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LG FLATRON L1780Q, Service Manual

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LG FLATRON L1780Q Service Manual Download Page 18

- 16 -

TROUBLESHOOTING GUIDE

1. NO POWER

NO  POWER

(POWER INDICATOR OFF)

CHECK POWER

ADAPTER 

CHECK 

J609 1,2,3 PIN

12V?

NO

CHECK U801 IC

U801 PIN 3 

5V?

NO

CHECK DATA LINE

CONNECTION

U402 PIN-3

1.8V?

NO

YES

YES

NO PROBLEM

YES

CHECK U201

VCC,XTAL,RESET

1

2

WAVE FORM

J609-#1,2,3

U401-#3

3

U402-#3

1

3

CHECK U401

U401 PIN 3 

3.3V?

NO

2

Summary of Contents for FLATRON L1780Q

Page 1: ...ges 32 Including blank 3pags Part No 1 2 Service Guide Specification Service Guide Specification Changes 4 REV NO MM DD YY SIGNATURE CHANGE NO CHANGE CONTENTS 1 2 3 4 5 7 6 SUFFIX LEE H J 05 01 25 L1780QN L1980QN LG 3828TSL096T KIM J O 05 01 25 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 ...

Page 2: ...Pagination sheet P NO 3828TSL096T Total pages 32pages Cover English 3 English 4 English 5 English English Rear Cover Front cover Inside 2 English English 27 English 28 English blank English blank Rear cover Inside blank ...

Page 3: ...ail http www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO CL 68 MODEL L1780Q L1780QN AN G L1980Q L1980QN AN G Same model for Service SOURCE SOURCE MENU MENU AUTO SELECT AUTO SELECT ENGINE ENGINE ...

Page 4: ... the Timing Chart 3 1 Sync Signal Type Separate Sync Digital SOG Sync On Green 3 2 Video Input Signal 1 Type R G B Analog 2 Voltage Level 0 0 7 V a Color 0 0 0 Vp p b Color 7 0 0 35 Vp p c Color 15 0 0 7 Vp p 3 Input Impedance 75 Ω 3 3 Operating Frequency Horizontal Analog 30 83kHz Horizontal Digital 30 71kHz Vertical 56 75Hz 4 MAX RESOLUTION D sub Analog 1280 x 1024 75Hz DVI Digital Analog 1280 x...

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: ...st 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 ...

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: ... 5 H Pixels 40 0 37 879 1056 800 40 128 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 8...

Page 10: ...move the three EMI shield screws 2 1 Hinge Rear Cover Loosen the catch of the right latch as shown Loosen the catch of the left latch of the hinge rear cover as shown and remove the hinge rear cover completely 1 2 1 2 2 3 1 3 2 3 3 Remove the four stand assembly screws in the same way Take the main cable out carefully by hand ...

Page 11: ...up and out 4 1 4 2 Lift up the back cover a little by inserting a tool into the hole while pressing the cabinet on the bottom right of the back cover with your left hand Sequence of disassembling the back cover Lift up the next cover in the same way 4 3 ...

Page 12: ...SD Power panel Remove the two screws and separate cabinet and middle cover 5 4 4 4 4 4 4 Lift up the cover with your left hand in the sequence 1 4 and open up the back cover with your right hand from the bottom left 4 4 ...

Page 13: ...522 1 LVDS Transmitter CODE MEMORY EEPROM 24 C02 2EA LVDS Analog R G B D Sub To Key Control 5V 3 3 V Regulator 3 3 V 1 8 V Digital R G B DVI D Inverter Adapter 5V 1 8 V TMDS MCU ADC Scaler PLL OSD DC DC Control IC BLOCK DIAGRAM ...

Page 14: ...nal 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 opera...

Page 15: ...C 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 achi...

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: ...G B 9300K value manually f R G B 6500K Allows you to set the R G B 6500K value manually g R G B Offset Allows you to set the R G B Offset value manually Analog Only h R G B Gain Allows you to set the R G B Gain value manually Analog Only i MODULE To select applied module 220 IBM Compatible PC PARALLEL PORT Power inlet required Power LED ST Switch Power Select Switch 110V 220V Control Line N o t u ...

