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LG FLATRON L1730S; FLATRON L1930S, Service Manual

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LG FLATRON L1730S; FLATRON L1930S Service Manual Download Page 21

- 20 -

3. NO RASTER (OSD IS NOT DISPLAYED) – MST9011B

NO RASTER

(OSD IS NOT DISPLAYED)

NO

NO

NO

TROUBLE IN CABLE 

OR LCD MODULE

CHECK U401

1. CHECK PIN169, 170 

SOLDERING CONDITION

2. CHECK X201
3. TROUBLE IN U201

CHECK CONNECTION LINE 
FROM D-SUB  TO U2 01 

YES

YES

YES

U201

POWER PIN11, 50

(3.3V)?

U201 

PIN169, 170

OSCILLATE AS

14.318MHZ?

U201

PIN181 IS 64KHz H-SYNC?

PIN182 IS 60Hz V-SYNC?

IS PULSE APPEARED 

AT SIGNAL PINS?

AT MODE 12?

Summary of Contents for FLATRON L1730S; FLATRON L1930S

Page 1: ...E 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 64 MODEL L1730S L1730SSFTM AL E L1930S L1930SSFTM AL E Same model for Service ...

Page 2: ......

Page 3: ...rizontal Vertical 2 Input Voltage Level Low 0 0 8V High 2 1 5 5V 3 Sync Polarity Positive or Negative 3 2 Video Input Signal 1 Type R G B Analog 2 Voltage Level 0 0 7 V 3 Input Impedance 75 Ω 3 3 Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 POWER SUPPLY 4 1 Power 100 240V 50 60Hz 0 6A 4 2 Power Consumption 5 ENVIRONMENT 5 1 Operating Temperature 10 C 35 C 50 F 95 F 5 2 Operating Humi...

Page 4: ...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 5: ...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 6: ...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 7: ...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 8: ...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 97...

Page 9: ...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 10: ... 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 11: ... 10 M M S T 9 1 5 1 Main Board Power Board Control Board J1 J607 J605 J603 WIRING DIAGRAM Connector Ass y P N 6631T20024C Connector Ass y P N 6631T11012W ...

Page 12: ... 11 BLOCK DIAGRAM L1730S ...

Page 13: ...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 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 700Vrms and operates ...

Page 14: ... 13 BLOCK DIAGRAM L1930S ...

Page 15: ... 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 12V 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 700Vrms and oper...

Page 16: ...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 and output loading condition to ach...

Page 17: ... 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 18: ...nt side of display 2 Wait for about 5 seconds and press MENU POWER key 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...

Page 19: ...ECK DATA LINE CONNECTION U201 U202 NO NO CHECK POWER BOARD AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK 5VS LINE OPEN CHECK NO CHECK U201 VCC XTAL RESET YES YES YES YES CHECK J603 VOLTAGE PIN5 PIN6 5V CHECK U202 PIN 32 Voltage 5V IS U201 PIN11 3 3V VOLTAGE REPEATED AS PULSE SHAPE NO PROBLEM ...

Page 20: ...IN THE LCD MODULE CHECK LIPS CHECK MICOM INV ON OFF PORT 1 CONFIRM BRIGHTNESS OSD CONTRL STATE 2 CHECK MICOM DIM ADJ PORT LIPS YES YES YES YES J603 PIN5 PIN6 5V J603 PIN9 5V J603 PIN10 5V CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL CONTACT PROBE TO CAUTION LABEL CAN YOU SEE PULSE AT YOUR SCOPE ...

Page 21: ...R LCD MODULE CHECK U401 1 CHECK PIN169 170 SOLDERING CONDITION 2 CHECK X201 3 TROUBLE IN U201 CHECK CONNECTION LINE FROM D SUB TO U2 01 YES YES YES U201 POWER PIN11 50 3 3V U201 PIN169 170 OSCILLATE AS 14 318MHZ U201 PIN181 IS 64KHz H SYNC PIN182 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS AT MODE 12 ...

Page 22: ... 21 4 TROUBLE IN DPM TROUBLE IN DPM NO NO TROUBLE IN PC CHECK PC PC IS NOT GOING INTO DPM OFF MODE TROUBLE IN SIGNAL CABLE YES YES CHECK R629 R630 SYNC CHECK U201 PIN 81 0V ...

Page 23: ... 22 EXPLODED VIEW 010 020 100 090 060 070 030 140 150 120 040 070 110 080 130 050 ...

Page 24: ...M_LPL_ANALOG L1930S 4814TKK235A SHIELD INVERTER CAP TOP L1715 L1730S 4814TKK235B SHIELD INVERTER CAP BOTTOM L1715 L1730S 4814TKK235C SHIELD INVERTER CAP L1715 TOP CKD Indonesia L1730S 4814TKK235D SHIELD INVERTER CAP L1715 BOT CKD Indonesia L1730S 4814TKK268A SHIELD INVERTER CAP L1930 L1930S 6871TPT271Y PWB PCB ASSEMBLY POWER M CHASSIS 1719 POWER TOTAL LIEN CHANG SOCKET 2PIN CY101 2 1000PF 450V L17...

Page 25: ...F 1608 50V 10 R TP X7R C253 0CE107EF610 100UF KMG RD 16V 20 FL BULK DATE 2004 6 08 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C403 0CK105CD56A 1UF 1608 10V 10 R TP X7R C405 0CC102CK41A 1000PF 1608 50V 5 R TP NP0 C406 0CK103CK51A 0 01UF 1608 50V 10 R TP B Y5 C407 0CE107EF610 100UF KMG RD 16V 20 FL BULK C408 0CE107EF610 100UF KMG RD 16V 20 FL BULK C409 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C410 ...

Page 26: ...01D677 1K OHM 1 10 W 5 1608 R TP R279 0RJ1001D677 1K OHM 1 10 W 5 1608 R TP R281 0RJ4701D677 4 7K OHM 1 10 W 5 1608 R TP R413 0RJ2202D677 22K OHM 1 10 W 5 1608 R TP R414 0RJ5600D677 560 OHM 1 10 W 5 1608 R TP R419 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R420 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP DATE 2004 6 08 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R421 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP L173...

Page 27: ... SCHEMATIC DIAGRAM 26 1 SCALER ...

Page 28: ... 27 2 POWER 4 ...

Page 29: ... 28 3 CONNECTOR ...

Page 30: ...Blank Page ...

Page 31: ...Jun 2004 P NO 3828TSL084Y Printed in Korea ...

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