LG FM776F Service Manual
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LG FM776F Service Manual

LG FM776F Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CA-106
FACTORY MODEL : FM776F
MODEL:
*(
) ID LABEL MODEL No.
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
OS D
SE T
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
776FM
(FM776F-EA)

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Summary of Contents for LG FM776F

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CA-106 FACTORY MODEL : FM776F MODEL: 776FM (FM776F-EA) ) ID LABEL MODEL No. CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. OS D SE T...

  • 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..........26 CONTROL LOCATIONS ......... 7 REPLACEMENT PARTS LIST ......28 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 MODE 5 MODE 6 MODE 7 MODE 8 MODE 9 MODE 10 Sync Polarity — — — — 46.88 53.68 68.677 37.88 60.02 63.98 Frequency 37.50...

  • Page 5: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW Audio In Mic Out AC Power Socket Left Side Jacks See Front Control Panel D-Sub Signal Cable Front Control Panel Sound Mute OSD Button SET Button Power ON/OFF Button Power (DPMS) Indicator Sound Menu Button Built-in Microphone 1.

  • Page 6: Left Side Jacks

    Left Side Jacks Headphone Jack Headphone Jack that automatically mutes the speaker volume when headphone is attached. Microphone Jack An external microphone can be used instead of the built-in microphone. Rear Panel Jacks Mic. Out Connects microphone sound to PC via cable. Audio In Connects speaker sound to PC via cable attachment.

  • Page 7: Control Locations

    CONTROL LOCATIONS VR901: B Adjustment - 7 -...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM P201 P501(Purity Coil) P804 P402 P803 P502 P802 P801 P904 P403 P401 P702 Speaker Speaker P704 P902 P703 Socket P701 Audio-IN Signal P805 Cable MIC-OUT P302 P301 - 8 -...

  • Page 9: Disassembly

    DISASSEMBLY 1. TILT/SWIVEL REMOVAL 2. BACK COVER REMOVAL 1) Set the monitor face downward. 1) Remove two screw covers (a). 2) Pressing the latch (a), carefully remove 2) Remove four screws (b) from the Back Cover. the Tilt/Swivel by pulling it upward. 3) Remove the Signal Cap (c).
  • Page 10 4. TOTAL CHASSIS ASSEMBLY REMOVAL 1) Disconnect P902 (Degaussing pin), P704 (DY pin), P502, P501 and P701 from the Main PCB. 2) Disconnect P401. 3) Disconnect eight connects (a). 4) Carefully separate the CDT Board P801 Assembly from the CDT neck. P802 5) Discharge the remaining static P803...
  • Page 11 6. REAR JACK & INTERFACE ASSEMBLY REMOVAL 1) Remove the screw (a). 2) Remove the Rear Jack Assembly. 3) Remove eight screws (b). 4) Carefully remove the Interface Assembly from the Main Total Ass’y. 7. MAIN BRACKET REMOVAL 1) Remove three screws (a). 2) Remove the Rear Bracket.

  • Page 12: Block Diagram

    BLOCK DIAGRAM Dynomic Focus Static Focus Screen - 12 -...

  • Page 13: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. SMPS(Switching Mode Power Supply) 8. Horizontal linearity Circuit. When you turn on the power switch, the operating This circuit corrects the horizontal linearity for each procedure is as follows: horizontal sync frequency. 1) The AC line voltage is rectified by the bridge diodes D900 and C908 9.

  • Page 14: Adjustment

    5) Display color 0,0 pattern at Mode 4. 1) Set Brightness and Contrast to Max position. 6) COLOR ADJ. → BIAS ADJ. command of the 2) Run alignment program for FM776F on the IBM alignment program. compatible PC. 7) Set Sub-Brightness to 120(78h) position. Check 3) EEPROM→ALL CLEAR→Y(YES) command.
  • Page 15 14) Adjust B-DRIVE and G-DRIVE command to white 4. Adjustment for Focus. ± 0.02 and y=0.298 ± 0.02 on the balance x=0.283 1) Display H character in full screen at Mode 4. White Balance Meter with PC arrow keys. 2) Adjust two Focus control on the FBT that focus ±...

