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LG StudioWorks 520Si, Owner'S Manual, Page: 25 / 40

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LG StudioWorks 520Si Owner'S Manual Download Page 25

TROUBLESHOOTING GUIDE

- 14 -

BASIC GUIDE

FOLLOW
NO POWER
PROCEDURE

FOLLOW

NO RASTER

PROCEDURE

FOLLOW
NO VERTICAL
DEFLECTION 
PROCEDURE

FOLLOW
NO CHARACTER,
NO CONTRAST
PROCEDURE

FOLLOW OTHER

PROCEDURES.

CHECK

SMPS SECONDARY

B+ OUTPUT.

CHECK 

HORIZONTAL

OUTPUT

WAVEFORM.

CHECK 

VERTICAL OUTPUT

WAVEFORM.

CHECK 

VIDEO OUTPUT

WAVEFORM.

NO

YES

YES

YES

YES

NO

NO

NO

Summary of Contents for StudioWorks 520Si

Page 1: ...ÈÌ È ÌÓÏ ÔÔ Ú Ú ËÌÙÓ Ï ˆËˇ Ì ıÓ ËÚÒˇ Ì ÚËÍÂÚÍÂ Ô ËÍÎÂÂÌÌÓÈ Í Á ÌÂÈ Ô ÌÂÎË ÏÓÌËÚÓ ÒÎÛ Â ÌÂÓ ıÓ ËÏÓÒÚË ÂÏÓÌÚ ÒÓÓ ËÚ ÚÛ ËÌÙÓ Ï ˆÌ ÂÏÛ ËÎÂ Û ÂÚÌÓÈ ÏÓÌËÚÓ CH01 P NO 3828TUL057B S 9909 Printed in CHINA ÛÍÓ Ó ÒÚ Ó ÔÓÎ ÁÓ ÚÂΡ OWNER S MANUAL Internet Address http www lg ru ÌÙÓ Ï ˆËÓÌÌ ˇ ÒÎÛÊ LG Electronics 095 742 77 77 StudioWorks 520Si http www lge co kr ...

Page 2: ...ase Installation A4 Installation Connections A5 Location and Function of Controls Front View A6 Rear View A6 Image Control Panel A7 Power Management System MPR II and DDC Power Management System A9 Low Radiation Compliance MPR II A9 DDC Display Data Channel A9 General Operation Video Memory Modes A10 Troubleshooting and Service Troubleshooting A11 Service A12 Specifications A13 ...

Page 3: ...odel No Serial No Notice All rights reserved Reproduction in any manner in whole or in part is strictly prohibited without the written permission of LG Electronics Inc Trademark Acknowledgments LG is a trademark of LG Electronics Inc IBM is a registered trademark and VGA is a trademark of International Business Machines Corporation WARNING To reduce the risk of fire or electric shock do not expose...

Page 4: ...a power source indicated in the specifications of this manual or listed on the monitor If you are not sure what type of power supply you have in your home consult with your dealer 4 Overloaded AC outlets and extension cords are dangerous So are frayed power cords and broken plugs They may result in a shock or fire hazard Call your service technician for replacement 5 DO NOT OPEN THE MONITOR There ...

Page 5: ...g pool 3 Monitors are provided with ventilation openings in the cabinet to allow the release of heat generated during operation If these openings are blocked built up heat can cause failures which may result in a fire hazard Therefore NEVER Block the bottom ventilation slots by placing the monitor on a bed sofa rug etc Place the monitor in a built in enclosure unless proper ventilation is provided...

Page 6: ...Insert the hooks into slots 3 Slide the tilt swivel stand toward the front of the monitor until the latches click into the locked position 4 Carefully upright the monitor taking care to place the monitor down flatly on an even surface NOTE To remove the stand gently push in the latch on the bottom of the monitor and then slide the stand toward the back of the monitor After sliding the stand back l...

Page 7: ...nd the computer so that you can easily get to the back panel of each 3 Connect the signal cable with D sub connector to the graphics board on your PC as described in your PC Owner s Manual 4 Tighten the screws on the video cable connectors to keep them from coming loose and to prevent radio and TV interference 5 Connect the power cord to the AC receptacle on the back of the monitor Plug the other ...

Page 8: ...A6 Location and Function of Controls Contrast Power On Off Button Power Indicator Front View Rear View AC Power Connector Signal Cable ID Label Brightness Image Control Panel ...

