Samsung LN19A330J1D Schematic

LCD-TV

Chassis : N45C Model : LN19A330J1D

Manual

SERVICE

TFT-LCD TV Contents

1. Precautions

2. Product specications Disassembly and Reassembly

3. Troubleshooting

4. Exploded View & Part List

5. Wiring Diagram

6. Schematic Diagram

LN19A330J1D

Refer to the service manual in the GSPN (see the rear cover) for the more information.

Contents

1. Precautions ..............................................................................................................1-1

1-1. Safety Precautions .........................................................................................................1-1

1-2. Servicing Precautions .....................................................................................................1-2

1-3. Electrostatically Sensitive Devices (ESD) Precautions ..................................................1-2

1-4. Installation Precautions ..................................................................................................1-3

2. Product specications ............................................................................................2-1

2-1. Feature & Specications .................................................................................................2-1

2-3. Spec Comparison to the Old Models ..............................................................................2-4

2-4. Accessories ....................................................................................................................2-5

3. Disassembly and Reassemble ............................................................................... 3-1

3-1. Disassembly ...................................................................................................................3-1

4. Troubleshooting ......................................................................................................4-1

4-1. Troubleshooting ..............................................................................................................4-1

4-2. Alignments and Adjustments ...................................................................................

4-3. Factory Mode Adjustments ....................................................................................

4-4. White Balance - Calibration ..........................................................................................4-28

4-5. White Ratio (Balance) Adjustment ................................................................................4-30

4-6. Servicing Information ....................................................................................................4-31

.....4-19

.......4-20

5. Exploded View & Part List ...................................................................................... 5-1

5-1. LN19A330J1D Exploded View ........................................................................................5-1

5-3. LN19A330J1D Parts List ................................................................................................5-3

6. Wiring Diagram ........................................................................................................6-1

6-1. Wiring Diagram ...............................................................................................................6-1

6-2. Cables ............................................................................................................................6-3

7. Schematic Diagram ................................................................................................. 7-1

7-1. MSD2248AL Block Diagram ...........................................................................................7-1

7-2. Slim Half Tuner Block Diagram .......................................................................................7-2

7-3. Internal Block Diagram of Scaler(MSD2248AL) .............................................................7-3

7-2. Schematic Diagrams ......................................................................................................7-4

GSPN (Global Service Partner Network)

Area Web Site

North America http://service.samsungportal.com

America http://latin.samsungportal.com

Latin CIS http://cis.samsungportal.com Europe http://europe.samsungportal.com China http://china.samsungportal.com Asia http://asia.samsungportal.com Mideast

This

Any unauthorized use of Manual can be punished under applicable International and/or domestic law.

& Africa http://mea.samsungportal.com

Service Manual is a property of Samsung Electronics Co.,Ltd.

Printed in Korea P/N: BN82-00364A-00

1. Precautions

1-1. Safety Precautions

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

1-1-1. Warnings

For continued safety, do not attempt to modify the circuit board.

1. Disconnect the AC power and DC power jack before servicing.

1-1-2. Servicing the LCD TV

When servicing the LCD TV, Disconnect the AC line cord from the AC outlet.

1. It is essential that service technicians have an accurate voltage meter available at all times. Check the calibration of

2. this meter periodically.

1-1-3. Fire and Shock Hazard

Before returning the LCD TV to the user, perform the following safety checks:

Inspect each lead dress to make certain that the leads are not pinched or that hardware is not lodged between the

1. chassis and other metal parts in the LCD TV.

Inspect all protective devices such as nonmetallic control knobs, insulating materials, cabinet backs, adjustment and

2. compartment covers or shields, isolation resistorcapacitor networks, mechanical insulators, etc.

Leakage Current Hot Check (Figure 1-1):

3. WARNING : Do not use an isolation transformer during this test. Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7).

