Memorex MLT1912 "B" User manual

CAUTION: Before servicing the chassis, read the “IMPORTANT SERVICE SAFETY INFORMATION” section on

page 2 of this manual.

CONTENTS

IMPORTANT SERVICE SAFETY INFORMATION................

DISASSEMBLY FOR REPAIR ...............................................

WIRING DIAGRAM……………………………………....….

EXPLODED VIEW (CABINET).............................................

PARTS LIST ..........................................………….................

Note: Follows a policy of continuous advancements in development. For this reason specifications may be changed without notice.

19" LCD TV W/ATSC & NTSC-M

MEMOREX MLT1912 “B”

SERVICE MANUAL

Y3719(Y371900-17541-004-05-42)

IMPORTANT SERVICE SAFETY INFORMATION

1. Read these Instructions.

2. Keep these Instructions.

3. Heed all Warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with a dry cloth.

7. Do not block any of the ventilation openings. Install in accordance with the manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including

amplifiers) that produce heat.

9. Protect the (AC power converter) power cord from being walked on or pinched particularly at plugs,

convenience receptacles. And the point where they exit from the apparatus.

10. Only use attachments/accessories specified by the manufacturer.

11. Use only with a cart, stand, tripod, bracket, or table specified by the manufacturer, or sold

with the apparatus. When a cart is used, use caution when moving the cart/apparatus

combination to avoid injury from tip-over.

12. Unplug this apparatus during lightning storms or when unused for long periods of time.

13. Refer all servicing to qualified service personnel. Servicing is required when the apparatus

has been damaged in anyway, such as power-supply cord or plug is damaged, liquid has

been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture,

does not operate normally, or has been dropped.

WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.

FCC Information

Warning: Changes or modifications to this unit not expressly approved by the party responsible for compliance could

void the user’s

authority to operate the equipment.

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to

Part 15 of the

FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential

installation. This

equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with

the instructions,

may cause harmful interference to radio communications. However, there is no guarantee that interference will not

occur in a

particular installation. If this equipment does cause harmful interference to radio or television reception, which can

be determined by

turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the

following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio TV technician for help.

In case of malfunction due to electrostatic discharge, reset the apparatus by disconnecting from mains supply.

Standard Television Apparatus - Téléviseur ordinaire, Canada

The AC power cord is polarized (one blade is wider than the other) and only fits into AC outlets one-way. If the

plug will not go into the outlet completely, turn the plug over and try to insert it the other way. If it still will not fit,

contact a qualified electrician to change the outlet or use a different one. Do not attempt to bypass this safety

feature.

IMPORTANT: The power cord can be unplugged to turn off the main power to the unit. It should also be easily

accessible in an emergency.

DISASSEMBLY FOR REPAIR

TO DISASSEMBLY THE FOOT COVER

1. Remove the 2 screws (A) from foot cover and foot stand.

TO REMOVE THE REAR CABINET

2. Remove the 14 screws (B) from the back cabinet.

TO REMOVE THE MAIN PCB SHIELD COVER

3. Remove the 8 screws (C) from the main pcb shield cover.

DISASSEMBLY FOR REPAIR

TO REMOVE THE JACK SHIELD COVER

4. Remove the 7 screws (D) from the jack shield cover.

TO REMOVE THE FRONT CABINET

5. Remove the 14 screws (E) from the front cabinet.

TO REMOVE THE LCD MTG BLK

6. Remove the 4 screws (F) from the LCD MTG BLK.

WIRING DIAGRAM

Ref. No Parts No. Description QTY

185-38190-002 Y3819 INVERTER CHASSIS

SOB-405 (SAQCN) (FOR BOE

19" TFT DIS.);ROHS

AI-Y3419-001 Y3419 (AI) CHASSIS ASSY 1

AI-34190-700 Y3419 (AI) KEY BOARD

CHASSIS ASSY 1

001-34190-700 Y3419 KEY BOARD P.C.B.

(FR4) 2 LAYER

(112.5*33*1.6)MM (ROHS)

SW701,702,703,704,705,7

06,707 020-31100-177 TACT SWITCH SKRGAED010

(ALPS) (RADIAL TAPE 5MM)

(VSG1024-A-T);ROHS

HS-Y3719-

BLK-320 Y3719 H/S BD. W/COSMETIC

(39 KEY) BLACK COLOR 1

001-04020-710 T402 REMOTE HANDSET BD.

