LG Flatron F900B Service Manual
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LG Flatron F900B Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CA-130
FACTORY MODEL: F900BJ
MODEL:
(
) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
F900B
(F900BJ-AL**E)

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Summary of Contents for LG Flatron F900B

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-130 FACTORY MODEL: F900BJ MODEL: F900B (F900BJ-AL**E) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 DESCRIPTION OF BLOCK DIAGRAM....11 SAFETY PRECAUTIONS ........3 ADJUSTMENT ............13 TIMING CHART ............4 TROUBLESHOOTING GUIDE ......15 OPERATING INSTRUCTIONS ........ 5 EXPLODED VIEW..........21 CONTROL LOCATIONS ......... 7 REPLACEMENT PARTS LIST ......23 WIRING 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 FACTORY PRESET MODE MODE MARK MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 VESA Sync Polarity – Frequency 43.269 53.674 68.677 91.146 93.750 µs Total Period 23.112 18.631 14.561 10.971 10.666 µs Video Active Time 17.778 14.222 10.836...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW USB port AC Power Socket See Front Control Panel Power Button D-Sub Signal Connector Front Control Panel 1. Power Button Button Use these buttons to choose or adjust items in This button is used to turn the monitor ON and the on screen display.
  • Page 6 Universal Serial Bus Making use of USB (Universal Serial Bus)* USB(Universal Serial Bus) is an innovation in connecting your different desktop peripherals conveniently to your computer. By using the USB, you will be able to connect your mouse, keyboard and other peripherals to your monitor instead of having to connect them to your computer.

  • Page 7: Control Locations

    CONTROL LOCATIONS VR801 : High Voltage Adjustment (27kV) VR901 : B Adjustment (190V Line) - 7 -...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM P250 P201 P401 P402 P801 P453 P451 P902 P901 P702 P910 Socket P502 Signal Cable P302 P301 P303 - 8 -...

  • Page 9: Disassembly

    DISASSEMBLY 1. TILT/SWIVEL & BACK COVER REMOVAL 1) Set the monitor face downward. 2) Carefully remove the Tilt/Swivel by pulling it upward. 3) Remove two screws (a). 4) Pressing the latch (b), Back cover by pushing it upward. (See Figure. 1) 5) Release the latch (c).

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 10 -...

  • Page 11: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Line Filter & Associated Circuit. 5. X-ray Protection. This is used for suppressing noise of power input line This circuit detects the rectified DC voltage comes flowing into the monitor and/or some noise generated from the FBT pin 4. If the high voltage of the FBT in this monitor flowing out through the power input reaches up to about 30kV (abnormal state), H.V control (IC802) detects.
  • Page 12 12. High Voltage Output & FBT (Flyback Transformer). 18. Static Convergence Control Circuit. The high voltage output circuit is used for generating This circuit corrects the convergence of the screen by pulse wave to the primary coil of the FBT (Flyback supplying the convergence signal to the 4H (STC) coil Transformer (T701)).

  • Page 13: Adjustment

    ADJUSTMENT GENERAL INFORMATION 3) EEPROM → ALL CLEAR → Y(Yes) command. All adjustment are thoroughly checked and corrected when the monitor leaves the factory, but sometimes <Caution> Do not run this procedure unless the several adjustments may be required. EEPROM is changed. All data in EEPROM (mode Adjustment should be following procedure and after data and color data) will be erased.
  • Page 14 11) Display color 15,0 Full White(70x70mm) at mode 4. 6. Adjustment for Focus. 12) DRIVE ADJ command. 1) Display H character in full screen at Mode 4. 13) Set B-DRIVE to 94(5E(h)) at DRIVE of the 2) Adjust two Focus control on the FBT that focus alignment program.

  • Page 15: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK TROUBLE IN FUSE OK? FUSE (F901) (F901) CHECK TROUBLE IN D901 BRIDGE DIODE BRIDGE DIODE? (D901) CHECK C905(+) VOLTAGE TROUBLE IN 145VDC at 110V input 310VDC at 220V input IC901 CHECK TROUBLE IN...
  • Page 16 2. NO CHARACTER NO CHARACTER TROUBLE IN CHECK P301, SIGNAL CABLE, IC302 PIN 5, 6, 7 ? PC SIGNAL CHECK TROUBLE IN IC302 PIN 19, 20, 21 IC302, P302 PIN 10 (5V) ? CHECK IC303 PIN 1, 3, 5 TROUBLE IN PIN10 (12V), IC303 PIN 6 (80V) ?
  • Page 17 3. NO RASTER NO VIDEO (POWER INDICATOR GREEN or AMBER) CHECK AMBER POWER INDICATOR TROUBLE IN GREEN or AMBER ? P302 SIGNAL CABLE GREEN CHECK ROTATE SCREEN SCREEN CONTROL CONTROL KNOB TO KNOB OF FBT CLOCKWISE or COUNTER CLOCKWIES CHECK VOLTAGE AT D924/D926 CATHODE (190V) TROUBLE IN PRIMARY...
  • Page 18 4. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 Pin 3 T901 15V LINE (15V) ? CHECK TROUBLE IN IC601 PIN 7 T701 47V LINE (47V)? CHECK TROUBLE IN IC801 PIN 12 IC801 (SAWTOOTH WAVE)? TROUBLE IN IC601, V-CIRCUIT - 18 -...
  • Page 19 5. TROUBLE IN DPM STAND-BY/SUSPEND/ DPMS OFF MODE FAILURE CHECK CHECK PC, IC401 (MICOM) INPUT H/V SYNC SIGNAL (PC IS NOT GOING INTO PIN 40, 41 (H/V INPUT) DPM MODE) SIGNAL? NO H/V SYNC SIGNAL CHECK TROUBLE IN IC401 PIN 9, 8 X401, IC401 WAVEFORM? CHECK...
  • Page 20 6. NO DEGAUSSING NO DEGAUSSING CHECK TROUBLE IN IC401 PIN 6 IC401 (MICOM) (5V)? CHECK TROUBLE IN Q920 COLLECTOR D925 VOLTAGE (0.5V)? CHECK TROUBLE IN P901? P901 CHECK TROUBLE IN RL901? RL901 TROUBLE IN TH901, DEGAUSSING COIL - 20 -...
  • Page 21 - 21 -...

