samsung MR20300FX-TCE, CT1488BLFX-XAP, CT1991FX-SMS, CT2088BWFX-GSU, CT2088BWFX-STR Service Manual

COLOR TELEVISION RECEIVER

Chassis :	K15D
Model :	MR20300FX/TCE	CT1488BLFX/XAP
	CT1991FX/SMS	CT2088BWFX/GSU
	CT2088BWFX/STR	CT2188BWFX/XAX
	CT21D8BWFX/XAX	CT21D8BWFX/STR

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.	Electrical Parts List
8.	Block Diagram
9.	Wiring Diagram
10.	Schematic Diagrams

ELECTRONICS

©Samsung Electronics Co., Ltd. JAN. 2003 Printed in Korea

AA82-00286A

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.

1-1

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.

1-2	Samsung Electronics

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.

1-3

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.

CAUTION

These servicing instructions are for use by qualified service personnel only.

To reduce the risk of electric shock do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.

1-4	Samsung Electronics

Specifications and IC Data

2. Specifications and IC Data

2-1 Specifications

Television System:		MODEL				SYSTEM
			CT			NTSC ONLY
		System					NTSC
			Band
Channels:			VHF			2 - 13
			UHF			14 - 69
			CABLE			1 - 125
Intermediate Frequencies (MHz) :
		SYSTEM
							NTSC
		IF Carrier Frequency
		Picture IF Carrier				45.75
		Sound IF Carrier				41.25
		Color Sub Carrier				42.18
Picture Tube:
		14 Inch	A34KQV42X				14Inch
		15 Inch	A36QDT351X				15Inch Flat
		20 Inch	A48KRD82X				20Inch
		21 Inch	A51KQJ63X				21Inch

Power Requirements:	AC 120V, 60Hz
Antenna Input Impedance:	VHF, UHF : Telescopic dipole antenna (75 ohm unbalanced type )
Speaker Impedance	8 ohm

Samsung Electronics

2-1

Specifications and IC Data

2-2 IC Line Up

Table 2-1 IC Line-Up

	Loc. No	Specificatio		Description	Remark
	IC201S	SPM458AN	TDA9377, English/Spanish/French		Philips
	IC301	LA7840	VERTICAL OUTPUT		Sanyo
	IC501	TDA6107Q	RGB DRIVE AMP		Philips
	IC602	TDA7266M/TDA7266S	SOUND-AMP,	TDA7266M (MONO)	Philips
				TDA7266S (STEREO)
	IC801S	KA5Q0740RT	POWER IC (STR)		FIAIR CHILD
		(0765RT)
	IC802	KA7632	CUSTOM REGULATOR (5V, 8V, 3.3V)		SEC
	IC202	24C04	EEPROM
	PC801S	TCET1108 / LTV817B	PHOTO COUPLER
	ICS601	UPC1851B	Sound Processor (STEREO)		NEC

2-2	Samsung Electronics

Specifications and IC Data

2-3 Semiconductor Base Diagrams

ELECTROLYTIC-

CONDENSER

TRANSISTOR

KSC5802

B

C

E

IC

DIODE

TRANSISTOR

KSC815-Y

KSA539-Y

E B C

LA7840

TDA6107Q

KA7632

IC

SPM458AN(Pin 64)

U4468B(Pin 16)

UPC851B(Pin 42)

SAW-FILTER

M1864M

1	1
1

TRANSISTOR

KSC2331-Y

E C B

Fig. 2-1 Semiconductor Base Diagrams

Samsung Electronics

2-3

MEMO

2-4

Disassembly and reassembly

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).

Samsung Electronics

3-1

Disassembly and reassembly

3-2 Main Board 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.

3-3 Speaker Removal

1. Remove the speaker by pressing the tension rib.

3-2	Samsung Electronics

Disassembly and reassembly

3-4 CRT Removal

1.Spread a soft mat on the floor. Place the TV set face down.

2.Remove the 4 nuts mounting the CRT to the front cabinet. 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.

Samsung Electronics

3-3

MEMO

3-4	Samsung Electronics

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 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.

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.