Page 18: ...ATOR OFF CHECK POWER ADAPTER CHECK J609 1 2 3 PIN 12V NO CHECK U801 IC U801 PIN 3 5V NO CHECK DATA LINE CONNECTION U402 PIN 3 1 8V NO YES YES NO PROBLEM YES CHECK U201 VCC XTAL RESET 1 2 WAVE FORM J609 1 2 3 U401 3 3 U402 3 1 3 CHECK U401 U401 PIN 3 3 3V NO 2 ...

Page 19: ...ER 12V J603 PIN 1 2 12V NO NO RASTER OSD IS NOT DISPLAYED CHECK U201 PIN 68 HIGH J603 PIN 7 3V NO CHECK U201 NO U201 PIN 67 HIGH NO CHECK U201 NO CHECK INVERTER CHECK INVERTER LAMP PULSE NO REPLACE LCD MODULE YES YES YES YES J201 PIN 1 2 3 5V U403 IC CHECK YES ...

Page 20: ... 18 3 TROUBLE IN DPM TROUBLE DPM TROUBLE IN PC CHECK U201 NO NO TROBLE IN SIGNAL CABLE YES YES CHECK U201 PIN 181 182 J609 PIN 15 16 ...

Page 21: ... 19 WIRING DIAGRAM Connector Ass y P N 6631T11020Q Connector Ass y P N 6631T12006F Connector Ass y P N 6631T12006E ...

Page 22: ... 20 010 020 050 070 060 080 090 100 230 110 120 130 140 150 160 180 170 210 200 190 030 040 220 240 250 260 EXPLODED VIEW ...

Page 23: ... 68 3313TL9048A MAIN TOTAL ASSEMBLY L1980UN BRAND CL 68 3313TL9048D MAIN TOTAL ASSEMBLY L1980QN L1981QN MX C SKD BRAND CL 68 4951TKS185A METAL ASSEMBLY FRAME MAIN L1780UN 4951TKS185B METAL ASSEMBLY FRAME MAIN L1780UN C SKD 4951TKS186A METAL ASSEMBLY FRAME MAIN L1980UN 4951TKS186B METAL ASSEMBLY FRAME 1980UN A C SKD 3550TKK666A COVER L173UPN BACK RING DECO 3550TKK666B COVER L173UPN BACK RING DECO C...

Page 24: ...O 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 Y C407 0CH8107F611 100UF 16V M 85STD CYL R TP C408 0CH8107F611 100UF 16V M 85STD CYL R TP C409 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C410 0CC102CK41A 1000PF 1608 50V 5 R TP NP0 C411 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C412 0CC102CK...

Page 25: ...77 10K OHM 1 10 W 5 1608 R TP R208 0RJ0472D677 47 OHM 1 10 W 5 1608 R TP R209 0RJ0471D677 4 7 OHM 1 10 W 5 1608 R TP R212 0RJ0822D677 82 OHM 1 10 W 5 1608 R TP R214 0RJ3301D677 3 3K OHM 1 10 W 5 1608 R TP R215 0RJ4702D677 47000 OHM 1 10 W 5 1608 R T R216 0RJ0472D677 47 OHM 1 10 W 5 1608 R TP R217 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R218 0RJ1002D677 10K OHM 1 10 W 5 1608 R TP R220 0RJ0822D677 82...

Page 26: ...P0 C16 0CC102CK41A 1000PF 1608 50V 5 R TP NP0 C17 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C18 0CC220CK41A 22PF 1608 50V 5 R TP NP0 C19 0CC220CK41A 22PF 1608 50V 5 R TP NP0 C2 0CC220CK41A 22PF 1608 50V 5 R TP NP0 C20 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C21 0CC470CK41A 47PF 1608 50V 5 R TP NP0 C22 0CC470CK41A 47PF 1608 50V 5 R TP NP0 C3 0CC470CK41A 47PF 1608 50V 5 R TP NP0 C4 0CC220CK41A 22PF 1608...

Page 27: ...SCHEMATIC DIAGRAM 25 1 SCALER ...

Page 28: ... 26 2 DC DC POWER 2 3 2 U401 3 3 U402 3 WAVE FORM ...

Page 29: ... 27 3 CONNECTOR 1 1 J609 1 2 3 WAVE FORM ...

Page 30: ... 28 4 KEY ...

Page 31: ...Blank Page1 ...

Page 32: ...Blank Page2 ...

Page 33: ...Blank Page3 ...

Page 34: ...Feb 2005 P NO 3828TSL096T Printed in Korea ...

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