(READING SHOULD) NOT BE ABOVE 0.5mA

DEVICE UNDER TEST

TEST ALL

EXPOSED METAL

SURFACES

2-WIRE CORD

*ALSO TEST WITH

PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. With the unit’s AC switch

LEAKAGE CURRENT TESTER

EARTH

GROUND

Figure 1-1. Leakage Current Test Circuit

rst 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: metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat the test.

1-1-4. Product Safety Notices

Some electrical and mechanical parts have special safetyrelated characteristics which are often not evident from visual inspection. The protection they give may not be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identied by on schematics and parts lists. A substitute replacement that does not have the same safety characteristics as the recommended replacement part might create

shock, re and/or other hazards. Product safety is under review continuously and new instructions are issued whenever

appropriate.

1-1

1-2

1. Precautions

1-2. Servicing Precautions

WARNING: An electrolytic capacitor installed with the wrong polarity might explode. Caution: Before servicing units covered by this service manual, read and follow the Safety Precautions section of

this manual.

Note: If unforeseen circumstances create conict between the following servicing precautions and any of the

safety precautions, always follow the safety precautions.

1-2-1 General Servicing Precautions

Always unplug the unit’s AC power cord from the AC power source and disconnect the DC Power Jack before

1. attempting to: (a) remove or reinstall any component or assembly, (b) disconnect PCB plugs or connectors, (c) connect a test component in parallel with an electrolytic capacitor.

Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes

2. used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to their original position.

After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that

3. the area around the serviced part has not been damaged.

Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels,

4. input terminals and earphone jacks).

Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON.

5. Connect an insulation resistance meter (500 V) to theblades 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.

Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead;

6. always remove the instrument’s ground lead last.

1-3. Electrostatically Sensitive Devices (ESD) Precautions

Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly

called Electrostatically Sensitive Devices (ESD). Examples of typical ESD are integrated circuits and some eld-effect

transistors. The following techniques will reduce the incidence of component damage caused by static electricity.

Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge from your

1. body by touching a known earth ground. Alternatively, wear a discharging wrist-strap device. To avoid a shock hazard, be sure to remove the wrist strap before applying power to the LCD TV.

After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent

2. accumulation of an electrostatic charge.

Do not use freon-propelled chemicals. These can generate electrical charges sufcient to damage ESDs.

3. Use only a grounded-tip soldering iron to solder or desolder ESDs.

Use only an anti-static solder removal device. Some solder removal devices not classied as “anti-static” can generate

electrical charges sufcient to damage ESDs.

Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs

6. are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive materials.

Immediately before removing the protective material from the leads of a replacement ESD, touch the protective

7. material to the chassis or circuit assembly into which the device will be installed. Caution: Be sure no power is applied to the chassis or circuit and observe all other safety precautions.

Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together,

or lifting your foot from a carpeted oor can generate enough static electricity to damage an ESD.

1. Precautions

1-4. Installation Precautions

For safety reasons, more than two people are required for carrying the product.

Keep the power cord away from any heat emitting devices, as a melted covering may cause re or electric shock.

2. Do not place the product in areas with poor ventilation such as a bookshelf or closet. The increased internal

temperature may cause re.

Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed

to moisture. Otherwise, it may cause a re or electric shock.

Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product. Also check

the antenna cable or the external connectors if they are fully unplugged. Damage to the cord may cause re or electric

shock.

Keep the antenna far away from any high-voltage cables and install it rmly. Contact with the highvoltage cable or the

antenna falling over may cause re or electric shock.

When installing the product, leave enough space (10cm) between the product and the wall for ventilation purposes.

A rise in temperature within the product may cause re.

