LG 17CD Service Manual Download Page 17 | Manualshive

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5. TROUBLE IN H-LINEARITY

UNBALANCED OF H-LIN.

CHECK

IC401

PIN 5, 6, 7 ?

CHECK

Q711~Q716?

CHECK

L703?

TROUBLE IN
IC401 (MICOM)

TROUBLE IN
Q711 ~ Q716

TROUBLE IN
L703

TROUBLE IN
C722, C723, C726, C729

NO

NO

NO

YES

YES

YES

Cs SIGNAL TABLE

HORIZONTAL

FREQUENCY(fH)

30K ~ 33.9K

34K ~ 38.9K

39K ~ 44.9K

45K ~ 48.9K

49K ~ 57.9K

58K ~ 65.9K

66K ~ 70K

Cs1

L

L

H

L

H

L

H

Cs3

L

L

L

H

H

H

H

Cs2

L

H

H

L

L

H

H

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Summary of Contents for 17CD

Page 1: ...http www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MENU SELECT MODEL StudioWorks 700S CB777G NA StudioWorks 700E CB777G AA StudioWorks 700B CB777G EA CHASSIS NO CA 109 FACTORY MODEL CB777G ID LABEL Model No ...

Page 2: ... x 245 5 mm 12 86 x 9 67 Preset Image Size 310 x 230 mm 12 20 x 9 06 4 2 Display Color Full Colors 4 3 Display Resolution 1280 x 1024 60Hz Max Non Interlace 4 4 Video Bandwidth 110 MHz 5 ENVIRONMENT 5 1 Operating Temperature 0 C 40 C Ambient 5 2 Relative Humidity 10 90 Non condensing 5 3 Altitude 5 000 m 6 DIMENSIONS with TILT SWIVEL Width 400 0 mm 15 74 inch Depth 420 0 mm 16 53 inch Height 395 0...

Page 3: ...sign 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 X RADIATION The only ...

Page 4: ...4 41 1 14 2 70 0 57 V 85 07 11 755 11 178 0 577 0 056 0 503 0 018 H 68 677 14 561 10 836 3 725 1 016 2 201 0 508 V 85 00 11 764 11 182 0 582 0 044 0 524 0 014 Mode H V Sort 1 2 3 4 Dot Clock MHz Horizontal Frequency kHz Vertical Frequency Hz Horizontal etc µs Vertical etc ms Sync Polarity Frequency Total Period E Video Active Time A Sync Duration D Blanking Time B Back Porch F Front Porch C 640x48...

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 e...

Page 6: ...WIRING DIAGRAM 6 P501 P201 P405 P301 P302 G2 P702 P701 T1 P402 P902 S S Signal Cable AC Socket FBT ...

Page 7: ...rd 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 2 TOTAL CHASSIS ASSEMBLY REMOVAL 1 Set the monitor face downward 2 Pressing the latch a Main Chassis by pushing it upward a a CDT Please be careful not to cut pattern ...

Page 8: ... Sig V Sync Sig I 2 C DATA SDA I 2 C CLOCK SCL VIDEO LM1269 PRE AMP IC302 Signal Cable R G B VIDEO LM2469 LM2480 CUT OFF IC IC304 MAIN AMP IC303 5V 5V H V Sync Processor IC701 TDA4857 V OUT IC601 TDA4866 H OUT Q706 H Linearity Correction DC DC Converter X RAY Protection Circuit FBT T701 Dynamic Focus Circuit Auto Beam Limit Vertical Blanking Brightness Control 160V 40V 400V STEP UP 15V D D Feed Ba...

Page 9: ...ts operating mode and offers the controlled data H size H position V size etc 4 The controlled data of each mode is stored in itself 5 User can adjust screen condition by each OSD function The data of the adjusted condition is stored in EEPROM IC402 6 Horizontal and Vertical Oscillation This circuit generates the horizontal pulse and the vertical pulse by taking the H and V sync signal This circui...

