Samsung HPL5025X-XAA, PPM50H2X-XAA Service Manual

PLASMA DISPLAY TV

Chassis : D52A Model: HPL5025X/XAA

PPM50H2X/XAA

PLASMA DIAPLAY TV CONTENTS

Precautions

Reference Information

Specifications

Exploded View and Parts List

Alignment and Adjustments

Circuit Operation Description

Troubleshooting

Handling Description

Wiring Diagram

Electric Parts List

Glossary

Schematic Diagrams

10.

11.

12.

ELECTRONICS

Printed in Korea

AA68-

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.

Precautions

Samsung Electronics 1-1

LEAKAGE CURRENT

TESTER

DEVICE UNDER

TEST

TEST ALL

EXPOSED METAL

SURFACES

3-WIRE CORD

ALSO TEST WITH PLUG REVERSED

(USING AC ADAPTER

PLUG AS REQUIRED)

EARTH

GROUND

(READING SHOULD

NOT BE ABOVE

3.5mA)

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)

7. 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.

8. 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.

9. 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.

10. 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.

11. 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.

12. 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.

13. 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.

14. 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.

15. Littum battery replace warning: Danger of explosion if battery is incorrectly replaced, Replace only with the same or eqivalent type.

Precautions

1-2 Samsung Electronics

“CAUTION, Double-pole/neutral fusing”

CAUTION

Danger of explosion if battery is incorrectly replaced.

Replace only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer’s instructions.

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.

Specifications

Samsung Electronics 3-1

3. Specifications

MODEL

SCREEN SIZE

3-1 Display(PDP Monitor)

Display

Remote Control

Display

Remote Control

Front

Back

Power Supply

Power Consumption

Screen Size

Adjustment System

Dimensions

(mm/inch)

Terminal

In/Out

Terminals

HPL5025/PPM50H2

16:9

1208.5(W) x 89(D) x 724(H) mm/47.58(W) x 3.5(D) x 28.50(H) Inches

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

42Kg/92.59Ibs

150g/0.33Ibs

POWER Button, SOURCE, MENU, VOLUME, SELECT, MUTE

Exrernal Speaker Out, RGB1In (mD-Sub 15pin), RGB2 In(BNC jack)

SD/HD Cpmponent Video In, VIDEO In, S-VHS In,

Audio In(Video, Component, PC), RC-2332C In,

RS-232C Out (PPM50H2 Only), AC 120V

AC120V 60Hz

540W

1106.5(H) x 622(V)/43.56 x 24.49

Electronic Function Adjustment

Specifications

3-2 Samsung Electronics

MENO

Exploded View and Parts List

Samsung Electronics 4-1

4. Exploded View and Parts List

4-1 HPL5025X/XAA

Exploded View and Parts List

4-2 Samsung Electronics

NO PART DESCRIPTION CODE NO SPEC. Q’Ty REMARK

1 CABIN ET- FRONT AA64- 01548B HIPS V0 GRAY 1 2 BADGE - BRAND AA64- 01560B AL FORGING,SS 1 3 KNOB- MASTE R AA64-0 1566B ABS H B BLK 1 4 SPRING-CS AA61- 60003J SUS 304 1 5 BRACKET- F ILT ER,SIDE,ASSY AA61- 01004A 50P2 AL 6063 2 6 SCREW- T APTITE 6003-001020 RH,M4 *L10 YEL 12 7 ASSY- P CB,REMOCON AA95- 01208A D52A 1 8 SCREW- T APTITE 6003-001023 M3 * L 10 YEL 2

