LG FLATRON L1750S Service Manual Download Page 27 | Manualshive

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2. MICOM

L1750S/L1950S

MICOM

# 2

1.5K(17")

5

6

U501-#43, 44

5
6

http://www.wjel.net

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Summary of Contents for FLATRON L1750S

Page 1: ...lank 1page 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 06 L1750S SNN L1950S SNN LG 3828TSL096P KIM J O 05 01 06 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 S...

Page 2: ...heet P NO 3828TSL096P Total pages 28pages Cover English 2 English 3 English 4 English English Rear Cover Front cover Inside blank English English 22 English 23 English 24 English 25 Rear cover Inside 26 h t t p w w w w j e l n e t ...

Page 3: ...http www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO CL 82 MODEL L1750S L1750S SNN AN QF L1950S L1950S SNN AN QF Same model for Service To apply the Genesis ZAN3SL Chip h t t p w w w w j e l n e t ...

Page 4: ... 1 h t t p w w w w j e l n e t ...

Page 5: ...yp L1950S 3 SIGNAL Refer to the Timing Chart 3 1 Sync Signal Type Separate Sync SOG Sync On Green 3 2 Video Input Signal 1 Type R G B Analog 2 Voltage Level 0 0 71 V a Color 0 0 0 Vp p b Color 7 0 0 467 Vp p c Color 15 0 0 714 Vp p 3 Input Impedance 75 Ω 3 3 Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 Max Resolution Analog 1280 x 1024 75Hz 5 POWER SUPPLY 5 1 Power AC 100 240V 50 60H...

Page 6: ...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 it off with a s...

Page 7: ...ound 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 can be damaged...

Page 8: ...der 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 coating to the area...

Page 9: ...ute 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 the component s...

Page 10: ...024 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 92 978 108 0 135 0 640x350 70Hz 800x600 ...

Page 11: ... Al tape from panel Remove the 6 screws from each up of metal frame 2 3 4 5 6 Remove Al tape from control pcb fix Remove the 4 screws from each side of metal frame 1 Pull the front cover upward 2 Then let the all latches are separated 3 Put the front face down 7 8 h t t p w w w w j e l n e t ...

Page 12: ...BRT CTL INV CTL gmZAN3SL ADC Scaling PLL OSD LVDS Transmitter Panel MCU EEPROM System LVDS Analog R G B D Sub To Key Control 5V 3 3 V 1 8 V Regulator 3 3 V 1 8 V Switch System 5 V MOD ON 5V BLOCK DIAGRAM h t t p w w w w j e l n e t ...

Page 13: ...ut 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 one 1 8V regulator 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 1 8V by regulator Converted power is provided for IC in the main board 3 MICOM P...

Page 14: ... through 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 out...

Page 15: ...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 h t t p w w w w j e l n e t ...

Page 16: ... for about 5 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 Auto Color W B balance and Automatically sets the gain and offset value b NVRAM INIT EEPROM initialize 24C08 c CLEAR ETI To initialize using time d AGING Select Aging mode on off e R G B 9300K Allows you to set the R G B 9300K value manual...

Page 17: ...NG EACH POWER LINE CHECK J705 VOLTAGE PIN5 PIN6 5V NO CHECK 5VR LINE OPEN CHECK CHECK Q803 PIN 3 3 3V U803 PIN 4 1 8V NO CHECK IIC LINE CONNECTION U501 U502 CHECK U201 VCC XTAL RESET IS U201 PIN88 VOLTAGE REPEATED AS PULSE SHAPE NO YES YES YES NO PROBLEM YES CHECK KEY CONTROL CONNECTOR ROUTINE 1 1 2 1 2 Waveforms J705 5 6 U801 1 U803 3 U201 88 h t t p w w w w j e l n e t ...

Page 18: ...ICOM DIM ADJ PORT U501 PIN41 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 3 4 Waveforms J705 9 J705 9 1 3 4 Inverter Off Micom Port check J705 Inverter output Inverter On Micom Port check J705 Inverter output 1 J705 5 6 U801 1 U803 3 h t t p w w w w ...

