LG Flatron 795FT Plus (FB795E-UA) Service Manual
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LG Flatron 795FT Plus (FB795E-UA) Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CA-103
FACTORY MODEL: FB795E
MODEL:
*(
) ID LABEL Model No.
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
(
) 795FT Plus
795FT Plus
(FB795E-UP)
(FB795E-UA),

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Summary of Contents for LG Flatron 795FT Plus (FB795E-UA)

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-103 FACTORY MODEL: FB795E MODEL: ) 795FT Plus (FB795E-UA), 795FT Plus (FB795E-UP) ) ID LABEL Model No. CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 DESCRIPTION OF BLOCK DIAGRAM....13 SAFETY PRECAUTIONS ........3 ADJUSTMENT ............15 TIMING CHART ............4 TROUBLESHOOTING GUIDE ......17 OPERATING INSTRUCTIONS ........ 5 EXPLODED VIEW..........24 CONTROL LOCATIONS ......... 7 REPLACEMENT PARTS LIST ......26 WIRING DIAGRAM ..........

  • Page 3: Safety Precautions

    26kV. The following steps describe modify the original design without obtaining written how to measure the high voltage and how to prevent X- permission from LG or you will void the original parts and radiation. labor guarantee.

  • Page 4: Timing Chart

    TIMING CHART VIDEO SYNC FACTORY PRESET MODE MODE MARK MODE 1 MODE 2 MODE 3 MODE 4 VESA Sync Polarity – Frequency 43.269 53.674 68.677 91.146 µs Total Period 23.112 18.631 14.561 10.971 µs Video Active Time 17.778 14.222 10.836 8.127 µs Blanking Time...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW AC Power Socket USB Downstream ports See Front Control Panel Power Button D-Sub Signal Connector USB Upstream port Front Control Panel 1. Power ON/OFF Button 4. OSD Select/adjust Button This button is used to turn the monitor ON and Use these button to choose or adjust items in the OFF.
  • 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, printer, and other peripherals to your monitor instead of having to connect them to your computer.

  • Page 7: Control Locations

    CONTROL LOCATIONS VR701 : High Voltage Adjustment VR901: B Adjustment (190V Line) - 7 -...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM Anode Cap DY-Pin DY Assembly Screw P303 P303 P302 P520 P701 Degaussing Coil P921 P901 P702 P401 P451 P102 P453 - 8 -...

  • Page 9: Disassembly

    DISASSEMBLY 1. TILT/SWIVEL REMOVAL 1) Set the monitor face downward. 2) Pressing the latch (a), carefully remove the Tilt/Swivel by pulling it upward. 2. BACK COVER REMOVAL 1) Remove four screws (a) from the Back Cover. 2) Slide the Back Cover away from the Front Cabinet of the monitor.
  • Page 10 4. TOTAL CHASSIS ASSEMBLY REMOVAL 1) Disconnector the CDT Earth Pin(a). 2) Remove four screws (a). 3) Disconnect P901 (Degaussing pin), P701 (DY pin), P451, P453 from the Main PCB. 4) Disconnect P301, P302, P303 from the Video PCB. 5) Remove the DY Assembly Screw (c). 6) Carefully separate the CDT Board Assembly from the CDT neck.
  • Page 11 6. MAIN BRACKET & CONTROL PCB ASS’Y 5. BOTTOM BRACKET REMOVAL REMOVAL 1) Remove five screws (a). 1) Remove eight screws (a). 2) Remove the Bottom Bracket. 2) Carefully remove the Metal Rear Shield from the Main PCB Board. 3) Removethe screw (b). 4) Remove the Control PCB Assembly from the Main Bracket.

  • Page 12: Block Diagram

    BLOCK DIAGRAM Dynamic Focus Static Focus Screen COIL COIL TILT DEGAUSSING - 12 -...

  • Page 13: 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 (IC702) detects.
  • Page 14 11. D/D Drive & Convert Circuit. 19. Image Rotation (Tilt) Circuit. This circuit is used for supplying B + voltage to This circuit corrects the tilt of the screen by supplying horizontal deflection output transistor (Q708). This the image rotation signal to the tilt coil which is circuit makes to add side-pincushion correcting signal attached to the CDT near the deflection.