  • Page 22: Exploded View

    Description 3091TKC095A CABINET ASSEMBLY, F900BJ BRAND TKC075A LGC (ER04) B/A SW 6318L19008A CDT(CIRC), M46QDG423X11NDDD LG-PHILIPS 107KHZ 29.1MM FLATRON TCO V2 3809TKC045D BACK COVER ASSEMBLY, FB990G 3808TKC044 PFC/TCO99 - For Euope 3809TKC045A BACK COVER ASSEMBLY, FB990G 3808TKC044 BRAND-8C358 - For U.S.A, Canada, Israel, Saudi...

  • Page 23: 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: 2003. 4. 18. DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 24 DATE: 2003. 4. 18. DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION DIODEs C833 181-482D 184J 18.0*15.0*8.5*7.5 250V C834 0CN1040K949 0.1M 50V Z F TA52 D301 0DS141489AB 1N4148 TP GRANDE DO-34 500MW C835...
  • Page 25 FERRITE KQ-1 JS 3.5*5.0MM AX Q726 0TR555109AB 2N5551 TP SAMSUNG TO92 AMP FB302 125-155A BFD3510R2FG SAMWHA 3.5*10MM Q771 0TR920009AB KSP92 TP SAMSUNG TO92 HIGH V FB303 125-022J FERRITE KQ-1 JS 3.5*5.0MM AX Q801 0TR558900BA 2SC5589(LG,W/M) BK TOSHIBA T - 25 -...
  • Page 26 DATE: 2003. 4. 18. DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q802 0TR471009AA KSD471AC-Y TP SAMSUNG TO92 R401 0RD3300Q609 330 1/4W(3 5% TA52 Q803 0TR564009AB KSB564AC-YTA TP SANSUNG TO92 R402 0RD1000Q609...
  • Page 27 DATE: 2003. 4. 18. DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R705 0RB0150K609 0.15 OHM 2 W 5% TA52 R706 0RD1003Q609 100K 1/4W(3 5% TA52 R822 0RN3601F409 3.6K 1/6W 1 TA52...
  • Page 28 DATE: 2003. 4. 18. DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R921 0RD0332Q609 33 1/4W(3 5% TA52 R202 0RD1600Q609 160 1/4W(3 5% TA52 R922 0RD5601Q609 5.60K 1/4W(3 5% TA52 R203 0RD2200Q609...
  • Page 29 DATE: 2003. 4. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R813 0RH1004D622 1.0M 1/10W 5 D.R/TP R814 0RH1004D622 1.0M 1/10W 5 D.R/TP R817 0RH0222D622 22 1/10W 5 D.R/TP R821 0RH1501D622 1.5K OHM 1 / 10 W 2012 5.00% R828 0RH0222D622 22 1/10W 5 D.R/TP...

  • Page 30: Pin Configuration

    PIN CONFIGURATION M24C08 Serial I C BUS EEPROM SYMBOL PSDIP8 (BN) DESCRIPTION 0.25mm Frame Chip Enable Input E0-E2 Serial Data Address Input/Output Serial Clock Write Control SO8 (MN) 150mil Width Supply Voltage Logic Dirgram TSSOP8 (DW) Ground 169mil Width M62501P /FP Teerminal Number and The facillty PIN CONFIGURATION(TOP VIEW) PIN NO.
  • Page 31 TDA4867J PHILIPS 32P, SDIP SYMBOL DESCRIPTION non-inverted input inverted input supply voltage OUTB output B OUTB ground TDA4867J OUTA output A OUTA flyback supply voltage V FB GUARD guard output GUARD FEEDB feedback inprt FEEDB Pin Configuration GUARO output/ power save mode GUARD FLYBACK CIRCUIT...
  • Page 32 TDA4841PS PHLIPS 32P HFLB FOCUS XRAY HSMOD HPLL2 BSENS HCAP HREF BDRV HBUF PGND HPLL1 HDRV SGND TDA4841PS XSEL VCAP VREF EWDRV VAGC VOUT2 VSMOD VOUT1 ASCOR VSYNC HSYBC CLBL HUNLOCK Pin Configuration EHT compensaton Block Diagram via vertical size EHT compensation via horizontal size 1.2V...

  • Page 33: Schematic Diagram

    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. - 33 - - 34 -...

  • Page 34: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. CONTROL BOARD (Component Side) 2. CONTROL BOARD (Solder Side) 5. USB BOARD (Component Side) 3. MAIN BOARD (Component Side) 4. MAIN BOARD (Solder Side) 6. USB BOARD (Solder Side) - 35 - - 36 -...
  • Page 35 Apr. 2003 P/NO : 3828TSL087D Printed in Korea...

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