9 BRACKE T- FILT E R,BOT,ASS Y AA61- 01005A 50P2 AL 6063 1 10 SCREW- T APT ITE 6003- 001020 RH ,M4*L10 YEL 9 11 SCREW- ASSY,MACHINE 6006- 001035 WSP,PH,M3*L8YEL 2 12 ASSY- PCB,POWER ON/OFF AA95- 01211A HPL5025M,D52A 1 13 BRACKET - POWER AA61- 00716A SECC T 1 .0 1 14 SCREW- T APT ITE 6003- 001026 RH,+ ,B,M4 *L15 2 15 EMI- F ILTER AA95- 01207A HPL5025M,D52A 1 16 SPONGE- EMI,FILTER AA72- 00015A SHIELD-FORMT1 .2 2 17 BRACKET - FILTE R,T OP ,ASS Y AA61- 01003A 50P2 AL 6063 1 18 SCREW- T APT ITE 6003- 001020 RH ,M4*L10 YEL 7 19 SP ACER- FILTER AA60- 00110B P/U VO 2 20 ASS Y- P CB,CONTROL AA95- 01210A HPL5025M,D52A 1 21 KNOB- CON T ROL AA64- 01565B ABS HB BAK 1 22 SCREW- T APT ITE 6003- 001026 RH,+ ,B,M4 *L15 2 23 SPONGE- EMI,FILTER AA72- 00016A SHIELD-FORMT1 .2 2 24 SP ACER- FILTER AA60- 00110A P/U VO 2 25 ASSY- MODULE- 3 AA98- 00136A HPL5025M,D52A 1 26 SCREW- T APT ITE 6003- 001026 RH,+ ,B,M4 *L15 31 27 COVER- TERMINAL AA63- 00368B SUS T0 .5 1 28 SCREW- T APT ITE 6003- 001023 M3 * L10 YEL 4 29 B RAC K ET- E XTERNAL AA61- 00578B SPC T 1.0 1 30 ASSY- PCB,TERMINAL AA95- 01209A HPL5025M,D52A 1 31 SCREW- ASSY,MACHINE 6006- 001035 WSP,PH,M3*L8YEL 2 32 GU IDE- S TAND AA61- 00584B AL DIEC ASTIN G 2 33 SCREW- ASSY,MACHINE 6006- 001039 WSP,PH,M4*L12YEL 12 34 BRACKET - WALL AA61-00569A SECC T 2.0 2 35 SCREW- ASSY,MACHINE 6006- 001039 WSP,PH,M4*L12YEL 16 36 B RAC K ET- AV AA61- 00580B SPC T 1.0 1 37 ASSY- PCB,SOUND AA95- 00931A SPD- 50P2HM,D52A 1 38 SCREW- ASSY,MACHINE 6006- 001035 WSP,PH,M3*L8YEL 4 39 BRACKET - LINE,F ILT ER AA61- 00582B SPC T1 .0 1 40 ASS Y- P CB,POWER,AC B’d AA95- 01212A HPL5025M,D52A 1

Samsung Electronics 4-3

Exploded View and Parts List

NO PART DESCRIPTION CODE N O SPEC. Q’Ty REMARK

41 SCREW- ASSY,MACHINE 6006-001035 WSP,PH,M3*L8YEL 10 42 BRACKET- NOISE,F ILT ER AA61- 00589B SUS T 0.5 1 43 BRACK ET- SCALE R, SU B AA61-0 0581B SPC T 0.5 1 44 SCREW- ASSY,MACHINE 6006-001035 WSP,PH,M3*L8YEL 6 45 ASSY- P CB,MAIN(OPT) AA94- 05542A HPL5025M,D52A 1 46 BRACK ET- SCALE R, MAIN AA61- 00573B SPC T 1 .0 2 47 SCREW- ASSY,MACHINE 6006-001035 WSP,PH,M3*L8YEL 6 48 BRACKET- F AN,BASE AA61- 005 79B SECC T 1.6 5 49 FAN 50 SCREW- ASSY,MACHINE 6006-001017 WSP,PH,M4*L35YEL 10 51 SCREW- ASSY,MACHINE 6006-001035 WSP,PH,M3*L8YEL 10 52 COVER- BACK AA63-00364B AL 3003- 0 T 1.2 1 53 SCREW- T APT IT E 6003- 001019 M4 * L12 YEL 19 54 SCREW- T APT IT E 6003- 001020 M4 * L10 YEL 10 55 SPACER- FAN AA60- 00109A P/U FORM V0 BLK 5 56 HOLDER- F AN AA61- 00597B ABS V0 BL K 5 57 COVER- F AN AA63- 00366B SUS T 0.5 5 58 SCREW- T APT IT E 6003- 001026 M4 * L15 YEL 24 59 CABINET - BACK AA64- 01550B HIP S V0 BLK 1 60 HANDLE- SET AA64- 01551B ABS HB BLK 4 61 COVER- S ET AA63- 00365B ABS H B BLK 2 62 SCREW- ASSY,MACHINE 6006-001035 WSP,PH,M3*L8YEL 6 63 SCREW- ASSY,MACHINE 6006-001017 WSP,PH,M4*L35YEL 2 64 SCREW- ASSY,MACHINE 6006-001112 WSP,PH,M8*L16YEL 6 65 WINDOW- REMOCON AA64- 01549B ACRYL VIOLET 2:1 1 66 ASSY- P CB,SMPS,MAIN AA9 8- 00149A HPL5025M,D52A 1

