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LG FLATRON L1721B, Service Manual

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LG FLATRON L1721B Service Manual Download Page 19

- 17 -

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

NO RASTER

(OSD IS NOT DISPLAYED)

NO

NO

NO

TROUBLE IN CABLE 

OR LCD MODULE

CHECK U801 (17", 19")
CHECK U803 (15")

1. CHECK PIN122, 123 

SOLDERING CONDITION

2. CHECK X501
3. TROUBLE IN U201

CHECK CONNECTION LINE 
FROM D-SUB  TO U501 

YES

YES

YES

U201

PIN 18, 90

3.3V?

U201 

PIN96, 97

OSCILLATE AS

12MHZ?

U501

PIN43 IS 48KHz H-SYNC?

PIN44 IS 60Hz V-SYNC?

IS PULSE APPEARED 

AT SIGNAL PINS?

AT MODE 12?

1

2

1

2

Waveforms

U201-#96, 97

U501-#43 H-SYNC

2

U501-#44 V-SYNC

Summary of Contents for FLATRON L1721B

Page 1: ...ages 32 Including blank 2pages 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 05 04 L1721BN L1921BN LG 38289S0001D KIM J O 05 05 04 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 Printe...

Page 2: ... Pagination sheet P NO 38289S0001D Total pages 32pages Cover English 3 English 4 English 5 English English Rear Cover Front cover Inside 2 English English 27 English 28 English 29 English blank Rear cover Inside 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 82 MODEL L1721B L1721BN AN EP L1921B L1921BN AL EP Same model for Service To apply the MSTAR Chip ...

Page 4: ... 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 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 HRS with 90 Confidenc...

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: ... 480 1 3 16 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 Lin...

Page 10: ... SCALER INPUT SWITCHING TMDS MTV312 MICOM LCD Module R G B differential LIPS 5V 5V AC I nput TSU16AL TR KTA 1273 12V R G B H V Sync 1 8V 3 3V 1 8V 3 3V1 3 3V Reg 78D33 5V 3 3V LVDS Low Voltage Differential Signaling BLOCK DIAGRAM L1721B ...

Page 11: ... analog to digital interpolates 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 3 3V regulator to convert power which is provided 12V 5V in Power board 5V is provided for MICOM and LCD panel 5V is converted 3 3V by regulator and 3 3V is converted 1 8V by scaler KTA1273 Converted power is provided for IC in the main board 3...

Page 12: ... SCALER INPUT SWITCHING TMDS MTV312 MICOM LCD Module R G B differential LIPS 5V 12V AC I nput TSU16AL TR KTA 1273 12V R G B H V Sync 1 8V 3 3V 1 8V 3 3V1 3 3V Reg 78D33 5V 3 3V LVDS Low Voltage Differential Signaling BLOCK DIAGRAM L1921B ...

Page 13: ...o digital interpolates 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 3 3V regulator to convert power which is provided 12V 5V in Power board 12V is provided for LCD panel and 5V is provided for MICOM 5V is converted 3 3V by regulator and 3 3V is converted 1 8V by scaler KTA1273 Converted power is provided for IC in the m...

Page 14: ...gh 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 st...

Page 15: ... 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 16: ...display 2 Wait 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 9300...

Page 17: ...ECK U201 NO NO 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 CHECK J705 VOLTAGE PIN5 PIN6 5V CHECK U501 PIN 8 VOLTAGE 5V IS U201 PIN90 3 3V VOLTAGE CHECK U201 PIN 96 PULSE 1 NO PROBLEM 1 Waveforms U201 96 ...

Page 18: ...ARD AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE 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 2 5V J705 PIN10 5V CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL CONTACT PROBE TO CAUTION LABEL CAN YOU SEE PULSE AT YOUR SCOPE ...

Page 19: ... U803 15 1 CHECK PIN122 123 SOLDERING CONDITION 2 CHECK X501 3 TROUBLE IN U201 CHECK CONNECTION LINE FROM D SUB TO U501 YES YES YES U201 PIN 18 90 3 3V U201 PIN96 97 OSCILLATE AS 12MHZ U501 PIN43 IS 48KHz H SYNC PIN44 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS AT MODE 12 1 2 1 2 Waveforms U201 96 97 U501 43 H SYNC 2 U501 44 V SYNC ...

