BenQ Q74A Service Manual

Q74A

Service Manual

Q74A Service Manual

-2-

Contents

PRECAUTIONS................................................................................................. 4

ITEMS ............................................................................................................ 6

HOW TO CONNECT THE SEVERAL CABLES TO THE LCD MONITOR.......................... 7

▶ Setting up the LCD monitor ..................................................................... 7

ADJUSTING THE MONITOR............................................................... ................. 8

Q74A SPECIRICATIONS............................................................... ....................... 9

▶ Q74A Specifications .................................................................................. 9

DISPLAY MODES............................................................... ............................. 10

PowerSaver..................................................................................................... 10

OSD MENU............................................................... ..................................... 11

▶ Menu Tree............................................................................................ 11

FACTORY SET ................................................................................................ 12

BURN-IN MODE ............................................................................................. 12

INVERTER & POWER ...................................................................................... 13

▶ Inverter & POWER(Q74A)........................................................................ 13

▶ Specification ......................................................................................... 13

▶ Electrical Characteristics ........................................................................... 13

▶ Pin Connection ...................................................................................... 14

TROUBLESHOOTING ...................................................................................... 15

▶ No operating at all................................................................................... 15

▶ Doesn’t display on LCD............................................................................ 16

EXPLODE VIEW ............................................................................................. 18

▶

Q74A.................................................................................................. 18

PART LIST ..................................................................................................... 19

▶ Q74A Mechanical Part List........................................................................ 19

▶ Q74A AD B/D Part List ............................................................................ 20

▶ Q74A FUNCTION KEY B/D Part List........................................................... 23

▶ Q74A FUNCTION LED B/D Part List........................................................... 23

▶ Inverter & POWER BD Part List(FLF1742-20A).............................................. 24

▶ Inverter & POWER BD Part List(FLF1742-20A).............................................. 25

CIRCUIT DIAGRAM ........................................................................................ 26

▶ AD B/D(Q74A)...................................................................................... 26

▶ Inverter & POWER B/D(FLF1742-20A) ........................................................ 31

PCB Layout .................................................................................................... 34

▶ AD B/D TOP SILK (Q74 A) ....................................................................... 34

Q74A Service Manual

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▶ AD B/D TOP PATTERN (Q74A) ................................................................. 35

▶ AD B/D BOTTOM SILK (Q74A)................................................................36

▶ AD B/D MASK TOP (Q74A) ..................................................................... 37

▶ AD B/D MASK BOTTOM (Q74A) .............................................................. 38

▶ FUNC B/D TOP SILK (Q74A).................................................................... 39

▶ FUNC KEY B/D BOTTOM PATTERN (Q74A)................................................ 39

▶ FUNC LED B/D TOP SILK (Q74A) ............................................................. 39

▶ FUNC LED B/D BOTTOM PATTERN (Q74A)................................................ 39

Q74A Service Manual

-4-

Q74A

PRECAUTIONS

Warning : The following information will help you avoid the risk of electric shock,
serious injury, and death.

z Plug the power cord into a properly grounded outlet.

There is the risk of electric shock.
z If you hear a noise or smell smoke from the computer or adaptor, unplug the power cord

immediately, and call the service center.

There is the risk of electric shock or fire.
z Do not overload an electrical outlet with too many devices.

There is the risk of fire.
z Do not unplug from the outlet by pulling the power cord or when your hands are wet.

There is the risk of electric shock or fire.
z Do not bend the power cord excessively or place heavy objects on it. Keep children and pets

away from the power cord as they may damage the power cord. There is the risk of electric

shock or fire.
z Do not use a damaged power cord or plug. Make sure the plug fits snugly into the outlet.

There is the risk of electric shock or fire.

z Do not expose the monitor to the direct sun light.
z Do not block the fan louvers.

There is the risk of fire or damage to the monitor.
z Do not attempt to disassemble, fix, or modify the monitor.

There is the risk of electric shock or fire.
z Keep the monitor away from high temperature, humidity, and dust.

Operating environment = 0 ~ 40 Degrees Celsius

Operating environment = 30 ~ 80 Relative Humidity
z Do not allow any object or liquid to enter inside the monitor.

There is the risk of electric shock, fire, or damage to the monitor.

Q74A Service Manual

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Caution : The following information will help you avoid the risk of minor ofr moderate
injury,or damage to the monitor.

z Use a proper voltage/current level indicated.
z Do not clean the LCD with abrasive chemicals.

