LG 901B Service Manual Download Page 1

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COLOR MONITOR

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

MENU

SELECT

MODEL: 901B

(CS992G-EL)

CHASSIS NO. : CA-123

FACTORY MODEL: CS992G

Summary of Contents for 901B

Page 1: ...COLOR MONITOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MENU SELECT MODEL 901B CS992G EL CHASSIS NO CA 123 FACTORY MODEL CS992G ...

Page 2: ...Size 350 x 262 mm 12 20 x 9 06 4 2 Display Color Full Colors 4 3 Display Resolution 1600 Dots x 1200Lines 4 4 Video Bandwidth 203MHz 5 ENVIRONMENT 5 1 Operating Temperature 0 C 40 C 32 F 103 F Ambient 5 2 Relative Humidity 8 80 Non condensing 5 3 Altitude 10 000 ft 6 DIMENSIONS with TILT SWIVEL Width 448 mm 17 64 Depth 470 mm 18 50 Height 454 mm 17 87 7 WEIGHT with TILT SWIVEL Net Weight 19 0 kg 4...

Page 3: ...ed per the original design Soldering must be inspected for the cold solder joints frayed leads damaged insulation solder splashes or the sharp points Be sure to remove all foreign materials IMPLOSION PROTECTION All used display tubes are equipped with an integral implosion protection system but care should be taken to avoid damage and scratching during installation Use only same type display tubes...

Page 4: ...768 85Hz Yes MODE 4 91 146 10 971 8 127 2 844 0 406 1 016 1 422 85 024 11 762 11 235 0 527 0 011 0 033 0 483 1280 X 1024 85Hz Yes MODE 5 93 750 10 666 7 901 2 765 0 316 0 948 1 501 75 000 13 333 12 800 0 533 0 011 0 032 0 490 1600 X 1200 75Hz MARK A B C D E F A B C D E F MODE FACTORY PRESET MODE Resolution Recall H O R I Z O N T A L V E R T I C A L Sync Polarity Frequency Total Period Video Active...

Page 5: ... indicator lights up green when the monitor operates normally in DPMS Energy Saving mode stand by suspend or power off mode its color changes to orange and if abnormal or damaging circuit turns out orange blink 3 Select Button Use this button to enter a selection in the on screen display 4 Button Use these buttons to choose or adjust items in the on screen display 5 MENU Button Use this button to ...

Page 6: ...CONTROL LOCATIONS 6 VR801 High Voltage Adjustment 26kV VR901 B Adjustment 190V Line ...

Page 7: ...WIRING DIAGRAM 7 DY Pin Degaussing Coil P702 P402 P401 P901 DY Assembly Screw P801 P201 Control PCB Anode Cap P451 SELECT ...

Page 8: ... 9mm C Height 12 0mm 1 TILT SWIVEL BACK COVER REMOVAL 1 Set the monitor face downward 2 Pull the latch a carefully remove the Tilt Swivel by pulling it upward 3 Pressing the latch b Back cover by pushing it upward 4 Release the latch c 5 Slide the Back Cover away from the Front Cabinet of the monitor ...

Page 9: ...BLOCK DIAGRAM 9 SIGNAL INPUT ...

Page 10: ...sists of Q913 and Q915 becomes stand by and suspend mode It s power consumption is below 8W When no horizontal and vertical sync signal input it s power consumption is below 3W 5 X ray Protection This circuit detects the rectified DC voltage comes from the FBT pin 4 If the high voltage of the FBT reaches up to about 30kV abnormal state H V control IC802 detects It stops B voltage supplied to the F...

Page 11: ...rabola wave from the TDA4841 IC801 and amplifies these waves to offer to the FBT T701 18 H V Blanking and Brightness Control This circuit eliminates the retrace line by supplying a negative pulse to the G1 of the CDT The brightness control circuit is used to control of the screen brightness by changing the DC level of G1 19 Image Rotation Tilt Circuit This circuit corrects the tilt of the screen b...

Page 12: ...command Caution Do not run this procedure unless the EEPROM is changed All data in EEPROM mode data and color data will be erased 4 COMMAND PRESET START Y Yes command 5 DIST ADJ FOS ADJ command 6 Adjust H POSITION as arrow keys to center of the screen 7 Adjust H SIZE as arrow keys to 350 2mm 8 Adjust V POSITION as arrow keys to center of the screen 9 Adjust V SIZE as arrow keys to 262 2mm 10 Adjus...

Page 13: ...mode 4 17 Adjust SUB CONTRAST command to 47 1FL of the raster luminance 18 Display color 15 0 full white patten at Mode 4 19 COLOR ADJ LUMINANCE ABL command 20 Adjust ABL to 32 1FL of the luminance 21 Exit from the program 5 Input EDID Data 1 Display color 15 0 cross hatch pattern at Mode 4 2 EEPROM Write EDID command and confirm EDID Write OK message of monitor 3 Exit from the alignment program 4...