Page 19: ...CONNECTION LINE FROM U201 TO U501 TROUBLE IN CABLE OR LCD MODULE CHECK 5VR LINE U501 PIN8 5V YES YES YES YES 3 NO RASTER OSD IS NOT DISPLAYED gmZAN3SL NO RASTER OSD IS NOT DISPLAYED U501 PIN43 IS 64KHz H SYNC PIN44 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS NO NO NO 5 2 2 5 6 Waveforms U501 43 6 U501 44 U201 88 h t t p w w w w j e l n e t ...

Page 20: ...CK R G B INPUT U201 PIN 70 74 77 NO CHECK H SYNC LINE D SUB U501 U201 PIN95 CHECK H SYNC INPUT U201 PIN 95 NO YES YES CHECK V SYNC LINE D SUB U501 U201 PIN96 CHECK V SYNC INPUT U201 PIN 96 NO YES NO RASTER OSD IS DISPLAYED 4 NO RASTER OSD IS DISPLAYED gmZAN3SL TROUBLE IN LCD MODULE YES h t t p w w w w j e l n e t ...

Page 21: ... 18 WIRING DIAGRAM Connector Ass y P N 6631T11012W or 6631T11020W Connector Ass y P N 6631T11017X L1750S 6631T11017Y L1950S Connector Ass y P N 6631T20023A or 6631T20034M h t t p w w w w j e l n e t ...

Page 22: ... 19 010 020 060 070 080 090 030 100 040 050 110 EXPLODED VIEW h t t p w w w w j e l n e t ...

Page 23: ...ND BODY 3043TKK227C TILT SWIVEL ASSEMBLY L1750S TILT STAND BODY A C SKD 3043TKK227B TILT SWIVEL ASSEMBLY L1950S TILT STAND BODY 3043TKK227D TILT SWIVEL ASSEMBLY L1950S TILT STAND BODY B C SKD 3043TKK228A TILT SWIVEL ASSEMBLY L1750S TILT STAND BASE 3043TKK228B TILT SWIVEL ASSEMBLY LX 50S TILT STAND BASE A C SKD 4951TKS199A METAL ASSEMBLY FRAME MAIN L1750 LPL A5 KUMI 4951TKS199B METAL ASSEMBLY FRAME...

Page 24: ...Y C829 0CK103CK51A 0 01UF 1608 50V 10 R TP B Y C831 0CE107EF610 100UF KMG RD 16V 20 FL BULK C831 0CE107EF628 100UF KMG RD 16V 20 FM2 5 T C SKD C832 0CE107EF610 100UF KMG RD 16V 20 FL BULK C SKD DATE 2004 12 17 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C832 0CE107EF628 100UF KMG RD 16V 20 FM2 5 T C833 0CK105CD56A 1UF 1608 10V 10 R TP X7R L1950S C834 0CC102CK41A 1000PF 1608 50V 5 R TP NP0 L1950S...

Page 25: ...677 4 7K OHM 1 10 W 5 1608 R TP R769 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R775 0RJ0682D677 68 OHM 1 10 W 5 1608 R TP R779 0RJ0682D677 68 OHM 1 10 W 5 1608 R TP R780 0RJ2001D677 2K OHM 1 10 W 5 1608 R TP R781 0RJ2001D677 2K OHM 1 10 W 5 1608 R TP R782 0RJ0471D677 4 7 OHM 1 10 W 5 1608 R TP R803 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R805 0RJ1002D677 10K OHM 1 10 W 5 1608 R TP L1750S R806 0RJ3900D677 ...

Page 26: ...SCHEMATIC DIAGRAM 23 1 SCALER L1750S L1950S ZAN3SL 1 2 U201 88 2 h t t p w w w w j e l n e t ...

Page 27: ... 24 2 MICOM L1750S L1950S MICOM 2 1 5K 17 5 6 U501 43 44 5 6 h t t p w w w w j e l n e t ...

Page 28: ... 25 3 POWER L1750S L1950S POWER 3 390 390 390 390 1 J707 5 6 U801 1 U803 3 1 1 h t t p w w w w j e l n e t ...

Page 29: ...ACKS L1750S L1950S CONNECTOR JACKS 4 15K 4 J707 2 3 J707 2 1 J707 5 6 U801 1 U803 3 1 4 3 Inverter Off Micom Port check J705 Inverter output Inverter On Micom Port check J705 Inverter output h t t p w w w w j e l n e t ...

Page 30: ...Dec 2004 P NO 3828TSL096P Printed in Korea h t t p w w w w j e l n e t ...

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