There is the risk of damage to the LCD.

z Do not scratch and damage the LCD with sharp objects.
z Keep the monitor away from objects and electrical appliances that may generate

electromagnetic fields.
z Place the monitor on a flat, stable surface.

The monitor may fall and there is the risk of damage or injury.
z Unplug the power cord when the monitor is not in use for a prolonged period of time.

Instruction for Cleaning the Monitor

z Make sure the power cord is unplugged.
z Do not spill or pour liquid on the monitor.

z Cleaning the LCD panel

1. Use a clean, soft cloth to wipe off dust from the LCD.

2. If still not clean, wipe the LCD with a clean soft cloth with a small amount of glass cleaner
without alcohol or ammonia.

z Caution
Do not use alcohol or ammonia based cleaning products. Abrasive chemicals, such as alcohol or
ammonia, may damage the monitor. The company is not responsible for the damages to the monitor
caused by the use of alcohol or ammonia based cleaning products.

Q74A Service Manual

ITEMS

◈ LCD Monitor

◈ Stand

◈ Power Cord

◈ 15pin D-Sub Cable

◈ User Manual

◈ 24pin DVI Cable *1

◈ Audio Cable *2

*1 : For DVI Model Only. *2 : For Audio Model Only.

Notice

Please make sure the following items are included with your monitor.

If any items are missing, contact your dealer. .

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Q74A Service Manual

HOW TO CONNECT THE SEVERAL CABLES TO THE LCD
MONITOR

▶ Setting up the LCD monitor

No. Name Cable connections

1 Power Power Cord

2 PC 15-pin D-Sub Signal Cable

3 DVI DVI-D Cable *1

4 SPK IN Audio Cable *2

5 SPK OUT External Speaker Cable *2

*1 : For DVI Model Only

*2 : For Audio Model Only

-7-

Q74A Service Manual

ADJUSTING THE MONITOR

The Function Control Buttons

How to use the Function Key

Menu Key:

1. First click : The OSD main menu appears.

2. Second click : The OSD main menu disappears.

Select Key : Select a command function.

Down Key :

1. Move the on-screen highlighted comand

item to the next one.

2. Decrease the current option value.

Mute Key : *2

Sound MUTE ON/OFF Button.

Up Key :

1. Move the on-screen highlighted comand

item to the previous one.

2. Increase the current option value.

Auto Key : *1

This will optimize image quality automatically.

MWE Key : You can manually adjust the screen to your

environment on the computer.

ex.) Internet, Games, Movies ...

*1 : For Analog Mode Only , *2 : For Audio Model Only.

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Q74A Service Manual

Q74A SPECIRICATIONS

▶ Q74A Specifications

MODE Analog Digital

Type TFT active matrix

17 inch

Size

337.92 X 270.336 (mm)

Pixel Pitch 0.264 X 0.264 (mm)

Panel

Display Color 8-bit (16,777,216 colors)

Basic 1280x1024@60Hz Display

Resolution

Maximum 1280x1024@75Hz 1280x1024@60Hz

Horizontal 31.5 ~ 80KHz 31 ~64KHz

Frequency

vertical 56 ~ 75Hz 59 ~ 61Hz

15 pin D-Sub 24pin DVI-D

Connectors

Speaker Input/Headphone Output(Audio Cable) *1

Tilting Degree (U/D) -5° ~ 20° Degree

Plug&Play VESA DDC 1/2B

Input Internal type : 100~240V AC,50/60Hz, 0.5A

Consumption Under 40W (Speaker Max 4W *1)

Power

Standby mode 1W less

Power Management PowerSaver

Temperature 0~25℃ (32℉~77℉) Environmental

Consideration

Humidity 90% less

Dimensions Outside 387mm * 185mm * 396mm (W*D*H)

Weight 3.9kg

*1 : For Audio Model Only

Notice

This monitor can be installed on any Plug & Play compatible system.

Interaction of the monitor and computer systems will provide the best

operating conditions and monitor settings. In most cases, monitor

installation will proceed automatically, unless the user wishes to select

alternate settings.

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Q74A Service Manual

-10-

DISPLAY MODES

Mode Resolution

Horizontal

Frequency(KHz)

Vertical

Frequency(Hz)

Pixel Clock

(MHz)

Sync

Polarity(H/V)

720 X 400 31.468 70.087 28.322 -/+

31.468 59.940 25.175 -/-

35.000 66.670 30.240 -/-

VGA

640 X 480

37.500 75.000 31.500 -/-

37.879 60.300 40.000 +/+

48.077 72.188 50.000 +/+

SVGA 800 X 600

46.875 75.000 49.500 +/+

48.363 60.004 65.000 -/-

56.476 70.000 75.000 -/-

XGA 1024 X 768

60.023 75.029 78.750 +/+

63.981 60.020 108.000 +,-/+,-

SXGA 1280 X 1024

79.976 *1 75.025 *1 135.000 *1 +/+ *1

*1 : For Analog Mode Only.

