Samsung CT20F3FNT Service Manual Download Page 12 | Manualshive

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Disassembly and reassembly

3-2

Samsung Electronics

3-2 Main Board Removal

3-3 Speaker Removal

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.

1. Remove the speaker by

pressing the tension rib.

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Summary of Contents for CT20F3FNT

Page 1: ...ignment and Adjustments Troubleshooting Exploded View and Parts List Electrical Part List Block Diagram Wiring Diagram Schematic Diagrams 1 2 3 4 5 6 7 8 9 10 COLOR TELEVISION RECEIVER Chassis K15D N Model CT20F3FNT XAP SERVICE Manual COLOR TELEVISION RECEIVER CONTENTS ...

Page 2: ...l is a property of Samsung Electronics Co Ltd Any unauthorized use of Manual can be punished under applicable International and or domestic law Samsung Electronics Co Ltd MAY 2004 Printed in Korea AA82 01689A ELECTRONICS ...

Page 3: ...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 4: ...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 5: ...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 6: ...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 7: ... Input Impedance 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 14 Inch AC 120V 60Hz VHF UHF Telescopic dipole antenna 75 ohm unbalanced type 8 ohm SYSTEM NTSC ONLY A34KQV42X 14Inch 15 Inch A36QDT351X 15Inch Flat 20 Inch A48KRD82X 20Inch 21 Inch A51KQJ63X 21Inch ...

Page 8: ...2 24C04 EEPROM PC801S TCET1108 LTV817B PHOTO COUPLER SPM458AN TDA9377 English Spanish French IC201S Philips Philips Philips FIAIR CHILD VERTICAL OUTPUT LA7840 TDA7266M TDA7266S SOUND AMP IC301 IC602 TDA7266M MONO TDA7266S STEREO IC801S KA5Q0740RT 0765RT POWER IC STR IC802 KA7632 CUSTOM REGULATOR 5V 8V 3 3V ICS601 UPC1851B Sound Processor STEREO NEC Sanyo SEC ...

Page 9: ...g Electronics 2 3 ELECTROLYTIC CONDENSER IC DIODE SPM458AN Pin 64 U4468B Pin 16 UPC851B Pin 42 IC TRANSISTOR LA7840 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 M1864M Fig 2 1 Semiconductor Base Diagrams ...

Page 10: ...2 4 MEMO ...

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: ...PC BLK SWR 1 T0081 S N A 1 9 AA64 03007A KNOB CONTROL 14F3 ABS HB G3676 SVM 3012 1 T0022 S N A 1 10 6002 000512 SCREW TAPPING RH 2 M4 L12 ZPC BLK SWR 1 T0081 S N A 1 11 AA96 10007A ASSY SPEAKER 8ohm 3W O5F14BRA L300 1 T0522 S N A 1 12 6002 000512 SCREW TAPPING RH 2 M4 L12 ZPC BLK SWR 4 T0081 S N A 2 AA03 00246A CRT COLOR A48KRD82X H 380MG 2 20MH 30 0 1 T0063 2 1 AA61 00734A HOLDER 25POLYVINYL DEGA...

Page 16: ...e the last step 2 If the EEPROM or CRT is replaced and set SC as 20 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 ...

Page 17: ...o 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 HBS 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 32 1 32 3 35 10 12 32 1 1 0 1 32 3 15 0 33 0 5 13 9 31 27 32 25 31 31 31 40 30 20 11 7 0 37 1 32...

Page 18: ... ON OFF OFF ON ENGLISH ESPANOL FRENCH PORTU OFF ON AIR STD HRC IRC AIR STD HRC AFN ON OFF ON OFF TV AV TV AV DVD ON OFF 800msec Mute Time Tri norma Unavailable Zenith stereo WITH IN UPC1851B Line stereo WITH IN UPC1851B Mono WITH OUT UPC1851B Stereo L STEREO Model Mono Model Nornal Zoom Nomal The power is switched on automatically when detaching the Master S W Auto On Tact S W Model Unavailable Av...

Page 19: ...quency as specified on the backcover nameplate 7 Do not attempt 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...

Page 20: ...illoscope 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 converge...

Page 21: ... 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 2 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 Light...

Page 22: ...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 23: ...o that the lion 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 ...

Page 24: ...N A 4 0205 001153 GREASE SILICON SC102 JAPAN S N A 4 T0088 1204 001483 IC VERTICAL PROCESSO LA7840 SIP 7P 708MI 4 T0081 6003 000335 SCREW TAPTITE RH 2S M3 L8 ZPC YEL SWR S N A 4 AA62 00046A HEAT SINK PS T1 0 D1 DREAM 60X25X S N A 3 IC601 AA96 00244D ASSY H S SOUND AA62 00046A TDA7266M S N A 4 0205 001153 GREASE SILICON SC102 JAPAN S N A 4 T0085 1201 001600 IC AUDIO AMP 7266 ZSIP 15P SINGLE 26dB 4 ...

