Samsung spl4225k service manual

PLASMA DISPLAY TV

Chassis : D53A Model: SPL4225X/XAA

PLASMA DIAPLAY TV CONTENTS

Precautions

Reference Information

Specifications

Alignment and Adjustments

Circuit Operation Description

Troubleshooting

Exploded View and Parts List

Electric Parts List

Handling Description

Glossary

Wiring Diagram

Schematic Diagrams

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

ELECTRONICS

Printed in Korea

AA82-

1. Precautions

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 fornt cabinet and back cabinet, excessively wide cabinet

ventilation slots, and improperly fitted back

covers.

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 (ANSI C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1950.5.2).

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 3.5 milliamp. Reverse the powerplug 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 lead to the coaxial connector.

7. High Voltage Limits: High voltage must be measured each time servicing is done on the B+, horizontal deflection

or high voltage circuits.

Precautions

Samsung Electronics 1-1

LEAKAGE CURRENT

TESTER

DEVICE UNDER

TEST

TEST ALL

EXPOSED METAL

SURFACES

2-WIRE CORD

ALSO TEST WITH

PLUG REVERSED

(USING AC ADAPTER

PLUG AS REQUIRED)

EARTH

GROUND

(READING SHOULD

NOT BE ABOVE

0.5mA)

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

1-2 Safety Precautions (Continued)

8. 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.

9. 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.

10. 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.

11. 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.

12. 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.

13. 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.

14. 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.

15. 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.

Precautions

1-2 Samsung Electronics

1-3 Servicing Precautions

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. 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.

7. 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.

8. Plasma display panels have partial afterimages when a same picture continues to be displayed for a certain time. This happens due to the degradation of brightness caused by a scale-down effect. To prevent such afterimages when displaying a same picture for a certain time, be sure to reduce the level of brightness and contrast. ex) Contrast : 50 or 75, Brightness : 25

9. Plasma display is an array of pixels(cells). Therefore, if at least 99.9% pixels keep normal, the appropriate panel is judged as ‘approved product.’ Even though some of pixels keep luminescent or always light off, do not worry because the panel is approved.

Precautions

Samsung Electronics 1-3

Warning 1 : 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.

Warning 2 : An electrolytic capacitor installed with the wrong polarity might explode.

1-4 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.

Precautions

1-4 Samsung Electronics

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.

Reference Information

Samsung Electronics 2-1

2. Reference Information

2-1 Tables of Abbreviations and Acronyms

A Ah Å dB dBm

°C °F °K F G GHz g H Hz h ips kWh kg kHz kΩ km km/h kV kVA kW I MHz

Ampere Ampere-hour Angstrom Decibel Decibel Referenced to One Milliwatt Degree Celsius Degree Fahrenheit degree Kelvin Farad Gauss Gigahertz Gram Henry Hertz Hour Inches Per Second Kilowatt-hour Kilogram Kilohertz Kilohm Kilometer Kilometer Per Hour Kilovolt Kilovolt-ampere Kilowatt Liter Megahertz

MV MW MΩ m µA µF µH µm µs µW mA mg mH mI mm ms mV nF

Ω

pF Ib rpm rps s V VA W Wh

Megavolt Megawatt Megohm Meter Microampere Microfarad Microhenry Micrometer Microsecond Microwatt Milliampere Milligram Millihenry Milliliter Millimeter Millisecond Millivolt Nanofarad Ohm Picofarad Pound Revolutions Per Minute Revolutions Per Second Second (Time) Volt Volt-ampere Watt Watt-hour

Table 2-1 Abbreviations

Reference Information

2-2 Samsung Electronics

Table 2-2 Table of Acronyms

ABL AC ACC AF AFC AFT AGC AM ANSI APC APC A/V AVC BAL BPF B-Y CATV CB CCD CCTV Ch CRT CW DC DVM EIA ESD ESD FBP FBT FF FM FS GND G-Y H HF HI-FI IC IC IF

Automatic Brightness Limiter Alternating Current Automatic Chroma Control Audio Frequency Automatic Frequency Control Automatic Fine Tuning Automatic Gain Control Amplitude Modulation American National Standards Institute Automatic Phase Control Automatic Picture Control Audio-Video Automatic Volume Control Balance Bandpass Filter Blue-Y Community Antenna Television (Cable TV) Citizens Band Charge Coupled Device Closed Circuit Television Channel Cathode Ray Tube Continuous Wave Direct Current Digital Volt Meter Electronics Industries Association Electrostatic Discharge Electrostatically Sensitive Device Feedback Pulse Flyback Transformer Flip-Flop Frequency Modulation Fail Safe Ground Green-Y High High-Frequency High Fidelity Inductance-Capacitance Integrated Circuit Intermediate Frequency

