SAMSUNG CK6202X3XBWT Service Manual

COLOR TELEVISION RECEIVER

Chassis : S51A

Model: CK6202X3S/NWT

CK6202X3X/BWT

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

ELECTRONICS

©Samsung Electronics Co., Ltd. FEB.1999 Printed in Korea

3S51A-0205

Precautions

1. Precautions

Follow these safety, servicing and ESD precautions to prevent damage and protect against potential hazards such as electrical shock and X-rays.

1-1 Safety Precautions

1.Be sure that all of the built-in protective devices are replaced. Restore any missing protective shields.

2.When reinstalling the chassis and its assemblies, be sure to restore all protective devices, including: nonmetallic control knobs and compartment covers.

3.Make sure that there are no cabinet openings through which people—particularly children—might insert fingers and contact dangerous voltages. Such openings include the spacing between the picture tube and the cabinet mask, excessively wide cabinet ventilation slots, and improperly fitted back covers.

If the measured resistance is less than 1.0 megohm or greater than 5.2 megohms, an abnormality exists that must be corrected before the unit is returned to the customer.

4.Leakage Current Hot Check (Figure 1-1): Warning: Do not use an isolation transformer during this test. Use a leakagecurrent tester or a metering system that complies with American National Standards Institute (ANIS C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7).

5.With the unit completely reassembled, plug the AC line cord directly into the power outlet. With the unit’s AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: antennas, handle brackets, metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the powerplug prongs in the AC outlet and repeat the test.

									(READING SHOULD
						LEAKAGE			NOT BE ABOVE
DEVICE						CURRENT				0.5mA)
UNDER						TESTER
TEST
		TEST ALL
	EXPOSED METAL
		SURFACES
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER											EARTH
PLUG AS REQUIRED)										GROUND

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 lead to the coaxial connector.

7.X-ray Limits:

The picture tube is especially designed to prohibit X-ray emissions. To ensure continued X-ray protection, replace the picture tube only with one that is the same type as the original. Carefully reinstall the picture tube shields and mounting hardware; these also provide X-ray protection.

8.High Voltage Limits:

High voltage must be measured each time servicing is done on the B+, horizontal deflection or high voltage circuits. Correct operation of the X-ray protection circuits must be reconfirmed whenever they are serviced. (X-ray protection circuits also may be called “horizontal disable” or “hold-down”.)

Heed the high voltage limits. These include the X–ray Protection Specifications Label, and the Product Safety and X-ray Warning Note on the service data schematic.

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Precautions

1-1 Safety Precautions (Continued)

9.High voltage is maintained within specified limits by close-tolerance, safety-related components and adjustments. If the high voltage exceeds the specified limits, check each of the special components.

10.Design Alteration Warning:

Never alter or add to the mechanical or electrical design of this unit. Example: Do not add auxiliary audio or video connectors. Such alterations might create a safety hazard. Also, any design changes or additions will void the manufacturer’s warranty.

11.Hot Chassis Warning:

Some TV receiver chassis are electrically connected directly to one conductor of the AC power cord. If an isolation transformer is not used, these units may be safely serviced only if the AC power plug is inserted so that the chassis is connected to the ground side of the AC source.

To confirm that the AC power plug is inserted correctly, do the following: Using an AC voltmeter, measure the voltage between the chassis and a known earth ground. If the reading is greater than 1.0V, remove the AC power plug, reverse its polarity and reinsert. Re-measure the voltage between the chassis and ground.

12.Some TV chassis are designed to operate with 85 volts AC between chassis and ground, regardless of the AC plug polarity. These units can be safely serviced only if an isolation transformer inserted between the receiver and the power source.

13.Some TV chassis have a secondary ground system in addition to the main chassis ground. This secondary ground system is not

isolated from the AC power line. The two ground systems are electrically separated by insulating material that must not be defeated or altered.

14.Components, parts and wiring that 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 overheating, 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-place, or frayed wiring. Do not change the spacing between components and the printed circuit board. Check the AC power cord for damage. Make sure that leads and components do not touch thermally hot parts.

16.Picture Tube Implosion Warning:

The picture tube in this receiver employs “integral implosion” protection. To ensure continued implosion protection, make sure that the replacement picture tube is the same as the original.

17.Do not remove, install or handle the picture tube without first putting on shatterproof goggles equipped with side shields. Never handle the picture tube by its neck. Some “in-line” picture tubes are equipped with a permanently attached deflection yoke; do not try to remove such “permanently attached” yokes from the picture tube.

18.Product Safety Notice:

Some electrical and mechanical parts have special safety-related characteristics which might not be obvious from visual inspection. These safety features and the protection they give might be lost if the replacement component differs from the original—even if the replacement is rated for higher voltage, wattage, etc.