4. Selection sequences for the all system:

DOWN or UP key:

SCT>SBT>BLR>BLB>RG>GG>BG>VSL>VS>

VA>HS>SC>CDL>STT>AKB>FS>NDL>

LBS>NSR>SCBT>VOL>CAP>HBS>RP00>

RP01>FMWS>AGC1>OMD>SCL>PWL>

MUS>AGC>DSK>DVDB

2.The “SERVICE (FACTORY)” message will be displayed. The Service Mode has four components: ADJUST, OPTION , G2-ADJUST 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 (,).

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 “FACTORY” or “Power OFF” keys.

Samsung Electronics

4-1

Alignment and Adjustments

4-2-2 Main Adjustment Parameter

NO	OSD				FUNCTION			RANGE			INITAL DATA	SETTING		REMARK
												19V	13V
1	SCT	Su b	Co n t ra s t					0	~	23	15	13	13	W/B (HIGH Y)
2	SBT	Su b	Br i g h t n e s s					0	~	23	8	9	9	W/B A (LOW Y)
3	BLR	Bl a c k		Le v e l		o f f se t	Red	0	~	6 3	35	31	31	W/B (LOW X, Y)
4	BLB	Bl a c k		Le v e l		o f f se t	Blu e	0	~	6 3	32	27	27	W/B (LOW X, Y)
5	RG	R e d	G a i n					0	~	6 3	40	32	32	W/B (HIGH X, Y)
6	GG	G r e e n G a i n						0	~	6 3	30	25	25	FIX
7	BG	Bl u e		G a i n				0	~	6 3	42	31	31	W/B (HIGH X, Y)
8	VSL	Ve r t i ca l			S lo p e			0	~	6 3	30	31	31	Vertical SLOPE
9	VS	Ve r t i ca l			Sh i f t			0	~	6 3	31	31	31	FIX
10	VA	Ve r t i ca l			A m p l i t u d e			0	~	6 3	20	40	20	Vertical SIZE
11	HS	H o r i z o n t a l				Sh i f t		0	~	6 3	32	30	30	Horizontal SHIFT
12	SC	S- Co r r e c t i o n						0	~	6 3	35	20	12	FIX
13	CD L	Ca t h o d e			D r i ve Le ve l			0	~	1 5	11	11	7	FIX
14	ST T	Su b	T i n t					0	~	7	3	7	7	FIX
15	AKB	A K B		O n / o f f				0	~	1	0	0	0	FIX
16	FS	Filter Seting						0	~	1 5	32	37	37	FIX(STEREO)
17	ND L	NT SC		De l a y				0	~	1 5	1	1	1	FIX
18	LBS	Low Band Separation Set						0	~	6 3	32	32	32	FIX(STEREO)
19	NSR	N T SC		Su b c o l o r				0	~	2 3	3	3	3	FIX
20	SCBT	S c r e e n B r i g h r t n e s s						0	~	6 3	35	45	45	FIX
21	VO L	Vo l u m e			p re	s e t t i n g		0	~	6 3	10	10	10	FIX
22	CAP	C a p t i o n			P o s i t i o n			0	~	1 5	12	12	12	FIX
23	HBS	H i g h B a n d S e p a r a t i o n S e t						0	~	6 3	32	32	32	FIX(STEREO)
24	RP00	R a t i o P r e / o v e r s h o o t						0	~	1	1	1	1	FIX
25	RP01	R a t i o P r e / o v e r s h o o t						0	~	1	1	1	1	FIX
26	FMWS	W i n d o w S e l e c t i o n S o u n d P L L						0	~	1	0	0	0	FIX (Mono)
27	AGC1	I F A G C S p e e d						0	~	3	1	1	1	FIX (Nomal)
28	OMD	O f f s e t I F D e m o d u l a t o r						0	~	6 3	32	32	32	FIX (No Crrection)
29	SCL	S o f t C l i p p i n g L e v e l						0	~	3	3	1	1	FIX (Off)
30	PWL	P e a k W h i t e L i m i t t i n g						0	~	1 5	15	13	13	FIX (100%)
31	MUS	M a t r i x U S A						0	~	1	0	0	0	FIX (Mono)
32	AGC	A u t o m a t i c G a i n C o n t r o l						0	~	6 3	33	33	33	FIX
33	DSK	D y n a m i c S k i n T o n e						0	~	1	0	0	0	FIX
34	DVDB	D V D B r i g h t O f f s e t						0	~	10	5	4	4	FIX

4-2	Samsung Electronics

Alignment and Adjustments

4-2-3 Option Bytes

In the Service Mode, various can be selected via the Option Table. Example:

Option Table : xx xx

			OSD	SETTING	REMARK
			VIDEO MUTE	ON	- 800msec Mute Time(Tri-norma)
	1
			(When swiching channel)	OFF	- Unavailable
				STEREO	- Zenith stereo (WITH IN UPC1851B)
	2		AUDIO	LINE STEREO	- Line stereo (WITH IN UPC1851B)
				MONO	- Mono (WITH OUT UPC1851B)
	3			ON	- Stereo/L STEREO Model
			TURBO
				OFF	- Mono Model
	4			ZOOM	- Nornal / Zoom
			ZOOM
				NOMAL	- Nomal
				ON	- The power is switched on automatically
					when detaching the Master S/W Auto On
	5		AUTO POWER ON
				OFF	- Tact S/W Model
			SOUND MUTE	OFF	- Unavailable
	6		(NO SIGNAL)	ON	- Available
				ENGLISH
	7		LANGUAGE	ESPANOL	- Start Language Select
				FRENCH/PORTU
	8			OFF	- Unavailable
			HOTEL MODE	ON	- Available
				AIR/STD/HRC/IRC
	9		CATV	AIR/STD/HRC/AFN	- U.S Army
				ON	- Available (U.S.A, Army)
	10		X-RAY	OFF	- Unavailable (South America)
				ON	- Available (U.S.A)
	11		V-CHIP	OFF	- Unavailable (Canada)
				TV ↔ AV
	12		AV Option	TV ↔ AV ↔ DVD
				ON	- Available (South America)
	13		DEMO	OFF	- Unavailable (U.S.A)

Samsung Electronics

4-3

Alignment and Adjustments

4-3 Other Adjustments

4-3-1 General

4-3-2 Automatic Degaussing

1.Usually, a color TV needs only slight touchup adjustment upon installation. Check the basic characteristics such as height, horizontal and vertical sync and focus.

2.The picture should have 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.

3.Use the specified test equipment or its equivalent.

4.Correct impedance matching is essential.

5.Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal markers, do not allow the marker generator to distort test results.

6.Connect the TV only to an AC power source with voltage and frequency 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 isolation transformer.

A degaussing coil is mounted around the picture 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 second after the power is switched ON. If the set has been moved or turned in a different direction, disconnect its AC power for at least 30 minutes.

If the chassis or parts of the cabinet become magnetized, poor color purity will result. If this happens, use an external degaussing coil. Slowly move the degaussing coil around the faceplate of the picture tube and the sides and front of the receiver. Slowly withdraw the coil to a distance of about 6 feet before removing power.

4-4	Samsung Electronics

4-3-3 High Voltage Check

CAUTION: There is no high voltage adjustment on this chassis. The B+ power supply must be set to +122.5 volts (Full color bar input and normal picture level).

1.Connect a digital voltmeter to the second anode of the picture tube.

2.Turn on the TV. Set the Brightness and Contrast controls to minimum (zero beam current).

3.The high voltage should not exceed 30KV.

4.Adjust the Brightness and contrast controls to

both extremes. Ensure that the high voltage does not exceed 30KV under any conditions.

4-3-4 FOCUS Adjustment

1.Input a black and white signal.

2.Adjust the tuning control for the clearest picture.

3.Adjust the FOCUS control for well defined scanning lines in the center area of the screen.

4-3-5 Cathode Voltage Adjustment

(Screen Adjustment)

1.Connect CRT socket pin GK to an oscilloscope probe.

2.Input a gray scale pattern. (Use a pattern generator, 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).

125 + 2.5V

GND

Fig. 4-1

Alignment and Adjustments

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 convergence yoke into the CRT and set in as shown in Fig. 4-2.

4.Input a black and white signal.

5.Fully demagnetize the receiver by applying an external degaussing coil.

6.Turn the CONTRAST and BRIGHTNESS controls to maximum.

7.Loosen the clamp screw holding the yoke. Slide the yoke backward or forward to provide vertical green belt. (Fig. 4-3).

8.Tighten the convergence yoke.

9.Slowly move the deflection yoke forward, and adjust for the best overall green screen.

10.Temporarily tighten the deflection yoke.

11.Produce blue and red rasters by adjusting the low-light controls. Check for good purity in each field.

12.Tighten the deflection yoke.

