Samsung KCT52A Training Manual
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Samsung KCT52A Training Manual

Samsung KCT52A Training Manual

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SAMSUNG GROUP
SAMSUNG GROUP
CTV Training Manual
KCT52A Chassis
20 Inch:
TXE2045, TXE2046
25 Inch:
TXE2545, TXE2546, TXE2549
27 Inch:
TXE2745, TXE2746, TXE2749
l
Samsung Electronics America
Product Support Department.
]
1

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Summary of Contents for Samsung KCT52A

  • Page 1 SAMSUNG GROUP SAMSUNG GROUP CTV Training Manual KCT52A Chassis 20 Inch: TXE2045, TXE2046 25 Inch: TXE2545, TXE2546, TXE2549 27 Inch: TXE2745, TXE2746, TXE2749 Samsung Electronics America Product Support Department.

  • Page 2: Table Of Contents

    SAMSUNG GROUP SAMSUNG GROUP Contents Vertical Deflection Circuit Vertical Deflection Circuit Description Block Diagrams Troubleshooting – No Vertical Scan (Horizontal Line) Power Supply Circuit Sound Circuit IC Block Diagram & Pin Description IC Block Diagram & Description IC Pin Voltage & Waveforms Troubleshooting –...

  • Page 3: Block Diagrams

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Block Diagrams...

  • Page 4: Power Supply Circuit

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Power Supply Circuit...
  • Page 5 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Power Supply Circuit...

  • Page 6: Ic Block Diagram & Pin Description

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC Block Diagram & Pin Description IC801 (STRS6709) Block Diagram IC801 (STRS6709) Pin Description Pin No Pin Name Description IC801 (STRS6709) Internal Parameter Collector Switching TR Collector T-on trimming 3300 pF Switching TR Emitter T-off trimming 0.01 uF...

  • Page 7: Ic Pin Voltage & Waveforms

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC Pin Voltage & Waveforms IC801 Pin Voltage & Waveform HC802 Pin Voltage & Waveform Pin No Stand-by Power On Pin No Stand-by Power On See printout See printout See printout See printout 11.1 V 12.5 V...
  • Page 8 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC Pin Voltage & Waveforms HC853 Pin Voltage & Waveform Pin No Stand-by Power On IC852 Pin Voltage & Waveform 12.9 V 13.7 V Pin No Stand-by Power On 0.6 V 11.8 V 37 V 129 V 3.8 V...

  • Page 9: Power Supply Description

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Power Supply Description Start up Circuit When AC cord is plugged in, the initial current starts flowing through the path as shown, and charges C852. When Vin reaches about 8V, the control circuit is activated, and the oscillation begins.
  • Page 10 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Power Supply Description On-Time Control Circuit Description The oscillator generates driving pulses to turn PTR on/off by charging and discharging C1 and C2. Refer to the waveform shown below, left. When the PTR is on, C2 is charged to the constant voltage.
  • Page 11 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Power Supply Description Off-Time Control Circuit Description The INH voltage is used as the input signal to the COMP1 and COMP2 within the control IC. Fig. 1 When INH voltage reaches Vth1, the OSC output is kept low, so PTR maintains off mode.
  • Page 12 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Power Supply Description PTR Drive Circuit Description The control IC uses a proportional drive system to reduce the PTR ON loss, saturation loss, and storage time loss. When Proprot. drive circuit generates a positive pulse out of Pin 5, the base current to Pin 3 (base of PTR) develops, and increases linearly because of R813 and C851 combination.
  • Page 13 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Power Supply Description OCP (Over Current Protection) Circuit Description) The overcurrent protection is performed by the pulse-by-pulse system, which directly detects the collector current of the PTR. The detect reference voltage to the comparator is set to -1 V...
  • Page 14 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Power Supply Description Over Voltage Protection Circuit Description Latch Circuit Description The overvoltage protection circuit activates the latch circuit The latch circuit stops oscillation of the control IC when OVP when the Vin voltage exceeds about 11V.
  • Page 15 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) IC801 PIN 1 (POWER ON) IC801 PIN 2 (POWER ON) IC801 PIN 3 (POWER ON) IC801 PIN 4...
  • Page 16 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) IC801 PIN 5 (POWER ON) IC801 PIN 6 (POWER ON) IC801 PIN 7 (POWER ON) IC801 PIN 8...
  • Page 17 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) IC801 PIN 9 (STAND-BY) IC801 PIN 1 (STAND-BY) IC801 PIN 2 (STAND-BY) IC801 PIN 3...
  • Page 18 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) IC801 PIN 4 (STAND-BY) IC801 PIN 5 (STAND-BY) IC801 PIN 6 (STAND-BY) IC801 PIN 7...
  • Page 19 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) IC801 PIN 8 (STAND-BY) IC801 PIN 9 (POWER ON) IIC801 PIN 1 (POWER ON) IIC801 PIN 2...
  • Page 20 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) IIC801 PIN 3 (POWER ON) IIC801 PIN 5 (STAND-BY) IIC801 PIN 1 (STAND-BY) IIC801 PIN 2...
  • Page 21 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (STAND-BY) IIC801 PIN 3 (STAND-BY) IIC801 PIN 5 (POWER ON) Q801 B (POWER ON) Q801 C...
  • Page 22 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) Q801 E (STAND-BY) Q801 B (STAND-BY) Q801 C (STAND-BY) Q801 E...
  • Page 23 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) IC851 C (POWER ON) IC851 E (STAND-BY) IC851 C (STAND-BY) IC851 E...
  • Page 24 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) DZ803 (STNAD-BY) DZ803...
  • Page 25 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) T801 PIN 4 (POWER ON) T801 PIN 6 (POWER ON) T801 PIN 7 (POWER ON) T801 PIN 8...
  • Page 26 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) POINT A (POWER ON) POINT B (POWER ON) POINT C...
  • Page 27 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (POWER ON) POINT D (STAND-BY) T801 PIN4 (STAND-BY) T801 PIN 6 (STAND-BY) T801 PIN7...
  • Page 28 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (STAND-BY) T801 PIN 8 (STAND-BY) POINT A (STAND-BY) POINT B...
  • Page 29 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis (STAND-BY) POINT C (STAND-BY) POINT D...