  • Page 16: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK TROUBLE IN FUSE FUSE OK? (F901) (F901) CHECK C908 VOLTAGE? TROUBLE IN D900 (AC120V: 160VDC, AC220V: 304VDC) CHECK IC901 PIN 6 TROUBLE IN WAVEFORM (SQUARE WAVE IC901 COMES OUT?) CHECK TROUBLE IN D941, D942, D951,...
  • Page 17 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 18, 19, 20 ? IC302 CHECK TROUBLE IN IC303 PIN 4 (80V)
  • Page 18 3. NO RASTER NO VIDEO (POWER INDICATOR ON) CHECK ORANGE DPM MODE POWER INDICATOR (NO H and/or V SYNC) GREEN or ORANGE? GREEN CHECK TROUBLE IN D712 ANODE D712 (-160V)? CHECK TROUBLE IN G1 VOLTAGE? Q704 (-45 ~ -55V) CHECK TROUBLE IN CDT HEAT D941, Q942, Q941...
  • Page 19 4. NO HORIZONTAL DEFLECTION NO H-DEFLECTION (ONE VERTICAL LINE) CHECK TROUBLE IN Q706? Q706 CHECK TROUBLE IN B + VOLTAGE 50V LINE (49.5V)? CHECK T701(FBT) PIN 2 TROUBLE IN (31KHZ, 60V Q719, Q720, D710 69KHZ, 130V ? CHECK TROUBLE IN Q705 COLLECTOR Q705 WAVEFORM?
  • Page 20 5. TROUBLE IN H-LINEARITY UNBALANCED OF H-LIN. CHECK TROUBLE IN IC401 IC401 (MICOM) PIN 1, 2, 3, 24 ? CHECK TROUBLE IN Q711~Q716? Q711~Q716 CHECK TROUBLE IN L703, Q710, D730? L703, Q710, D730 Cs SIGNAL TABLE HORIZONTAL FREQUENCY(fH) TROUBLE IN 30K ~ 34K C722, C723, C726, C729 34K ~ 40K...
  • Page 21 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 - 21 -...
  • Page 22 7. TROUBLE IN OSD (ENTER BUTTON MUST BE PRESSED.) NO OSD CHECK TROUBLE IN IC301 B + ? 5V LINE DC 5V CHECK TROUBLE IN IC301 PIN 5, 10 IC601 PIN8 (V-FBP), WAVEFORM? T701 40V LINE (H-FBP) Pin 10 CHECK TROUBLE IN IC301 PIN 12 IC302, IC301...
  • Page 23 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 24 9. NO DEGAUSSING NO DEGAUSSING (DEGAUSS ON THE OSD MENU MUST BE PRESSED.) CHECK TROUBLE IN IC401 PIN 8 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 25 10. NO TILT (NO ROTATION ) NO TILT (NO ROTATION) CHECK TROUBLE IN Q504(COLLECTOR) IC401 ( MI COM) WAVE FORM ? CHECK TROUBLE IN 15V LINE 15V LINE, 6.3V LINE AND 6.3V LINE ? CHECK TROUBLE IN Q503 EMITTER Q501~Q503 VOLTAGE ? TROUBLE IN P502, TILT COIL, D501...
  • Page 26 - 26 -...

  • Page 27: Exploded View Parts List

    COVER ASSEMBLY, FM776B SPEAKER 3550TKS008A DOME(R) 6513TCO001A MICRO PHONE ASSY, CM790,CMT-64(BOSUNG) 6871TVT272A PWB(PCB) ASSEMBLY, VIDEO, FM776F VIDEO TOTAL BRAND 6871TMT272B PWB(PCB) ASSEMBLY, MAIN, FM776F NON PFC BRAND CA-106 TOTAL 3313T17247B MAIN TOTAL ASSEMBLY, FM776F NON PFC BRAND CA-106 - 27 -...