Page 9: ...decrease the display contrast Brightness Used to adjust the brightness of the screen Move the thumbwheel located beneath this indicator to increase or decrease the display brightness Image Control Panel Image Selection and Adjustment buttons Use either the or button to select the icons which you wish to adjust and display buttons Used to set digital values for each of the select on screen control ...

Page 10: ...just image height Decreases the size of the screen image Increases the size of the screen image To correct the bowing in and out of the image Curves the image s edges inwards Curves the image s edges outwards To correct geometric distortion Makes the screen image narrower at the top Moves the screen image wider at the top Horizontal Position Description icon Horizontal Size Vertical Position Verti...

Page 11: ...ation emissions offering the user extra shielding and an anti static screen coating These guidelines set forth by a government agency in Sweden limits the amount of emission allowed in the Extremely Low Frequency ELF and Very Low Frequency VLF electromagnetic range DDC Display Data Channel DDC is a communication channel over which the monitor automatically informs the host system PC about its capa...

Page 12: ...ith a variety of video standards automatically The Scanning Mode Table below indicates the resolution as well as the horizontal and vertical refresh rates of some of the modes that this monitor can match to the output of your PC s graphics card Other resolutions and standards can also be synchronized and displays on this monitor as long as they are within the horizontal and vertical frequency rang...

Page 13: ...s outside the operating range of the monitor HORZ 30kHz 54kHz VERT 50Hz 120Hz The image on the SCREEN is not centered or too small or not a rectangle shape Image adjustment not been done yet in the current operating mode Use the SELECT and buttons to set the image to your liking The monitor doesn t enter the power saving off mode Amber led Computer video signal is not VESA DPMS standard Enter the ...

Page 14: ... extensive work by a qualified technician to restore the monitor to normal operation The monitor has been dropped or the cabinet has been damaged The monitor exhibits a distinct change in performance Snapping or popping from the monitor is continuous or frequent while the monitor is operating It is normal for some monitors to make occasional sounds when being turned on or off or switching video mo...

Page 15: ...e sync H Sync H Sync V Sync V Sync Pin Separate Sync 1 Red 2 Green 3 Blue 4 Ground 5 Self Test 6 Red Ground 7 Green Ground 8 Blue Ground 9 NC 10 Ground 11 Ground 12 SDA 13 Horiz Sync 14 Vert Sync 15 SCL 1 5 6 10 11 15 Signal Connector Pin Assignment ...

Page 16: ...Sub type Power input 100 240VAC 50 60Hz 1 5A Power Consumption Table Dimensions 360 x 386 x 388 6 mm With Tilt Swivel Stand WXDXH 14 2 x 15 2 x 14 9 inch Weight net 12 5 kg 27 6 lbs Information in this document is subject to change without notice and does not represent a commitment on the part of LG Electronics Inc MODE Normal Stand by Suspend Off H sync On Off On Off V sync On On Off Off Power Co...

Page 17: ...4kHz Vertical 50 120Hz 3 POWER SUPPLY 3 1 Power Range AC 90 264V Free Voltage 50 60Hz 1 5A Max 3 2 Power Consumption 4 DISPLAY AREA 4 1 Active Video Area 270x195mm 10 63 x7 68 Available for Full Screen 4 2 Display Color Full Colors 4 3 Display Resolution 1024x768 60Hz Non Interlace 4 4 Video Bandwidth 65MHz 5 ENVIRONMENT 5 1 Operating Temperature 0 35 C 32 95 F Ambient 5 2 Relative Humidity 10 90 ...

Page 18: ... 24 2 MAIN BOARD Solder Side ...

Page 19: ...PRINTED CIRCUIT BOARD 23 1 MAIN BOARD Component Side ...

Page 20: ...P FZMY GW18 CDT EARTH DEGAUSSING COIL VIDEO SHIELD FRONT VIDEO SHIELD REAR PLATE HEAT SINK FOR Q341 Q351 Q361 FBT FMMPC51 M1017E PLATE HEAT SINK FOR IC601 PLATE SUB HEAT SINK FOR D505 Q503 Q506 PLATE HEAT SINK FOR D505 Q503 Q506 PLATE GROUND TERMINAL AC SOCKET ASS Y PLATE HEAT SINK FOR Q901 SCREW PTP 4x20BP FZMY PIECE REAR COVER MAIN BRACKET KNOB CONTROL BOTTOM BRACKET BACK COVER SCREW PTP 4x40BP ...

