Samsung CT21D8L6X Service Manual Download | Manualshive

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Troubleshooting

Samsung Electronics

5-1

5. Troubleshooting

5-1 No Power

Normal

Check LED when AC

code is plugged.

Check

Fuse.

OFF

No Power

Check

IC801* Pin 1

Oscillation.

Check

IC801 Pin 3 B+.

Abnormal

Abnormal (0 ~ 15V)

Check/Replace

D806, Q401, Q801,

D802, D814*

Check and Replace

D807 ~D810

Abnormal

Abnormal (0V)

Normal (15~20V)

Check/Replace

PC802, DZ807

Check IC801*

Pin 4 Voltage

Check IC802.

Check/Replace

IC802, R812, D856.

ON

Abnormal

Normal (0.5 ~ 3V)

Check/Replace

DZ802, DZ803, D806

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Summary of Contents for CT21D8L6X

Page 1: ...HARGE from the electromaniacs com community You are free to distribute this file to other persons who needs it but without of charge Also on http electromaniacs com you can find thousands of service manuals schematics free of charge ...

Page 2: ... XAP COLOR TELEVISION RECEIVER CONTENTS Precautions Specifications Disassembly and Reassembly Alignment and Adjustments Troubleshooting Exploded Views and Parts List Electric Parts List Block Diagram PCB Layout Wiring Diagrams Schematic Diagrams 1 2 3 4 5 6 7 8 9 10 11 ...

Page 3: ... 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 4: ...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 5: ...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 6: ...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...

Page 7: ... A34KQV42X 20 A48KRD82X H 21 A51KQJ63X H Power Requirement AC 120V 60Hz AC 100 240 50Hz 60Hz Operating System REMOCON SYSTEM SZM354ET Tuning Ranges VHF CH 2 13 UHF CH 14 69 CABLE CH 1 14 125 Antenna Input Impedance 75 ohm UNBALANCED TYPE FOR VHF UHF Intermediate Frequency PICTURE 45 75MHz SOUND 41 25MHz COLOR SUB CARRIER 42 17MHz Speaker Impedance Single Dual 8 ohm 3W x 2 Dual 16 ohm 3W x 2 CT 33H...

Page 8: ...Disassembly and Reassembly Samsung Electronics 3 1 3 Disassembly and Reassembly 3 1 Back Cover Removeal Fig 3 1 1 After removing the screws pull the cabinet backwards ...

Page 9: ...g 3 3 1 Separate the socket board from the CRT neck 2 Remove the Anode Cap from the CRT 3 Remove the main board by pulling it with both hands Warning The FBT is charged with high voltage Before removing the Anode Cap discharge the voltage through one of the heat sinks on the main board ...

Page 10: ...Disassembly and Reassembly Samsung Electronics 3 3 3 3 Speaker Removal 1 Loosen the screws and remove the speakers Fig 3 4 ...

Page 11: ...e CRT to the front cabinet 3 Lift the CRT 4 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 face plate 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 12: ...let RC XXX VCO XX GC XXX SBT XX BC XX SCT XX VA XX SCR XX VS XX STT XXX HS XX GG XXX SS XX BG XXX SVC MUTE AGC XX AGC XX RC XXX GC XXX SBT XX BC XX SCT XX VA XX SCR XX VS XX STT XXX HS XX GG XXX SS XX BG XXX SVC MUTE VCO XX VCO 71 AGC XX XXX XXX XX XX XX VA XX XX VS XX XXX HS XX XXX SS XX XXX SVC MUTE VCO XX RC GC SBT BC SCT SCR STT GG BG ADJUSTMENT PATTERN OPTION RESET ADJUSTMENT PATTERN OPTION R...

Page 13: ...BYTE 0 0 0 ADJUSTMENT PATTERN OPTION RESET ADJUSTMENT PATTERN OPTION RESET ADJUSTMENT PATTERN OPTION RESET ADJUSTMENT PATTERN OPTION RESET ADJUSTMENT PATTERN OPTION RESET Initalized Alignment and Adjustments 4 2 Samsung Electronics 4 1 3 Adjustment in Option Mode This adjustment is necessary whenever the EEPROM is replaced Input data as marked on the back cabinet Select SET OPTION by pressing the ...

Page 14: ...final step in servicing 2 Turn the power switch ON and adjust customer controls for normal operation 3 Temporarily short pin X to pin R on the main board RX06 RX04 with a jumper wire Raster will disappear 4 The TV must remain in this state even after removing the jumper wire This shows that the failsafe circuit is working properly 5 To recover picture and sound temporarily turn off the TV and allo...

