Samsung CT26F7SWX/XAP Service Manual Download Page 28 | Manualshive

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5-2

Samsung Electronics

5-2 No Video (Sound OK)

Troubleshooting

Nornal

Nornal

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Nornal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Abnormal

Check RK,GK,BK

Signal

Check R,G,B

Signal into CRT

PCB

Check the

resistance of R425

Check IC201S

Pin 49(BCL-IN)

Pin50(IK)

Check IC501

B+(180V-B)

Check the

Voltage of heater

Check

CRT and FBT

Check/Replace

D812,FBT

Re-Adjust

Screen Voltage

Replace

R425

Check

CRT and FBT

Check/Replace

IC201S

Check/Replace

R421,R422,D505

Check IC201S

Pin 51,52,53

(R.G.B)

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Summary of Contents for CT26F7SWX/XAP

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

Page 2: ...ELECTRONICS Samsung Electronics Co Ltd JULY 2002 Printed in Korea AA82 00088A ...

Page 3: ... the last step 2 If the EEPROM or CRT is replaced and set SC as 35 factory mode 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 DISPLAY FACTORY 2 STAND BY MUTE 1 8 2 POWER ON 2 The SERVICE FACTORY message will be displayed The Service Mode has four compo n...

Page 4: ...n Melody Sound Volume Ratio Pre overshoot Ratio Pre overshoot Window Selection Sound PLL IF AGC Speed Offset IF Demodulator Soft Clipping Level Peak White Limitting Matrix USA Automatic Gain Control Dynamic Skin Tone DVD Bright Offset MVOL RP00 RP01 FMWS AGC1 OMD SCL PWL MUS AGC DSK DVDB 15 8 35 32 40 30 42 30 31 20 32 35 11 3 0 2 1 20 3 35 10 12 7 1 1 0 1 32 3 15 0 33 0 5 16 6 37 33 38 30 39 32 3...

Page 5: ...GE HOTEL MODE BULE SCREEN 2 nd SIF V CHIP AV Option DEMO SETTING OFF STEREO OFF NOR ZOOM OFF ON ENGLISH OFF OFF INTERNAL ON AV DVD OFF Video Mute On Off changing the channel Audio Option Mono Steeo E W Option Picture Size Option Master S w Option Audio Mute On Off without signal Inital Language agter Factory Reset Hotel mode On Off Bule Screen On Off without signal SIF Option at Mono sound V CHIP ...

Page 6: ...d 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 upon installation The degaussing coil operates for about 1 sec ...

Page 7: ...lloscope probe 2 Input a gray scale pattern Use a pattern gen erator PM5518 3 Use the P mode key on the remote control for the STANDARD picture 4 Adjust the Screen VR on the FBT so that the voltage on the oscilloscope becomes 125 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 convergen...

Page 8: ...1m m Vertical Green Belt Fig 4 4 1 2 a Set up 1 Warm up the TV for at least 30 minutes in the Aging Mode OSD White This mode is dis played by entering the following sequence DISPLAY FACTORY FACTORY 2 Input a Toshiba pattern b Low Light Adjustment 1 Set SBT to 1 0 fL in the Factory Service Mode with using CA100 See Fig 4 4 2 Adjust RG BG so that the levels are suitable to each local area c High Lig...

Page 9: ...and the blue vertical lines in the center area of the screen 5 Turn the both tabs 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 l...

Page 10: ...on head circle becomes oval 3 Adjust with VA Vertical Amplitude so that the top margin of the picture is 4 Fig 4 7 4 Adjust with VSL Vertical Slope so that the bottom margin of the picture is 4 Fig 4 8 5 Adjust with HS Horizontal Shift so that the lion head pattern and CRT centers are aligned Fig 4 9 6 Adjust HS Horizontal Shift so that the left and right margins of the picture are 5 Alignment and...

Page 11: ...reassembly Samsung Electronics 3 1 3 Disassembly and Reassembly 3 1 Back Cover Removal 1 After removing the screws press the tension rib and pull the cabinet backwards 2 To reassemble press the tension rib see diagram ...

Page 12: ...cket 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 1 Remove the speaker by pressing the tension rib ...

Page 13: ...RT to the front cabi net Lift the CRT 3 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 14: ...3 4 Samsung Electronics MEMO ...

Page 15: ...10 ZP 4 SPK CF 1 8 6003 001026 SCREW TAPTITE RH B M4 L15 ZPC BLK SWR 4 CB CF 1 9 AA64 02304B CABINET BACK 26F6 HIPS HB G4309 1 B C 1 10 AA96 20129C ASSY POWER CORD EP2 YES H C200 ME301P 1 PWR AC 1 11 AA64 00892Y INLAY BACK PS SHEET 29F6 T0 3 K15C S T S 1 INLAYB 1 12 6003 001026 SCREW TAPTITE RH B M4 L15 ZPC BLK SWR 1 CB RCA 2 AA03 00157A CRT COLOR A63QDB891X 380MG SAMSUNG 1 CRT 2 1 AA65 00019A CLA...