Page 20: ...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 R216 R217 R778 R781 CHECK U501 PIN 43 44 SYNC PULSE 3 3 Waveforms R216 R778 H Sync 3 R217 R781 V Sync ...

Page 21: ... 19 WIRING DIAGRAM Connector Ass y P N 6631T11012W or 6631T11020W Connector Ass y P N 6631T20024C Connector Ass y P N 6631T20008G Connector Ass y P N 6631T20023A ...

Page 22: ...EXPLODED VIEW L1721B 20 010 020 050 060 070 080 090 100 130 110 120 030 040 ...

Page 23: ...OLOR PB FREE OF A5KS NEC D IC 250NITS SXGA LVDS or 6304FLP199A LCD LIQUID CRYSTAL DISPLAY LM170E01 A6K3 LG PHILPS TFT COLOR 8MS LPL NJ KUMI PB FREE EGI SS S D IC EGI 250NITS SXGA LVDS or 6304FLP200A LCD LIQUID CRYSTAL DISPLAY LM170E01 A6K4 LG PHILPS TFT COLOR 8MS LPL NJ KUMI PB FREE EGI TI S D IC SXGA LVDS 3809TKL059U BACK COVER ASSEMBLY L1721BN ABS WHITE WA LOCAL 3809TKL059T BACK COVER ASSEMBLY L...

Page 24: ...EXPLODED VIEW L1921B 22 010 020 140 090 080 070 060 050 100 030 120 040 110 130 ...

Page 25: ... ASSEMBLY 30P H H 200MM UL20276 LG708G or 6631T11020W CONNECTOR ASSEMBLY 30P 30P H H 200MM UL20276AWG30 CD PB FREE 17 19 INCH 6871TPT282M PWB PCB ASSEMBLY POWER M CHASSIS 19LPL DOCKING 2PIN 78R12 450V POWER TOTAL LIEN CHANG PB FREE 3313TL9073A MAIN TOTAL ASSEMBLY L1920BN MSTAR 10 LANGUAGE BRAND CL 66 4815TKK034B SHIELD ASSEMBLY REAR REAR L1920P B A C SKD 3550TKK425E COVER L1921 BACK CAP C CKD ABS ...

Page 26: ...0CC102CK41A 1000PF 1608 50V 5 R TP NP0 LPL C819 0CK105CD56A 1UF 1608 10V 10 R TP X7R DATE 2005 05 04 S AL LOC NO PART NO DESCRIPTION SPECIFICATION D701 0DS226009AA KDS226 TP KEC 80V 4NSE LPL TN D701 0DSIH00018A ENKMC2837 T112 LF ISAHAYA R LPL D702 0DS226009AA KDS226 TP KEC 80V 4NSE LPL TN D702 0DSIH00018A ENKMC2837 T112 LF ISAHAYA R LPL D706 0DS226009AA KDS226 TP KEC 80V 4NSE LPL TN D706 0DSIH0001...

Page 27: ...TP R754 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R755 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R769 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R778 0RJ0682D677 68 OHM 1 10 W 5 1608 R TP R781 0RJ0682D677 68 OHM 1 10 W 5 1608 R TP R803 0RH0000D622 0 OHM 1 10 W 2012 5 00 D LPL TN R804 0RJ1002D677 10K OHM 1 10 W 5 1608 R TP LPL TN R805 0RH2000D622 200 OHM 1 10 W 5 D R TP LPL TN R806 0RH2000D622 200 OHM 1 10 W 5...

Page 28: ...SCHEMATIC DIAGRAM 26 1 TSU56AL TSU16AL 1 Waveforms U201 96 97 3 R216 R778 H Sync 3 R217 R781 V Sync 1 3 ...

Page 29: ... 27 2 MICOM 2 U501 43 H SYNC 2 U501 44 V SYNC Waveforms 2 ...

Page 30: ... 28 3 POWER ...

Page 31: ... 29 4 CONNECTOR JACKS 3 Waveforms R216 R778 H Sync 3 R217 R781 V Sync 3 ...

Page 32: ...Blank Page1 ...

Page 33: ...Blank Page2 ...

Page 34: ...May 2005 P NO 38289S0001D Printed in Korea ...

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