Samsung CF6844N3X Service Manual Download Page 16 | Manualshive

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5-3 No Video (Sound OK)

Troubleshooting

Samsung Electronics

5-3

Yes

No

No

Yes

No

No

Check IC201
Pin 6 (CVBS)

Check/Replace

IC201

Check IC201

Pins 19, 20, 21

(R/G/B-OUT)

Check IC202
pin 27 (Y-IN)

Check/Replace

IC201,D205,DZ204

Check IC501,

on the CRT PCB

Check/Replace

IC501

Check/Replace

R505 (HEATER 6.3Vrms)

CRT, V999

Yes

No

Check IC201

Pin 12,37 (8V)

Check/Replace

IC804 KA7630

Yes

Yes

2Vp-p

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17
18
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Summary of Contents for CF6844N3X

Page 1: ...VISION RECEIVER CONTENTS Precautions Specifications and IC Data Disassembly and Reassembly Alignment and Adjustment Troubleshooting Exploded View and Parts List Electric Parts List Block Diagram PCB Layout Diagram Wiring Diagram Schematic Diagrams 1 2 3 4 5 6 7 8 9 10 11 ...

Page 2: ...ELECTRONICS Samsung Electronics Co Ltd OCT 1998 Printed in Korea 3S51A 4401 ...

Page 3: ...cs 10 1 FOCUS SW801 M I C O M S O U ND AMP CN602 P IP T T X MO D UL E T D A 8 8 4 4 T U N E R A U D I O M O D U L E CN701 CN502 CN401 S MP S T R ANS CN501 CN501B A S S Y P W B MA IN C R T ANODE DY SCREEN SOCKET CRT F B T CN701A CN06A CN05A R L ASSY PWB FRONT A V ...

Page 4: ...10 2 Samsung Electronics MEMO ...

Page 5: ...148 DZ302 107 121 DZ303 99 108 DZ304 102 131 DZ305 94 133 DZ306 118 135 DZ402 90 91 DZ403 75 165 DZ501 309 190 DZ502 316 190 DZ503 296 190 DZ505 321 190 DZ601 223 213 DZ602 223 215 DZ603 223 223 DZ604 223 220 DZ701 49 148 DZ702 54 148 DZ703 59 148 DZ704 41 141 DZ705 64 148 DZ801 231 33 DZ802 218 26 DZ803 150 122 DZ804 177 120 DZ805 183 12 DZ807 166 120 DZ808 209 19 DZ901 227 165 DZ904 211 145 DZ90...

Page 6: ...16 AC INPUT AC230V OR 220 240V SMPS TRANS CRT SPM 171EE IC MCU TTX RGB AMP TDA6108 TUNER TELE4 108A FBT FUH 29A003 VERTICAL AMP LA7845 H OUT TR STR KA3S1265R KA7630 H E A T E R V H HV 16 5V 14V 16 5V 180V 5V 8V 15V 155V SIF SAW FILTER TDA9814T SIF DETECTOR TDA9874 NICAM DECODER TDA9859 TDA7297 SPEAKER 8W 10W X 2 AUDIO PROCESSOR 2CH AUDIO AMP AUDIO MODULE ...

Page 7: ...401 001397 C AL 470uF 20 25V GP 10x16mm 5mm T C411 2305 000178 C FILM MPEF 10nF 5 100V TP 5mm C412 2201 000599 C CERAMIC DISC 560pF 10 500V Y5P TP 7x4 5 C413 2401 000962 C AL 22uF 20 50V GP TP 5x11 5 C414 2306 000330 C FILM MPPF 7 7nF 3 1 6KV TP 28 5x18 5x12 C415 2306 000178 C FILM MPPF 3 9nF 5 1 6KV BK 31x15x8 5 20 C416 2303 001026 C FILM PPF 33nF 10 400V TP 20x15x8 7 5 C417 2306 001017 C FILM MP...