Samsung Electronics

4-5

Alignment and Adjustments

	4 Pole Magnet
	2 POLE
	PURITY
6 Pole Magnet	2 Pole Magnet
Clamper
Screw	ADJU
	(VERT

YOKE

CLAMP

SCREW

6 POLE CONVERGENCE

4 POLE CONVERGENCE

Fig. 4-2 Convergence Magnet Assembly

Vertical Green Belt

31m/m

1

2

Fig. 4-3 Center Convergence Adjustment

4-3-7 White Balance Adjustment

(a) Set up

1.Warm up the TV for at least 30 minutes in the Aging Mode (OSD White). This mode is displayed 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.
Fig. 4-4	2.	Adjust RG,BG so that the levels are suitable to
		each local area.
	(c)	High-Light Adjustment
	1.	Set SCT to 50FL(13V : 60FL) in the Factory
		Service Mode with using CA100.
		See Fig. 4-4 .

4-6	Samsung Electronics

4-3-8 Center Convergence Adjustment

1.Warm up the receiver for at least 20 minutes.

2.Adjust the two tabs of the 4 pole magnets to change the angle between them. Superimpose the red and blue vertical lines in the center area of the screen.

3.Adjust the Brightness and Contrast controls for a well defined picture.

4.Adjust the two-tab pairs of the 4 pole magnets, and change the angle between them. Superimpose the red and the blue vertical lines in the center area of the screen.

Alignment and Adjustments

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 lines.)

7.Repeat adjustments 2~6, if necessary.

8.Since the 4-pole magnets and 6-pole magnets interact, the dot movement is complex

(Fig. 4-5).

BLUE		RED			RED/BLUE			GREEN
BLUE					RED/BLUE
RED					GREEN
4-Pole Magnet Movement					6-Pole Magnet Movement

Fig. 4-5 Center Convergence Adjustment

Samsung Electronics

4-7

Alignment and Adjustments

4-3-9 RF AGC Adjustment

Set the AGC data to 33 (Factory Mode).

4-3-10 Sub-Color Adjustment

Set NSR data to 3 (Factory Mode).

4-3-11 Geometry Adjustment

SC →VS→VA→VSL→HS

1.Input a lion head pattern.

2.Set the SC (S-Correction) as 20(13V : 12) and VS(Vertical Shift) 31 so that the lion head circle becomes oval.

3.Adjust with VA (Vertical Amplitude) so that the top margin of the picture is 4.

4

Fig. 4-7

4.Adjust with VSL (Vertical-Slope) so that the bottom margin of the picture is 4.

4

Fig. 4-8

5.Adjust with HS (Horizontal Shift) so that the lion-head pattern and CRT centers are aligned.

5

5

Fig. 4-9

6.Adjust HS (Horizontal Shift) so that the left and right margins of the picture are 5.

4-8	Samsung Electronics

Troubleshooting

5. Troubleshooting

5-1 No Power

Counect the Power code

Check the

Normal

Check the

Normal

Check the

Abnormal

3.3V-A,5V-A Line

X-tal,SDA,SCL

port

12.5V-A Line

of IC201S

of IC201S

Abnormal

Normal

Abnormal

Replace

IC201 S

Check the

FD801S, D807, IC801S

Check the

or AC-Fuse

Check/Replace

IC802

(33)Pin (H-Drive)

of IC201S

Abnormal

Normal

Abnormal

Check the

122.5V- A Line

Normal

Check the

FBT,D805(D806)

Check / Replace

Q401

Samsung Electronics

5-1

Troubleshooting

5-2 No Video (Sound OK)

Check RK,GK,BK	Abnormal	Check R,G,B	Nornal	Check IC501
		Signal into CRT		B+(180V-B)
Signal
		PCB
Nornal
				Abnormal
Check the	Abnormal
Voltage of heater
		Abnormal
				Check the
	Check/Replace			resistance of R420
Nornal
	R421,R422,D505

Nornal

Check

CRT and FBT

Abnormal	Check IC201S	Check/Replace
	Pin 51,52,53	D812,FBT
	(R.G.B)
Check/Replace	Nornal
IC201S
	Check IC201S
	Pin 49(BCL-IN)
Abnormal	Pin50(IK)
	Nornal
	Check
	CRT and FBT

Nornal

Re-Adjust

Screen Voltage

Abnormal

Replace

R420

5-2	Samsung Electronics