I/O L L LED LF MOSFET MTS NAB NEC NTSC OSD PCB PLL PWM QIF R RC RF R-Y SAP SAW SIF SMPS S/N SW TP TTL TV UHF UL UV VCD VCO VCXO VHF VIF VR VTR VTVM TR

Input/output Left Low Light Emitting Diode Low Frequency Metal-Oxide-Semiconductor-Field-Effect-Tr Multi-channel Television Sound National Association of Broadcasters National Electric Code National Television Systems Committee On Screen Display Printed Circuit Board Phase-Locked Loop Pulse Width Modulation Quadrature Intermediate Frequency Right Resistor & Capacitor Radio Frequency Red-Y Second Audio Program Surface Acoustic Wave(Filter) Sound Intermediate Frequency Switching Mode Power Supply Signal/Noise Switch Test Point Transistor Transistor Logic Television Ultra High Frequency Underwriters Laboratories Ultraviolet Variable-Capacitance Diode Voltage Controlled Oscillator Voltage Controlled Crystal Oscillator Very High Frequency Video Intermediate Frequency Variable Resistor Video Tape Recorder Vacuum Tube Voltmeter Transistor

Specifications

Samsung Electronics 3-1

3. Specifications

MODEL

3-1 Display(PDP Monitor)

Display

Remote Control

Display

Remote Control

Voltage

Power Consumption

Number of Pixels

Screen Size

AUDIO Input

AUDIO Output

VIDEO Input

Dimensions

(mm/inch)

Weight

SPL4225

1038.8(W) x 89(D) x 635(H)mm / 40.9(W) x 3.5(D) x 25(H) Inches

54(W) x 31.5(D) x 220(H)mm / 2.13(W) x 1.24(D) x 8.66(H) Inches

32Kg / 70.55\bs

150g (Including batteries) / 0.33\bs

AC 100-240V, 50/60Hz

310 Watts

852(H) X 480(V)

106Cm / 42 Inches

VIDEO / S-VIDEO

COMPONENT 1

COMPONENT 2

PC (RGB)

7W + 7W (8Ω)

VIDEO

S-VIDEO

COMPONETN 1 -480i / 480p

COMPONETN 2 -480p~1080i

PC (RGB)

3-2 Samsung Electronics

MENO

Alignment and Adjustments

Samsung Electronics 4-1

4. Alignment and Adjustments

4-1 Service Mode

4-1-1 SERVICE MODE ENTRY METHOD (General Transmitter)

1. Turn off the power to make the SET STAND-BY mode.

2. In order to enter the Service Mode, select MUTE-1-8-2-POWER.

S In case entry into SERVICE MODE is unsuccessful, repeat the procedures above.

4-1-2 Initial DISPLAY State in times of SERVICE MODE Switch overs

4-1-2(A) OSD DISPLAY

4-1-2(B) BUTTONS OPERATIONS WITHIN SERVICE MODE

#Notice

1. In case of no signal in ALL MODE. entry into the FACTORY MODE cannot be made.

1. PWS364 - Video

2. SDA9280 - Video

3. VPC3230 - Video

4. SDA9400 - Video

5. CXA2101 - Video /HSComponent

6. AD9884

7. OSD Position

8. Option

9. Reset

10. Aging

Release Time :

Menu Joystick UP/DOWN Joystick (LEFT/RIGHT)

Entire menu display Cursor move to select items Enable to increase and decrease the data of the selected items

MENU

Alignment and Adjustments

4-2 Samsung Electronics

4-1-3 Details of Control

4-1-3(A) PW364

No OSD Range

1

2

3

4

Horizontal Size

Vertical Size

Horizontal Pos

Vertical Pos

0 ~ 255

DO NOT ENTER

4-1-3(B) SDA9280

Default of MODE

VIDEO / S-VHS /DVD 1080i 720p 480p PC

2

51

185

24

148 (Fix)

45

148 (Fix)