Page 8: ...TP D301 0402 000546 DIODE RECTIFIER TVR10G 400V 1 0A DO 41 TP D302 0401 000005 DIODE SWITCHING 1N4148 75V 300MA DO 35 TP D303 0401 000005 DIODE SWITCHING 1N4148 75V 300MA DO 35 TP D304 0401 000005 DIODE SWITCHING 1N4148 75V 300MA DO 35 TP D401 0402 000493 DIODE RECTIFIER 1R5GU41 400V 1 5A DO 15L TP D402 0402 000132 DIODE RECTIFIER 1N4004 400V 1A DO 41 TP D403 0402 000132 DIODE RECTIFIER 1N4004 400...

Page 9: ...00mW TO 92 TP 120 Q908 0501 000389 TR SMALL SIGNAL KSC815 NPN 400mW TO 92 TP 120 QE01 0501 000283 TR SMALL SIGNAL KSA539 PNP 400mW TO 92 TP 120 QT01 0501 000389 TR SMALL SIGNAL KSC815 NPN 400mW TO 92 TP 120 QT02 0504 000125 TR DIGITAL KSR1012 NPN 300mW 47K TO 92 TP R201 2001 000290 R CARBON 10KOHM 5 1 8W AA TP 1 8X3 2MM R202 2001 000786 R CARBON 47KOHM 5 1 8W AA TP 1 8X3 2MM R203 2001 000290 R CAR...

Page 10: ...13 R COMPOSITION 4 7Mohm 10 1 2W AA TP 3 7x9mm R810 2003 000487 R METAL OXIDE S 12Kohm 5 2W AA TP 4x12mm R811 2003 000510 R METAL OXIDE S 15Kohm 5 2W AA TP 4x12mm R812 2008 000251 R FUSIBLE S 0 27ohm 10 2W AF TP 3 9x10mm R813 2001 000429 R CARBON 1KOHM 5 1 8W AA TP 1 8X3 2MM R814 2001 000449 R CARBON 2 2KOHM 5 1 8W AA TP 1 8X3 2M R815 2004 004364 R METAL S 152Kohm 1 1 2W AA TP 2 4x6 4m R816 2004 0...

Page 11: ...34 TP ICN01 1209 000218 IC PLL TDA9814T SOP 28P PLASTIC 5 5 ICN02 1209 001113 IC ETC LINEAR TDA9874H QFP 44P PLASTIC 6 5 JN01 2007 000029 R CHIP 0OHM 5 1 10W DA TP 2012 JN02 2007 000029 R CHIP 0OHM 5 1 10W DA TP 2012 LN01 2901 000297 FILTER EMI ON BOARD 3A 3 5x5 TP LN02 2901 000297 FILTER EMI ON BOARD 3A 3 5x5 TP LN03 2701 000168 INDUCTOR AXIAL 3 3uH 5 2 5x3 4mm LN04 2901 000297 FILTER EMI ON BOAR...

Page 12: ...6 0 CN06A AA39 20499BLEAD CONNECTOR ASSY YBNH025 04 SMP025 4 4P 200 JE01 3722 000143 JACK PHONE 1P VER 3 4mm AG BLK NO JR01 3722 001031 JACK RCA 3P 3 6MM 18 AU LA02 2701 000114 INDUCTOR AXIAL 10UH 10 2 5X3 4MM LA03 2701 000114 INDUCTOR AXIAL 10UH 10 2 5X3 4MM LA04 2701 000180 INDUCTOR AXIAL 33UH 5 2 5X3 4MM LA05 2701 000180 INDUCTOR AXIAL 33UH 5 2 5X3 4MM RA01 2001 000028 R CARBON S 100ohm 5 1 2W ...

Page 13: ... YEL OD14 2 1 8 AA61 40053A STOPPER PCB ALL MODEL HIPS HB WHT HB 1 1 9 3001 000150 SPEAKER 20W 8ohm 91dB 130Hz 2 1 10 6002 000514 SCREW TAPPING RH 2 M4 L15 ZPC BLK SWRCH18 8 1 11 ASSY PWB TTX OPTION 1 12 ASSY PWB TTX OPTION 1 13 AA64 10347A KNOB CONTROL ABS HB BLK 6844 1 1 14 AA64 40249A INDICATOR LED ACRYL HB 6844 1 1 15 AA64 40243A WINDOW REMOCON PC 6844 1 2 AA03 10018Y CRT COLOR A66EAK071X01 38...