Page 14: ... D901 TROUBLE IN FUSE F901 TROUBLE IN IC901 CHECK FUSE OK CHECK D901 BRIDGE DIODE NO YES YES NO NO CHECK C905 VOLTAGE 145VDC at 110V input 310VDC at 220V input TROUBLE IN D924 D926 D923 D922 D921 D920 TROUBLE IN Q912 Q913 Q915 Q914 IC905 IC904 YES NO CHECK D924 D926 D923 D922 D921 D920 YES ...

Page 15: ...02 PIN 18 19 20 PIN 9 5V CHECK IC303 PIN 1 3 5 PIN10 12V PIN 6 80V TROUBLE IN P301 SIGNAL CABLE PC SIGNAL TROUBLE IN IC302 P302 TROUBLE IN IC303 TROUBLE IN CDT SOCKET NO YES NO NO YES YES CHECK R G B CATHODE VOLTAGE TROUBLE IN IC304 NO YES NO CHARACTER ...

Page 16: ... AT D924 D926 CATHODE 190V D923 CATHODE 80V IC904 OUT 12V D921 CATHODE 6 3V CHECK IC401 MICOM PIN 6 5V HIGH IC801 PIN 10 12V HIGH ROTATE SCREEN CONTROL KNOB TO CLOCKWISE TROUBLE IN IC401 MICOM IC801 TROUBLE IN CDT SOCKET BOARD TROUBLE IN PRIMARY CIRCUIT OF T901 TROUBLE IN P302 SIGNAL CABLE AMBER MIN Counter clockwise GREEN OK YES NO YES NO ...

Page 17: ... NO V DEFLECTION ONE HORIZONTAL LINE CHECK IC601 Pin 3 15V CHECK IC601 PIN 7 47V TROUBLE IN T901 PIN 18 TROUBLE IN T801 PIN 4 IC904 TROUBLE IN IC601 V CIRCUIT NO NO YES YES CHECK IC801 PIN 13 SAWTOOTH WAVE TROUBLE IN IC801 NO YES ...

Page 18: ...TO DPM MODE TROUBLE IN X401 IC401 TROUBLE IN IC401 TROUBLE IN IC401 TROUBLE IN T901 or PC NO H V SYNC SIGNAL INPUT H V SYNC NO NO NO DPMS TABLE Mode Item NORMAL STAND BY SUSPEND OFF H V SYNC ON ON OFF ON ON OFF OFF OFF LED GREEN AMBER AMBER AMBER VIDEO NORMAL OFF 0V OFF 0V OFF 0V YES YES CHECK B LINE 15V 6 3V TROUBLE IN Q913 Q915 NO YES STAND BY SUSPEND OFF MODE FAILURE ...

Page 19: ...HECK IC401 PIN 6 5V CHECK Q920 COLLECTOR VOLTAGE 0 5V CHECK P901 CHECK RL901 TROUBLE IN IC401 MICOM TROUBLE IN D925 TROUBLE IN P901 TROUBLE IN RL901 TROUBLE IN TH901 DEGAUSSING COIL NO DEGAUSSING NO NO NO NO YES YES YES YES ...

Page 20: ...MES IN CHECK IC301 PIN 10 V PULSE COMES IN CHECK IC301 PIN 13 14 15 IS THERE ANY SIGNAL WHEN OPERATING FRONT CONTROL NO OSD TROUBLE IN IC302 TROUBLE IN P302 TROUBLE IN P302 TROUBLE IN IC301 IC401 YES YES YES NO NO NO CHECK IC301 PIN 4 5V TROUBLE IN P302 NO YES ...

Page 21: ... 21 EXPLODED VIEW C A B 1 14 15 12 12 11 10 9 8 7 3 4 13 6 5 2 SELE CT M E N U ...

Page 22: ...COVER ASSY CB997E TKC036 85964 PFC TILT SWIVEL ASSY CB997E TKT054 TKB048 85964 SCREW ASSY PHP 5 20 FZMY GW18 NEW TYPE COIL DEGAUSSING 1290MM 16 5OHM 0 45MM 115T 19 CB997E FBT FLY BACK TRANSFORMER FQM19A008 EB990G SAMSUNG 19 FILTER CIRC EMC 02MD1 DELTA BK W O GND CABLE D SUB UL 2990 9C 7 5 AT 1560MM GLAY CB777G DM METAL REAR CB997E METAL ASSY FRAME BOTTOM HOLDER PCB FIX PC ABS METAL SHIELD BOTTOM 9...

Page 23: ...0 1M 50V Z F TA52 C410 0CK1040K945 0 1UF 50V Z F TR C417 0CK1040K945 0 1UF 50V Z F TR C418 0CN1040K949 0 1M 50V Z F TA52 C452 0CE106CF638 10UF SHL SD 16V M FM5 TP 5 C453 0CE106CF638 10UF SHL SD 16V M FM5 TP 5 C454 0CK1040K945 0 1UF 50V Z F TR C455 0CK1040K945 0 1UF 50V Z F TR C459 0CK1010K515 100PF 50V K B TR C601 0CZZTFT001R ECQB1H223JM3 223J 50V TP5 0 MA C602 181 288B MKT 100V 104JTR PHS26104 C6...

