SAMSUNG CT3338FX-XAP, CT5038FX-XAP, CT2088BLFX-XAP, CT20D8BWFX-XAP Service Manual

COLOR TELEVISION RECEIVER

Chassis : K15D

Model : CT3338FX/XAP

CT5038FX/XAP

CT2088BLFX/XAP

CT20D8BWFX/XAP

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. SEP. 2002 Printed in Korea

AA82-00154A

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

Exploded View & Parts List

6. Exploded View & Parts List

6-1 CT3338FX/XAP

	2-2
2-1	2

1-8

1-7

		No	Code No	Description;Specification	Q’ty	Remark
		1	AA64-31147Q	CABINET FRONT;3338,SV704P EPPV,HIPS,HB,G	1	F/C
3-1	3	1-1		INLAY-A/V
	3-2	1-2	AA64-70127F	BADGE-BRAND;AL,SS,SILVER,R800	1	BADGE
		1-3	AA64-40057A	WINDOW-REMOCON;-,ABS,HB,-,-,33	1	WR
		1-4	AA64-10153J	KNOB POWER;3338,ABS,-,G3676,NO-SILK,HB,-	1	KP
		1-5	AA61-60003J	SPRING-CS;-,-,SUS304,0.5,OD6,H	1	SPRING
		1-6	6003-001026	SCREW-TAPTITE;RH,+,B,M4,L15,ZPC(BLK),SWR	1	KC+CF
		1-7	AA64-10052B	KNOB-CONTROL;-,3338,G3676 JPN,ABS,HB,GRA	1	KC
		1-8	AA96-00144A	ASSY-SPEAKER;-,8OHM,2.5WX2,3001-000281,A	1	A/SPK
		1-9	AA61-40010A	BOSS-CABINET;-,HIPS,HB,BLK,	2	BOSS
		2	AA03-10002M	CRT-COLOR;-,A34KQV42X,0MG,14,	1	CRT
		2-1	AA61-00735A	HOLDER;20POLYVINIL,DEGAUSSING,CHLORI	2	CDCOIL
	4	2-2	AA60-10050Q	SCREW-ASSY;WC,HH,M5,L26.5,SWRCH,	4	CRT+CF
		3	AA64-00170A	CABINET-BACK;,HIPS,HB,G4309	1	B/C
		3-1	AA42-00004A	ANT ROD;VHF,4SDODIPOLE850MMBRN	1	A/ROD
		3-2	6003-001026	SCREW-TAPTITE;RH,+,B,M4,L15,ZPC(BLK),SWR	4	CB+CF

1-6

4

AA96-00669A

ASSY POWER CORD;,CP2 N/P,H/C250,AA61-200

1

PWR/AC

1-5

1-1

1-2 1-3 1-4

Samsung Electronics

6-1