Page 16: ...dle brackets 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 unit s 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 le...

Page 17: ...t appear 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 p...

Page 18: ...g and accessible 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 meg...

Page 19: ...n anti static solder removal device Many solder removal devices are not rated as anti static 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 are packaged with leads that are electrically shorted together by conductive foam aluminum foil or other conductive material...

Page 20: ...edance Speaker Impedance NTSC NTSC 2 13 14 69 45 75 41 25 42 18 System Band VHF UHF 1 125 CABLE SYSTEM IF Carrier Frequency Picture IF Carrier Sound IF Carrier Color Sub Carrier MODEL CT 20 Inch AC 120V 60Hz VHF UHF Telescopic dipole antenna 75 ohm unbalanced type 8 ohm 2W 2W Dual Type SYSTEM NTSC ONLY A51QDX991X001 20Inch FLAT 25 Inch A63QDB891X 25Inch 1 0R 380MG 29 Inch A68QDN891X001 29Inch 1 0R...

Page 21: ... IC202 24C04 EEPROM PC801S TCET1108 LTV817B PHOTO COUPLER SPM456AN TDA9377 English Spanish French IC201S Philips Philips Philips FIAIR CHILD VERTICAL OUTPUT LA7841 TDA7268 IC301 IC602 SOUND AMP 2W x 2CH IC801S KA5Q0740RT 0765RT POWER IC STR IC802 KA7632 CUSTOM REGULATOR 5V 8V 3 3V IC101 LA7510 SIF IC SANYO IC601 MSP3425G Sound Processor Micronas Sanyo SEC ...

Page 22: ...ectronics 2 3 ELECTROLYTIC CONDENSER IC DIODE SPM456AN Pin 64 U4468B Pin 16 MSP3425G Pin 52 IC TRANSISTOR LA7841 TDA6107Q KA7632 TRANSISTOR TRANSISTOR KSC5802 B C E E B C KSC815 Y KSA539 Y SAW FILTER E C B KSC2331 Y 1 1 1 M3953M M9261M Fig 2 1 Semiconductor Base Diagrams ...

Page 23: ...2 4 MEMO ...

Page 24: ...9 1 K15C Wiring Diagram CRT PCB 8 7 6 5 4 3 1 2 SOUND L IN SOUND R IN SOUND L OUT SOUND R OUT VIDEO IN GND VIDEO OUT GND 1 2 3 4 R OUT B OUT G OUT GND 9 8 5 7 6 GND IK GND HEAT B OUT CN501 CN601 CN701 4 3 2 1 R OUT L OUT R OUT L OUT POWER CORD ...

Page 25: ...9 2 MEMO ...

Page 26: ...40RT KA5Q0765RT S W MULTI REGULATOR 3 3V TO MCU 8V TO MCU I 2C AUDIO A M P TDA7268 F SOUND PROCESSOR MSP3425G BT 21 F 25 29 FQH 29A001 S VIDEO I 2C VIDEO SI F SA W M9261M LA7510 IC M C U SP M 456A N 2 3 2 4 21 22 50 53 2 3 45 48 38 42 2 41 42 30 31 R L OUT 24 25 STEREO 12 S W 2 1 R G B FB H OUT TR 3 3 16 5V TO Ver A M P 180V TO C RT Heat TO C RT 13V TO SOUND AMP 8R 2E A KA7632 KSC 5802 Option Q ...

Page 27: ... Abnormal Abnormal Abnormal Counect the Power code Check the X tal SDA SCL port of IC201S Check the 33 Pin H Drive of IC201S Check the 130V A Line Check the 3 3V A 8V A Line of IC201S Check Replace IC802 Replace IC201 S Check the FBT D805 D806 Check the 12 5V A Line Check the FD801S D807 IC801S or AC Fuse Check Replace Q401 ...

Page 28: ...ormal Abnormal Check RK GK BK Signal Check R G B Signal into CRT PCB Check the resistance of R425 Check IC201S Pin 49 BCL IN Pin50 IK Check IC501 B 180V B Check the Voltage of heater Check CRT and FBT Check Replace D812 FBT Re Adjust Screen Voltage Replace R425 Check CRT and FBT Check Replace IC201S Check Replace R421 R422 D505 Check IC201S Pin 51 52 53 R G B ...

Page 29: ...ire Check Replace IC601 Check B Line 5V B 8V B Check IC101 TUNER Check Replace IC201S See No Power Check IC101 TUNER Replace IC602 Replace IC610 R612 Replace FD801S D807 Check IC602 Pin2 7 Check IC601 Pin47 SIF Check IC601 B Check IC201S Pin32 SIF Check IC602 B Check R610 R612 Check FD801S D807 Abnormal Abnormal Abnormal Abnormal Abnormal Abnormal Abnormal Abnormal MONO STEREO ...

Page 30: ...lectronics Troubleshooting 5 4 Horizontal Lines Appear or Screen Normal Normal Abnormal Abnormal Check R304 R305 D301 D302 Check IC201S Check IC201S Pin 21 22 VDN VDP Check IC301 B 16V C 13 5V C Check Replace IC301 ...