P.C.B (94HB) T=1.2MM

(36X146.5)MM (ROHS)

IC501 002-02222-150 IC PT2222-002 (PTC) (ROHS) 1

Q501 003-08050-393 TRANSISTOR 8050C

(KEC)(ROHS) 1

D501 004-01122-600 INFRARED EMITTING DIODES

EL-1L2 (ROHS) 1

D502 004-04148-400 SW. DIODE IN-4148 (ROHS) 1

R501 005-10109-314 RESISTOR 1 OHM +-5% 1/4W

(ROHS) 1

C504,505 006-10201-250 CERAMIC CAP 200 PF +-5%

50V (ROHS) 2

C503 009-10476-410 ELECT CAP 47 UF +-20% 10V

(ROHS) 1

X501 028-00455-011 CERAMIC FILTER ZTB455E

(MEC) (2 PINS) (ROHS) 1

041-02623-002 T262 HANDSET BATTERY

SPRING (+,-)(ROHS) 1

041-03531-002 N353 HANDSET BATTERY

PLATE (+)(ROHS) 1

041-03532-002 N353 HANDSET BATTERY

SPRING (-)(ROHS) 1

048-04020-006 Y3719 H/S CONTACT RUBBER

(FOR MEMOREX) (D.BL.287C /

GY.424C) W/WHITE SK.

(ROHS)

Ref. No Parts No. Description QTY

103-03535-0320 Y3719 H/S TOP CAB. (BLACK)

(31 KEY); ROHS "MEMOREX"

W/L.BU.285C/ WH./L.GY.429C

SK.

104-03530-010 M352M HANDSET BOTTOM

CABINET (BLACK) (ROHS) 1

111-03530-010 M352M HANDSET BATTERY

DOOR (BLACK);ROHS 1

137-11510-270 SPONGE 15 X 10 X 27 (W/ONE

SIDE TAPE) (ROHS) 1

144-12006-201 SCREW 2X6 BT (ROHS) 1

MI-Y3419-001 Y3419 (MI) CHASSIS ASSY 1

MI-34190-100 Y3419 (MI) MAIN BOARD

CHASSIS ASSY 1

ZD1 002-00033-640 IC KA33V (FAIRCHILD) TO-92

(MI) VOLTAGE STABILIZER;

ROHS

U205 002-01517-241 IC TDA1517P (DIP 18 PINS)

(PHILIPS);ROHS 1

R201 005-70120-111 METAL FILM RESISTOR 12

OHM +-1% 1W(ROHS) 1

C109 007-00102-301 MYLAR CAP 0.001 UF +-10%

100V ** (ROHS) 1

C105,106 007-00104-301 MYLAR CAP 0.1 UF +-10%

100V(ROHS) 2

C104,269,301,303,305,307

346,348 009-10105-450 ELECT CAP 1 UF +-20% 50V

(ROHS) 8

C230,233,238,247,248 009-10106-416 ELECT CAP 10 UF +-20% 16V

(ROHS) 5

C234,244,321,325,849 009-10107-416 ELECT CAP 100 UF +-20% 16V

(ROHS) 5

C265,266,308 009-10108-410 ELECT CAP 1000 UF +-20% 10V

(ROHS) 3

C271,272 009-10226-416 ELECT CAP 22 UF +-20% 16V

(ROHS) 2

C262,264,270,309,311,316

318,323,329,333,335,339,

340,342

009-10227-416 ELECT CAP 220 UF +-20% 16V

(ROHS) 14

C207,222,232,236,239,240 009-10475-450 ELECT CAP 4.7 UF +-20% 50V

(ROHS) 6

PARTS LIST

Ref. No Parts No. Description QTY

C103,111,118,124,126,128

201,202,327,331, 509,514,

515,521,523,525,527,529,

533,534, 544,841,842,848

009-10476-416 ELECT CAP 47 UF +-20% 16V

(ROHS) 24

L102 015-00102-007 AXIAL INDUCTOR 1000 UH;+-

10%;DCR:31.3OHM 0.08 MAX;

(CEC:A61027005)(ROHS)

L301A 015-00181-002 TOROID COIL 180 UH (RIA6-

875426) (COILS) (ROHS) 1

L301,302 015-00330-009 CHOKE COILS 33 UH;+-10%

(RADIAL TYPE) RDC:45 OHM;