  • Page 15: Adjustment

    ADJUSTMENT GENERAL INFORMATION All adjustment are thoroughly checked and corrected 3) EEPROM ALL CLEAR Y(Yes) command. 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 16 11) Display color 15,0 box pattern(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 100(decimal) at DRIVE of the 2) Adjust two Focus control on the FBT that focus alignment program.

  • Page 17: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK TROUBLE IN FUSE OK? FUSE (F901) CHECK TROUBLE IN D901 BRIDGE DIODE BRIDGE DIODE? (D901) CHECK C907(+) VOLTAGE TROUBLE IN 155VDC at 110V input IC901 310VDC at 220V input CHECK TROUBLE IN D912, D928 ?
  • Page 18 2. NO CHARACTER NO CHARACTER TROUBLE IN CHECK P301, SIGNAL CABLE, IC302 PIN 5, 6, 7 ? PC SIGNAL CHECK TROUBLE IN IC302 PIN 18, 19, 20, IC302, P302 PIN 6 (5V) ? CHECK IC303 PIN 1, 3, 5 TROUBLE IN PIN10 (12V), IC303 PIN 6 (80V) ?
  • Page 19 3. NO RASTER NO VIDEO (POWER INDICATOR GREEN or AMBER) CHECK AMBER POWER INDICATOR TROUBLE IN GREEN or AMBER ? P302 SIGNAL CABLE GREEN MIN. ROTATE SCREEN CHECK (Counter-clockwise) CONTROL KNOB TO SCREEN CONTROL CLOCKWISE KNOB OF FBT CHECK VOLTAGE AT D912 CATHODE (190V) TROUBLE IN PRIMARY D928 CATHODE (80V)
  • Page 20 4. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 Pin 2 T901 PIN 15 (15V) ? CHECK TROUBLE IN IC601 PIN 4 T901 PIN 17, D906 (-12V)? CHECK TROUBLE IN IC701 PIN 13 IC701 (SAWTOOTH WAVE)? TROUBLE IN IC601, V-CIRCUIT - 20 -...
  • Page 21 5. TROUBLE IN DPM STAND-BY/SUSPEND/ OFF MODE FAILURE CHECK CHECK PC, IC401 (MICOM) NO H / V SYNC SIGNAL (PC IS NOT GOING INTO PIN 40, 41 (H/V INPUT) DPM MODE) SIGNAL? INPUT H/V SYNC CHECK TROUBLE IN IC401 PIN 9, 8 X401, IC401 WAVEFORM? CHECK...

  • Page 22: No Degaussing

    6. NO DEGAUSSING NO DEGAUSSING CHECK TROUBLE IN IC401 PIN 6 IC401 (MICOM) (5V)? CHECK TROUBLE IN Q908 COLLECTOR D914 VOLTAGE (0.5V)? CHECK TROUBLE IN P901? P901 CHECK TROUBLE IN RL901? RL901 TROUBLE IN TH901, DEGAUSSING COIL - 22 -...
  • Page 23 7. TROUBLE IN OSD NO OSD CHECK TROUBLE IN IC301 PIN 4 P302 (5V) ? CHECK IC301 PIN 5 TROUBLE IN (NEGATIVE H-PULSE P302 COMES IN ?) CHECK IC301 PIN 18 TROUBLE IN (V-PULSE COMES IN?) P302 CHECK IC301 PIN 13, 14, 15 TROUBLE IN (IS THERE ANY SIGNAL IC301, IC401...
  • Page 24 - 24 -...

  • Page 25: Exploded View

    EXPLODED VIEW PARTS LIST Ref. No. Part No. Description 3091TKC030W CABINET ASSY FB795E BRAND 027 USB (FB795E-UP), (FB795E-UA) 3091TKC030Y CABINET ASSY FB795E BRAND 027 NT USB 2423GC3E41W CDT SET, M41QBF423X 15NPLD 3809TKC032D BACK COVER ASSY, FB795C 031 PFC D-CORE (FB795E-UP) 3809TKC032B BACK COVER ASSEMBLY, FB795C 031 D-CORE SLIM (FB795E-UA) 3809TKC015W...