Page 14: ...bleshooting 5 1 No Video Raster On No Sound Yes No Check Replace TU101 HC101 No Measure the Voltage of each of 8 pins of TU101 Check IC901 Pins 39 40 See No Video Sound OK See No Sound Video OK Check Replace IC901 IC201 IC902 IC701 Audio Module Yes ...

Page 15: ... Check IC804 Pin 9 5V Check Replace IC801 D802 Check Replace IC804 KA7630 DZ905 DZ804 Check IC901 Pin 18 Stand by 0V Normal 5V Check Replace IC901 Check IC901 Pin 8 4V Check Replace IC901 m com Check IC201 Pin 40 H out Check Replace IC201 Q402 Q403 No Check Q402 Q403 Check Replace DZ805 IC802 Yes Yes Yes ...

Page 16: ...IC201 Pin 6 CVBS Check Replace IC201 Check IC201 Pins 19 20 21 R G B OUT Check IC202 pin 27 Y IN Check Replace IC201 D205 DZ204 Check IC501 on the CRT PCB Check Replace IC501 Check Replace R505 HEATER 6 3Vrms CRT V999 Yes No Check IC201 Pin 12 37 8V Check Replace IC804 KA7630 Yes Yes 2Vp p ...

Page 17: ... Sound output CHECK REPLACE IC601 R601 R602 CHECK IC701 Pin 15 18 Yes Yes No Yes 1 14 15 2 5 5 Power OFF ON Repeatedly CHECK Q403 COLLECTOR H PULSE SEE NO POWER NO YES CHECK IC901 PIN26 H SYNC CHECK REPLACE IC901 Q907 C913 DZ402 NO YES CHECK IC301 PIN7 V BLANK CHECK REPLACE Q301 Q302 D304 YES NO CHECK PIN6 16 5V PIN1 14V CHECK REPLACE R409 R413 D407 D410 DZ302 DZ303 NO YES CHECK REPLACE IC301 IC20...

Page 18: ...lectronics 5 5 5 6 SMPS Power Supply Does Not Function 1 When F 802 is open C heck Replace F802 IC 801 D802 2 When F 802 is okay but SMP S does not function C heck Replace DZ801 DZ808 IC 802 DZ805 3 Others See 5 Troubleshooting ...

Page 19: ...his adjustment must be the last step 4 2 Factory Service Mode 4 2 1 Procedure for the Adjustment Mode 1 This mode uses the standard remote control The Service Mode is activated by entering the following remote control sequence 1 STAND BY DISPLAY MENU MUTE POWER ON 2 The ÒSERVICE FACTORY Ó message will be displayed The Service Mode has three compo nents Adjustment Option and Reset 3 Access the Adju...

Page 20: ...ONTROLLED OSCILLATOR 0 1 VOL VOLUME INITIAL LEVEL 0 63 PSL PAL VERTICAL SLOPE 0 63 PVS PAL VERTICAL SHIFT 0 63 PVA PAL VERTICAL AMPLITUDE 0 63 PHS PAL HORIZONTAL SHIFT 0 63 PEW PAL E W WIDTH 0 63 PEP PAL E W PALABOLA 0 63 PEC PAL E W CORNER 0 63 PET PAL E W TRAPEZIUM 0 63 VSC VERTICAL SCROLL 0 63 TSC TELETEXT SUB CONTRAST 0 63 SA SEPARATION ADJUSTMENT STEREO 0 15 QEW Q 12 8 9 MODEL E W WIDTH 0 7 P...

