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LG FM776F, Service Manual

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LG FM776F Service Manual Download Page 36

- 36 -

KA431/A

2.5 Vref

REFERENCE

CATHODE

ANODE

CATHODE (K)

REFERENCE (R) 

ANODE (A)

TO-92

8 DIP

8 SOP

1:Ref. 2: Anode 3: Cathode

1: Cathode 6: Anode 8: Ref.
2, 3, 4, 7: N.C

1: Cathode 2, 3, 6, 7: Anode 8: Ref.
4, 5: N.C

1

1

BLOCK DIAGRAM

KA3842B          Current-Mode PWM Controller

8

2

7

5

7

6

5

1

3

4

5V
V

REF

SET/
RESET

INTERNAL
BIAS

LOGLC

U.V.L.O.

36V

OSCILLATOR

R

PWM

LATCH

C.S.

COMP

ERR
AMP

S

T

1/3

1/2 V

REF

1V

Vcc

Vcc

V

FB

COMP

CURRENT SENSE

R

T

/C

T

GND

PWR VC

OUTPUT

PWR GND

1

8

BLOCK DIAGRAM

Summary of Contents for FM776F

Page 1: ...ION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO CA 106 FACTORY MODEL FM776F MODEL 776FM FM776F EA Website http biz LGservice com E mail http www LGEservice com techsup html OSD SET ID LABEL MODEL No ...

Page 2: ...0Hz 2 0A Max 5 2 Power Consumption 6 DISPLAY AREA 6 1 Active Video Area Max Image Size 325 4 x 244 1mm 12 91 x 9 61 Preset Image Size 310 x 230 mm 12 20 x 9 06 6 2 Display Color Full Colors 6 3 Display Resolution 1280 Dots x 1024 Lines 60Hz 6 4 Video Bandwidth 110 MHz 7 ENVIRONMENT 7 1 Operating Temperature 0 C 40 C 32 F 104 F Ambient 7 2 Relative Humidity 8 80 Non condensing 7 3 Altitude 5 000 m ...

Page 3: ...r the original design Soldering must be inspected for the cold solder joints frayed leads damaged insulation solder splashes or the sharp points Be sure to remove all foreign materials IMPLOSION PROTECTION All used display tubes are equipped with an integral implosion protection system but care should be taken to avoid damage and scratching during installation Use only same type display tubes X RA...

Page 4: ...80 60Hz Yes MODE 7 37 88 26 40 20 00 6 40 1 00 3 20 2 20 60 32 16 579 15 840 0 739 0 026 0 106 0 607 800 x 600 60Hz Yes MODE 8 43 269 23 112 17 778 5 334 1 556 1 556 2 222 85 008 11 764 11 093 0 670 0 023 0 069 0 578 640 x 480 85Hz Yes MODE 9 60 02 16 66 13 00 3 66 0 20 1 22 2 24 75 03 13 328 12 795 0 533 0 017 0 050 0 466 1024 x 768 75Hz Yes MODE 10 63 98 15 63 11 85 3 78 0 44 1 04 2 30 60 02 16 ...

Page 5: ...icator This Indicator lights up green when the monitor operates normally If the monitor is in DPM Energy Saving mode stand by suspend power off this indicator color changes to orange 3 SET Buttons Use this button to enter a selection in the on screen display 4 OSD Select Adjust Button Use these buttons to choose or adjust items in the on screen display 5 OSD Button Use this button to enter or exit...

Page 6: ...d to reach the PC s sound card In order to use this MIC jack you need to use a cable supplied to plug into the rear of the monitor MIC OUT and into the MIC input jack of your sound card if available Audio Features A major feature of this monitor is its built in audio system This conveniently integrates a stereo audio amplifier and speakers without taking up any more space Because the monitor is de...

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

Page 8: ...WIRING DIAGRAM 8 P201 P403 P904 P301 P302 P702 P805 P2 P1 P3 P4 P902 MIC OUT Audio IN P704 P701 P703 P401 P804 P803 P802 P801 S S G2 Signal Cable AC Socket FBT P402 P502 P501 Purity Coil Speaker Speaker ...