1-3

1. Precautions

Memo

1-4

2. Product specications

2-1. Feature & Specications

Model LN19A330J1D

Feature

Digital-TV, RF, 1-HDMI, 1-Component, 1-A/V, 1-S-Video, D-SUB

�

Brightness : 300cd/m

�

Contrast Ratio : 1000:1

�

Response time : 5ms

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Item Description

Specications

2. Product specications

LCD Panel TFT-LCD panel, RGB vertical stripe, TN mode, Normally white, 19-inch viewable,

Scanning Frequency Horizontal : 30 kHz ~ 80 kHz (Automatic)

Display Colors 16.7 million colors

Maximum resolution Horizontal : 1440 Pixels

Input Signal Analog 0.7 Vp-p ± 5% positive at 75Ω , internally terminated

Input Sync Signal H/V Separate, TTL, P. or N.

Maximum Pixel Clock rate 310MHz

Active Display Horizontal/Vertical 16.07 x 10.05 inches(408.24(H) x 255.15(V)mm)

AC power voltage & Frequency AC 110V ~ 220V, 60 Hz

Power Consumption <245 W ( < 1W, stand by )

Dimensions

Set (W x D x H)

Weight (Set) 11.24 lbs (5.1kg)

TV System Tuning Frequency Synthesize (Refer to detailed Frequency Table)

0.2835(H) x 0.2835(W) x 3mm pixel pitch

Vertical : 56 Hz ~ 75 Hz (Automatic)

Vertical : 900 Pixels

18.78 x 7.09 x 15.24 inches (477.1 x 180.2 x 387 mm)_with stand

18.78 x 2.26 x 13.63 inches (477.1 x 57.5 x 346.1 mm)_without stand

System ATSC, NTSC5.38

Sound NTSC-M, AC-3 Digital

Environmental Considerations Operating Temperature : 50˚F ~ 104˚F (10˚C ~ 40˚C)

Operating Humidity : 10% ~ 80%, non-condensing Storage temperature : -13˚F ~ 113˚F (-25˚C ~ 45˚C) Storage Humidity : 5% ~ 95%, non-condensing

Environmental Considerations - MAX Internal speaker Out : Right => 10W, Left => 10W

- BASS Control Range : -8 dB ~ + 8dB

- TREBLE Control Range : -8 dB ~ +8 dB

- Headphone Out : 10 mW MAX

- Output Frequency : RF : 80 Hz ~ 15 kHz

A/V : 80 Hz ~ 20 kHz

Note: Anynet+

2-1

2. Product specications

OSD CH NO AIR CH NO CH NO CH NO

Air-DTV Air-NTSC BAND Cable STD BAND Cable HRC Cable IRC 1 1 A-8 72. 00 A-8 73. 25 2 2 57 55. 25 V-L 2 55. 25 V-L 2 54. 00 2 55. 25 3 3 63 61.25 V-L 3 61.25 V-L 3 60.00 3 61.25 4 4 69 67.25 V-L 4 67.25 V-L 4 66.00 4 67.25 5 5 79 77. 25 V-L 5 77. 25 V-L A-7 78. 00 A-7 79. 25 6 6 85 83.25 V-L 6 83.25 V-L A-6 84.00 A-6 85.25 7 7 177 175. 25 V-H 7 175. 25 V-H 7 174. 00 7 175. 25 8 8 183 181.25 V-H 8 181.25 V-H 8 180.00 8 181.25 9 9 189 187.25 V-H 9 187.25 V-H 9 186.00 9 187.25