Exploded View and Parts List

4-4 Samsung Electronics

4-2 PPM50H2/XAA

Samsung Electronics 4-5

Exploded View and Parts List

4-6 Samsung Electronics

Alignment and Adjustments

Samsung Electronics 5-1

5. Alignment and Adjustments

5-1 Service Mode

5-1-1 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. Press the ‘Screen Display – Factory’ button when the system is turned on.

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

5-1-2 Initial DISPLAY State in times of SERVICE MODE Switch overs

PW364

INITIAL DISPLAY

SDA928 0 VP C3230 SDA9400

1, PW

364

2, SD

A928 0

3, V

PC3230

4, SD

A940 0

5, C

XA2101

6, A

D98 84

7, O

SD POSITION

8, O

PTION

9, R

ESET

10, A

GING

orizont alSize

er tical Horizontal Ve r t i c a l

Pos

CTIT

HRESH

CTIT

RAWID

Y- D

ELAY

PF GAIN

PF GA IN

ACOM

RIGHT YUV

ONT YUV

FCOMP

ChromaB

and

uma LPF

PLL Speed

uma Delay

3230 Bri

ght

3230 C

ontr ast

PF Y/C

PF Chroma

HHPeak Fil

ter

PeakingG

ain

oaring off / on

UT DELA Y

TNRCLY

CLY

TNRCLC

CLY

OP MODE

Alignment and Adjustments

5-2 Samsung Electronics

5-1-3 Buttons Operations within SERVICE MODE

#Notice

The existing service data may be deleted after downloading a program. Be sure to make a backup copy of your data before downloading and then restore the data after completing the download.

Channel UP/DOWN

Volume UP/DOWN

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

Limit Level Sys t em D-Color R-DRIVE

-DRIVE

B R-Cutoff G-Cutoff

-C ut off

B ABL MODE ABL TH HSEPSEL CONT RAST BRI GHT CR OFFSET CB

OFFSET1

CXA2101 AD9884

DRIVE SUB BRI GHT SUB CONT SUB COLOR SUB HUE SUB SHP R-Y/R R-Y/B GG-Y/R

-Y/B

ABL LEVEL

SHP FO PRE/OVER CTI LEVEL

LTI LEVEL DC -T RAN D-PIC

RED

Gain GREEN BLUE

OFFSET

RED GREEN BLUE GAIN DRIVE OFFSET DIRVE V CONTRAST V BRIGHT PHASE

CHANGE PUMP

Gain

OFFSET

OSD

POSITION

HORIZ VE RT

OP TION

1, BACK GROUND COLOR

SHIFT P IXEL

PIXEL SHIFT

FAN PROTECT

TEMP

6, 7, 8, BASE LANGUAGE

PROTECT

SHARPNESS

MIN SEC

Alignment and Adjustments

Samsung Electronics 5-3

5-1-4 White Balance Adjust Method

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

2. Enter AD9884

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

4. In AD9884, adjust brightness with V CONTRAST / V BRIGHT for VIDEO / DTV, and adjust with GAIN DRIVE / OFFSET DRIVE for PC.