Page 10: ...e deflection yoke of the CRT 16 Video Pre Amp Circuit This circuit amplifies the analog video signal from 0 0 7V to 0 4V It is operated by taking the clamp R G B drive and contrast signal from the Micom IC401 17 Video Output Amp Circuit This circuit amplifies the video signal which comes from the video pre amp circuit and amplified it to applied the CRT cathode ...

Page 11: ...and color data will be erased 4 Power button of the monitor turn off turn on 5 COMMAND PRESET START Y Yes command 6 DIST ADJ CTRL PWM TILT command 7 Adjust tilt as arrow keys to be the best condition 8 DIST ADJ BALANCE command 9 Adjust parallelogram as arrow keys to be the best condition 10 Adjust balance of pin balance as arrow keys to be the best condition 11 DIST ADJ FOS ADJ command 12 Adjust V...

Page 12: ...Mode 4 20 Set Brightness and Contrast to Max position 21 COLOR ADJ LUMINANCE ABL command 22 Adjust ABL to 32 1FL of the luminance 23 After push the ENTER key and COMMAND PRESET EXIT Y Yes command 24 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 P...

Page 13: ... IN FUSE F901 TROUBLE IN IC901 TROUBLE IN D941 D942 D951 D961 D962 D971 TROUBLE IN Q903 Q952 Q951 Q942 Q941 CHECK FUSE OK CHECK C908 VOLTAGE AC120V 160VDC AC220V 304VDC NO YES YES YES YES NO NO NO CHECK IC901 PIN 6 WAVEFORM SQUARE WAVE COMES OUT CHECK D941 D942 D951 D961 D962 D971 VOLTAGE ...

Page 14: ...IN 1 2 3 CHECK IC303 PIN 4 80V PIN 8 12V TROUBLE IN P302 5V LINE TROUBLE IN PC SIGNAL P301 SIGNAL CABLE TROUBLE IN IC302 TROUBLE IN P303 12V LINE 80V LINE TROUBLE IN IC303 NO YES NO NO YES YES YES YES NO NO CHECK R G B CATHODE VOLTAGE TROUBLE IN R341 R343 R331 R333 L311 L313 D307 D312 TROUBLE IN CRT SOCKET YES NO ...

Page 15: ...CHECK POWER INDICATOR GREEN or AMBER CHECK D712 ANODE 157V CHECK G1 VOLTAGE 55V 150V TROUBLE IN D712 TROUBLE IN Q799 DPM MODE NO H and or V SYNC AMBER NO GREEN YES NO CHECK CDT HEAT VOLTAGE 6 3V TROUBLE IN D941 Q942 Q941 YES NO TROUBLE IN CDT YES ...

Page 16: ...E VERTICAL LINE CHECK Q706 CHECK B VOLTAGE 50V CHECK T701 FBT PIN 2 31KHZ 60V 69KHZ 140V CHECK Q701 COLLECTOR WAVEFORM TROUBLE IN Q706 TROUBLE IN 50V LINE TROUBLE IN Q719 Q720 D710 TROUBLE IN Q701 TROUBLE IN T701 P701 NO NO YES YES YES YES NO NO 0V T ...

Page 17: ...6 CHECK L703 TROUBLE IN IC401 MICOM TROUBLE IN Q711 Q716 TROUBLE IN L703 TROUBLE IN C722 C723 C726 C729 NO NO NO YES YES YES Cs SIGNAL TABLE HORIZONTAL FREQUENCY fH 30K 33 9K 34K 38 9K 39K 44 9K 45K 48 9K 49K 57 9K 58K 65 9K 66K 70K Cs1 L L H L H L H Cs3 L L L H H H H Cs2 L H H L L H H ...

Page 18: ...FLECTION ONE HORIZONTAL LINE CHECK IC601 PIN 3 15V CHECK IC601 PIN 7 40V CHECK IC701 PIN 12 13 TROUBLE IN R603 15V LINE TROUBLE IN HIGH VOLTAGE OUT CIRCUIT FBT D721 R606 TROUBLE IN IC701 TROUBLE IN IC601 V CIRCUIT NO NO YES YES YES NO 3V ...