11

69

46

188

13

80

42

121

29

No OSD Range

1

2

3

4

5

6

7

8

CTI THRESH

CTI TRAWID

Y-DELAY

LPF GAIN

BPF GAIN

HPF GAIN

PHACOM

COR

0 ~ 15

0 ~ 12

0 ~ 15

0 ~ 7

0 ~ 15

0 ~ 2

0 , 1

Default of MODE

VIDEO / S-VHS /DVD DTV PC

DO NOT ENTER

8

1

8

7

10

8

2

1

-

Alignment and Adjustments

Samsung Electronics 4-3

4-1-3(C) VPC3230

4-1-3(D) SDP9400

No OSD Range

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Bright YUV

Cont YUV

IF Comp

Chroma band

Luma LPF

HPLL Speed

Luma Delay

3230 Bright

3230 Contrast

H LPF Y/C

H LPF Chroma

H Peak Filter

Peaking Gain

Coaring Off/On

0 ~ 255

0 ~ 63

0 ~ 3

0 , 1

0 ~ 3

0 ~ 8

0 ~ 255

0 ~ 63

0 ~ 3

0 , 1

0 ~ 2

0 ~ 7

0 , 1

Default of MODE

VIDEO / S-VHS /DVD DTV PC

DO NOT ENTER

195

29

0

3

1

8

146

42

0

2

4

1

-

No OSD Range

1

2

3

4

OUT DELAY

TNRCLY

TNRCNC

STOP MODE

0 ~ 255

0 ~ 15

0 ~ 7

Default of MODE

VIDEO / S-VHS /DVD DTV PC

DO NOT ENTER

10

0

10

3

-

Alignment and Adjustments

4-4 Samsung Electronics

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

Limit Level

System

D-Color

R Drive

G Drive

B Drive

R CutOff

G CutOff

B CutOff

ABL Mode

ABL TH

H Sep Sel.

Contrast

Bright

Cr Offset1

CB Offset1

Drive

4-1-3(E) CXA2101

No OSD Range Remarks

Default of MODE

VIDEO DTV

0 ~ 3

0 ~ 63

0 ~ 3

0 , 1

0 ~ 63

0 ~ 3

0 ~ 15

-

0

2

31

0

9

52

7

-

0

3

31

0

9

52

7

-

DO NOT

ENTER

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

Sub Bright

Sub Cont

Sub Color

Sub Hue

Sub SHP

R-Y/R

R-Y/B

G-Y/R

G-Y/B

PABL Level

SHP F0

Pre/over

CTI Level

LTI Level

DC-Tran

D-Pic

No OSD Range Remarks

Default of MODE

VIDEO DTV

-

0 ~ 15

0 ~ 3

0 ~ 15

0 ~ 3

38

9

5

2

8

12

7

4

6

3

0

1

0

1

2

40

8

10

5

3

4

9

5

7

6

3

2

1

0

1

DO NOT

ENTER

Alignment and Adjustments

Samsung Electronics 4-5

4-1-3(F) AD9884

No OSD Range

1

2

3

4

5

6

7

8

9

10

11

12

Red Gain

Green Gain

Blue Gain

Red Offset

Green Offset

Blue Offset

Gain Drive

Offset Drive

V Contrast

V Bright

Phase

Charge Pump

0 ~ 255

0 ~ 63

0 ~ 31

0 ~ 7

135

130 (Fix)

150

124

128 (Fix)

132

50

150

DO NOT ENTER

0 (Fix)

Default of MODE

VIDEO / S-VHS /DVD 1080i 720p 480p PC

134

130 (Fix)

141

125

128 (Fix)

113

DO NOT ENTER

30

42

15

0

3

142

130 (Fix)

136

125

128 (Fix)

119

36

38

15

4-1-3(G) OSD POSITION

No OSD Item Range Default Description

12Horiz

Vert

Horiz (Left,Right)

Vert (Up,Down)

-128 ~ +128

-24 ~ +24

40

16

Move 8 by 8 (Total: 33 Step), Fixed

Move 8 by 8 (Total: 7 Step), Fixed

134

130 (Fix)

141

125

128 (Fix)

113

2

DO NOT ENTER

30

42

15

0

Alignment and Adjustments

4-6 Samsung Electronics

4-1-3(H) OPTION

1

2

3

4

5

6

7

8

Back Ground Color

Shift Pixel

Pixel Shift Min

Pixel Shift SEC

Fan Protect

Temp Protect

Sharpness

Base Language

No OSD Range

Default of MODE

VIDEO / S-VHS /DVD PC

BLUE1 ↔ GREEN

0 ~ 8

0 Min ~ 59 Min

0 Sec ~ 59 Sec

Off ↔ On

0 ~ 15

English → Espania →

France → Korea → English

BLUE1

4

4 Min

0 Sec

Off

On

5

English

-

5

English

-

7

English

-

8

English

DTV

720p 1080i

Samsung Electronics 4-7

Alignment and Adjustments

4-1-4 White Balance Adjust Method

1. Press MUTE-1-8-2-POWER to enter the factory mode.

2. Enter "6. AD9884"

3. Adjust LOW coordinates as R,B OFFSET and HIGH coordinates as R,B GAIN. (GREEN is fixed)

4. In VIDEO,DTV mode, Adjust LOW light as "V BRIGHT".

5. In PC mode, Adjust LOW light as "OFFSET DRIVE".

6. In VIDEO,DTV mode, Adjust HIGH light as "V CONTRAST".

7. In PC mode, Adjust HIGH light as "GAIN DRIVE".

- W/B Adjustment SPEC(Suwon Factory Toshiba PATTERN)