Page 9: ...K COVER REMOVAL 1 Remove two screw covers a 2 Remove four screws b from the Back Cover 3 Remove the Signal Cap c 4 Slide the Back Cover away from the Front Cabinet of the monitor P802 to P4 a a a a a 1 TILT SWIVEL REMOVAL 1 Set the monitor face downward 2 Pressing the latch a carefully remove the Tilt Swivel by pulling it upward ...

Page 10: ...om the CDT neck 5 Discharge the remaining static electricity by shorting between the Anode Cap and the CDT ground 6 Disconnect the Anode Cap from the CDT 7 Disconnect P801 P802 P803 P804 8 Remove the screw b 9 Remove the MIC Phone Assembly 10 Remove two screws c 11 Remove the Total Chassis Assembly from the Main Frame a 5 VIDEO PCB ASSEMBLY AUDIO ASSEMBLY REMOVAL 1 Remove three screws a 2 Disconne...

Page 11: ...he 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 a a a 7 MAIN BRACKET REMOVAL 1 Remove three screws a 2 Remove the Rear Bracket 3 Release five latches b and remove the Bottom Bracket b b ...

Page 12: ...G B Bias R G B Contrast H Drive B Drive B 15V I 2 C BRIGHTNESS CONTRAST COLOR CURVE H V POSITION H V SIZE SPCC TRAPEZOID PIN BALANCE PARALLELOGRAM TILT TOP CORNER BOTTOM CORNER RECALL DEGAUSSING MOIRE LANGUAGE Audio Control Volume Treble Bass Balance Microphone Audio Mute 850V 15V 6 3V 12V 80V PURITY Control Cir 15V 6 3V Degaussing Coil Dynomic Focus Static Focus TILT Coil PURITY Coil 50V 80V 5V G...

Page 13: ...equency 7 Horizontal and Vertical Sync Processor Circuit The horizontal and vertical sync processor IC IC701 has a sync detector a saw tooth generator and drive function So output horizontal and vertical drive signal control screen distortions 8 Horizontal linearity Circuit This circuit corrects the horizontal linearity for each horizontal sync frequency 9 Horizontal drive and Output Circuit This ...

Page 14: ... Do not run this procedure unless the EEPROM is changed All data in EEPROM mode data and color data will be erased 4 COMMAND START Y Yes command 5 DIST ADJ CTRL PWM TILT command 6 Adjust tilt as arrow keys to be the best condition 7 DIST ADJ BALANCE command 8 Adjust balance of Pin Balance as arrow keys to be the best condition 9 Adjust parallelogram as arrow keys to be the best condition 10 DIST A...

Page 15: ...4 7K 4 7K 74LS06 74LS06 OFF ON OFF ON 11 VIDEO SIGNAL GENERATOR 14 Adjust B DRIVE and G DRIVE command to white balance x 0 283 0 02 and y 0 298 0 02 on the White Balance Meter with PC arrow keys 15 Adjust SUB CONTRAST command to 50 1FL of the color 15 0 box pattern 70x70mm 16 Display color 15 0 full white patten at Mode 4 17 COLOR ADJ LUMINANCE ABL command 18 Adjust ABL to 32 1FL of the luminance ...

Page 16: ...N IC901 TROUBLE IN D941 D942 D951 D961 D962 D971 TROUBLE IN D908 ZD902 Q903 Q972 Q971 Q952 Q951 Q942 Q941 CHECK FUSE OK F901 CHECK C908 VOLTAGE AC120V 160VDC AC220V 304VDC NO YES YES YES YES NO NO NO CHECK IC901 PIN 6 WAVEFORM SQUARE WAVE COMES OUT CHECK D941 D942 D951 D961 D962 D971 VOLTAGE 1 NO POWER ...

Page 17: ...1 2 3 CHECK IC303 PIN 4 80V PIN 8 12V TROUBLE IN P302 5V LINE TROUBLE IN PC SIGNAL P301 SIGNAL CABLE TROUBLE IN IC302 TROUBLE IN P302 12V LINE 80V LINE TROUBLE IN IC303 NO YES NO NO YES YES YES YES NO NO CHECK R G B CATHODE VOLTAGE TROUBLE IN R341 R343 R331 R333 L311 L313 D307 D315 TROUBLE IN IC304 CRT SOCKET YES NO ...