1. VIDEO MODE (SPR-3100, input TOSHIBA PATTERN)

2. DTV MODE (SPR-3100, input TOSHIBA PATTERN)

dj ustme

Adjus tme

Coor dinates

Value

Deviation

dj ustme

Adjus tme

Coor dinates

Value

Deviation

-LIGHT

x:286 y

274

18.7(fL)

3 3 3

H-LIGHT

-LIGHT

x:278 y

272

:0.53(f L)

(f L)

5 5

0. 1

x:288 y

277

Y: 16.1

3 3 3

x:280 y

:277

0.71

5 5

0. 1

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

Alignment and Adjustments

5-4 Samsung Electronics

2. PC MODE (VG828, input TOSHIBA PATTERN)

dj ustme

Adjus tme

Coor dinates

Value

Deviation

H-LIGHT

-LIGHT

x:287 y:288 Y: 21.3(fL)

x:287 y:294

2.17

3 3 3

5 5

0. 1

Alignment and Adjustments

Samsung Electronics 5-5

5-1-4 SCALAR FACTORY DATA DEFAULT VALUES

Alignment and Adjustments

5-6 Samsung Electronics

Alignment and Adjustments

Samsung Electronics 5-7

5-8 Samsung Electronics

Alignment and Adjustments

HPL5025/PPM50H2

VGA

Video signal Dot X Line

640 X 350

640 X 400

VGA

WVGA

720 X 400

640 X 480

848 X 480

Ve rtical

Frequency (Hz)

70.086

85.080

70.087

85.039

59.940

72.809

75.000

85.008

60.000

72.000

75.000

85.000

56.250

Horizontal

Frequency (kHz)

31.469

37.861

31.469

37.927

31.469

37.861

37.500

43.269

29.838

35.156

36.072

37.650

42.925

Ve rtical

polarity

N/P

Horizontal

polarity

N/P

SVGA

XGA

WXGA

SXGA

800 X 600

1024 X 768

1152 X 864

1280 X 768

1280 X 1024

60.317

72.188

75.000

85.061

60.004

70.069

75.029

84.997

75.000

60.020

75.025

37.879

48.077

46.875

53.674

48.363

56.476

60.023

68.677

67.500

47.700

60.150

63.981

79.976

Alignment and Adjustments

Samsung Electronics 5-9

5-3 Adjusting the Discharge Voltage Of the Main Unit While Replacing ASS'Y (Body Part)

_ Turning the variable resistor clockwise reduces voltage except VG, V9, and VR(6).

OUTPUT

VSET

VSCAN

VSAMP

V5D

VR(6)

VSB

Voltage(V)

See the labels attached on the base chassis

18.3

5.3

5.2

Alignment and Adjustments

5-10 Samsung Electronics

Alignment and Adjustments

5-3 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)

B(BASE)

C (COLLECTOR)

B(BASE)

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 5-11

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

5-12 Samsung Electronics

MEMO

Circuit Operation Description

Samsung Electronics 6-1

6. Circuit Description

6-1 Power supply

6-1-1 Outline(PDP SMPS)

Considering various related conditions, the switching regulator with good efficiency and allowing for its small size and light weight was used as the power supply for PDP 50inch, VS requiring high power consumption used forward converter and 12VSAMP used the simple flyback converter and other high voltage (VSCAN,VSET,VE)used DC/DC converter. To comply with the international harmonics standards and improve the power factor, active PFC(Power Factor Correction) was used to rectify AC input into +400V DC output, which in turns used as input to the switching regulator.

6-1-2 50" SMPS Specification

(1) Input

The power supply shall be capable of supplying full rated output power over free voltage ranges that are rated 100 VAC - 240 VAC RMS nominal. Operating voltage : 90 VAC - 264 VAC. The power supply must be able to start up under peak loading at 90V AC. The power supply shall automatically recover from AC power loss. (Note that nominal voltages for test purposes are considered to be with +/- 1.0V of nominal). +5VSB is a SELV standby voltage that is always present when AC mains voltage present.