√ VIDEO MODE

√ DTV MODE

Adjustment

Coordinates

H-LIGHT

L-LIGHT

Coordinates

Value

x : 279 y : 283

Y : 28.4[f\]

x : 297 y : 252

Y : 0.53[f\]

Adjustment

Deviation

±: 3 ±: 3 ±: 3

±: 5 ±: 5 ± : 0.1

Adjustment

Coordinates

H-LIGHT

L-LIGHT

Coordinates

Value

x : 274 y : 275

Y : 30.8[f\]

x : 313 y : 275

Y : 0.59[f\]

Adjustment

Deviation

±: 3 ±: 3 ±: 3

±: 5 ±: 5 ± : 0.1

Alignment and Adjustments

4-8 Samsung Electronics

√ PC MODE

Adjustment

Coordinates

H-LIGHT

L-LIGHT

Coordinates

Value

x : 280 y : 278

Y : 16.4[f\]

x : 298 y : 244

Y : 1.19[f\]

Adjustment

Deviation

±: 3 ±: 3 ±: 2

±: 5 ±: 5 ± : 0.1

Alignment and Adjustments

Samsung Electronics 4-9

Alignment and Adjustments

4-2 SPL4225 PC Input Mode

USER

V-Position

Factory

HP/VP/P

PHASE

CLOCK/

fO(Hz)

125/22/0/0

70.1

125/8/0/1

125/16/0/0

125/8/0/1

125/16/0/0

85

70.0

124/31/0/0

125/31/0/0

124/31/0/0

125/31/0/0

75

72.8

125/2/0/0

125/9/1/2

125/2/0/0

125/9/1/2

59.9

85.1

125/0/0/1

125/31/0/2

125/0/0/1

125/31/0/2

75

72.2

126/1/0/1

125/15/0/1

126/1/0/1

125/15/0/1

60.3

56.3

126/14/2/3

125/20/1/3

125/21/1/3

125/16/1/2

126/14/2/3

125/20/1/3

125/21/1/3

85

75

70.1

125/16/1/2

60

HFreqSec

/99=31.777

HS1Period

31.777u/10.1n=3146.2

Dot_c

V_P

H_P

VTotal

28.232

1

0

449

31.777

25.175

0

1

449

31.777

HFreqSes

=23.111

=26.666

=2288.21

=2640.29

36.0

31.5

0

509

500

23.111

26.667

=26.414

=31.777

=2615.14

=3146.23

31.5

25.175

0

520

525

26.413

31.777

=18.626

=21.333

=1844.65

=2112.17

49.5

56.25

1

631

625

18.631

21.333

=20.797

=26.393

=2059.4

=2613.86

50.0

40.0

1

666

628

20.800

26.400

=28.444

=14.555

=2816.23

=1441.68

36.0

94.5

1

625

808

28.444

14.561

=16.656

=17.707

=1649.50

=1753.16

78.75

75.000

1

0

1

0

800

806

16.660

17.707

=20.676

=2047.22

65.000

0

806

20.677

400

350

480

600

768

1024

14

768

1024

15

VRes

720

640

800

1024

12

1024

13

HRes

1

2

3

4

5

6

7

8

9

10

NO

11

Alignment and Adjustments

4-10 Samsung Electronics

Alignment and Adjustments

4-3 Discharge Voltage Adjustment Method (Monitor) in Times of ASS’Y Repair

and Replacement

-All VR (Variable Resistor), except for VR for Vs, voltage goes down when turned counterclockwise.

l Vsc and Vy Adjustment Method

l Vs and Va Adjustment Method

n Vsc is the voltage of the left terminal

for D5207

n Voltage adjustment is made for Vsc by

using VR5201

n Standard voltage for Vsc is –55V±10V

n Vy is the voltage of the right terminal

for D5207

n Voltage adjustment is made for Vy by

using VR5200

n Standard voltage for Vy is 132V±10V

n Vs is the voltage of the no.11 PIN of SX

Connector.

