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LG FLATRON L1550S-BN, Service Manual

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LG FLATRON L1550S-BN Service Manual Download Page 17

- 15 -

2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS

NO RASTER

(OSD IS NOT DISPLAYED)

NO

NO

NO

NO

REPLACE CCFL LAMP

IN THE LCD MODULE

CHECK POWER BOARD,
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

J707

PIN5, PIN6

5V?

J707 PIN2

2.5V?

J707 PIN1

5V?

CHECK 

PULSE AS 

CONTACTING SCOPE 

PROBE TO CAUTION LABEL.

(CONTACT PROBE TO 

CAUTION LABEL.

CAN YOU SEE PULSE 

AT YOUR 

SCOPE?

Summary of Contents for FLATRON L1550S-BN

Page 1: ...Including blank 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 03 18 L1550S SNN L1550S BNN LG 3828TSL094N KIM J O 05 03 18 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 i...

Page 2: ...t Pagination sheet P NO 3828TSL094N 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 ...

Page 3: ...om 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 L1550S SN L1550S SNN AB EP AN EP L1550S BN L1550S BNN AB EP AN EP Same model for Service To apply the MSTAR Chip ...

Page 4: ... min 250 Typ 2 3 Contrast Ratio 300 min 400 Typ 3 SIGNAL Refer to the Timing Chart 3 1 Sync Signal Type Separate Sync 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 63kHz Vertical 56 75Hz 4 Max Resolution D sub Analog 1024 x 768 75Hz 5 POWER SUPPLY 5 1...

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: ...els 31 5 37 50KHz 840 640 16 64 120 640 x 480 V Lines 75 0 Hz 500 480 1 3 16 7 H Pixels 36 0 35 156 KHz 1024 800 24 72 128 800 x 600 V Lines 56 25 Hz 625 600 1 2 22 8 H Pixels 40 0 37 879 KHz 1056 800 40 128 88 800 x 600 V Lines 60 3 Hz 628 600 1 4 23 9 H Pixels 50 0 48 077 KHz 1040 800 56 120 64 800 x 600 V Lines 72 188 Hz 666 600 37 6 23 10 H Pixels 49 5 46 875 KHz 1056 800 16 80 160 800 x 600 V...

Page 10: ...up of metal frame 1 1 Pull the front cover upward 2 Then let the all latches are separated 3 Put the front face down Remove Al tape from control pcb fix Pell off Al tape from panel 2 3 4 5 6 Remove the 4 screws from each side of metal frame Disassemble back cover 7 ...

Page 11: ...NPUT SWITCHING TMDS MTV312 MICOM LCD Module R G B differential LIPS 5V 3 3V AC Input TSU16AL TR KTA 1273 12V R G B H V Sync 1 8V 3 3V1 1 8V 3 3V1 3 3V Reg 78D33 5V 3 3V1 3 3V Reg 78D33 5V 3 3V LVDS Low Voltage Differential Signaling BLOCK DIAGRAM ...

Page 12: ...alog to digital interpolates input to 1024 x 768 resolution signal and outputs 8 bit R G B signal to transmitter 2 Power Part This part consists of the two 3 3V regulator to convert power which is provided 12V 5V in Power board and Micom 3 3V is provided for LCD panel Also 5V is converted 3 3V by regulator and 3 3V and 1 8V are provided for scaler Converted power is provided for IC in the main boa...

Page 13: ...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 14: ... 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 15: ...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 16: ...HECK 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 J707 VOLTAGE PIN5 PIN6 5V CHECK U501 PIN VOLTAGE 5V IS U201 PIN90 3 3V VOLTAGE CHECK U201 PIN 96 PULSE 1 NO PROBLEM 1 Waveforms U201 96 ...

Page 17: ...OARD 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 J707 PIN5 PIN6 5V J707 PIN2 2 5V J707 PIN1 5V CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL CONTACT PROBE TO CAUTION LABEL CAN YOU SEE PULSE AT YOUR SCOPE ...

Page 18: ... 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 19: ...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 20: ... 18 WIRING DIAGRAM Connector Ass y P N 6631T11022C Connector Ass y P N 6631T11012R ...

Page 21: ...EXPLODED VIEW 19 010 060 020 070 080 090 040 050 100 030 ...

Page 22: ... 3043TKK241B TILT SWIVEL ASSEMBLY L1550 TILT STAND BODY A C SKD 3043TKK242A TILT SWIVEL ASSEMBLY L1550 TILT STAND BASE 3043TKK242B TILT SWIVEL ASSEMBLY L1550 TILT STAND BASE A C SKD 6871TSTA51A PWB PCB ASSEMBLY SUB L1550SN CONTROL TOTAL BRAND GUMI LF 6871TSTA51C PWB PCB ASSEMBLY SUB L1550SN CONTROL TOTAL BRAND LGEDI LF C SKD EUROPE UK 6871TSTA51B PWB PCB ASSEMBLY SUB L1550SN CONTROL TOTAL BRAND LG...

Page 23: ...G RD 16V 20 FM2 5 T C SKD PANAMA C817 0CK105CD56A 1UF 1608 10V 10 R TP X7R C818 0CC102CK41A 1000PF 1608 50V 5 R TP NP0 C819 0CK105CD56A 1UF 1608 10V 10 R TP X7R DATE 2005 03 16 S AL LOC NO PART NO DESCRIPTION SPECIFICATION D701 0DSIH00018A ENKMC2837 T112 LF ISAHAYA R D702 0DSIH00018A ENKMC2837 T112 LF ISAHAYA R D706 0DSIH00018A ENKMC2837 T112 LF ISAHAYA R ZD701 0DZ560009GB BZT52C5V6S F LF DIODES R...

Page 24: ...01D677 4 7K OHM 1 10 W 5 1608 R TP R749 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R751 0RJ4700D677 470 OHM 1 10 W 5 1608 R TP R752 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R753 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R754 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R755 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R770 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R771 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R778 0RJ0682D677 68...

Page 25: ... 23 SCHEMATIC DIAGRAM 1 TSU56AL TSU16AL 1 Waveforms U201 96 97 3 R216 R778 H Sync 3 R217 R781 V Sync 1 3 ...

Page 26: ... 24 2 MICOM 2 U501 43 H SYNC 2 U501 44 V SYNC Waveforms 2 ...

Page 27: ... 25 3 POWER ...

Page 28: ... 26 4 CONNECTOR JACKS 3 Waveforms R216 R778 H Sync 3 R217 R781 V Sync 3 ...

Page 29: ...Mar 2005 P NO 3828TSL094N Printed in Korea ...

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