Components that are critical for safety are indicated in the circuit diagram by shading,

( ) or ( ! ).

Use replacement components that have the same ratings, especially for flame resistance and dielectric strength specifications.

A replacement part that does not have the same safety characteristics as the original might create shock, fire or other hazards.

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Precautions

1-2 Servicing Precautions

Warning1: First read the “Safety Precautions” section of this manual. If some unforeseen circumstance creates a conflict between the servicing and safety precautions, always follow the safety precautions.

Warning2: An electrolytic capacitor installed with the wrong polarity might explode.

1.Servicing precautions are printed on the cabinet. Follow them.

2.Always unplug the unit’s AC power cord from the AC power source before attempting to: (a) Remove or reinstall any component or assembly, (b) Disconnect an electrical plug or connector, (c) Connect a test component in parallel with an electrolytic capacitor.

3.Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to their original position.

4.After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that the portion around the serviced part has not been damaged.

5.Check the insulation between the blades of the AC plug 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 megohm.

7.Never defeat any of the B+ voltage interlocks. Do not apply AC power to the unit (or any of its assemblies) unless all solid-state heat sinks are correctly installed.

8.Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument’s ground lead last.

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Precautions

1-3 Precautions for Electrostatically Sensitive Devices (ESDs)

1.Some semiconductor (“solid state”) devices are easily damaged by static electricity. Such components are called Electrostatically Sensitive Devices (ESDs); examples include integrated circuits and some field-effect transistors. The following techniques will reduce the occurrence of component damage caused by static electricity.

2.Immediately before handling any semicon ductor components or assemblies, drain the electrostatic charge from your body by touching a known earth ground. Alternatively, wear a discharging wrist-strap device. (Be sure to remove it prior to applying power— this is an electric shock precaution.)

3.After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent accumulation of electrostatic charge.

4.Do not use freon-propelled chemicals. These can generate electrical 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 “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 materials.

8.Immediately before removing the protective material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.

9.Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together, or lifting a foot from a carpeted floor can generate enough static electricity to damage an ESD.

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Specifications and IC Data

2. Specifications and IC Data

2-1 Specifications

T e le v is io n S y s te m :	MO D E L		S YS T E M
	CI	P AL -I	(U H F )
	CII	P AL -I	(V H F /U H F )
	CX	P AL -B /G ,S E C AM-B/G
	CK	P AL -B /G ,D /K,S E C AM-B /G ,D /K
	CB	P AL -B /G
	CF	SECAM-L/L' , PAL/SECAM-B/G

C han n e ls :	SYSTEM	PAL/SE CAM	PAL/SE CAM	SECAM-K1,
	BAND	-B/G,I	-D/K	PAL-D
	VHF	2-12	1-13	2-9
	UHF	21-69	21-69	13-57

In ter m e diate-F r equ en c ies (MH z ):
	SYSTEM	PAL/SECAM	PAL/SECAM	P AL-I	SECAM-L	SECAM-L'
BAND		-B/G	-D/K,K1
P icture IF	Carrier	38.90	38.90	38.90	38.90	34.50
Sound IF	Carrier	33.40	32.40	32.90	34.40	41.00
Color Sub Carrier		34.47	34.47	34.47	34.47	38.93

P ic tu r e	T ub e:
			21 Inch		A51EER131X31
			25	Inch	A59EAK071X01 (Normal)
					A59EAK552X21 (Invar)
						Quick start, in-line-gun,
			28	Inch	A66EAK071X01 (Normal)
						Black stripe, 90	°	degree deflection
					A66EAK552X21 (Invar)
			30	Inch	A70QBZ791X
P o wer R e qu ir e m en ts: AC 230 V, 50Hz or AC 220 ~ 240 V, 50Hz
An tenn a	In p u t Im ped an c e :
			V H F ,U H F : T ele s c op ic dip o le ante nn a (75 Ω u nb alanc ed ty pe )
Sp ea k er	Im p ed anc e : 8 Ω				, 1 0W + 10 W or 16 Ω , 5W + 5W (533C only)