Page 19: ...OUBLE IN IC601 PIN8 V FBP T701 40V LINE H FBP TROUBLE IN IC302 IC301 TROUBLE IN IC301 IC302 NO YES DC 5V YES YES YES NO NO NO Pin 5 5V Pin 10 5V H V 5V H V CHECK IC301 B 5V CHECK IC301 PIN 12 WAVEFORM ENTER BUTTON MUST BE PRESSED CHECK IC301 PIN 5 10 WAVEFORM CHECK IC301 PIN 13 14 15 ...

Page 20: ...CHECK PC PC IS NOT GOING INTO DPM OFF MODE TROUBLE IN X401 TROUBLE IN IC401 MICOM TROUBLE IN Q941 Q942 Q951 Q952 TROUBLE IN PC OFF MODE FAILURE INPUT H V SYNC SIGNAL H V SYNC NO OFF MODE NO NO NO NO DPMF 0V DPM TABLE Mode Item NORMAL STAND BY SUSPEND OFF DPMF H H H L LED GREEN AMBER AMBER AMBER DPMS H L L L YES YES SEE DPM TABLE YES YES 5V 24MHz ...

Page 21: ...HECK Q953 COLLECTOR VOLTAGE CHECK P902 CHECK RL901 TROUBLE IN IC401 MICOM TROUBLE IN Q953 TROUBLE IN P902 TROUBLE IN RL901 TROUBLE IN TH901 DEGAUSSING COIL NO DEGAUSSING DC 15V NO NO NO NO YES YES YES YES DEGAUSS ON THE OSD MENU MUST BE PRESSED ...

Page 22: ...NO TILT NO ROTATION TROUBLE IN IC401 MICOM TROUBLE IN 15V LINE 6 3V LINE TROUBLE IN Q501 Q503 TROUBLE IN P501 TILT COIL D501 NO YES YES YES CHECK 15V LINE AND 6 3V LINE CHECK Q503 EMITTER VOLTAGE NO NO CHECK IC401 PIN21 WAVE FORM ...

Page 23: ...EXPLODED VIEW 8 B A 2 1 4 3 12 12 13 6 7 5 11 13 M E N U S E L E C T 10 9 a b c 23 ...

Page 24: ...CB ASSEMBLY SUB CB777G KQLBMS CONTROL TOTAL BRAND CA 112 For Brazil S W 700S CB777G NA PWB PCB ASSEMBLY SUB CB777G CONTROL TOTAL BRAND KQIDML For India S W 700S CB777G NA METAL SHIELD BOTTOM A CKD HOLDER PCB FIX PC ABS BRACKET CB777F SUPPORTER CDT MAIN TOTAL ASSEMBLY CB777G KXLVMD BRAND CA 109 S W 700S CB777G NA MAIN TOTAL ASSEMBLY CB777G BRAND CA 109 For Europe U K Russia S W 700B CB777G EA MAIN ...

Page 25: ...5 100PF 50V K B TR C408 0CK1040K945 0 1UF 50V Z F TR C409 0CC5600K415 56P 50V J NP0 TP C410 0CK1010K515 100PF 50V K B TR C411 0CK1040K945 0 1UF 50V Z F TR C412 0CK1040K945 0 1UF 50V Z F TR C413 0CK1040K945 0 1UF 50V Z F TR C501 0CE106CF638 10UF SHL SD 16V M FM5 TP 5 C599 0CE225CK638 2 2UF SHL SD 50V M FM5 TP 5 C601 0CE477EH618 470UF KMG 25V M FL TP 5 C602 181 288B MKT 100V 104JTR PHS26104 C603 0CE...

Page 26: ...O PART NO DESCRIPTION SPECIFICATION D701 0DS141489AB 1N4148 TP GRANDE DO 34 500M D702 0DS141489AB 1N4148 TP GRANDE DO 34 500M D704 0DR150051AA DMV1500M F5 ST SGS THOMSON D705 0DR100009CA RGP10G TP GULF SEMICONDUCTO D706 0DR359150AA BY359F 1500 BK PHILIPS SO D709 0DR400409AB UF4004 TP G I DO204AL 400V D710 0DR320400AA S3L20U 4004P15 BK SHINDENGE D711 0DS141489AB 1N4148 TP GRANDE DO 34 500M D712 0DR...