Page 21: ...ode is not cancelled The AGING mode is cancelled by repressing the ÒHIDDENÓ or any key on the front pannel FACTORY MODE VALUE OSD INITIAL OSD INITIAL OSD INITIAL 2 CH LCO 1 FIXED TSC 20 FIXED AGC 10 VOL 25 SA 7 VCO 80 FIXED PSL 31 FIXED QEW 5 SBT 7 PVS 31 PCT 7 FIXED SCT 16 PVA 31 PTT 31 FIXED SCR 5 FIXED PHS 40 PHM 8 FIXED SC 11 FIXED PEW 38 PVP 31 FIXED RG 31 PEP 22 PHP 31 FIXED BG 31 PEC 22 NSR...

Page 22: ...ULT POLAND POLAND MODEL ONLY LANGUAGE WEST ENG GER FRA DUT SPA ITA SWE WEST EUROPE MARKET ENGLISH GERMANY FRANCE NETHERLANDS SPAIN ITALY SWEDEN EAST ENG CZE CRO RUM HUN POL EAST EUROPE MARKET ENGLISH CZECH CROATIA ROMANIA HUNGARY POLAND SYSTEM CF SECAM L L PAL SECAM B G CI PAL I UHF BAND ONLY CK PAL SECAM B G D K CX PAL SECAM B G CB PAL B G ATS OPTION ON OFF ATM FUNCTION NOT USED FIELD POL FIELD P...

Page 23: ...empt to connect or disconnect any wires while the TV is turned on Make sure that the power cord is disconnected before replacing any parts 8 To protect against shock hazard use an isola tion transformer 4 3 2 Automatic Degaussing A degaussing coil is mounted around the pic ture tube so that external degaussing after moving the TV should be unnecessary But the receiver must be properly degaussed up...

Page 24: ...K to an oscilloscope probe 2 Input a gray scale pattern Use a pattern generator PM5518 3 Use the Picture mode for the STANDARD pic ture 4 Adjust the Screen VR on the FBT so that the voltage on the oscilloscope becomes 140 2 5V See Fig 4 1 4 3 6 Purity Adjustment 1 Warm up the receiver for at least 20 minutes 2 Plug in the CRT deflection yoke and tighten the clamp screw 3 Plug the convergence yoke ...

Page 25: ...AMP SCREW 6 POLE CONVERGENCE 4 POLE CONVERGENCE Fig 4 3 Center Convergence Adjustment 31m m Vertical Green Belt Fig 4 4 1 2 a Set up 1 Warm up the TV for at least 30 minutes in the White Pattern 2 Input a Toshiba pattern b High Light Adjustment Set SCT to 40 5 fL in the Factory Service Mode with using CA100 See Fig 4 4 c Low Light Adjustment Set SBT to 1 5 0 2 fL in the Factory Service Mode with u...

Page 26: ...bs at the same time keeping the angle constant and superimpose the red and blue horizontal line in the center of the screen 6 Adjust the two tab pairs of the 6 pole magnets to superimpose the red and blue line onto the green Changing the angle affects the vertical lines and rotating both magnets affects the horizontal lines 7 Repeat adjustments 2 6 if necessary 8 Since the 4 pole magnets and 6 pol...

Page 27: ...ust PVS so that the picture is vertically centered 3 Adjust with PVA so that the top and bottom margins of the picture are 4 4 Adjust PHS so that the picture is horizontally centered 5 Adjust with PEW so that the left and right margins of the picture are 5 6 Input a crosshatch pattern 7 Adjust PEP PEC PET for vertical linearity 4 4 5 5 ...

Page 28: ...Disassembly and reassembly Samsung Electronics 3 1 3 Disassembly and Reassembly 3 1 Back Cover Removal 1 After removing the 7 screws pull the cabinet backwards ...

Page 29: ...e the AC cord from CN801 6 Separate the DC connector from CN401 7 Separate the CN501B 8P CRT connector from CN501 8 Separate the CNA05 5P A V side connector from CN602 9 Separate the CNA01 8P CRT connector from CN701 10 Separate the Focus Screen Wire from the FBT clamper 11 Separate the TBC wire 2P speaker wires from the wire clamper 12 Separate the CN701 CN602 connector from the wire clamper 13 S...