10 10 195 193.25 V-H 10 193.25 V-H 10 192.00 10 193.25 11 11 201 199.25 V-H 11 199.25 V-H 11 198.00 11 199.25 12 12 207 205.25 V-H 12 205.25 V-H 12 204.00 12 205.25 13 13 213 211.25 V-H 13 211.25 V-H 13 210.00 13 211.25 14 14 473 471. 25 UHF A 121. 25 MID A 120. 00 A 121. 25 15 15 479 477.25 UHF B 127.25 MID B 126.00 B 127.25 16 16 485 483.25 UHF C 133.25 MID C 132.00 C 133.25 17 17 491 489.25 UHF D 139.25 MID D 138.00 D 139.25 18 18 497 495.25 UHF E 145.25 MID E 144.00 E 145.25 19 19 503 501.25 UHF F 151.25 MID F 150.00 F 151.25 20 20 509 507.25 UHF G 157.25 MID G 156.00 G 157.25 21 21 515 513.25 UHF H 163.25 MID H 162.00 H 163.25 22 22 521 519.25 UHF I 169.25 MID I 168.00 I 169.25 23 23 527 525.25 UHF J 217. 25 SUPER J 216. 00 J 217. 25 24 24 533 531.25 UHF K 223.25 SUPER K 222.00 K 223.25 25 25 539 537.25 UHF L 229.25 SUPER L 228.00 L 229.25 26 26 545 543.25 UHF M 235.25 SUPER M 234.00 M 235.25 27 27 551 549.25 UHF N 241.25 SUPER N 240.00 N 241.25 28 28 557 555.25 UHF O 247.25 SUPER O 246.00 O 247.25 29 29 563 561.25 UHF P 253.25 SUPER P 252.00 P 253.25 30 30 569 567.25 UHF Q 259.25 SUPER Q 258.00 Q 259.25 31 31 575 573.25 UHF R 265.25 SUPER R 264.00 R 265.25 32 32 581 579.25 UHF S 271.25 SUPER S 270.00 S 271.25 33 33 587 585.25 UHF T 277.25 SUPER T 276.00 T 277.25 34 34 593 591.25 UHF U 283.25 SUPER U 282.00 U 283.25 35 35 599 597.25 UHF V 289.25 SUPER V 288.00 V 289.25 36 36 605 603.25 UHF W 295.25 SUPER W 294.00 W 295.25 37 37 611 609.25 UHF AA 301.25 HYPER AA 300.00 AA 301.25 38 38 617 615.25 UHF BB 307.25 HYPER BB 306.00 BB 307.25 39 39 623 621.25 UHF CC 313.25 HYPER CC 312.00 CC 313.25 40 40 629 627.25 UHF DD 319.25 HYPER DD 318.00 DD 319.25 41 41 635 633.25 UHF EE 325.25 HYPER EE 324.00 EE 325.25 42 42 641 639.25 UHF FF 331.25 HYPER FF 330.00 FF 331.25 43 43 647 645.25 UHF GG 337.25 HYPER GG 336.00 GG 337.25 44 44 653 651.25 UHF HH 343.25 HYPER HH 342.00 HH 343.25 45 45 659 657.25 UHF II 349.25 HYPER II 348.00 II 349.25 46 46 665 663.25 UHF JJ 355.25 HYPER JJ 354.00 JJ 355.25 47 47 671 669.25 UHF KK 361.25 HYPER KK 360.00 KK 361.25 48 48 677 675.25 UHF LL 367.25 HYPER LL 366.00 LL 367.25 49 49 683 681.25 UHF MM 373.25 HYPER MM 372.00 MM 373.25 50 50 689 687.25 UHF NN 379.25 HYPER NN 378.00 NN 379.25 51 51 695 693.25 UHF OO 385.25 HYPER OO 384.00 OO 385.25 52 52 701 699.25 UHF PP 391.25 HYPER PP 390.00 PP 391.25 53 53 707 705.25 UHF QQ 397.25 HYPER QQ 396.00 QQ 397.25 54 54 713 711.25 UHF RR 403.25 HYPER RR 402.00 RR 403.25 55 55 719 717.25 UHF SS 409.25 HYPER SS 408.00 SS 409.25 56 56 725 723.25 UHF TT 415.25 HYPER TT 414.00 TT 415.25 57 57 731 729.25 UHF UU 421.25 HYPER UU 420.00 UU 421.25 58 58 737 735.25 UHF VV 427.25 HYPER VV 426.00 VV 427.25 59 59 743 741.25 UHF WW 433.25 HYPER WW 432.00 WW 433.25 60 60 749 747.25 UHF XX 439.25 HYPER XX 438.00 XX 439.25 61 61 755 753.25 UHF YY 445.25 HYPER YY 444.00 YY 445.25 62 62 761 759.25 UHF ZZ 451.25 HYPER ZZ 450.00 ZZ 451.25 63 63 767 765.25 UHF AAA 457.25 HYPER AAA 456.00 AAA 457.25 64 64 773 771.25 UHF BBB 463.25 HYPER BBB 462.00 BBB 463.25 65 65 779 777.25 UHF CCC 469.25 ULTRA CCC 468.00 CCC 469.25 66 66 785 783.25 UHF DDD 475.25 ULTRA DDD 474.00 DDD 475.25 67 67 791 789.25 UHF EEE 481.25 ULTRA EEE 480.00 EEE 481.25 68 68 797 795.25 UHF FFF 487.25 ULTRA FFF 486.00 FFF 487.25 69 69 803 801.25 UHF GGG 493.25 ULTRA GGG 492.00 GGG 493.25