Page 24: ...TEON GREEN D301 0DS141489AB 1N4148 TP GRANDE DO 34 500MW 1 D302 0DS141489AB 1N4148 TP GRANDE DO 34 500MW 1 D303 0DS141489AB 1N4148 TP GRANDE DO 34 500MW 1 D304 0DS141489AB 1N4148 TP GRANDE DO 34 500MW 1 D305 0DS141489AB 1N4148 TP GRANDE DO 34 500MW 1 D306 0DS141489AB 1N4148 TP GRANDE DO 34 500MW 1 D307 0DS124409AA 1SS244 TP ROHM KOREA D308 0DS124409AA 1SS244 TP ROHM KOREA D309 0DS124409AA 1SS244 T...

Page 25: ...05 0ISS780500F KA7805 L304 0LA1000K119 100UH K 2 3 3 4 TP DATE 2002 9 12 S AL LOC NO PART NO DESCRIPTION SPECIFICATION L305 0LA0390K119 0 39UH K 2 3 3 4 TP L306 0LA0390K119 0 39UH K 2 3 3 4 TP L307 0LA0390K119 0 39UH K 2 3 3 4 TP L308 971 0054 TIN 50MM TAPING L309 971 0054 TIN 50MM TAPING L310 971 0054 TIN 50MM TAPING L701 6140TBZ009C NO CORE 10UH 0 12 15MM 50 5T F L801 6140TYZ011B GET DR14 15 EB9...

Page 26: ...A52 R321 0RD1002Q609 10K 1 4W 3 5 TA52 R322 0RD1501Q609 1 50K 1 4W 3 5 TA52 R323 0RD1102Q609 11K 1 4W 3 5 TA52 R324 0RD1000Q609 100 1 4W 3 5 TA52 DATE 2002 9 12 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R325 0RD1002Q609 10K 1 4W 3 5 TA52 R326 0RD1000Q609 100 1 4W 3 5 TA52 R327 0RD2201Q609 2 20K 1 4W 3 5 TA52 R328 0RD2201Q609 2 20K 1 4W 3 5 TA52 R329 0RD2201Q609 2 20K 1 4W 3 5 TA52 R330 0RD1001...

Page 27: ...09 1K 1 4W 3 5 TA52 R809 0RN4702F409 47K 1 6W 1 TA52 R810 0RD1001Q609 1K 1 4W 3 5 TA52 R811 0RD1001Q609 1K 1 4W 3 5 TA52 DATE 2002 9 12 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R812 0RD2201Q609 2 20K 1 4W 3 5 TA52 R813 0RD2401Q609 2 40K 1 4W 3 5 TA52 R814 0RN1202F409 12K 1 6W 1 TA52 R818 0RD2701Q609 2 70K 1 4W 3 5 TA52 R822 0RN3601F409 3 6K 1 6W 1 TA52 R823 0RD2703Q609 270K 1 4W 3 5 TA52 R824...

Page 28: ...3M DC12V DONGYANG 250VAC 5A SC301 6620TBD003A PCS701E PARK ELEC 10PIN 14 36 SC901 6200TJB001H 02MD1 DELTA BK W O GND SG301 6918TAT005E MTAS 201M GIGA AXIAL TAPING SG302 165 004A AG20PT 152F L3N S 23 HANDOK RA SG303 6918TAT005E MTAS 201M GIGA AXIAL TAPING SG304 6918TAT005E MTAS 201M GIGA AXIAL TAPING SG305 6918TAT005E MTAS 201M GIGA AXIAL TAPING SG701 165 004A AG20PT 152F L3N S 23 HANDOK RA SW201 1...

Page 29: ...rminal of Under Voltage Protection Postive Input terminal of Buffer Amp Output terminal of Buffer Amp Postive Input terminal of OP Amp Negative Input terminal of OP Amp Output terminal of OP Amp Dead time control terminal Soft start function Output terminal of reference voltage 5V Ground terminal M62501P FP M62501 1 2 3 4 5 6 7 8 PWM OUT Vcc TIN Cosc Cagc POUT OVP UVP GND VREF DTC FB IN IN BO BI 1...

Page 30: ...IIC SCL DDC SDA DDC SCL 30 31 SCHEMATIC DIAGRAM NOTICE Since this is a basic schematic diagram The value of components and some partial connection are sucject to be changed for improvement without notice CS992G ...

Page 31: ... 32 33 PRINTED CIRCUIT BOARD 3 MAIN BOARD Component Side 4 MAIN BOARD Solder Side 1 CONTROL BOARD Component Side 2 CONTROL BOARD Solder Side ...

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