4.0A MAX; (CEC:A61027007);

ROHS

L101 015-00681-001 AXIAL INDUCTOR 680 UH +-

10%;DCR:25.2 OHM 0.1A MAX

(CEC:A61027004)(ROHS)

JK4 021-23503-102 STEREO JACK 3.5MM 3 PINS

CKX3-3.5-20A GREEN

(ALRIGHT)(ROHS)

JK301 021-32103-100 DC JACK 3 PINS DC*02

(ALRIGHT)(ROHS) (CENTER

PIN DIA.=2.1MM)

CN54 025-20004-205 4P WAFER V-TYPE (2.5MM

PITCH) JST (ROHS) 1

CN72 025-20006-201 6P WAFER V-TYPE (2MM

PITCH) JST (ROHS) 1

CN57 025-20030-402 30P(15*2) DUAL ROW S-TYPE

(2.0MM PITCH) W/GOLG

PLATED (ROHS)

SAW1 028-A4575-001 SAW FILTER N45.75 (VAST)

(SIP TYPE) 45.75MHZ (ROHS) 1

JK3 046-20200-065 2P RCA JACK RCA*237V-050

(ALRIGHT) (RED/WHITE) PCB-

TYPE (ROHS)

JK81 046-20300-049 Y3419 3P RCA JACK

RCA*316V-030 (R/W/Y) PCB-

TYPE (ALRIGHT) (ROHS)

JK82 046-50100-010 S.VIEDO SOCKET DSW*04 (1P)

(ALRIGHT) (ROHS) 1

JK85 046-81500-001 Y3019 VGA SOCKET DP-001 1

Ref. No Parts No. Description QTY

(ALRIGHT)(ROHS)

JK86 046-20300-051 3P RCA JACK RCA*316V-090

(G/B/R) PCB-TYPE (ALRIGHT)

(ROHS)

X201 052-00503-100 CERAMIC RESONATOR:

503KHZ ZTB503F58;2 PIN 20

OHM;500PF;(MOBICON)

(ROHS)

X101 052-04000-002 CRYSTAL:4 MHZ HC49S (2

PIN) (MEC) +-30 PP

FUNDAMENTAL; ROHS

X501 052-19660-001 CRYSTAL:19.6608MHZ HC-

49U/S (2 PIN) +-20PPM; 20PF;

FUNDAMENTAL; (VAST)

(ROHS)

T101 061-56258-001 TV TUNER ENV56M25D8F

(PANASONIC)(ROHS)

(ATSC/NTSC/QAM TUNER)

(ET-55DHR)

148-31191-250 Y3119 U47 HEAT SINK BGA-IC

(ALUMINIUM) (28*28*20)MM

(ROHS)

MI-34190-700 Y3419 (MI) KEY BOARD

CHASSIS ASSY 1

CN700 025-20003-203 3P WAFER V-TYPE (2MM

PITCH) JST (ROHS) 1

MI-34190-900 Y3419 (MI) JACK BOARD

CHASSIS ASSY 1

C700 009-10476-416 ELECT CAP 47 UF +-20% 16V

(ROHS) 1

D700 019-10000-001 BI-COLOR LED LAMP (WHITE

DIFFUSED);ROHS L-3WEGW

"KINGBRIGHT"RED

EFFICIENCY/GREEN

JK700 021-23609-103 STEREO JACK 3.6MM 9 PINS

CKX*3.5-02AC(ALRIGHT)

(ROHS)

CN705 025-20003-203 3P WAFER V-TYPE (2MM

PITCH) JST (ROHS) 1

CN703 025-20004-202 4P WAFER V-TYPE (2MM

PITCH) JST (ROHS) (B4B-PH-K- 1

PARTS LIST

Ref. No Parts No. Description QTY

CN701 025-20005-201 5P WAFER V-TYPE (2MM

PITCH) JST (ROHS) 1

N700 061-06038-001 INFRARED REMOTE

DETECTOR FM-6038LM(ROHS) 1

FOR N700 136-20830-080 RUBBER 8*8*3MM (W/TWO

SIDE TAPE);ROHS 1

MI-34190-910 Y3419 (MI) ATSC BOARD

CHASSIS ASSY 1

CN6 025-20004-202

4P WAFER V-TYPE (2MM PITCH)