CHANNEL FREQUENCY TABLE

OUTPUT FREQUENCY : ANALOG fv:45.75MHz, fs:41.25MHz DIGITAL Fc:44MHz

TUNING STEP SIZE : FIRST PLL 250KHz SECOND PLL 62.5KHz

2-2

2. Product specications

OSD CH NO AIR CH NO CH NO CH NO

Air-DTV Air-NTSC BAND Cable STD BAND Cable HRC Cable IRC

70 70 HHH 499.25 ULTRA HHH 498.00 HHH 499.25 71 71 III 505.25 ULTRA III 504.00 III 505.25 72 72 JJJ 511.25 ULTRA JJJ 510.00 JJJ 511.25 73 73 KKK 517.25 ULTRA KKK 516.00 KKK 517.25 74 74 LLL 523.25 ULTRA LLL 522.00 LLL 523.25 75 75 MMM 529.25 ULTRA MMM 528.00 MMM 529.25 76 76 NNN 535.25 ULTRA NNN 534.00 NNN 535.25 77 77 OOO 541.25 ULTRA OOO 540.00 OOO 541.25 78 78 PPP 547.25 ULTRA PPP 546.00 PPP 547.25 79 79 79 553.25 ULTRA 79 552.00 79 553.25 80 80 80 559.25 ULTRA 80 558.00 80 559.25 81 81 81 565.25 ULTRA 81 564.00 81 565.25 82 82 82 571.25 ULTRA 82 570.00 82 571.25 83 83 83 577.25 ULTRA 83 576.00 83 577.25 84 84 84 583.25 ULTRA 84 582.00 84 583.25 85 85 85 589.25 ULTRA 85 588.00 85 589.25 86 86 86 595.25 ULTRA 86 594.00 86 595.25 87 87 87 601.25 ULTRA 87 600.00 87 601.25 88 88 88 607.25 ULTRA 88 606.00 88 607.25 89 89 89 613.25 ULTRA 89 612.00 89 613.25 90 90 90 619.25 ULTRA 90 618.00 90 619.25 91 91 91 625.25 ULTRA 91 624.00 91 625.25 92 92 92 631.25 ULTRA 92 630.00 92 631.25 93 93 93 637.25 ULTRA 93 636.00 93 637.25 94 94 94 643.25 ULTRA 94 642.00 94 643.25 95 95 A-5 91. 25 FM A-5 90. 00 A-5 91. 25 96 96 A-4 97.25 FM A-4 96.00 A-4 97.25 97 97 A-3 103.25 FM A-3 102.00 A-3 103.25 98 98 A-2 109.25 MID A-2 108.00 A-2 109.25