PowerSaver

State

Power

Consumption

Recovery

Time

LED Color

ON Under 40W - Green

OFF Less than 1W Within 2 Sec Amber

Q74A Service Manual

-11-

OSD MENU

▶ Menu Tree

Main Menu Sub Menu Function Description

BRIGHTNESS Control of brightness
CONTRAST Control of contrast
H POSITION Control of horizontal position
V POSITION Control of vertical position
PHASE Control of phase
CLOCK Control of horizontal clock

PICTURE

AUTO ADJUST Automatic adjust position
BLUISH Color Temperature 9300k
(some blue color)
REDISH Color Temperature 6500k
(some red color)
USER RED : 0 ~ 100
GREEN : 0 ~ 100
BLUE : 0 ~ 100

COLOR

AUTO COLOR Automatic adjust color
OSD H POSI Moves the OSD Menu
OSD V POSI Moves the OSD Menu
OSD TIMER OSD display time

OSD

TRANSPARENCY OSD Transparency
LANGUAGE Select OSD language
RECALL Factory default values
INPUT SELECT DVI, ANALOG Mode Change
AUDIO Sound Mute On/Off function. *1

MISC

VOLUME You can adjust the volume. *1

*1 : For Audio Model Only

Q74A Service Manual

-12-

FACTORY SET

OSD Menu => Misc => Recall => Yes. Every value changes factory setting value.

After factory set executes, power OFF Æ power ON automatically.
You must push the “AUTO” button because of optimum image quality automatically.

When user want factory setting value, you must execute this function.

BURN-IN MODE

If you push the down button more than 5 seconds in disconnected signa l cable status, you can see changed
color.

Burn-In mode displays chaged color continually. (white, red, blue, green etc.)

We can check normal operating status of the monitor under mass production.

If you want to finish Burn-In mode, you can turn off the power by only push the power button.

Q74A Service Manual

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INVERTER & POWER

▶ Inverter & POWER(Q74A)

z L.I.P.S : LCD INVERTER POWER SYSTEM(FLF1742-20A)

▶ Specification

z Operate 4 CCFL Lamps.
z Current Feedback Control
z Input Voltage : DC 12V.
z When any lamp doesn’t operate, the panel is under protection status.

Protection status means that circuit protect the other lamp.

z PWM Control.
z Remote Power On/Off control
z High Efficiency

▶ Electrical Characteristics

Description

Min Typ

Max Sign Remark
Input Voltage 11.0 12.0 13 .0 Vin
Input Current 1.5 1.7 1.9 A 12Vdc

Output Current 5.0 6.0 7.0 mArms 1ccfl current

Lamp Frequency 40 47 55 kHz

Normal Operation ON

Vin=12V

ON/OFF=5V

ON/OFF Control

Shunt-down(Lamp off) OFF

Vin=12V

ON/OFF=0V

Kick-Off

Voltage

MORE THAN 1100 Vrms Kick-Off

Q74A Service Manual

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▶ Pin Connection

- INPUT CONNECTOR CON1

Pin NO. Symbol Descripition

1,2 VIN 1 Input Voltage : 12V

3,4,7 GND GND

5,6 VIN 2 Inopt Voltage : 5V

8 ON/OFF Power System Return
9 NC NC

- OUTPUT CONNECTOR CN1,2,3,4
Pin NO. Symbol Descripition

1 HV1,2,3,4 HI VOLTAGE TERMINAL
2 LV1,2,3,4 LOV VOLTAGE TERMINAL

Q74A Service Manual

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TROUBLESHOOTING

▶ No operating at all

What you see Suggested Actions

Is the power inserted correctly? Insert the plug correctly referring to the User Manual.
Does the Power Adapter operate
correctly?

Check the Power Adapter.

The green LED is OK.
The Power Adapter operates correctly,
but the LCD Monitor does not operate
correctly.

Check the harness of the FUNC. B/D.

Does The Power On/Off and the LED
Operate corretly?

If the program of the MICOM is error, then exchange the

MICOM.

If the AD B/D is error, then exchange the AD B/D.
The Power On/Off and the LED operate
correctly, but the OSD menu doesn’t
display on screen.