JST (ROHS) (B4B-PH-K-S) 1

CN3,4 025-20006-201 6P WAFER V-TYPE (2MM

PITCH) JST (ROHS) 2

CN5 025-20010-202 10P WAFER V-TYPE (2MM

PITCH) JST (ROHS) 1

X2 052-25000-004 CRYSTAL:25MHZ;16PF;+-30

PPM HC49S (MOBICON)(ROHS) 1

SMT-Y3419-

001 Y3419 (SMT) CHASSIS ASSY 1

SMT-34190-

100 Y3419 (SMT) MAIN BOARD

CHASSIS ASSY 1

001-34190-100 Y3419 MAIN P.C.B. (FR4) 2

LAYER (246*115*1.6)MM

(ROHS)

U204 002-00009-140 IC BA09FP (ROHM) TO-252

(SMT) (ROHS) 9V 1A VOLTAGE

TYPE 3-PIN REGULATOR IC

U306 002-01117-001-

190 IC LD1117L18TN3-A-R (UTC)

TO-252 (SMT) 1.8V,0.8A

VOLTAGE REGULATOR IC

(ROHS)

U304,305 002-01117-003-

190 IC LD1117L33TN3-A-R (UTC)

TO-252 (SMT) 3.3V 0.8A

VOLTAGE REGULATOR IC

(ROHS)

U504 002-02402-452 IC AT24C02BN-10SU-1.8 (SO-8)

(ATMEL) (EEPROM)(ROHS) 1

U502 002-02432-451 IC AT24C32AN-10SI-1.8

(ATMEL) SOIC-8 SMT 32K

(4096*8) EEPROM IC (ROHS)

U102 002-04053-070 IC 74HC4053 SOP16 (200MIL) 1

Ref. No Parts No. Description QTY

U301,307 002-02596-001-

164 IC N2596S-5 (NIKO-SEM) TO-

263 SMT (ROHS) 150KHZ 3A

STEP-DOWN VOLTAGE

REGULATOR IC

U803 002-04558-001-

150 IC D4558 (CHMC) SOP-8 (SMT)

OP-AMP IC (ROHS) 1

U802 002-07404-240 IC 74LVC04 APW (PHILIPS)

TSSOP-14 (SMT) (1001U30);

ROHS

U501 002-08125-001-

236 IC FLI8125 (GENESIS) PQFP-

208 (SMT) MIXED SIGNAL IC

(ROHS)

U202 002-09850-240 IC TDA9850T (PHILIPS) SO32

(SMT) BTSC STEREO/SAP

DECODER IC (ROHS)

U101 002-09885-240 IC TDA9885TS (PHILIPS)

SSOP24 (SMT) IF-PLL

DEMODULATORS IC (ROHS)

U201 002-21590-001-

195 IC R2S15900SP (RENESAS)

SOP-28 SMT AUDIO SIGNAL

PROCESSOR IC (ROHS)

U505 002-29040-003-

118 IC A29L040L-70F (AMIC) PLCC-

32 (SMT) 4M FLASH

MEMOREY IC (ROHS)

U203 002-74405-242 IC 74HC4052D (PHILIPS) SO-16

(SMT)(ROHS) DUAL 4-CH.

ANALOG MULTI.,

DEMULTIPLEXER IC

U302,303 003-20085-140 CHIP TRANSISTOR SP8J5

(ROHM) SO8 (SMT) P-

CHANNEL MOSFET IC (ROHS)

Q102,201,204,205,301,302

303,304,305,306,501,502,

802,900

003-23904-001-

114 CHIP TRANSISTOR NPN

FMMT3904 (HSMC) (ROHS) 14

Q202,203 003-23906-001-

114 CHIP TRANSISTOR PNP

FMMT3906 (HSMC) (ROHS) 2

Q101 003-25551-640 CHIP TRANSISTOR NPN

2N5551 (FAIRCHILD) SOT-23

(SMT);ROHS

Q103,104 003-27002-100 CHIP TRANSISTOR 2N7002LT1 2

PARTS LIST

Ref. No Parts No. Description QTY

SOT-23 (MOTOROLA)(ROHS)

ZD3,4,5,6,7,8,9,10,11,12,

15,16,17 004-80039-212-

001 ZENER DIODE TCLLZ39V

(TAK CHEONG) (SMT) 3.9V

0.5W (ROHS)