  • Page 28: 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: Flatron 776FM (FM776F-EA) DATE: 2001. 11. 13. MODEL: Flatron 776FM (FM776F-EA) DATE: 2001. 11. 13. *S *AL LOC. NO.
  • Page 29 MODEL: Flatron 776FM (FM776F-EA) DATE: 2001. 11. 13. MODEL: Flatron 776FM (FM776F-EA) DATE: 2001. 11. 13. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION DIODEs C725 0CZZTFT001Z ECQB1H104JM3 104J 50V TP5.0...
  • Page 30 PHILIPS BC547C TP TO92 65V IC401 0IMCRSS002A S3P863A SAMSUNG ELECTRONICS Q513 0TR390600CA 2N3906 TP SAMSUNG TO92 NPN IC401 0IZZTSZ135E FM776F 48PIN BK OTP CA-92 Q702 0TR200009AB KTC200-Y TP KEC TO92 NPN IC402 0ISG240860A M24C08-BN6 8DIP BK 8K SERIA Q703 0TR114009AB...
  • Page 31 MODEL: Flatron 776FM (FM776F-EA) DATE: 2001. 11. 13. MODEL: Flatron 776FM (FM776F-EA) DATE: 2001. 11. 13. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 0RD2702Q609 27K 1/4W(3 5% TA52 R346...
  • Page 32 MODEL: Flatron 776FM (FM776F-EA) DATE: 2001. 11. 13. MODEL: Flatron 776FM (FM776F-EA) DATE: 2001. 11. 13. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R704 0RD3601Q609 3.60K 1/4W(3 5% TA52...
  • Page 33 MODEL: Flatron 776FM (FM776F-EA) DATE: 2001. 11. 13. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R986 0RN2202F409 22K 1/6W 1% TA52 R987 0RN5101F409 5.10K 1/6W 1% TA52 R988 0RN2201F409 2.20K 1/6W 1% TA52 R989 0RN1501F409 1.5K 1/6W 1 TA52...

  • Page 34: Pin Configuration

    PINC CONFIGURATION TDA4866J Current Driven Vertical Deflection Booster SYMBOL OUTB TDA4866J OUTB OUTA V FB GUARD OUTA FEEDB GUARD Pin Configuration FEEDB 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 35 TDA7449 SGS-THOMOSN TONE CONTROL DIGITALLY CONT. AUDIO PROCESSOR Pin Configuration PIN CONNECTION CREF PGND DIG_GND ROUT TREBLE(R) LOUT TREBLE(L) R_IN2 BIN(L) BOUT(L) R_IN1 L_IN1 BOUT(R) DIP20 L_IN2 BIN(R) MUXOUT(L) MUXOUT(R) ORDERING NUMBER: TDA7449 D98AU848 BLOCK DIAGRAM MUXOUTL TREBLE(L) BIN(L) BOUT(L) L-IN1 100K L-IN2...
  • Page 36 KA431/A TO-92 BLOCK DIAGRAM REFERENCE CATHODE 1:Ref. 2: Anode 3: Cathode 8 DIP 2.5 Vref ANODE CATHODE (K) 1: Cathode 6: Anode 8: Ref. 2, 3, 4, 7: N.C 8 SOP REFERENCE (R) ANODE (A) 1: Cathode 2, 3, 6, 7: Anode 8: Ref. 4, 5: N.C KA3842B Current-Mode PWM Controller...
  • Page 37 TYPE PARTS TYPE PARTS 2N3904 KTA1275 KTC3206 KTD1413 IRFS630A KTA1270 DTC114E KTC200-Y KTC3198 1: GND 2: OUT 3: IN KSB564AC - 37 -...
  • Page 38 4.5V 10ms 8.7V 557V 1200V 435V 100V 300V...

  • Page 39: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. MAIN BOARD (Component Side) 2. MAIN BOARD (Solder Side) 9. VIDEO BOARD (Component Side) 10. VIDEO BOARD (Solder Side) 3. CONTROL BOARD (Component Side) 4. CONTROL BOARD (Solder Side) 11. PHONE BOARD (Component Side) 12. PHONE BOARD (Solder Side) 7.
  • Page 40 Nov. 2001 P/NO: 3828TSL045R Printed in Korea...

This manual is also suitable for:

Flatron 776fmFm776f-ea

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