Page 21: ...WIRING DIAGRAM 7 P902 Signal Cable G2 P302 P304 PW402 AC Socket s s PW501 P501 PW402A FBT P301 GND1 W1W2 ...

Page 22: ......

Page 23: ...01 Mode Control DPMS High Voltage Generation Circuit Secondary Rectifier Circuit D D Converter Transformer T903 Primary Rectifier Circuit Switching Control Circuit KA3842B IC901 7N60A Q901 CRT Focus H V SYNC E V H L N Screen Anode R G B DDC R G B R G B PC Horizontal Vertical Drive Circuit KB2511 IC701 Q301 Q302 Q303 Q304 Q311 Q312 Q313 Q314 Q321 Q322 Q323 Q324 FBT ...

Page 24: ...eed to operating of horizontal and vertical drive circuit DDC2B Plug Play and DPM energy saviing funtion DDC2B Plug Play function is operated by combination of H V Sync and SDA SCL signal 7 Horizontal and Vertical Drive Circuit This circuit take function that are H V position H V size side pincushion and trapezoid with the output of microprocessor circuit The generated vertical signal is applied t...

Page 25: ... RASTER PROCEDURE FOLLOW NO VERTICAL DEFLECTION PROCEDURE FOLLOW NO CHARACTER NO CONTRAST PROCEDURE FOLLOW OTHER PROCEDURES CHECK SMPS SECONDARY B OUTPUT CHECK HORIZONTAL OUTPUT WAVEFORM CHECK VERTICAL OUTPUT WAVEFORM CHECK VIDEO OUTPUT WAVEFORM NO YES YES YES YES NO NO NO ...

Page 26: ...D921 D922 D924 D928 OR THEIR CONNECTED COMPONENTS TROUBLE IN Q904 Q905 Q914 CIRCUIT TROUBLE IN OTHER PRIMARY CIRCUIT TROUBLE IN D906 D907 R906 CHECK C905 DC VOLTAGE CHECK IC901 CHECK T901 PIN 4 CHECK SMPS SECONDARY DC VOLTAGE CHECK Q914 EMITTER VOLTAGE 5V NO YES YES YES YES YES NO NO NO NO 6 3V 14V 55V 76V DC MORE THAN 130V ...

Page 27: ...TROUBLE IN IC302 12V LINE TROUBLE IN PC SIGNAL C311 C331 C351 TROUBLE IN IC301 CIRCUIT TROUBLE IN IC301 CIRCUIT TROUBLE IN VR302 VR312 VR322 VIDEO OUTPUT Q301 Q304 Q311 Q314 Q321 Q324 TROUBLE IN CDT SOCKET NO YES NO NO YES YES YES YES YES YES NORMAL 44 67V NO NO CHECK IC301 PIN 9 FOLLOW NO CONTRAST PROCEDURE NO 1 2v CHECK IC301 PIN 19 TROUBLE IN CLAMP CIRCUIT NO ...

Page 28: ...CHECK FBT PIN 3 DC 62 116V CHECK FBT PIN 2 TROUBLE IN HEATER VOLTAGE SUPPLY CIRCUIT Q904 Q905 Q914 TROUBLE IN G1 SUPPLY CIRCUIT D508 C636 Q509 Q510 ZD501 etc FOLLOW NO CHARACTER PROCEDURE FOLLOW NO POWER PROCEDURE CHECK HORIZONTAL DEFLECTION CIRCUIT CHECK MUTE OR DPM CIRCUIT NO NO YES YES YES YES YES NO NO NO 1 200VP P 1 000 ...

Page 29: ... 18 4 TROUBLE IN H V SIZE H V POSITION S PCC TRAPEZOID NO ADJUSTED H V SIZE POSITION S PCC TRAP CHECK IC401 PIN 17 18 19 20 30 TROUBLE IN IC401 MICOM TROUBLE IN SCL SDA CIRCUIT NO YES ...

Page 30: ...EFLECTION ONE HORIZONTAL LINE CHECK IC601 PIN 2 14V CHECK IC601 PIN 5 12V CHECK IC701 PIN 21 23 TROUBLE IN 14V LINE R612 C627 TROUBLE IN 12V LINE D515 R599 C538 TROUBLE IN IC701 TROUBLE IN IC601 V DEFLECTION CIRCUIT NO NO YES YES YES NO ...