Page 18: ...INDICATOR GREEN or ORANGE CHECK D712 ANODE 160V CHECK G1 VOLTAGE 45 55V TROUBLE IN D712 TROUBLE IN Q704 DPM MODE NO H and or V SYNC ORANGE NO GREEN YES NO 3 NO RASTER CHECK CDT HEAT VOLTAGE 6 3V TROUBLE IN D941 Q942 Q941 YES NO TROUBLE IN CDT YES ...

Page 19: ... VERTICAL LINE CHECK Q706 CHECK B VOLTAGE 49 5V CHECK T701 FBT PIN 2 31KHZ 60V 69KHZ 130V CHECK Q705 COLLECTOR WAVEFORM TROUBLE IN Q706 TROUBLE IN 50V LINE TROUBLE IN Q719 Q720 D710 TROUBLE IN Q705 TROUBLE IN T701 P701 NO NO YES YES YES YES NO NO 0V T ...

Page 20: ...CHECK L703 Q710 D730 TROUBLE IN IC401 MICOM TROUBLE IN Q711 Q716 TROUBLE IN L703 Q710 D730 TROUBLE IN C722 C723 C726 C729 NO NO NO YES YES YES Cs SIGNAL TABLE HORIZONTAL FREQUENCY fH 30K 34K 34K 40K 40K 45K 45K 48K 48K 56K 56K 66K 66K 70K Cs1 L L H L H L H Cs3 L L L H H H H Cs2 L H H L L H H ...

Page 21: ...FLECTION ONE HORIZONTAL LINE CHECK IC601 PIN 3 15V CHECK IC601 PIN 7 40V CHECK IC701 PIN 12 13 TROUBLE IN R603 15V LINE TROUBLE IN HIGH VOLTAGE OUT CIRCUIT FBT D721 R606 TROUBLE IN IC701 TROUBLE IN IC601 V CIRCUIT NO NO YES YES YES NO 3V ...

Page 22: ...01 PIN8 V FBP T701 40V LINE H FBP TROUBLE IN IC302 IC301 TROUBLE IN IC301 IC302 NO YES DC 5V YES YES YES NO NO NO Pin 10 fv 5V H V 5V H V CHECK IC301 B CHECK IC301 PIN 12 WAVEFORM ENTER BUTTON MUST BE PRESSED 7 TROUBLE IN OSD CHECK IC301 PIN 5 10 WAVEFORM CHECK IC301 PIN 13 14 15 ...

Page 23: ...ING INTO DPM OFF MODE TROUBLE IN X401 TROUBLE IN IC401 MICOM TROUBLE IN Q941 Q942 Q951 Q952 Q971 Q972 TROUBLE IN PC OFF MODE FAILURE INPUT H V SYNC SIGNAL H V SYNC NO OFF MODE NO NO NO NO DPMF 0V DPM TABLE Mode Item NORMAL STAND BY SUSPEND OFF DPMF H L L L LED GREEN AMBER AMBER AMBER DPMS H H H L YES YES SEE DPM TABLE YES YES 3V 24MHz 8 TROUBLE IN DPM ...

Page 24: ...TOR VOLTAGE CHECK P902 CHECK RL901 TROUBLE IN IC401 MICOM TROUBLE IN Q953 TROUBLE IN P902 TROUBLE IN RL901 TROUBLE IN TH901 DEGAUSSING COIL NO DEGAUSSING DC 15V NO NO NO NO YES YES YES YES DEGAUSS ON THE OSD MENU MUST BE PRESSED 9 NO DEGAUSSING ...

Page 25: ...ILT NO ROTATION TROUBLE IN IC401 MICOM TROUBLE IN 15V LINE 6 3V LINE TROUBLE IN Q501 Q503 TROUBLE IN P502 TILT COIL D501 NO YES YES YES CHECK 15V LINE AND 6 3V LINE CHECK Q503 EMITTER VOLTAGE NO NO CHECK Q504 COLLECTOR WAVE FORM 12V ...

