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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CA-113
FACTORY MODEL: FB775G
MODEL:
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
775FT
(FB775G-EA)

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   Summary of Contents for LG Flatron 775FT

  • Page 1: Color Monitor

    COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-113 FACTORY MODEL: FB775G MODEL: 775FT (FB775G-EA) CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 ADJUSTMENT ............10 SAFETY PRECAUTIONS ........3 TROUBLESHOOTING GUIDE ......12 TIMING CHART ............4 EXPLODED VIEW........... 22 OPERATING INSTRUCTIONS ........ 5 REPLACEMENT PARTS LIST ....... 24 WIRING DIAGRAM ..........6 PIN CONFIGURATION........... 29 BLOCK DIAGRAM ........... 7 SCHEMATIC DIAGRAM .........

  • 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 << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Sync Total Period Video Active Sync Duration Blanking Time Back Porch Front Porch Mode Resolution Frequency Time (A) Sort Polarity –...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW Power Button AC Power Socket See Front Control Panel Signal Cable Front Control Panel 3. SET Button 1. Power ON/OFF Button This button to enter a selection in the on screen display. This button is used to turn the monitor ON and OFF. 4.

  • Page 7: Block Diagram

    < OSD Control > SELECT Heater ( 6.3V ) Signal H-Sync Sig POWER Cable VIDEO ON/OFF VIDEO V-Sync Sig PRE-AMP MAIN AMP C DATA(SDA) (IC302) BRIGHTNESS (IC303) LM1269 CONTRAST C CLOCK(SCL) LM2469 H / V POSITION H / V SIZE SPCC OSD IC MICOM...

  • Page 8: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Line Filter & Associated Circuit. 6. Horizontal and Vertical Oscillation. This is used for suppressing noise of power input line This circuit generates the horizontal pulse and the vertical flowing into the monitor and/or some noise generated in pulse by taking the H and V sync signal.

  • Page 9

    15. Image Rotation (Tilt) Circuit. 17. Video Output Amp Circuit. This circuit corrects the tilt of the screen by supplying the This circuit amplifies the video signal which comes from image rotation signal to the tilt coil which is attached near the video pre-amp circuit and amplified it to applied the the deflection yoke of the CRT.

  • Page 10: Adjustment

    ADJUSTMENT GENERAL INFORMATION All adjustment are thoroughly checked and corrected 10) Adjust balance of pin-balance as arrow keys to be when the monitor leaves the factory, but sometimes the best condition. 11) DIST. ADJ. → FOS. ADJ command. several adjustments may be required. Adjustment should be following procedure and after ±...

  • Page 11

    4. Input EDID Data. 17-1) Adjust R-DRIVE and G-DRIVE command to white 1) Display color 15,0 cross hatch pattern at Mode 4. ± 0.003 and y=0.298 ± 0.003 on the balance x=0.283 2) EEPROM → Write EDID command and confirm White Balance Meter with PC arrow keys.

  • Page 12: 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 13

    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) P303 12V LINE/ PIN 8 (12V) ?

  • Page 14

    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 15: 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 16: 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 30K ~ 33.9K C722, C723, C726, C729 34K ~ 38.9K 39K ~ 44.9K...

  • Page 17: 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 18

    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? T701 40V LINE (H-FBP) Pin 10 Pin 5 CHECK TROUBLE IN...

  • Page 19

    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 31, 32 (H/V INPUT) DPM OFF MODE) SIGNAL? H/V SYNC CHECK TROUBLE IN IC401 PIN 13 X401 WAVEFORM? 24MHz...

  • Page 20: 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 21

    10. NO TILT (NO ROTATION ) NO TILT (NO ROTATION) CHECK TROUBLE IN IC401 PIN21 IC401 ( MI COM) WAVE FORM ? CHECK 15V LINE TROUBLE IN AND 6.3V LINE ? 15V LINE, 6.3V LINE CHECK TROUBLE IN Q503 EMITTER Q501~Q503 VOLTAGE ? TROUBLE IN...

  • Page 22: Exploded View

    EXPLODED VIEW...

  • Page 23: Exploded View Parts List

    CABINET ASSEMBLY, FB775G BRAND 035 CKD 3091TKC071J CABINET ASSEMBLY, FB775G BRAND 035 SP CKD -Brazil only 2423GC3E41M CDT(CIRC), M41QBF423 x 31NPLD LG PHILIPS DISPLAYS 70KHZ 29.1M -For Northern Hemisphere 2423GC3E41U CDT(CIRC), M41QBF423X 32SPLD LG-PHILIPS Displays 70KHZ 29.1 mm -For Southern Hemisphere 2423GC3E41N CDT(CIRC), M41QBF423X 31RPLD LG-PHILIPS Displays 70KHZ 29.1 mm -For Equatorial...

  • Page 24: 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. 05. 22. DATE: 2002. 05. 22. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.

  • Page 25

    DATE: 2002. 05. 22. DATE: 2002. 05. 22. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C747 0CK3320W515 3300P 500V K B D313 0DS124409AA 1SS244 TP ROHM KOREA C748 181-288B MKT 100V 104JTR PHS26104 D314 0DS124409AA...

  • Page 26

    KTC3205-Y(KTC2236A) TP KEC T Q512 0TR127509AC KTA1275-Y(KTA1013) TP KEC TO Q701 0TR200009AB KTC200-Y TP KEC TO92 NPN Q706 0TR558900BA 2SC5589(LG,W/M) BK TOSHIBA T IC301 0IPRPMJ008A MTV038N-15EG MYSON 16P DIP S Q707 0TR127009AA KTA1270-Y(KTA562TM) TP KEC T IC302 0IPRPNS003A LM1269NA NATIONAL SEMICONDUC...

  • Page 27

    DATE: 2002. 05. 22. DATE: 2002. 05. 22. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R322 0RD2200Q609 220 1/4W(3 5% TA52 R597 0RD3902Q609 39K 1/4W(3 5% TA52 R323 0RD2200Q609 220 1/4W(3 5% TA52 R598 0RD5601Q609...

  • Page 28

    2K 1/4W(3 5% TA52 SW207 140-058D SKHV10911A LGEC NON 12 20 HO R805 0RD2001Q609 2K 1/4W(3 5% TA52 T701 6174T11003E “1054A,CB777G LG-PHILIPS 17””” R806 0RD4702Q609 47K 1/4W(3 5% TA52 T702 6170TCZ013A EI2218 26UH D/FOCUS,FB775G R808 0RD6802Q609 68K 1/4W(3 5% TA52...

  • Page 29: 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 30: Schematic Diagram

    IIC-SDA IIC-SCL DDC-SDA DDC-SCL...

  • Page 31

    1. CONTROL BOARD (Component Side) 2. CONTROL BOARD (Solder Side) 3. MAIN BOARD (Component Side) 4. MAIN BOARD (Solder Side)

Comments to this Manuals

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Latest comments:
  • mosu Dec 25, 2016 01:37:
    Hello
    Why printed LG Flatron 775FT Service Manual Page 30 is a schematic half.
    Plea​se fix it.