176 1024 x 768 V Lines 75 029 800 768 1 3 28 10 H Pixels 100 0 68 6...

Page 10: ...up the cabinet corner side 5 1 Disassemble the cabinet 5 2 Hold the control PCB as shown in the figure and gently pull it out 6 Push up the back cover as shown in the figure and pull out the chassis assembly so that the latch is untied 2 Hold the set while folding the latch and take out the stand base 3 1 Push the cover upward and remove it 3 2 Unscrew the four screws 1 4 2 5 3 6 ...

Page 11: ... 9 7 9 8 7 Push the shield cap upward and disassemble it 9 Pull out the link cable while pushing up the main frame 8 Pull out the cable ...

Page 12: ... 1 Control Board J1 J706 J702 J705 Main Board Power Board 10 WIRING DIAGRAM Connector Ass y Main to LIPS P N 6631T2000Q Connector Ass y Main to Module P N 6631T11012W Connector Ass y Main to Control P N 6631T20024C ...

Page 13: ... 11 BLOCK DIAGRAM D SUB MST9111B including ADC LVDS SCALER MTV312 Micom LCD Module differential LIPS 5V 5V AC I nput 3 3V Reg Diode KDS184 5V 5V 12V R G B H V Sync 3 3V 2 5V 3 3V 2 5V ...

Page 14: ...on signal and outputs 8 bit R G B signal to transmitter 2 Power Part This part consists of the one 3 3V and one 1 8V regulators to convert power which is provided 5V in Power board 12V is provided for inverter 5V is provided for LCD panel and 5V for micom Also 5V is converted 3 3V and 1 8V by regulator Converted power is provided for IC in the main board The inverter converts from DC12V to AC 600V...

Page 15: ... 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 and output loading condition to achieve the dc output s...

Page 16: ... 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 17: ...ch at the front side of display 2 Press MENU POWER Switch 3 Shows the service OSD menu 4 The service OSD menu contains additional menus that the User OSD menu as described below a CLEAR ETI To initialize using time b AUTO COLOR W B balance and Automatically sets the gain and offset value c AGING Select Aging mode on off d PANEL Select using panel e NVRAM INIT EEPROM initialize 24C08 f 9300 Allows ...

Page 18: ...NO CHECK POWER BOARD AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK 5VS LINE OPEN CHECK CHECK 3 3V LINE NO CHECK X TAL YES YES YES YES YES CHECK J705 VOLTAGE PIN5 PIN6 5V CHECK U501 PIN 8 Voltage 5V IS U201 PIN114 3 3V VOLTAGE CHECK U201 PIN 122 PULSE 1 1 2 1 2 Waveforms NO PROBLEM J705 5 6 U501 8 U201 122 ...

Page 19: ...ECK LIPS CHECK MICOM INV ON OFF PORT 1 CONFIRM BRIGHTNESS OSD CONTRL STATE 2 CHECK MICOM DIM ADJ PORT LIPS YES YES YES YES J705 PIN5 PIN6 5V J705 PIN9 MORE THAN 3V J705 PIN10 5V CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL CONTACT PROBE TO CAUTION LABEL CAN YOU SEE PULSE AT YOUR SCOPE 3 3 3 Waveforms J705 9 J705 9 ...

Page 20: ...ECK PIN122 123 SOLDERING CONDITION 2 CHECK X501 3 TROUBLE IN U201 CHECK CONNECTION LINE FROM D SUB TO U501 YES YES YES U201 POWER PIN8 114 3 3V U201 PIN122 123 OSCILLATE AS 12MHZ U501 PIN43 IS 48KHz H SYNC PIN44 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS AT MODE 12 4 5 4 5 Waveforms U201 122 123 U501 43 H SYNC 5 U501 44 V SYNC ...

Page 21: ...BLE IN DPM TROUBLE IN DPM NO NO TROUBLE IN U501 CHECK PC PC IS NOT GOING INTO DPM OFF MODE CHECK H V SYNC LINE YES YES CHECK R773 R775 SYNC CHECK U501 PIN 43 44 SYNC PULSE 6 6 Waveforms R773 H Sync 6 R775 V_Sync ...

Page 22: ... 20 EXPLODED VIEW 010 020 030 060 070 070 080 100 110 090 040 050 120 130 140 ...

Page 23: ... METAL ASSEMBLY FRAME TN Q CKD 4814TKK268B SHIELD INVERTER A CKD 6871TPT271Y PWB PCB ASSEMBLY POWER M CHASSIS 1719 POWER TOTAL LIEN CHANG SOCKET 2PIN CY101 2 1000PF 450V 6871TPT271P PWB PCB ASSEMBLY POWER M CHASSIS 1719 POWER TOTAL LIEN CHANG SOCKET 2PIN CY101 2 1000PF 3313TL9063A MAIN TOTAL ASSEMBLY L1930SQM BRAND CL 64 6631T11012W CONNECTOR ASSEMBLY 30P H H 200MM UL20276 LG708G 6871TST541A PWB P...

Page 24: ...V 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 Y5 DATE 2004 08 23 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 0CK105CD56A 1UF 1608 10V 10 R TP X7R C806 0CK103CK5...

Page 25: ... OHM 1 10 W 5 1608 R TP R703 0RJ0752D677 75 OHM 1 10 W 5 1608 R TP R706 0RJ0752D677 75 OHM 1 10 W 5 1608 R TP R708 0RJ4700D677 470 OHM 1 10 W 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 1...

Page 26: ...SCHEMATIC DIAGRAM 24 1 SCALER 1 1 2 1 U201 33 30 28_RGB 2 U201 122 ...

Page 27: ... 25 2 MICOM 2 3 4 5 3 U501 17 22 4 U501 11 12 5 Q505 3 6 U502 5 6 6 ...

Page 28: ... 26 3 POWER 3 ...

Page 29: ... 27 4 CONNECTOR JACKS 4 8 7 7 J705 5V 5 6 12V 1 2 8 J703 5 8 J703 5 ...

Page 30: ...Aug 2004 P NO 3828TSL085D Printed in Korea ...