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Specifications and IC Data

2-2 IC Line Up

LOC NO	NO	Specification	Description	R emarks
HIC 101	1	P AP 103T	IF P R E-AMP
IC 201	2	TDA8844	PAL/SEC AM/NTSC /SE CAM-L
		TDA8843	P AL/NTSC
IC 301	3	LA7845	VE R TIC AL DEFLE CTION AMP
IC 501	4	TDA6108	R GB DR IVE AMP
IC 601	5	TDA7297	SOUND AMP(10W/C H)
		TDA7266S	SOUND AMP (5W/C H)
IC 701	6	TDA9859	AUDIO PR OC ESSOR
IC 801	7	KA3S1265R	SMP S IC (12A)
IC 802	8	PC 123Y	P HOTO C OUP LE R
IC 803	9	78R 05	SWITC HING R EGULATOR
IC 804	10	KA7630	SWITC HING R EGULATOR (5,8V)
IC 901	11	SPM171EE	MICOM
IC 902	12	24W16	EE P ROM	16K
IC E01	13	4558	EW DRIVE AMP
IC N01	14	TDA9814T	SIF DETEC TOR (SECAM-L)	NIC AM
IC N02	15	TDA9874H	NICAM DE MODULATOR	MODULE
IC A01	16	LA7567N	SIF DETEC TOR	A2 STE R EO
IC A02	17	TDA9873H	A2 DEMODULATOR	MODULE
ICM01	18	LA7566	SIF & FM DE TE C TOR	MONO
IC S01	19	TEA5114	VIDE O SWITCH	RGB -S/W

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Specifications and IC Data

2-3 Semiconductor Base Diagrams

ELECTROLYTIC-

CONDENSER

DIODE

IC

TDA884X(Pin 56) SPM171EX(Pin 52) 24W16(Pin 8) TDA9859(Pin 32)

TRANSISTOR	TRANSISTOR		IC	SAW-FILTER
	2SD1651		UPC574J	G1962
	2SD1650			K2950M
	KSD5072	KSA815-Y	or	K9253M
	KSD5071		KA33V	G3956M
		KSA539-Y
	KSD1711			1

B

C

E

E B C

IC	TRANSISTOR	TRANSISTOR
	KA7630
	KA7812	KSR1012
		KSR1010
		KSR2010

IN

G E C B

OUT

Fig. 2-1 Semiconductor Base Diagrams

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MEMO

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Disassembly and reassembly

3. Disassembly and Reassembly

3-1 Back Cover Removal

1. After removing the 7 screws, pull the cabinet backwards.

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Disassembly and reassembly

3-2 Main Board Removal

3

1

2

11

4

13

8

5

7

12

6

9

10

1.Separate the TBC-wire 2P connector from GT501,GT502.

2.Separate the CRT Assembly from the CRT socket.

3.Remove the Anode Cap from the CRT.

4.Separate the D-Coil Connector from CN802.

5.Separate 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.Separate the AC cord from the wire clamper.

14.Remove the main board by pulling it with both hands.

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Disassembly and reassembly

3-3 Speaker Removal

1. Remove the speaker by pressing the tension rib.

7

1.Separate the speaker wires from D-coil (located on the bottom to the right side).

2.Remove the screws.

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Disassembly and reassembly

3-4 CRT Removal

1.Remove the 4 nuts that mount the CRT to the front cabinet. Pull the 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.

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Alignment and Adjustments

4. Alignment and Adjustments

4-1 Preadjustment

4-1-1 Factory Mode

1.Do not attempt these adjustments in the Video Mode.

2.The Factory Mode adjustments are necessary when either the EEPROM (IC902) or the CRT is replaced.

3.Do not tamper with the “Adjustment” screen of the Factory Mode menu. This screen is intended only for factory use.

4-1-3 When CRT Is Replaced

1.Make the following adjustments AFTER setting up after setting up purity and convergence :

White Balance Sub-Brightness, Sub-Contrast Vertical Center

Vertical Size Horizontal Size

Fail Safe (This adjustment must be the last step).

4-1-2 When EEPROM (IC902) Is Replaced

1.When IC902 is replaced all adjustment data revert to initial values. It is necessary to re-program this data.

2.After IC902 is replaced, warm up the TV for 10 seconds.

4-2 Factory/Service Mode

4. Selection sequences for the PAL system:

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 “SERVICE (FACTORY)” message will be displayed. The Service Mode has three components: Adjustment, Option and Reset.

3.Access the Adjustment Mode by pressing the “VOLUME” keys ( Up or Down). The adjustment parameters are listed in the accompanying table, and selected by pressing the CHANNEL keys (▲ ,▼).

DOWN or UP key:

AGC↔VCO↔SBT↔SCT↔SCR↔SC↔RG↔ BG↔CDL↔STT↔LCO↔VOL↔PSL↔PVS↔ PVA↔PHS↔PEW↔PEP↔PEC↔PET↔VSC↔ TSC↔SA↔QEW↔PCT↔PTT↔PHM↔PVP↔ PHP↔NSR↔PDL↔AGC.

5.The VOLUME keys increase or decrease the adjustment values (stored in the

non-volatile memory) when Adjustment Mode is cancelled.

6.Cancel the Adjustment Mode by re-pressing the “HIDDEN” or “Power OFF/ON” keys.

7.After adjustments are completed, re-start

the TV set.

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