Page 26: ... 26 14 12 16 3 7 8 A B C 9 10 9 1 11 13 1 O SD SE T 4 15 18 17 19 20 21 1 1 1 2 2 5 6 EXPLODED VIEW ...

Page 27: ...B775 86640 COIL DEGAUSSING 1410MM 16 0OHM 0 5MM 130T 17 WITH EARTH SCREW ASSY PHP 5 30BP FZMY GW18 FBT FLY BACK TRANSFORMER FLG0096 SAMPO 17 70KHZ FLAT FILTER CIRC EMC 02MD4 LG01 DELTA BK WITH GND FM776F METAL REAR FM776B PWB PCB ASSEMBLY SUB FM776B XKGU BRAND REAR JACK TOTAL PWB PCB ASSEMBLY SUB FM776F CONTROL TOTAL BRAND CA 92 BRACKET FM776F MAIN SCREW PTP 4 30 FZMW SHIELD BOTTOM FB795B PWB PCB ...

Page 28: ...ATE 2001 11 13 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C340 181 288B MKT 100V 104JTR PHS26104 C341 0CK10302945 0 01UF 2KV Z F TR C342 0CE106CF638 10UF SHL SD 16V M FM5 TP 5 C343 0CK1040K945 0 1UF 50V Z F TR C346 0CK10202515 1000PF D 2KV 10 TR B Y5P C351 0CC1500K415 15P 50V J NP0 TP C352 0CC1500K415 15P 50V J NP0 TP C353 0CC1500K415 15P 50V J NP0 TP C354 0CC0400K115 4P 50V D NP0 TS C355 0CC04...

Page 29: ...ION D1 0DZ100009AA MTZ10B TP ROHM K DO34 500MW D201 0DL305029BA LTL 305DJ 0C2 TP LITEON GRE D301 0DS141489AB 1N4148 TP GRANDE DO 34 500M D302 0DS141489AB 1N4148 TP GRANDE DO 34 500M D303 0DS141489AB 1N4148 TP GRANDE DO 34 500M D304 0DS141489AB 1N4148 TP GRANDE DO 34 500M D305 0DS141489AB 1N4148 TP GRANDE DO 34 500M D306 0DS141489AB 1N4148 TP GRANDE DO 34 500M D307 0DS124409AA 1SS244 TP ROHM KOREA ...

Page 30: ...0R2FG SAMWHA 3 5 10MM FB311 125 022J FERRITE KQ 1 JS 3 5 5 0MM A MODEL Flatron 776FM FM776F EA DATE 2001 11 13 S AL LOC NO PART NO DESCRIPTION SPECIFICATION FB312 125 022J FERRITE KQ 1 JS 3 5 5 0MM A FB313 125 022J FERRITE KQ 1 JS 3 5 5 0MM A FB314 125 155J BFS2550A0FG SAMWHA 2 5 5 0M FB315 125 155F BFD3580R2FG SAMWHA 3 5 8 0M FB401 125 155J BFS2550A0FG SAMWHA 2 5 5 0M FB402 125 155J BFS2550A0FG S...

Page 31: ...32Q609 33 1 4W 3 5 TA52 R345 0RD0332Q609 33 1 4W 3 5 TA52 MODEL Flatron 776FM FM776F EA DATE 2001 11 13 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R346 0RD0332Q609 33 1 4W 3 5 TA52 R371 0RD3301Q609 3 30K 1 4W 3 5 TA52 R401 0RD1000Q609 100 1 4W 3 5 TA52 R402 0RD1000Q609 100 1 4W 3 5 TA52 R403 0RD1004Q609 1M OHM 1 4 W 3 4 5 TA52 R404 0RD1300Q609 130 1 4W 3 5 TA52 R405 0RD1300Q609 130 1 4W 3 5 TA5...