n Voltage adjustment is made for Vs by

using VR in 7

n Vs is 175±5V

n Va is the voltage of the no.7 PIN of SX

Connector.

n Voltage adjustment is made for Va by

using right VR in 6

n Va is 75±5V

Y-Main

Alignment and Adjustments

Samsung Electronics 4-11

Alignment and Adjustments

l Vw Adjustment Method

n Vw is the voltage of the right terminal

for R4414

n Voltage adjustment is made for Vw by

using VR4400

n Standard voltage for Vw is 175V±5V

Alignment and Adjustments

4-12 Samsung Electronics

Alignment and Adjustments

4-4 Fault Finding Using MULTI METER

Parts defects can be found for DIODE TRANSISTOR IC, using MULTI TEST including Forward/Reverse direction Multi Test. Of course, in case resistance of several ohms and COIL are connected in parallel circuit, the lock out circuit parallel connected to part must be severed.

1.DIODE

2. TRANSISTOR

l For NPN(KSC815-Y, 2SC2068, 2SC2331-Y)

l For PNP(KSA539-Y)

Forward Direction

Hundreds of ohms

Reverse Direction

Infinity

Between Anode and Cathode

C (COLLECTOR)

E

B(BASE)

BC

C (COLLECTOR)

E

B(BASE)

BC

E (EMITTER)

Forward Direction Hundreds of ohms Hundreds of ohms

Infinity

Reverse Direction

Infinity Infinity Infinity

Between B and E Between B and C Between E and C

Forward Direction Hundreds of ohms Hundreds of ohms

Infinity

Reverse Direction

Infinity Infinity Infinity

Between B and E Between B and C Between E and C

+- +-

Alignment and Adjustments

Samsung Electronics 4-13

Alignment and Adjustments

3. IC (INTEGRATED CIRCUIT)

IC has built in DIODE against overvoltage in PIN. Generally, except for internal circuit defects, IC defects can be found, by measuring the DIODE.

› Defects have SHORT(0 ohm) for both forward and reverse direction.

Hundreds of ohms

Forward Direction

Reverse Direction

Varying depending on IC but generally normal

Infinity in DIODE TEST MODE

4-14 Samsung Electronics

MEMO

Troubleshooting

Samsung Electronics 6-1

6. Troubleshooting

6-1 Entirely no screen

Remove SMPS output connector

(connect Video B d only)

Normal

Power on

Normal

SMPS Output

Voltage

Normal

Logic Connect Power

LED Light-on

(Power, Sink)

Normal

X-B d Connect Power

Abnormal

5V Output

Abnormal

AC Input

Normal

Replace SMPS

Replace Logic B d

Normal

Replace Video B d

Change Fuse

X-B d Output

Normal

Y-B d Connect Power

Y-B d Output

Normal

Replace Panel

Abnormal

Replace X-B d

Abnormal

Replace Y-B d

6-2 Samsung Electronics

Alignment and Adjustments

6-2 Partly no screen

Power on

Upper part no screen

No

Lower part no scree

No

1//14 Screen part

Abnormal

No

1/28 no screen

Yes

Replace Upper Scan Buffer B d

Replace Lower Scan Buffer B d

Replace Corresponding

Address Buffer B d

Replace Panel

No

1/7 no screen

Yes

Replace Panel

Troubleshooting

Samsung Electronics 6-3

6-3 Checking the Board (Unit)

6-3-1 Y buffer

- To check the main board, you have to check the Y buffer first.

- After separating Y Main and Y buffer board,

- Check the Diode between OUTL and OUTH, and make sure that the forward voltage drop is between

0.4 and 0.5V.

- Check that the resistance between the two terminals is more than several kW.

Troubleshooting

6-4 Samsung Electronics

6-3-2 Y Main

- After connecting Y main and Y buffer board, check that one of the output waveforms from OUT 1, 2, 3 or 4 is the same as that of the appendix 1 when power is supplied.

Troubleshooting

Samsung Electronics 6-5

6-3-3 X Board

- Check that one of the output waveforms from X-OUT 1 or 2 is the same as that of the appendix 2 when power is supplied.

X- OUT1

Troubleshooting

6-6 Samsung Electronics

6-3-4 SMPS

- Check output voltage.

- If output voltage is not detected, check the following lists:

(1) Check fuse (2) In case of +5V(D), check that D305 is short (3) In case of VSAMP, check that D506 is short (4) In case of VA, check that D303 is short (5) In case of VS, check that pin 2 and 3 of Q303 are short (6) In case of Q6S, check that pin 2 and 3 are short (7) Check that BRD101S is short