Page 27: ...4 TP SAMSUNG Q711 0TF630000CA IRFS630A BK SAMSUNG 200V 6 Q712 0TF630000CA IRFS630A BK SAMSUNG 200V 6 Q713 0TF630000CA IRFS630A BK SAMSUNG 200V 6 Q714 0TR319809AA KTC3198 Y KTC1815 TP KEC T DATE 2002 01 23 S AL LOC NO PART NO DESCRIPTION SPECIFICATION Q715 0TR319809AA KTC3198 Y KTC1815 TP KEC T Q716 0TR319809AA KTC3198 Y KTC1815 TP KEC T Q719 0TF630000CA IRFS630A BK SAMSUNG 200V 6 Q720 0TR390409CA ...

Page 28: ...2202Q609 22K 1 4W 3 5 TA52 R710 0RD1000Q609 100 1 4W 3 5 TA52 DATE 2002 01 23 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R711 0RD1000Q609 100 1 4W 3 5 TA52 R712 0RD1001Q609 1K 1 4W 3 5 TA52 R713 0RD1000Q609 100 1 4W 3 5 TA52 R714 0RN1501F409 1 5K 1 6W 1 TA52 R714 1 0RN3001F409 3K 1 6W 1 TA52 R714 2 0RN6200F409 620 1 6W 1 TA52 R715 0RD2702Q509 27K OHM 1 4 W 3 4 2 TA52 R716 0RD7502Q609 75K 1 4W 3...

Page 29: ...Q609 4 70K 1 4W 3 5 TA52 R956 0RD4702Q609 47K 1 4W 3 5 TA52 R957 0RD0472A609 47 OHM 1 2 W 7 0 5 TA52 R960 0RD2200A609 220 OHM 1 2 W 7 0 5 TA52 R967 971 0054 TIN 50MM TAPING F1 430 858C AFC 520 BAE EUN TA F2 430 858C AFC 520 BAE EUN TA F901 0FZZTTH001D TIME LAG HBC 3 15A 250V 215 J27 0RD0471Q609 4 70 1 4W 3 5 TA52 J59 0RD1000Q609 100 1 4W 3 5 TA52 J99 0RD3302Q609 33K 1 4W 3 5 TA52 RL901 6920TBA001A...

Page 30: ...h1 Vth2 O S C ERROR AMP GND O C P F B S D REG STR G8644D Block Diagram 1 2 3 4 5 6 7 8 9 V 3 GND IN V 3 OUT V 2 OUT V 1 OUT V 2 IN V 1 IN VCC VBB LM2469 Monolothic Triple 9nS high Gain CRT Driver Connection Diagram 1 9 M24C08 Serial I2C BUS EEPROM SYMBOL E0 E2 SDA SCL WC Vcc Vss DESCRIPTION Chip Enable Input Serial Data Address Input Output Serial Clock Write Control Supply Voltage Ground 1 PSDIP8...

Page 31: ...l Output 1 Descending Sawtooth Vertical Synchronization Input Horizontal Composite Synchronization Input Video Clamping Pulse V Blanking Output PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SYMBOL HUNLOCK SCL SDA i c VSMOD VAGC VREF VCAP SGND HPLL1 HBUF HREF HCAP HPLL 2 HSMOD FOCUS DESCRIPTION H Synchronization Unlock Protection V Blanking Output I2C Bus Clock Input I2C Bus Data Input Internally conn...

Page 32: ...DA IIC SCL DDC SDA DDC SCL 32 33 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 ...

Page 33: ... 34 35 PRINTED CIRCUIT BOARD 3 MAIN BOARD Component Side 4 MAIN BOARD Solder Side 1 CONTROL BOARD Component Side 2 CONTROL BOARD Solder Side ...

Page 34: ...Feb 2002 P NO 3828TSL080A Printed in Korea ...

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