Page 25: ...5 2001 000449 R CARBON 2 2KOHM 5 1 8W AA TP 1 8X3 2MM 4 R125 2001 000472 R CARBON 2 7KOHM 5 1 8W AA TP 1 8X3 2MM 4 R125 2001 000472 R CARBON 2 7KOHM 5 1 8W AA TP 1 8X3 2MM 4 R125 2001 000472 R CARBON 2 7KOHM 5 1 8W AA TP 1 8X3 2MM 4 R125 2001 000472 R CARBON 2 7KOHM 5 1 8W AA TP 1 8X3 2MM 4 R125 2001 000472 R CARBON 2 7KOHM 5 1 8W AA TP 1 8X3 2MM 4 R125 2001 000490 R CARBON 200OHM 5 1 8W AA TP 1 8...

Page 26: ...CTOR AXIAL 1UH 10 2534 4 L102 2701 000159 INDUCTOR AXIAL 22UH 10 4298 4 L201 2701 000159 INDUCTOR AXIAL 22UH 10 4298 4 L230 2701 000159 INDUCTOR AXIAL 22UH 10 4298 4 L405 2701 000159 INDUCTOR AXIAL 22UH 10 4298 4 L902 2701 000177 INDUCTOR AXIAL 33UH 10 2534 4 L904 2701 000177 INDUCTOR AXIAL 33UH 10 2534 4 L804 2701 001030 INDUCTOR AXIAL 43UH 10 4514 4 L807 2701 001030 INDUCTOR AXIAL 43UH 10 4514 4...

Page 27: ...D S N A 2 T0511 AA68 02666A MANUAL USERS SPA W P100 G B5 K15D S N A 2 BAG PE AA69 01195A BAG PE CL29A6W8X HDPET0 012 93 4X151 2 S N A ASSY P MATERIAL 1 A PACK AA92 07233B ASSY P MATERIAL CT20F3FX XAX S N A 2 PE BAG AA69 01208A BAG SHEET 19 20 W42 L50 FOAM OEM S N A 2 T0214 AA60 40006A PIN STAPLE AUTO 33X17 8X2 4 H18 33X17 8X S N A Samsung Electronics 7 4 Electrical Parts List Level Loc No Code No ...

Page 28: ...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 122 5V A Line Check the 3 3V A 5V 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 29: ...ormal Abnormal Check RK GK BK Signal Check R G B Signal into CRT PCB Check the resistance of R420 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 R420 Check CRT and FBT Check Replace IC201S Check Replace R421 R422 D505 Check IC201S Pin 51 52 53 R G B ...

Page 30: ...eaker and Wire Check Replace ICS601 Check IC201S TUNER Check Replace IC201S See No Power Check TUNER Replace IC601 Replace Check IC601 Replace FD801S D807 Check IC601 Pin1 2 14 15 Check IC201S Pin28 MIS Check ICS601 B SDA SCL Check IC201S Pin28 Check IC601 B Check R608 R609 Check FD801S D807 Abnormal Abnormal Abnormal Abnormal Abnormal Abnormal Abnormal MONO STEREO ...

Page 31: ...Electronics Troubleshooting 5 4 Vertical 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 32: ... 6107 E 2PR OM 24C04 AC KA5Q0740RT KA5Q0765RT S W MULTI REGULATOR 3 3V TO MCU 8V TO MCU I 2C AUDIO A M P TDA7266M S F STEREO SOUND PROCESSOR UPD1851B BT FSV 14A004C VIDEO I 2C IC M C U SP M 458A N 2 3 2 4 21 22 50 53 2 3 4 44 2 38 39 R L OUT 24 25 STEREO MONO 12 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 2EA 8R 1EA KA7632 KSC 5386 Q ...

Page 33: ...TP06 TP05 TP04 TP02 TP03 TP01 Schematic Diagrams 10 1 Samsung Electronics 10 Schematic Diagrams 10 1 MAIN 1 4 TP01 TP02 TP03 TP04 TP05 TP06 ...

Page 34: ...Schematic Diagrams 10 2 Samsung Electronics 10 2 MAIN 2 4 TP08 TP07 TP11 TP10 TP09 TP07 TP08 TP09 TP10 TP11 ...

Page 35: ...Schematic Diagrams 10 3 Samsung Electronics 10 3 MAIN 3 4 TP08 TP07 TP07 TP08 Power Line Signal Line ...

Page 36: ...Schematic Diagrams 10 4 Samsung Electronics 10 4 MAIN 4 4 ...

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