  • Page 30: Troubleshooting: No Raster And No Sound

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Troubleshooting: No Raster and No Sound...

  • Page 31: Micom Circuit

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Micom Circuit...

  • Page 32: Ic Pin Description

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC Pin Description Micom (IC901) Pin Description EEPROM (IC902) Pin Description Pin No Pin Name In/Out Description Pin No Pin Name In/Out Description OSD-CONTRAST OUTPUT OSD Contrast level adjustment A0 ~ A2 Input Address Inputs...

  • Page 33: Ic Pin Voltage & Waveforms

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC Pin Voltage & Waveforms Micom (IC901) Pin Description...
  • Page 34 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis MICOM PIN 2 (P.std:Movies) MICOM PIN 9 (No Key Pressed) MICOM PIN 10 (STAND-BY) T801 PIN 22~24 (No key pressed) (Menu key pressed)
  • Page 35 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis MICOM PIN 26 MICOM PIN 27 MICOM PIN 28 MICOM PIN 31...
  • Page 36 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis MICOM PIN 32 MICOM PIN 36 (Mute key pressed) MICOM PIN 41, 42...

  • Page 37: Tuner Circuit

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Tuner Circuit...

  • Page 38: Tuner Description

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Tuner Description TU01 TECC1080PA25A Tuner Band change-over system: PLL control system Tuning system: Electronic tuning system with PLL Voltage & Current at each terminal Terminal Supply Voltage Operation Guaranteed Voltage Current 12 +/– 0.1 V 12 +/–...
  • Page 39 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis POINT A POINT B POINT C POINT D...

  • Page 40: If/Chroma/Video Circuit

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IF/Chroma/Video Circuit...
  • Page 41 SAMSUNG GROUP SAMSUNG GROUP IF/Chroma/Video circuit...

  • Page 42: Ic Pin Description

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC Pin Description TDA8377 (IC201) Pin Description Pin No Pin Name Description SOUND IF INPUT 4.5 Mhz SIF signal input (1m Vrms max.) EXT AUDIO INPUT External Audio input VCO REF FILTER IF VCO tuning filter (2 X IF carrier freq.)
  • Page 43 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC Pin Description TDA8377 (IC201) Pin Description (continued) Pin No Pin Name Description X-TAL (3.58) 3.58 Mhz oscillation for chroma processing X-TAL (3.58/4.43) LOOP FILTER BURST Loop output response stabilization PHASE DET Power supply...

  • Page 44: Ic Pin Voltage & Waveforms

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC Pin Voltage & Waveforms TDA8377 (IC201) Pin Voltage & Waveforms Pin No Pin Name Voltage & Waveforms SOUND IF INPUT See print out EXT AUDIO INPUT 3, 4 VCO REF FILTER See print out...
  • Page 45 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC Pin Voltage & Waveforms TDA8377 (IC201) Pin Voltage & Waveforms (continued) Pin No Pin Name Voltage & Waveforms CVBS OUTPUT See print out BLACK PEAK HOLD 3.9 V H-OUT See print out SANDCASTLE OUTPUT FLYBACK See print out...
  • Page 46 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC201 PIN 3,4 IC201 PIN 5 IC201 PIN 6 IC201 PIN 7...
  • Page 47 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC201 PIN 8 IC201 PIN 10 IC201 PIN 11 IC201 PIN 13...
  • Page 48 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC201 PIN 18 IC201 PIN 20 IC201 PIN 26 IC201 PIN 27...
  • Page 49 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC201 PIN 28 IC201 PIN 34 IC201 PIN 38 IC201 PIN 48, 49...