Page 32: ...M 1 4 W 3 4 5 TA52 R790 0RD2001Q609 2K 1 4W 3 5 TA52 R791 0RD4703Q609 470K 1 4W 3 5 TA52 R792 0RD4703Q609 470K 1 4W 3 5 TA52 MODEL Flatron 776FM FM776F EA DATE 2001 11 13 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R793 0RD4702Q609 47K 1 4W 3 5 TA52 R794 0RD3001Q609 3K 1 4W 3 5 TA52 R795 0RD4700Q609 470 OHM 1 4 W 3 4 5 TA52 R796 0RD2002Q609 20K 1 4W 3 5 TA52 R797 0RN0270G609 0 27 1 4W 5 TA52 R79...

Page 33: ... 165 004A AG20PT 152F L3N S 23 HANDOK SW201 140 058D SKHV10911A LGEC NON 12 20 H SW202 140 058D SKHV10911A LGEC NON 12 20 H SW203 140 058D SKHV10911A LGEC NON 12 20 H SW204 140 058D SKHV10911A LGEC NON 12 20 H SW205 140 058D SKHV10911A LGEC NON 12 20 H SW206 140 058D SKHV10911A LGEC NON 12 20 H SW207 140 058D SKHV10911A LGEC NON 12 20 H SW208 140 058D SKHV10911A LGEC NON 12 20 H SW209 140 058D SKH...

Page 34: ...OL E0 E2 SDA SCL WC Vcc Vss DESCRIPTION Chip Enable Input Serial Data Address Input Output Serial Clock Write Control Supply Voltage Ground 1 PSDIP8 BN 0 25mm Frame 8 1 1 SO8 MN 150mil Width TSSOP8 DW 169mil Width 8 8 Logic Dirgram KA3842B Current Mode PWM Controller 8 2 7 5 7 6 5 1 3 4 5V VREF SET RESET INTERNAL BIAS LOGLC U V L O 36V OSCILLATOR R PWM LATCH C S COMP ERR AMP S T 1 3 1 2 VREF 1V Vc...

Page 35: ...2 D98AU848 MUXOUT L 10 MUXOUT R 11 PIN CONNECTION 0 30dB 2dB STEP MUXOUTL TREBLE L MUXOUTR TREBLE R LOUT SCL SDA DIG_GND ROUT D98AU847A I 2 CBUS DECODER LATCHES 100K 100K G L IN1 L IN2 100K 100K R IN1 R IN2 G INPUT MULTIPLEXER GAIN BOUT L BIN R BOUT R CREF AGND VS BIN L 5 8 9 7 6 19 20 18 4 2 3 11 17 12 13 1 10 16 15 14 RB RB VREF BLOCK DIAGRAM VOLUME VOLUME TREBLE TREBLE BASS BASS SPKR ATT LEFT S...

Page 36: ...6 Anode 8 Ref 2 3 4 7 N C 1 Cathode 2 3 6 7 Anode 8 Ref 4 5 N C 1 1 BLOCK DIAGRAM KA3842B Current Mode PWM Controller 8 2 7 5 7 6 5 1 3 4 5V VREF SET RESET INTERNAL BIAS LOGLC U V L O 36V OSCILLATOR R PWM LATCH C S COMP ERR AMP S T 1 3 1 2 VREF 1V Vcc Vcc VFB COMP CURRENT SENSE RT CT GND PWR VC OUTPUT PWR GND 1 8 BLOCK DIAGRAM ...

Page 37: ...PARTS TYPE PARTS TYPE 2N3904 KTA1270 KTC200 Y KTC3198 E B C E C B KTD1413 B E C KTA1275 KTC3206 E B C IRFS630A G D S DTC114E 1 GND 2 OUT 3 IN 1 3 2 37 KSB564AC E B C ...

Page 38: ...1B 300V 37V 0V 10ms 8 7V 0V 1B 1200V 0V 557V 435V 100V 34V 0V 10 1B 80V 0V 1B 4 5V 0V ...

Page 39: ...IDEO BOARD Component Side 10 VIDEO BOARD Solder Side 11 PHONE BOARD Component Side 12 PHONE BOARD Solder Side 3 CONTROL BOARD Component Side 4 CONTROL BOARD Solder Side 5 REAR JACK BOARD Component Side 6 REAR JACK BOARD Solder Side 7 SOUND BOARD Component Side 8 SOUND BOARD Solder Side ...

Page 40: ...Nov 2001 P NO 3828TSL045R Printed in Korea ...

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