Page 15: ...with an oscilloscope 3 Adjust STT in the service mode until the 6th peak is the highest and the 5th and 7th peaks have equal heights 4 2 10 Sub Color Adjustment 1 Do sub color adjustment after the Sub Contrast and Sub Tint adjustments 2 D208 should still be shorted The ABL should still be switched OFF 3 Input a color bar pattern Use a pattern gen erator PM5518 4 Check CN201 R OUT use an oscillosco...

Page 16: ...put a high light pattern 2 Adjust GG BG in the Service Mode 3 Recheck in low light 4 2 12 Sub Brightness Adjustment 1 Input a Toshiba pattern 2 Warm up the receiver for 10 minutes 3 Enter the Service Mode and set SB to the point where the 5th point is brighter in the gray scale 4 2 13 Vertical Size Adjustment 1 Input a lion head pattern 2 After the vertical center adjustment enter into the service...

Page 17: ...MEMO 4 6 Samsung Electronics ...

Page 18: ...Power Check IC801 Pin 1 Oscillation Check IC801 Pin 3 B Abnormal Abnormal 0 15V Check Replace D806 Q401 Q801 D802 D814 Check and Replace D807 D810 Abnormal Abnormal 0V Normal 15 20V Check Replace PC802 DZ807 Check IC801 Pin 4 Voltage Check IC802 Check Replace IC802 R812 D856 ON Abnormal Normal 0 5 3V Check Replace DZ802 DZ803 D806 ...

Page 19: ...or CN601 and CN701 Check Waveform of IC601 Pin 1 Check Waveform of IC201 Pin 52 Check Waveform of IC201 Pin 1 Volume Up Check SIF L201 Check Replace IC201 Abnormal Check Waveform of IC601 and IC602 Pins 4 Check CN601 and CN701 Connector Soldering and A V PCB Check Voltage of IC601 and IC602 Pin 5 Check Power 12V Line Voltage Replace IC601 and IC602 O K NG Ok Normal ...

Page 20: ...mal Check Replace IC201 NG Single Horizontal Line Check 24V C Voltage Check Waveform of IC201 Pins 22 24 Normal O K Check Whether a horizontal line appears in the service mode Check Replace IC301 Check FBT Pin 2 24V Oscillation Normal NG Check R409 Open Check Replace R409 Open Check Replace FBT ...

Page 21: ...eck voltage line Check Micom IC901 Check tuner SCL SDA waveform Check tuner IF terminal waveform Check IC201 Pins 7 8 waveform Replace tuner Check whether AGC and AFTadjustment are normal in the service mode Check IC201 Pin 47 waveform level Check IC201 Pin 37 waveform level Readjust AGC and AFT Check IC201 Pin 41 waveform level Check IC201 Pin 43 waveform level Check IC201 Pins 19 20 21 waveform ...

Page 22: ...CLAMP WIRE NYLON 66 V2 NTR 15MM ALL MODE 1 1 8 AA64 01011B INDICATOR LED 29D8 ACRYL CLR 1 1 9 AA64 01426B WINDOW REMOCON 21D8 PC VOILET 1 1 10 6003 001026 SCREW TAPTITE RH B M4 L15 ZPC BLK SWR 1 WIN CF 1 11 AA64 01012B KNOB CONTROL 29D8 ABS G3676 SV 907P HB 1 1 12 6003 001026 SCREW TAPTITE RH B M4 L15 ZPC BLK SWR 1 KC CF 1 13 3001 000274 SPEAKER 5W 8ohm 90dB 160Hz 2 1 14 6003 001019 SCREW TAPTITE ...

Page 23: ... 9 AA64 40188A INDICATOR LED 5038 ACRYL 1 10 AA64 10050C KNOB CONTROL 5038 G3676 ABS HB GRAY 1 11 3001 001020 SPEAKER 3W 8ohm 90dB 140Hz 1 12 6003 001026 SCREW TAPTITE RH B M4 L15 ZPC BLK SWR 2 SPK CF 13 AA65 30107A CLAMP D COIL NYLON 66 V2 NTR 20 22 INC 4 14 AA60 10050R SCREW ASSY SWRCH18A M5 L31 5 HH WC 4 CRT CF 15 AA27 20003X COIL DEGAUSSING 20 14 4ohm 48T L2170 1 LC801S 16 AA03 10029W CRT COLO...