  • Page 50: Troubleshooting - No Color

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Troubleshooting – No Color...

  • Page 51: Horizontal Deflection Circuit

    SAMSUNG GROUP SAMSUNG GROUP Horizontal Deflection Circuit...

  • Page 52: Horizontal Deflection Circuit Description

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Horizontal Deflection Circuit Description 20/25 Horizontal Deflection Circuit Deflection current waveform...
  • Page 53 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Horizontal Deflection Circuit Description 27 Inch Horizontal Deflection Circuit * QE01 C-E Resistance is controlled by DC current & Parabola voltage in vertical deflection time from EastWest Amp output in IC301...
  • Page 54 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis ACQUISITION MODE: PEAK DETECT ACQUISITION MODE: PEAK DETECT POINT A POINT B ACQUISITION MODE: PEAK DETECT ACQUISITION MODE: PEAK DETECT POINT C POINT E...
  • Page 55 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis ACQUISITION MODE: PEAK DETECT ACQUISITION MODE: PEAK DETECT POINT D POINT F ACQUISITION MODE: PEAK DETECT POINT G...
  • Page 56 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC301 PIN 11 IC301 PIN 12 ACQUISITION MODE: PEAK DETECT IC201 PIN 45...
  • Page 57 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis ACQUISITION MODE: PEAK DETECT ACQUISITION MODE: PEAK DETECT IC201 PIN 40 IC201 PIN 41 ACQUISITION MODE: PEAK DETECT ACQUISITION MODE: PEAK DETECT IC201 PIN 42 IC201 PIN 43...

  • Page 58: Vertical Deflection Circuit

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Vertical Deflection Circuit...

  • Page 59: Vertical Deflection Circuit Description

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Vertical Deflection Circuit Description PIN Description TDA8350Q TDA8356 Description IC301 TDA8450Q(25/27Inch Only) Pin 1, 2 Pin 1, 2 Input Power Stage Pin 3 Pin 9 Feedback Voltage Pin 4 Pin 3 Operating Supply Voltage...
  • Page 60 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC301 PIN 1 IC301 PIN 3 IC301 PIN 4 IC301 PIN 5...
  • Page 61 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC301 PIN 8 IC301 PIN 9 IC301 PIN 10...
  • Page 62 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC201 PIN 46 IC201 PIN 47 IC201 PIN 51...
  • Page 63 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC201 PIN 47 (VS:0) IC201 PIN 47 (VA:0) IC201 PIN 47 (VS:63) IC201 PIN 47 (VA:63)

  • Page 64: Troubleshooting: No Vertical Scan (Horizontal Line)

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Troubleshooting: No Vertical Scan (Horizontal Line)

  • Page 65: Sound Circuit

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Sound Circuit...

  • Page 66: Ic Block Diagram & Description

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC Block Diagram & Description IC602 UPC 1853 Description MTS Module Terminal Description IC 601 TDA 7266 Description...
  • Page 67 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis MTS MODULE PIN 7 MTS MODULE PIN 1,2 IC602 PIN 13, 14 IC602 26,27,29.30...
  • Page 68 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC601 PIN 1,2 IC601 PIN 4,5 IC601 PIN 12 IC601 PIN 14, 15...
  • Page 69 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC202 PIN 6 IC202 PIN 1, 2 IC201 PIN 1 IC201 PIN 55...

  • Page 70: Troubleshooting: No Sound

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Troubleshooting: No Sound...

  • Page 71: Crt Drive Circuit

    SAMSUNG GROUP SAMSUNG GROUP CRT Drive Circuit...

  • Page 72: Crt Drive Circuit Description

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis CRT Drive Circuit Description IC501 TDA61010 Block Diagram IC501 TDA61010 Pin Description Pin No. Pin Name Description Non-Inverting votage Input (3V) Vddl Supply voltage low (12V) Inverting voltage input Ground, substrate’ Black current measurement output...
  • Page 73 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis B-OUT IC501 PIN 3 IC501 PIN 5...
  • Page 74 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis IC501 PIN 7 IC501 PIN 8 IC501 PIN 9...