(2) Output

This power supply is 13output switching power supply for PDP 50inch. The output voltage, and current

requirements for continuous operation are stated below. (Table1.)

Table1. Specifications of Output Power Supplies for PDP SMPS

Output Name Output Voltage Output Current(Max.) UsinginPDPDriving

Vsustain +160V ~ 200V (165V) 1.8A Sustain Voltage of Drive Board

Vaddress +58V ~ 73V (65V) 0.5A Address Voltage of Drive Board

Vscan +60V ~ 78V (70V) 0.05A

Vset +195V ~ 230V (215V) 0.05A

Ve +180V ~ 210V (185V) 0.05A

Vg +1V ~ 20V (18.4V) 0.3A Driving Voltage of Fet

Vfan +10V ~ 12V (11V) 0.8A Driving Voltage of Fan

V9 +1V ~ 10V (9.0V) 0.3A

V6 +1V ~ 8V (6.0V) 1.0A IC Driving Voltage of Logic Board

V5(D) +5.1V ~ 5.9V (5.4V) 3.5A

Vsb +4.8V ~ 5.4 V (5.2V) 0.4A Standby for Remote Control

V12 +10V ~ 12V (11V) 1.2A

Vsamp +10V ~ 13V (12V) 1.5A Amp Voltage of Audio Board

Circuit Operation Description

6-2 Samsung Electronics

(3) Over voltage Protection

The over voltage sense circuitry and reference shall reside in package that are separate and distinct from the regulator control circuitry and reference. No single point fault shall be able to cause a sustained over voltage condition on any of all outputs. The supply shall provide latch-mode Over Voltage Protection as defined below. (Table2.)

Table2. Over voltage Protection.

(4) Short Circuit and Over current Protection.

An output short circuit is defined as output impedance of less than 300mohms. The power supply shall shutdown and latch off for shorting VS DC rails to return or any other rail. Shorts between main output rails and 5VSB shall not cause any damages to the power supply. The power supply shall either shutdown and latch off for shorting is removed, the P/S shall recover. The power supply shall be capable of withstanding a continuous shot-circuit to the output without damage or over stress to the unit (components, PCB traces, connectors,etc.) under the input conditions specified in Section2 above. Current Protection as defined below. (Table3.)

Table3. Over Current Protection.

Parameter Min Unit

VS(169V) 3.0 ~ A

VA(65V) 2.0 ~ A

5V(D) 10 ~ A

Parameter Min Unit

VS(169V) 195 ~ V

VA(65V) 90 ~ V

5V(D) 5.5 ~ V

Circuit Operation Description

Samsung Electronics 6-3

(5) Function of Board

REMOTE CONTROL Using a 250V/10A relay, the board makes remote control available. FREE VOLTAGE The board is designed so that the input voltage can be used within 90VAC to 264VAC.

Improvement of power factor The board is designed using the active PFC circuit so that the Power Factor can be over 9.0.

Protection The OCP(Over current Protection), OVP(Over voltage Protection), Short Circuit Protection functions are added against system malfunction.

(6) Part Block Diagram and Part Function.

AC-DC Converter The Power supply output +400V DC from the common AC power supply using the active PFC booster converter. This converter is designed for improving the power factor and preventing the noise with high frequency and finally becomes the input power system for the switching regulator on the output side.

Picture1. PFC Drive FET(2SK2372) Drain pulse

Circuit Operation Description

6-4 Samsung Electronics

- Oscillator Frequency Oscillator Frequency is determined by the values of Rt and Ct, which determine the ramp and off-time of the oscillator output clock Oscillator Frequency is derived from the following equation

For the circuit shown in the PDP50, with the oscillator running at

Picture2. PFC Drive FET(2SK2372) Gate pulse

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