99 99 A-1 115.25 MID A-1 114.00 A-1 115.25 100 100 100 649. 25 ULTRA 100 648. 00 100 649. 25 101 101 101 655.25 ULTRA 101 654.00 101 655.25 102 102 102 661.25 ULTRA 102 660.00 102 661.25 103 103 103 667.25 ULTRA 103 666.00 103 667.25 104 104 104 673.25 ULTRA 104 672.00 104 673.25 105 105 105 679.25 ULTRA 105 678.00 105 679.25 106 106 106 685.25 ULTRA 106 684.00 106 685.25 107 107 107 691.25 ULTRA 107 690.00 107 691.25 108 108 108 697.25 ULTRA 108 696.00 108 697.25 109 109 109 703.25 ULTRA 109 702.00 109 703.25 110 110 110 709.25 ULTRA 110 708.00 110 709.25 111 111 111 715.25 ULTRA 111 714.00 111 715.25 112 112 112 721.25 ULTRA 112 720.00 112 721.25 113 113 113 727.25 ULTRA 113 726.00 113 727.25 114 114 114 733.25 ULTRA 114 732.00 114 733.25 115 115 115 739.25 ULTRA 115 738.00 115 739.25 116 116 116 745.25 ULTRA 116 744.00 116 745.25

. .

. . .

. . . .

. .

. . .

. . . .

125 125 125 799.25 ULTRA 125 798.00 125 799.25

. . . . . . . . .

2-3

2. Product specications

2-3. Spec Comparison to the Old Models

Model LN**A450C1D(19”/22”/26”/32”/37”/40”) LNT**42H (23”/26”/32”/40”/46”)

Design

Display Type LCD TV LCD TV

Built-in Tuner O O

19”=>1440 x 900

Resolution

LCD Panel TFT LCD Panel 60Hz TFT LCD Panel 60Hz

Screen Size 19”/22”/26”/32”/37”/40” 23” / 26” / 32” / 40” / 46”

Picture ratio 16 : 9 16 : 9

18.78 x 7.09 x 15.24 inches_with stand

Dimensions (W x H x D)

31.48 x 11.81 x 25.91 inches_with stand

36.08 x 11.81 x 25.91 inches_with stand

38.97 x 11.81 x 27.33 inches_with stand

22”=>1680 x 1050

26”/32”/37”/40”=>1366x768

21.96 x 8.5 x 17.83 inches_with stand

26.37 x 8.5 x 19.7 inches_with stand

1366 x 768

26.29 x 9.13 x 17.53 inches_with stand

29.28 x 9.15 x 19.94 inches_with stand

34.42 x 11.47 x 22.72 inches_with stand

42.67 x 11.81 x 27.17 inches_with stand

48.04 x 12.83 x 30.55 inches_with stand

Weight

Brightness 500nit (19”=>300nit) 500 nit

Contrast Ratio 8000:1 (19”=>1000:1) 8000:1

Picture Enhacer DNIe(FBE3) DNIe (FBE2)

Equalizer 5 band 5 band

Auto Motion Plus 120Hz Not available Not available

Surround Sound 2 Way SRS TruSurround Dolby Digital 2 Way SRS TruSurround Dolby Digital

Speaker Output 5W x 2 5W x 2

Antenna 1 (Cable/Air) 2 (Cable/Air)

11.24 lbs(set)

16.09 lbs(set)

21.38 lbs(set)

28.88 lbs(set)

40.34 lbs(set) 41 lbs(set)

24.25 lbs (set)

31.97 lbs (set)

41.89 lbs (set)

60.63 lbs (set)

80.91 lbs (set)

2-4

2-4. Accessories

Product Description Code. No Remark

2. Product specications

Remote Control & Batteries

(AAA x 2)

Power Cord 3903-000144

Cover-Bottom BN63-04243A

Owner’s Instructions BN63-01395B

Cleaning Cloth BN63-01798A

Warranty Card / Registration

Card / Safety Guide Manual

(Not available in all locations)

BN59-00599A

6801-001011

Samsung Electronics

Service center

2-5

4. Troubleshooting

Power Board

Main Board

Panel

4-1. Troubleshooting

Check the various cable connections rst.