ZD2,13,14,18,19 004-80051-212-

001 ZENER DIODE TCLLZ51V

(TAK CHEONG) (SMT) 5.1V

0.5W (ROHS)

D301,303 004-80051-401 SW.DIODES RB051L-40

(ROHM) SMT (ROHS) 2

D302 004-80054-401 CHIP SCHOTTKY BARRIER

DOUBLE DIODES BAT54S

SOT23 (PHILIPS):ROHS

D501 004-80701-400 SW.DIODE BAV70LT1 (ON

SEMICONDUCTOR) SMT

(ROHS)

U503 004-81015-610 DUAL CHANNEL ESD

PROTECTION DIODE (SMT)

AZ1015-04S (ANGUS) SOT23-6L

(ROHS)

D306,307 004-84001-300 CHIP RECTIFIER SM4001

(ROHS) 2

D102,201,202,203,304,802 004-84148-400 SW. DIODE LL4148 (GOOD

EXCEL) SMT (ROHS) 6

R7,8,9,10,101,103,306,307

308,324,325,326,513,518,

805,846,847,848,127C,

C558,820,823,828,

FB11,13,14,21,22,25,37,

D101

005-52000-301 CHIP RESISTOR 0 OHM +-5%

(1608) (ROHS) 31

R109,110,123,127,205,206

219,220,535,536,806,807,

812,813,816,817,828,829,

835,836

005-52101-301 CHIP RESISTOR 100 OHM +-

5% (1608)(ROHS) 20

R209,210,213,531,532,533

534,900 005-52102-301 CHIP RESISTOR 1 K +-5%

(1608) (ROHS) 8

R204,231,233,234,239,317

318,319,320,508,509,515,

520,523,524,525,526,527,

528,543, 818,819,883,884

005-52103-301 CHIP RESISTOR 10 K +-5%

(1608) (ROHS) 24

R106,113,225,226,315,544 005-52104-301 CHIP RESISTOR 100 K +-5%

(1608) (ROHS) 6

Ref. No Parts No. Description QTY

R128,814,815,837,838 005-52123-301 CHIP RESISTOR 12 K +-5%

(1608) (MCR03EZHJ123)

(ROHS)

R218 005-52151-301 CHIP RESISTOR 150 OHM +-5%

(1608) (ROHS) 1

R881,882 005-52152-301 CHIP RESISTOR 1.5K +-5%

(1608) (MCR03EZHJ152)

(ROHS)

R230 005-52153-301 CHIP RESISTOR 15 K +-5%

(1608) (ROHS) 1

R211 005-52154-301 CHIP RESISTOR 150 K +-5%

(1608) (ROHS) 1

R212 005-52183-301 CHIP RESISTOR 18 K +-5%

(1608) (ROHS) 1

R820,821,822,859,861 005-52200-301 CHIP RESISTOR 20 OHM +-5%

(1608) (ROHS) 5

R557,558,559,708,709,710

712,811,826,827,830,831 005-52220-301 CHIP RESISTOR 22 OHM +-5%

(1608) (ROHS) 12

R114 005-52221-301 CHIP RESISTOR 220 OHM +-5%

(1608) (MCR03EZHJ221)

(ROHS)

R221,302,310,514,888 005-52222-301 CHIP RESISTOR 2.2 K +-5%

(1608) (ROHS) 5

R118,236,243,305,311,312

510,511 005-52223-301 CHIP RESISTOR 22 K +-5%

(1608) (ROHS) 8

R121,122,521,522,529,530

889 005-52272-301 CHIP RESISTOR 2.7 K +-5%

(1608) (MCR03EZHJ272)

(ROHS)

R117,203,207 005-52331-301 CHIP RESISTOR 330 OHM +-5%

(1608) (ROHS) 3

R237 005-52333-301 CHIP RESISTOR 33 K +-5%

(1608) (ROHS) 1

R214 005-52390-301 CHIP RESISTOR 39 OHM +-5%

(1608) (ROHS) 1

R104,105 005-52471-301 CHIP RESISTOR 470 OHM +-5%

(1608) (ROHS) 2

R119,120,125,223,224,

229,235,303,309,313,537,

538,539,541,542,562,563,

901

005-52472-301 CHIP RESISTOR 4.7 K +-5%

(1608) (ROHS) 18

PARTS LIST

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