Page 24: ... 5 4 C151 2202 000127 C CERAMIC MLC AXIAL 10nF 80 20 25V Y5V 4 C153 2202 000127 C CERAMIC MLC AXIAL 10nF 80 20 25V Y5V 4 C201 2201 000292 C CERAMIC DISC 1nF 10 50V Y5P TP 5x3 5 4 C202 2401 001333 C AL 470nF 20 50V GP TP 5x11 5 4 C204 2301 000188 C FILM PEF 1nF 5 100V TP 10 5x12 5x6 5 4 C205 2401 001333 C AL 470nF 20 50V GP TP 5x11 5 4 C206 2305 001011 C FILM MPEF 22nF 5 100V TP 3 5x12 5x7 5 4 C207...

Page 25: ...O 35 4 D904 0401 000005 DIODE SWITCHING 1N4148 100V 200mA DO 35 4 D905 0403 000508 DIODE ZENER MTZJ5 6B 5 6V 5 45 5 73V 500 4 D906 0403 000508 DIODE ZENER MTZJ5 6B 5 6V 5 45 5 73V 500 4 D907 0401 000005 DIODE SWITCHING 1N4148 100V 200mA DO 35 4 DS602 0403 001325 DIODE ZENER MTZJ15C 14 35 15 09V 500mW D 4 DS603 0403 001325 DIODE ZENER MTZJ15C 14 35 15 09V 500mW D 4 DZ201 0403 001211 DIODE ZENER MTZ...

Page 26: ...666 R CARBON 33OHM 5 1 8W AA TP 1 8X3 2MM 4 R515 2002 001006 R COMPOSITION 4 7Kohm 5 1 2W AA TP 3 7x 4 R517 2001 000666 R CARBON 33OHM 5 1 8W AA TP 1 8X3 2MM 4 R518 2008 001015 R FUSIBLE S 1 5ohm 5 2W AF TP 3 9x10mm 4 R599 2008 001053 R FUSIBLE 22ohm 5 1 2W AF TP 2 5x6 5mm 4 R601 2001 000429 R CARBON 1KOHM 5 1 8W AA TP 1 8X3 2MM 4 R602 2001 000290 R CARBON 10KOHM 5 1 8W AA TP 1 8X3 2MM 4 R603 2004...

Page 27: ...RBON 2KOHM 5 1 8W AA TP 1 8X3 2MM 3 RA07 2001 000281 R CARBON 100OHM 5 1 8W AA TP 1 8X3 2MM 3 RA08 2001 000281 R CARBON 100OHM 5 1 8W AA TP 1 8X3 2MM 3 RA18 2001 000674 R CARBON 360OHM 5 1 8W AA TP 1 8X3 2MM 3 RA19 2001 000281 R CARBON 100OHM 5 1 8W AA TP 1 8X3 2MM ASSY PCB A V SIDE 1 AA95 01131A ASSY PCB A V SIDE 21D8 K15A NTSC 2 CE01 2401 000480 C AL 10uF 20 50V GP TP 5x11 5 2 CE02 2401 000480 C...

Page 28: ...hm NTSC 40 89 3 2011 001061 RC NETWORK 1 2Mohm 270pF 2 1 2W 2P REMOCON 1 AA59 00077A REMOCON TM59 SZM370PH 25 L GRAY SS E Electric Parts List 7 5 Loc No Code No Description Specification Remark Loc No Code No Description Specification Remark ...

Page 29: ...202 000632 C CERAMIC MLC AXIAL 100nF 20 50V Z5U TP 4 C210 2202 000632 C CERAMIC MLC AXIAL 100nF 20 50V Z5U TP 4 C211 2202 000632 C CERAMIC MLC AXIAL 100nF 20 50V Z5U TP 4 C212 2201 000982 C CERAMIC DISC 10nF 80 20 50V Y5V TP 4 4 C213 2201 000193 C CERAMIC DISC 0 01nF 0 25pF 50V NP0 TP 4 C214 2401 000660 C AL 2 2uF 20 50V GP TP 5x11 5 4 C215 2401 001840 C AL 100uF 20 16V GP TP 6 3x11 5 4 C218 2301 ...