Page 31: ...TP03 TP04 TP05 TP06 TP12 TP10 TP11 TP08 TP09 TP07 Schematic Diagrams 10 1 Samsung Electronics 10 Schematic Diagrams 10 1 MAIN 1 4 Power Line Signal Line TP01 TP02 TP04 TP05 TP07 TP08 TP10 TP11 TP03 TP06 TP09 TP12 ...

Page 32: ...Schematic Diagrams 10 2 Samsung Electronics 10 2 MAIN 2 4 TP01 TP02 TP04 TP03 TP05 TP01 TP02 Power Line Signal Line TP03 TP04 TP05 ...

Page 33: ...Schematic Diagrams 10 3 Samsung Electronics 10 3 MAIN 3 4 I N _ P U T 2 O U T _ P U T 2 CONT ROL INPUT VCC GND NC NC TP02 TP01 TP01 TP02 Power Line Signal Line ...

Page 34: ...Schematic Diagrams 10 4 Samsung Electronics 10 4 MAIN 4 4 ...

Page 35: ...0401 000005 DIODE 1N4148 100V 300mA 1V 8nS TAPING 4 D804 0401 000005 DIODE 1N4148 100V 300mA 1V 8nS TAPING 4 D808 0401 000005 DIODE 1N4148 100V 300mA 1V 8nS TAPING 4 D811 0401 000005 DIODE 1N4148 100V 300mA 1V 8nS TAPING 4 D501 0402 000254 DIODE RECTIFIER RGP10J 600V 1A DO 41 4 D401 0402 000493 DIODE RECTIFIER 1R5GU41 400V 1 4 D301 0402 000534 DIODE RECTIFIER RG10V 400V 1 5 4 D302 0402 000540 DIOD...

Page 36: ...M 5 1 2W AA T 4 R501H 2002 001009 R COMPOSITION 2 7KOHM 10 1 2W AA TP 3 7 4 R502H 2002 001009 R COMPOSITION 2 7KOHM 10 1 2W AA TP 3 7 4 R503 2002 001009 R COMPOSITION 2 7KOHM 10 1 2W AA TP 3 7 4 RP801S 2002 001010 R COMPOSITION 1 8MOHM 5 1 2W AA TP 3 7X 4 RY801S 2002 001012 R COMPOSITION 8 2MOhm 5 1 2W AA TP 3 7X 4 R402 2003 000540 R METALOXIDE S 1KOHM 5 2W AD 4 R407 2003 000586 R METALOXIDE S 22K...

Page 37: ...CTOR AXIAL 22UH 10 2 5X3 4 L205 2701 000159 INDUCTORAXIAL 22uH 10 4 2x9 8mm 4 L303 2701 000159 INDUCTORAXIAL 22uH 10 4 2x9 8mm 4 L304 2701 000159 INDUCTORAXIAL 22uH 10 4 2x9 8mm 4 L804 2701 001030 INDUCTOR AXIAL 43uH 10 14x4 5mm 4 L102 2702 000142 INDUCTOR RADIAL 22uH 5 6x6 4mm 4 L201 2702 000142 INDUCTOR RADIAL 22uH 5 6x6 4mm 4 X901 2801 003433 CRYSTAL UNIT 12MHZ 30PPM 28 AAM 30PF 30O 4 L402 2901...

Page 38: ...403 001373 DIODE ZENER MTZJ5 1A 4 81V 5 07V 500mW D 4 R422 2008 000206 R FUSIBLE S 1OHM 5 1 2W AF T 3 SOLVEN 0204 000442 SOLVENT CH3 CH5H CH396 IM 1000 3 SOLDER 0202 000008 SOLDER WIRE S63S D3 0 S63A D3 63 37 3 FLUX 0204 001024 FLUX DF 96TVS 20 3 SOLDER 0202 000187 SOLDER WIREFLUX RS60S D1 2 6 3 C505 2301 000108 C FILM PEF 1 5NF 5 50V 6 5X3 0X5 5MM 5M 3 A SOUN AA95 01591A ASSY SOUND TROJAN K15C ST...

Page 39: ...0MG SAMSUNG 2 C Y AA27 00002A MAGNET CONVERGENCE JH291 SC OB 29 1M 2 D COIL AA27 00219A COIL DEGAUSSING 25T 1 5OHM 25INCH 110V 2 D Y AA27 00027A DEFLECTION YOKE DSE2603AL 2 SPACER AA63 60028A SPACER DY NEOPRENE BLK V0W 2 CDCOIL AA65 00019A CLAMP CORE D COIL 25 34 NYLON 66 V2 NTR 2 A TBC AA98 70002D ASSY TBC WIRE P 25INCH NTSC 1P 25F6 T 2 T CRT 0203 001303 TAPE ACETATE 1554 T0 25 W19 L30000 WHT ASS...

Page 40: ...7 6 Samsung Electronics MEMO ...

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