• Check to see if there is a burnt or damaged cable.

• Check to see if there is a disconnected or loose cable connection.

• Check to see if the cables are connected according to the connection diagram. Check the power input to the Main Board.

4. Troubleshooting

4-1

4. Troubleshooting

4-1-1. No Power

Symptom

Major

checkpoints

The IP relay or the LEDs on the front panel does not work when connecting the power cord if the cables are improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:

The LEDs on the front panel do not work when connecting the power cord. The SMPS relay does not work when connecting the power cord. The units appears to be dead.

Check the internal cable connection status inside the unit. Check the fuses of each part. Check the output voltage of SMPS. Replace the Main Board.

Diagnostics

Lamp(Backlight) Off, power indicator

LED on?

Yes

Does proper Stand-By DC

A5V appear at C223?

Yes

Does proper Main DC B10V_S, B5V,

B13V appear at BD221, C273C C278?

Yes

Does proper Inverter DC 120V appear

at CN101 in SMPS?

Yes

Does proper DC A3.3V appear at D206?

Yes

Does proper DC B3.3V appear at

R203?

Yes

Does proper A1.2V appear at C208?

Check a connection power cable.

P/N : BP39-00028A

Change the Main Power assembly

19” => BN44-00152B 22” => BN44-00152A

Check IC203 Change the Main Ass`y

19” : BN94-01638A 22” : BN94-01638B

Check IC203

Change the Main Ass`y

19” : BN94-01638A 22” : BN94-01638B

Check IC402

Change the Main Ass`y

19” : BN94-01638A 22” : BN94-01638B

4-2

Caution

Make sure to disconnect the power before working on the IP board.

4-1-2. No Video (Analog PC signal)

Symptom Audio is normal but no picture is displayed on the screen.-

Major

checkpoints

Check the PC source

Check the MSD2248AL This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

4. Troubleshooting

Diagnostics

Power Indicator is off.

Lamp(Backlight) Off, no video

Yes

Check the PC source and

check the connection of DSUB?

Yes

Does the signal appear at

#w1, #u1, #AB2, #F1, #G1

(R, G, B, H, V) of IC402?

Yes

Does the digital data appear at output of

R452, R453, R402, R403, R404?

Yes

Does the digital data appear at output

of C609 and C610?

Yes

Check the LVDS cable?

Replace the LCD panel?

Input an analog PC signal.

Check the connected cable.

Check IC601, PC cable.

Change the PC cable. Change the main

PCB assembly

Check IC402 Change the main PCB

assembly

Check IC402

Change the main PCB assembly

Please, Contact Tech support

Caution Make sure to disconnect the power before working on the IP board.

4-3

4. Troubleshooting

WAVEFORMS

1 2

PC Input (V-Sync, H-Sync)

LVDS Out (CLK + / -)

4-4

4-1-3. No Video (HDMI - Digital Signal)

Symptom Audio is normal but no picture is displayed on the screen.-

Major

checkpoints

Check the HDMI source

Check the MSD2248AL This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.

4. Troubleshooting

Power Indicator is off.

Lamp(Backlight) Off, no video

Yes

Diagnostics

Caution Make sure to disconnect the power before working on the IP board.

Check the HDMI source and check

the connection of HDMI cable?

Yes

Does the digital data appear at output of

R659, R660(CLK+/-),

R661~R666(DATA)?

Yes

R452, R453, R402, R403, R404?

Yes

Check the LVDS cable?

Replace the LCD panel?

Input an HDMI signal.

Check the connected cable.

Check U601, HDMI cable.

Change the HDMI cable. Change

the main PCB assembly

Check IC4001

Change the main PCB assembly

Please, Contact Tech support

4-5

4. Troubleshooting

WAVEFORMS

4 5

HDMI Input (CLK + / -)

Tuner CVBS Out (Pattern: Grey Bar)

TS DATA Out (Clk, Data [0])

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