Page 30: ...r Removal Disassembly and reassembly Samsung Electronics 3 3 7 1 Remove the speaker by pressing the tension rib 1 Separate the speaker wires from D coil located on the bottom to the right side 2 Remove the screws ...

Page 31: ...CRT backwards 2 Caution Because of the high vacuum and large surface area of the picture tube be careful while handling it 1 Always lift the picture tube by grasping it firmly around the faceplate 2 Never lift the tube by its neck 3 Do not scratch the picture tube or apply excessive pressure Fractures of the glass may cause an implosion ...

Page 32: ...F CII P AL I VHF UHF CX P AL B G SE C AM B G CK P AL B G D K SE C AM B G D K CB P AL B G CF SECAM L L PAL SECAM B G SYSTEM BAND PAL SECAM B G I PAL SECAM D K SECAM K1 PAL D VHF 2 12 1 13 2 9 UHF 21 69 21 69 13 57 SYSTEM BAND PAL SECAM B G PAL SECAM D K K1 PAL I SECAM L Picture IF Carrier 38 90 38 90 38 90 38 90 Sound IF Carrier 33 40 32 40 32 90 34 40 Color Sub Carrier 34 47 34 47 34 47 34 47 25 I...

Page 33: ...6S SOUND AMP 5W CH IC701 6 TDA9859 AUDIO PROCESSOR IC801 7 KA3S1265R SMPS IC 12A IC802 8 PC123Y PHOTO COUPLER IC803 9 78R05 SWITCHING REGULATOR IC804 10 KA7630 SWITCHING REGULATOR 5 8V IC901 11 SPM171EE MICOM IC902 12 24W16 EEPROM ICE01 13 4558 EW DRIVE AMP ICN01 14 TDA9814T SIF DETECTOR SECAM L NICAM MODULE ICN02 15 TDA9874H NICAM DEMODULATOR ICA01 16 LA7567N SIF DETECTOR A2 STEREO MODULE ICA02 1...

Page 34: ...884X Pin 56 SPM171EX Pin 52 24W16 Pin 8 TDA9859 Pin 32 IC TRANSISTOR TRANSISTOR KA7630 KA7812 IN G OUT TRANSISTOR TRANSISTOR 2SD1651 2SD1650 KSD5072 KSD5071 KSD1711 B C E E B C KSA815 Y KSA539 Y IC UPC574J or KA33V G1962 K2950M K9253M G3956M SAW FILTER 1 E C B KSR1012 KSR1010 KSR2010 Fig 2 1 Semiconductor Base Diagrams ...

Page 35: ...2 4 Samsung Electronics MEMO ...

Page 36: ... metal cabinets screwheads and control shafts The current measured should not exceed 0 5 milliamp Reverse the power plug prongs in the AC outlet and repeat the test Fig 1 1 AC Leakage Test 6 Antenna Cold Check With the unitÕs AC plug disconnected from the AC source connect an electrical jumper across the two AC prongs Connect one lead of the ohmmeter to an AC prong Connect the other lead to the co...

Page 37: ...ppear to have overheated or that are otherwise damaged should be replaced with parts that meet the original specifications Always determine the cause of damage or overheat ing and correct any potential hazards 15 Observe the original lead dress especially near the following areas Antenna wiring sharp edges and especially the AC and high voltage power supplies Always inspect for pinched out of plac...

Page 38: ...ssible conductive parts examples metal panels input terminals and earphone jacks 6 Insulation Checking Procedure Disconnect the power cord from the AC source and turn the power switch ON Connect an insulation resistance meter 500V to the blades of the AC plug The insulation resistance between each blade of the AC plug and accessible conductive parts see above should be greater than 1 megohm 7 Neve...

Page 39: ...ctrical charges that damage ESDs 5 Use only a grounded tip soldering iron when soldering or unsoldering ESDs 6 Use only an anti static solder removal device Many solder removal devices are not rated as Òanti staticÓ these can accumulate sufficient electrical charge to damage ESDs 7 Do not remove a replacement ESD from its protective package until you are ready to install it Most replacement ESDs a...

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