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LG 177V Service Manual
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LG 177V Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CA-109
FACTORY MODEL: CS778G
MODEL: 177V
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MENU
SELECT

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Summary of Contents for LG 177V

  • Page 1: Color Monitor

    COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-109 FACTORY MODEL: CS778G MODEL: 177V CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. MENU SELECT...

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 DESCRIPTION OF BLOCK DIAGRAM.....9 ADJUSTMENT ............11 SAFETY PRECAUTIONS ........3 TROUBLESHOOTING GUIDE ......13 TIMING CHART ............4 EXPLODED VIEW........... 23 OPERATING INSTRUCTIONS ........ 5 REPLACEMENT PARTS LIST ....... 25 WIRING DIAGRAM ..........6 PIN CONFIGURATION...........

  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS SAFETY-RELATED COMPONENT WARNING! X-RADIATION There are special components used in this color monitor The only potential source of X-radiation is the picture tube. which are important for safety. These parts are marked However, when the high voltage circuitry is operating on the schematic diagram and the replacement properly there is no possibility of an X-radiation problem.

  • Page 4: Timing Chart

    TIMING CHART VIDEO SYNC FACTORY PRESET MODE MODE MARK MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7 MODE 8 MODE 9 MODE 10 MODE 11 — — — — — Sync Polarity 31.472 31.469 37.50 43.269 46.875...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW ID Label MENU SELECT Power ON/OFF Button AC Power Socket See Front Control Panel Signal Connector Front Control Panel MENU SELECT Button 1. Power ON/OFF Button Use these buttons to choose or adjust items in the on Use this button to turn the monitor ON or OFF.

  • Page 7: Disassembly

    DISASSEMBLY 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 8: Block Diagram

    < OSD Control > SELECT Heater ( 6.3V ) Signal H-Sync Sig POWER Cable VIDEO ON/OFF V-Sync Sig VIDEO PRE-AMP MAIN AMP C DATA(SDA) (IC302) (IC303) BRIGHTNESS LM1269 C CLOCK(SCL) CONTRAST LM2467 H / V POSITION H / V SIZE OSD IC MICOM SPCC...

  • Page 9: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Line Filter & Associated Circuit. 3) The Micom sets operating mode and offers the This is used for suppressing noise of power input line controlled data. (H-size, H-position, V-size, ... etc.) flowing into the monitor and/or some noise generated in 4) The controlled data of each mode is stored in itself.
  • Page 10 15. H & V Blanking and Brightness Control. 18. OSD Circuit Blanking circuit eliminates retrace line by supplying This circuit is used for performing the OSD(On-Screen- negative pulse to the G1 of the CRT. And Brightness Display) function. circuit is used for control of the screen brightness by When a user selects the OSD Select/Adjustment control, changing DC level of the G1.

  • Page 11: Adjustment

    ADJUSTMENT GENERAL INFORMATION All adjustment are thoroughly checked and corrected 7) Adjust balance of Pin-Balance and Parallelogram when the monitor leaves the factory, but sometimes correction as arrow keys to be the best condition. 8) DIST. ADJ. → FOS. ADJ command. several adjustments may be required.
  • Page 12 15) Save in COLOR 1. 6. Special PRESET Mode Adjustment Method with 16) Display color 15,0 full white patten at Mode 8. OSD control. 17) COLOR ADJ. → LUMINANCE → ABL command. Service man can adjust preset modes data easily by 18) Adjust ABL to 32 ±...