  • Page 26: 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 MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. *S *AL LOC. NO. PART NO.
  • Page 27 MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C605 181-288Q MKT 100V 154JTR PHS26154 C754 0CE476CQ618 47U SHL 200V M FL TP5 C606 0CK2220K515...
  • Page 28 MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C916 0CK1040K945 0.1UF 50V Z F TR D402 0DS113309AA 1SS133 TP ROHM KOREA DO34 90V C917...
  • Page 29 MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION D753 0DS113309AA 1SS133 TP ROHM KOREA DO34 90V IC501 0ITI204600B TUSB2046B 32PQFP R/TP USB HUB...
  • Page 30 KTD2161-Y ST KEC TO220AB NPN T R125 0RH1600D622 160 OHM 1 / 10 W 5% D R/TP Q708 0TR558900BA “2SC5589(LG,W/M) BK TOSHIBA TO3” R126 0RH1101D422 1.1KOHM 1 / 10 W 1% D R/TP Q709 0TF306000AA 2SJ306 BK SANYO -250V -3A TO2...
  • Page 31 MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R180 0RH1002D622 10K OHM 1 / 10 W 2012 5.00% D R408 0RD1001Q609 1K 1/4W(3 5% TA52...
  • Page 32 MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R511 0RH1502D622 15K 1/10W 5 D.R/TP R721 0RD6201Q609 6.20K 1/4W(3 5% TA52 R512 0RH1502D622...
  • Page 33 MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R783 0RD1802Q609 18K 1/4W(3 5% TA52 R902 0RD0681Q609 6.8 OHM 1/4 W (3.4) 5% TA52 R784 0RD1001Q609...
  • Page 34 MODEL: (FB795E-UA), (FB795E-UP) DATE: 2001. 8. 24. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION OTHERs F901 131-040E 5A 250V HBC UL/CSA TRIAD RL901 6920TBB005A ALA2PF12 MATSUSHITA 250V 5A 12 SC301 6620TBD003A PCS701E PARK ELEC. 10PIN 14/36 SC901 6200TJB001H 02MD1 DELTA BK W/O GND SG301 6918TAT005E...

  • Page 35: Pin Configuration

    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) 150mil Width Supply Voltage TSSOP8 (DW) Logic Dirgram Ground 169mil Width HEF4013B Dual D Flip-Flop BLOCK DIAGRAM HEF4013B...
  • Page 36 KA358 Dual Operational Amplifier TDA8172 Vertical Deflection Output Circuit NON-INVERTING INPUT OUTPUT STAGE SUPPLY OUYPUT GROUND FLYBACK GENERATOR SUPPLY VOLTAGE INVERTING INPUT Pin Configuration KA431/A BLOCK DIAGRAM - 36 -...
  • Page 37 STR-F6454R(LF1351)5P BK SWITCHING REGULAATOR POWER BLOCK DIAGRAM START O.V.P LATCH DRIVE T.S.D SENSE O.S.C CONST ERROR 1 2 3 4 5 Terminal Symbols Description Functions Input of overcurrent detection signal and O.C.P/F.B Overcurrent/Feedback terminal constant voltage control signal Source terminal MOS FET source Drain terminal MOS FET drain...
  • Page 38 TYPE PARTS TYPE PARTS IRFS630A 2N3904 IRFS640A KSB564AC KTA1275 KTC3206 KTC3207 KTA1270 DTC114E KTC3198 KTC3202 KTC200-Y 1: GND 2: OUT 3: IN - 38 -...

  • Page 40: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. CONTROL BOARD (Component Side) 2. CONTROL BOARD (Solder Side) 5. VIDEO BOARD (Component Side) 3. MAIN BOARD (Component Side) 4. MAIN BOARD (Solder Side) 6. VIDEO BOARD (Solder Side) - 41 - - 42 -...
  • Page 41 Aug. 2001 P/NO : 3828TSL043H Printed in Korea...

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