Page 31: ... 20 6 NO CONTRAST NO CONTRAST CHECK Q512 CHECK IC301 PIN 9 TROUBLE IN Q512 TROUBLE IN PW501 P302 TROUBLE IN IC301 NO YES DC 0 8 5V YES NO ...

Page 32: ... 8 WAVEFORM 4MHz CHECK IC401 PIN 32 33 CHECK B LINE 6 3V 14V CHECK PC PC IS NOT GOING INTO DPM OFF MODE TROUBLE IN X401 IC401 MICOM TROUBLE IN IC401 MICOM TROUBLE IN B LINE TROUBLE IN PC OFF MODE FAILURE NO H V SYNC SIGNAL INPUT H V SYNC NO OFF MODE NO NO NO YES YES YES ...

Page 33: ...ING CHECK Q916 CHECK Q916 COLLECTOR VOLTAGE CHECK P902 CHECK RL901 TROUBLE IN Q916 IC401 TROUBLE IN Q916 RL901 TROUBLE IN P902 TROUBLE IN RL901 TROUBLE IN TH902 DEGAUSSING COIL NO DEGAUSSING NO NO NO NO YES YES YES YES ...

Page 34: ...e monitor to 195 1mm 6 Adjust vertical position with V POSI in the alignment program or buttons on the monitor to center of the screen 7 Adjust side pincushion with S PCC in the alignment program or buttons on the monitor to be the best condition 8 Adjust trapezoid with TRAPEZOID in the alignment program or buttons on the monitor to be the best condition 9 Display from Mode 2 to Mode 5 and repeat ...

Page 35: ...ower LED ST Switch Power Select Switch 110V 220V Control Line N o t u s e d R S 2 3 2 C P A R A L L E L V S Y N C P O W E R S T VGS MONITOR E E V Sync On Off Switch Switch must be ON F F A A B B C C 15 10 5 5 6 9 1 1 1 14 13 25 6 5V 5V 5V 4 7K 4 7K 4 7K 74LS06 74LS06 OFF ON OFF ON 11 Figure 1 CABLE CONNECTION ...

Page 36: ...JUSTMENT 1 2 3 8 9 FBT MAIN 4 5 6 7 16 15 VIDEO 17 13 12 14 10 11 No 1 2 3 4 5 6 7 8 9 No 10 11 12 13 14 15 16 17 Ref No SW401 VR701 VR501 SW404 SW403 SW402 SW401 VR502 VR901 Ref No VR801 VR503 VR301 VR311 VR321 VR322 VR312 VR302 Control Function HIGH VOLTAGE ADJUSTMENT ABL ADJUSTMENT R DRIVE G DRIVE B DRIVE B BIAS R BIAS G BIAS ...

Page 37: ... 23 111 2 222 85 008 11 093 0 670 0 023 0 069 11 764 0 578 640 x 480 85Hz MODE 1 31 469 25 422 6 356 0 636 3 813 31 778 1 907 59 940 15 253 1 430 0 318 0 064 16 683 1 048 640 x 480 60Hz MODE 3 31 470 25 420 6 360 0 640 3 810 31 780 1 910 70 080 12 710 1 557 0 413 0 064 14 270 1 080 720 x 400 70Hz MODE 5 53 674 14 222 4 409 0 569 1 138 18 631 2 702 85 061 11 179 0 578 0 019 0 056 11 756 0 503 800 x...

Page 38: ... Total Chassis Assembly 4 VIDEO BOARD ASSEMBLY REMOVAL 1 Remove three pins a 2 Remove CDT earth connector b 3 Carefully separate the Video Board Assembly from the CDT neck 4 Discharge the remaining static electricity by shorting between the Anode Cap and the CDT ground 5 Disconnect the Anode Cap from the CDT Anode Cap a a a a b a CDT Assembly a a Main Bracket 1 TILT SWIVEL REMOVAL 1 Set the monito...

Page 39: ...Remove three screws a 2 Remove the Bottom Bracket 6 MAIN BOARD ASSEMBLY REMOVAL 1 Remove three screws a 2 Remove five screws b 3 Release four latches c from the Main Board Assembly a a a Bottom Bracket c c b b b a Main PCB Assembly ...

Page 40: ... 25 3 VIDEO BOARD Component Side 4 VIDEO BOARD Solder Side ...

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