  • Page 13: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK TROUBLE IN FUSE FUSE OK? (F901) CHECK C908 VOLTAGE? TROUBLE IN (AC120V: 160VDC, D900 AC220V: 304VDC) CHECK IC901 PIN 5 TROUBLE IN WAVEFORM (SQUARE WAVE IC901 COMES OUT?) CHECK TROUBLE IN D941, D942, D951, D961, D941, D942, D951,...
  • Page 14 2. NO CHARACTER NO CHARACTER CHECK TROUBLE IN IC302 P302 5V LINE PIN 9(5V) ? TROUBLE IN CHECK PC SIGNAL, IC302 PIN 5, 6, 7? P301 SIGNAL CABLE CHECK TROUBLE IN IC302 PIN 20, 19, 18 ? IC302 CHECK TROUBLE IN IC303 PIN 4 (80V) P302 PIN 15(80V), PIN 8 (12V) ?
  • Page 15 3. NO RASTER NO VIDEO (POWER INDICATOR ON) CHECK AMBER DPM MODE POWER INDICATOR (NO H and/or V SYNC) GREEN or AMBER? GREEN CHECK TROUBLE IN D712 ANODE D712 (-157V)? CHECK TROUBLE IN G1 VOLTAGE? Q799 (-55V~-150V) CHECK TROUBLE IN CDT HEAT D941, Q942, Q941 VOLTAGE? (6.3V)

  • Page 16: No Horizontal Deflection

    4. NO HORIZONTAL DEFLECTION NO H-DEFLECTION (ONE VERTICAL LINE) CHECK TROUBLE IN Q706? Q706 CHECK TROUBLE IN B + VOLTAGE 50V LINE (50V)? CHECK T701(FBT) PIN 2 TROUBLE IN (31KHZ 60V, Q719, Q720, D710 69KHZ 140V) ? CHECK TROUBLE IN Q701 COLLECTOR Q701 WAVEFORM?

  • Page 17: Trouble In H-Linearity

    5. TROUBLE IN H-LINEARITY UNBALANCED OF H-LIN. CHECK TROUBLE IN IC401 IC401 (MICOM) PIN 5, 6, 7 ? CHECK TROUBLE IN Q711~Q716? Q711 ~ Q716 CHECK TROUBLE IN L703? L703 Cs SIGNAL TABLE HORIZONTAL FREQUENCY(fH) TROUBLE IN 30kHz Hf < 35kHz C722, C723, C726, C729 35kHz Hf <...

  • Page 18: No Vertical Deflection

    6. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 PIN 3 R603 15V LINE (15V)? TROUBLE IN CHECK HIGH-VOLTAGE OUT IC601 PIN 7 CIRCUIT(FBT), (40V)? D721, R606 CHECK TROUBLE IN IC701 PIN 12, 13? IC701 TROUBLE IN IC601, V-CIRCUIT...
  • Page 19 7. TROUBLE IN OSD (ENTER BUTTON MUST BE PRESSED.) NO OSD CHECK TROUBLE IN IC301 B + 5V LINE (5V) ? DC 5V CHECK TROUBLE IN IC301 PIN 5, 10 IC601 PIN8 (V-FBP), WAVEFORM? IC701 PIN1 (H-FBP) Pin 10 Pin 5 CHECK TROUBLE IN IC301 PIN 12...
  • Page 20 8. TROUBLE IN DPM (NO OFF MODE.) OFF MODE FAILURE CHECK CHECK PC, IC401 (MICOM) INPUT H/V SYNC SIGNAL (PC IS NOT GOING INTO PIN 30, 31 (H/V INPUT) DPM OFF MODE) SIGNAL? H/V SYNC CHECK TROUBLE IN IC401 PIN 13 X401 WAVEFORM? 24MHz...

  • Page 21: No Degaussing

    9. NO DEGAUSSING NO DEGAUSSING (DEGAUSS ON THE OSD MENU MUST BE PRESSED.) CHECK TROUBLE IN IC401 PIN 19 IC401 (MICOM) (0V)? CHECK TROUBLE IN Q953 COLLECTOR Q953 VOLTAGE? DC 15V CHECK TROUBLE IN P902 ? P902 CHECK TROUBLE IN RL901? RL901 TROUBLE IN...
  • Page 22 10. NO TILT (NO ROTATION ) NO TILT (NO ROTATION) CHECK TROUBLE IN IC401 PIN21 IC401 ( MI COM) WAVE FORM ? CHECK 15V LINE TROUBLE IN 15V LINE, 6.3V LINE AND 6.3V LINE ? CHECK TROUBLE IN Q503 COLLECTOR Q501~Q503 VOLTAGE (15V) ?