  • Page 75: Troubleshooting: No Raster (Sound Ok)

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Troubleshooting: No Raster (Sound OK)

  • Page 76: A/V Switching Description

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis A/V Switching Description...

  • Page 77: Pip Block Diagram

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis PIP Block Diagram...

  • Page 78: Schematic Diagram

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Schematic Diagram...

  • Page 79: Pip Principle Sync Timing Diagrams

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis PIP Principle Sync Timing Diagrams Fig. 7-5 Sampling Format Fig. 7-7 PIP Dipslay in Main Picture Fig. 7-6 Timing Waveforms...

  • Page 80: Alignment And Adjustment

    The set must be in Factory ('Service") Mode. Selection 3-1 Preadjustment sequence: STAND-BY –– MUTE––1––8––2––POWER Since there are no VRs in the KCT52A chassis,all adjustments after parts replacement must be done VIA the Service Mode. The "FACTORY MODE" message will be displayed.
  • Page 81 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis 3-2-1 Adjustment Selection sequence: STANDBY –– MUTE –– 1–– 8 ––2 –– POWER ON Example: Sub-bright Adjustment (see to the right)
  • Page 82 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Main Adjustment Parameter 3.2.2 Test pattern (Aging Mode) Function RANGE DATA This mode can be used during servicing, or for confirm- Auto Gain Control 0~63 ing that the convergence and purity adjustments are cor-...
  • Page 83 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis 3-2-3 Set Option Byte Values Expressed in Hexadecimal Numbers In the Service Mode, various options can be selected VIA the Option Bytes; Example: BYTE 0 : 00 BYTE 1 : 00 FOR PIP MODEL...

  • Page 84: Factory (Service) Mode

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis 3.2.4 Factory Reset When "Factory Reset" is selected, the User-Control data reverts to the initial values. : The User-Control data is available at MENU (picture, sound and the other functions etc.) Note:When "Factory Reset" is selected,the Factory Mode Data does not change.

  • Page 85: 3.3 Other Adjustments

    SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis 3.3 Other Adjustments 3.3.1 General Usually, a color TV needs only slight touch-up adjustment upon installation Check the basic characteristics such as height, horizontal and vertical sync and focus. Observe the picture for good black and white details. There should be no objectionable color shading. If color shading is present, perform the purity and convergence adjustments described below.
  • Page 86 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis 3-3-2 Automatic Degaussing 3-3-3 High Voltage Check A degaussing coil is mounted around the picture tube, so CAUTION: There is no high voltage adjustment on this chas- external degaussing after moving the TV should be unneces- sis.
  • Page 87 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis 3.3.4 FOCUS Adjustment 3-3-6 F/S (Fail Safe) Circuit Check Input a black and white signal. The failsafe circuit check is the final step after servic- ing. Adjust the tuning control for the clearest picture.
  • Page 88 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis 3.3.7 Color Purity Adjustment Warm up the receiver. Operate it for 20 minutes, with the Brightness control set to maximum. Fully degauss the receiver. Use an external degaussing coil. Roughly adjust convergence by rotating the convergence magnet.
  • Page 89 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis Fig 3.2 Purity and Convergence Magnets...
  • Page 90 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis 3-3-8 Center Convergence Adjustment Note: Before attempting any convergence adjustment, make sure that the receiver has been powered ON for at least twenty minutes. Input a crosshatch pattern from a color bar generator. Adjust the Brightness and Contrast controls for a well defined pattern.
  • Page 91 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis 3-3-9 AGC Adjustment Input a COLOR-BAR pattern. (CH2) Set the RF input signal to 70DBuV. Use Generator for PM5518 & PM5418. Set AGC (in the Factory Mode) so that the DC level of IC TDA8377 Pin 33 is 3.2 (=0.05)V.
  • Page 92 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis 3-3-11 White Balance Adjustment 3-3-11 (D) SUB-BRIGHTNESS ADJUSTMENT Input a TOSHIBA pattern. Set SBT so that the brightness level in low-light is 3-3-11 (A) SCREEN ADJUSTMENTS 1.0F/L Input a TOSHIBA pattern. Check R506 "G" pin on the CRT PCB with an oscillos- cope.
  • Page 93 SAMSUNG GROUP SAMSUNG GROUP KCT52A Chassis 3-3-11 (F) SUB-TINT ADJUSTMENT Set "STT" in the Service Mode to step 2. 3-3-11 (G)VERTICAL SIZE ADJUSTMENT Input a lion head Pattern. Set "VS" to 32 in the Factory Mode. Set, "VA" so that the top margin is 4.0. Adjust "VSL" so that the bottom mm-gin is 4.0. If the top and bottom margins are different, adjust "VA"...

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