Page 30: ...W D 4 DZ208 0403 001211 DIODE ZENER MTZJ12B 11 44 12 03V 500MW D 4 DZ209 0403 001211 DIODE ZENER MTZJ12B 11 44 12 03V 500MW D 4 DZ601 0403 000719 DIODE ZENER MTZJ7 5B 7 5V 7 07 7 45V 500 4 DZ602 0403 001327 DIODE ZENER MTZJ18A 16 22 17 06V 500mW D 4 DZ603 0403 001327 DIODE ZENER MTZJ18A 16 22 17 06V 500mW D 4 DZ802 0403 001327 DIODE ZENER MTZJ18A 16 22 17 06V 500mW D 4 DZ806 0403 001318 DIODE ZENE...

Page 31: ...CARBON S 470KOHM 5 1 2W AA TP 2 4X6 4 R802 2003 000994 R METAL OXIDE S 33Kohm 5 2W AF TP 3 9x 4 R803 2003 000994 R METAL OXIDE S 33Kohm 5 2W AF TP 3 9x 4 R807 2003 000994 R METAL OXIDE S 33Kohm 5 2W AF TP 3 9x 4 R808 2001 001150 R CARBON S 470KOHM 5 1 2W AA TP 2 4X6 4 R809 2008 000205 R FUSIBLE S 10ohm 5 1 2W AF TP 2 5x6 5 4 R811 2001 001170 R CARBON S 6 8OHM 5 1 2W AA TP 2 4X6 4 4 R812 2008 00025...

Page 32: ... BOSS WING HIPS HB NTR ASSY CABINET 1 AA90 00200G ASSY CABINET 5038 CT50386X XAP S N A 2 B C AA60 00091A SPACER FELT FELT 150X10 BLK T0 35 S N A 2 CB CF 6003 001026 SCREW TAPTITE RH B M4 L15 ZPC BLK SWR 2 CB RJ 6003 001026 SCREW TAPTITE RH B M4 L15 ZPC BLK SWR 2 CRT CF AA60 10050R SCREW ASSY SWRCH18A M5 L31 5 HH WC 2 PA CF 6006 001095 SCREW ASS Y TAPT WP BH M4 L12 ZPC YEL 2 AA65 30107A CLAMP D COI...

Page 33: ...7 10 Samsung Electronics MEMO ...

Page 34: ...TELH9 212A IC902 EEPROM KS24C020 IC901 MICOM SZM 354ET EXT IN VIDEO EXT IN AUDIO IC201 Q401 H TR KSC5368 VERTICAL AMP KA2131 T444 F B T 14 FSV14A001 20 FSV20A001 21 FSV20A001 IC802 MULTI REGULATOR KA7631 SWITCHING TRANS S 125V 12 5V T801 D807 D810 IC801 SPS CONTROL KA3SO680 KA3S0765 125V 12 5V MICOM 1CHIP 5V 9V I2C BUS PC802 PHOTO COULPER DUAL ...

Page 35: ...Samsung Electronics 10 1 CRT PCB B G R 9V GND 180V GND HT B G R 9V GND 180V GND HT CN501 CN201 A V ASSY V1 R R V0 GND AI CN702 CN701 A0 V1 R R V0 GND AI A0 S G SPEAKER CN601 MAIN ASSY CRT H1 H2 V1 V2 CN401 H1 H2 V1 V2 CRT PCB CN501 S G ...

Page 36: ...11 Schematic Diagrams 11 1 MAIN 1 4 Schematic Diagrams Samsung Electronics 11 1 Power Line Signal Line ...

Page 37: ... 32PIN TP16 TP18 TP12 TP20 IC201 41PIN IC201 45PIN IC201 49PIN IC201 28PIN TP9 IC201 24PIN TP4 TP5 IC201 20PIN IC201 19PIN TP6 IC201 21PIN TP1 TP2 IC201 4 PIN IC201 2 PIN TP3 IC201 7PIN Schematic Diagrams 11 2 Samsung Electronics TP9 TP10 TP13 TP14 TP15 TP16 TP17 TP18 TP21 TP19 TP20 TP1 TP2 TP3 TP4 TP5 TP6 TP7 TP8 TP11 TP12 11 2 MAIN 2 4 Power Line Signal Line ...

Page 38: ...Schematic Diagrams Samsung Electronics 11 3 TP25 TP27 TP26 TP24 11 3 MAIN 3 4 TP24 TP26 TP25 IC801 1 PIN TP27 T444 10 PIN Power Line Si l Li ...

Page 39: ...Schematic Diagrams 11 4 Samsung Electronics 11 4 MAIN 4 4 Power Line Signal Line ...

Page 40: ...ELECTRONICS Samsung Electronics Co Ltd APR 2001 Printed in Korea 3K15A 5001 ...

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