  • Page 23: Exploded View

    EXPLODED VIEW...

  • Page 24: Exploded View Parts List

    Ref. No. CABINET ASSEMBLY, CS778G FUJITSU SIMENS 067 PC+ABS ID31 LOCAL 3091TKC073L 2423GC5E93A CDT(CIRC), M41LFQ903X 72NLLD LG-PHILIPS Displays 70KHZ 29.1 m 3809TKC035Q BACK COVER ASSEMBLY, CS778G C035 FSC PC+ABS ID31 LOCAL TILT SWIVEL ASSEMBLY, CS778G T053/B046 60HR 14966 WA LOCAL 3043TKK074E SCREW ASS’Y, PHP+5*20(FZMY)+GW18 NEW TYPE...

  • Page 25: Replacement Parts List

    REPLACEMENT PARTS LIST CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL. * NOTE SAFETY Mark AL ALTERNATIVE PARTS DATE: 2002. 02. 18. DATE: 2002. 02. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 26 DATE: 2002. 02. 18. DATE: 2002. 02. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C749 0CE2256R638 2.2000UF SMS 250V M FM5 TP5 D402 971-0054 TIN 50MM TAPING C750 0CK1040K945 0.1UF 50V Z F TR D512...
  • Page 27 DATE: 2002. 02. 18. DATE: 2002. 02. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q712 0TF630000CA IRFS630A BK SAMSUNG 200V 6. IC301 0IPRPMJ008A MTV038N-15EG MYSON 16P DIP Q713 0TF630000CA IRFS630A BK SAMSUNG 200V 6.
  • Page 28 DATE: 2002. 02. 18. DATE: 2002. 02. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R329 0RD1001Q609 1K 1/4W(3 5% TA52 R610 0RD1101Q609 1.1K OHM 1/4 W (3.4) 5% TA5 R330 0RD1000Q609 100 1/4W(3 5% TA52...
  • Page 29 SW207 140-058D SKHV10911A LGEC NON 12 20 H R806 0RD4702Q609 47K 1/4W(3 5% TA52 T701 6174T11003E “1054A,CB777G LG-PHILIPS 17””” R808 0RD6802Q609 68K 1/4W(3 5% TA52 T702 6170TCZ006A EE2218 2.3 MH D/FOCUS(CB775 R809 0RMZTWD001G RWR SMART 1OHM 5 W 5% PD TY...

  • Page 30: Pin Configuration

    PIN CONFIGURATION TDA4866J Current Driven Vertical Deflection Booster SYMBOL OUTB TDA4866J OUTB OUTA V FB GUARD OUTA FEEDB GUARD FEEDB Pin Configuration M24C08 Serial I C BUS EEPROM SYMBOL DESCRIPTION PSDIP8 (BN) 0.25mm Frame E0-E2 Chip Enable Input Serial Data Address Input/Output Serial Clock Write Control SO8 (MN)
  • Page 31 TDA4857 Autosync Deflection Controller HFLB FOCUS XRAY HSMOD HPLL2 BSENS HCAP HREF BDRV HBUF PGND HPLL1 HDRV SGND TDA4857 XSEL VCAP VREF EWDRV VAGC VOUT2 VSMOD VOUT1 VSYNC HSYNC CLBL HUNLOCK Pin Configuration SYMBOL DESCRIPTION SYMBOL DESCRIPTION Horizontal Flyback Input H-Synchronization Unlock/Protection/V-Blanking Output HFLB HUNLOCK...

  • Page 32: Schematic Diagram

    IIC-SDA IIC-SCL DDC-SDA DDC-SCL...
  • Page 33 3. MAIN BOARD (Component Side) 4. MAIN BOARD (Solder Side)

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