First, operate the FACTORY SET.

Second, check the Panel Harness that is connected to the AD

B/D.

Check the LAMP Harness of the Panel.

Lastly, exchange the LIPS.
The OSD menu operates correctly but
the image doesn’t display on screen.

Insert the SIGNAL Cable correctly referring to the User

Manual.

Check the LAMP Harness of Panel and Inverter.

Lastly, Check the LAMP of Panel.
The Power On/Off operates correctly,
but the screen is ‘ALL WHITE’.

The LAMP is OK.

Check the Panel Harness that is connected to the AD B/D.
The Power On/Off operates correctly,
but the screen is ‘ALL BLACK’.

Check the LAMP Cable.

Check or exchange the LIPS.

Check the Panel Cable.

Q74A Service Manual

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▶ Doesn’t display on LCD

“VIDEO MODE NOT
SUPPORTED” message

[Windows]

Reboot safe mode. (press the F8 key during bootin g) .

Remove GraphicCard Driver.

Reboot normal mode.

Reinstall GraphicCard Driver.
“No signal” message Check the signal cable.

Check DPMS mode in PC.

Check pins of the signal cable.
If PC keeps DPMS status
Continually
(No signal Input,
LED color amber)

Check the signal cable.

Check pins of the signal cable.

Check HS_VGA and VS_VGA in schematics.

Doesn’t display on screen
Correctly include OSD menu

Check scaler output signal.

Check panel harness between panel and AD B/D.

Check solder status of the scaler.
Doesn’t display on screen
Correctly except OSD menu

Check the signal cable.

Check scaler input signal (RGB,H-SYNC,V-SYNC)
Noise in vertical pattern. Execute Auto Adjust.

According to graphic card.

Check 60Hz vertical frequency in display properties.
Display position error Execute Auto Adjust

Display position error occurred on dark or moving

picture.(like game)

In this case, you must execute Auto Config in windows

screen.

Q74A Service Manual

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Color error include OSD menu Check the panel harness.

Check scaler output signal.
Color error except OSD ment. Check the signal cable.

Check pins of the signal cable.

Check input/output signal of the signal cable
Key button error Check the function(key) harness.

Check the function ass’y (mechanical).
Brightness differ between upper and
lower on screen.

Because of viewing angle.

Q74A Service Manual

EXPLODE VIEW

▶ Q74A

-18-

Q74A Service Manual

PART LIST

▶ Q74A Mechanical Part List

-19-

Q74A Service Manual

-20-

▶ Q74A AD B/D Part List

Location

Parts Code

Parts Name Parts Spec. Remar

k

CE16

CEXF1C471A C ELECTRO

16V 470uF 20% 10x12.5 TAP

CE5,CE6,CE12,

CE13,CE14,

CE15

CEXF1C101A

C ELECTRO

16V 100uF 20% 6.3X11 TAP

CE7, CE8, CE9, CE10,

CE11

CEXF1C100A C ELECTRO 16V 10uF 20% 5x11 TAP

CON1 97E6200710 CONN WAFER 12507WR-30000 (30P LVDS)

C6, C7, C8, C10, C11,

C12, C18,C19,

C20, C21, C22, C23,

C24, C25, C26,

C27, C28, C29, C30,

C31, C34, C37,

C38, C39, C40, C41,

C42, C43, C44,

C45, C46, C47, C48, C49

HCCK104ZBA C CHIP CERA 50V 100nF Z 1608

C9 HCCH103KBA C CHIP CERA 25V 10nF K 1608

C13, C14, C15 HCCK200JBA C CHIP CERA 50V 20pF J 1608

HCCK330JBA C CHIP CERA 50V 33pF J 1608

C17 HCCK221JBA C CHIP CERA 50V 220pF J 1608

C35, C36 HCCK101JBA C CHIP CERA 50V 100pF J 1608

C32, C33 HCCK220JBA C CHIP CERA 50V 22pF J 1608

DZ1, DZ2, DZ3 ,DZ4,

DZ5, DZ6

DUDZS5.6B- ZENOR DIODE UDZS 5.6B(SOD-323), ROHS 적용품

DZ7 DZMM55C5V6 ZENER DIODE ZMM55C5V6

D2, D3, D4, D5,

D6, D7, D8,

D9, D10D11, D12, D13,

D14,D15, D16

DBAV99---- CHIP DIODE BAV99 (SOT-23)

FB4, FB5, FB7 HFA1608121 BEAD CHIP

CIM10J121NC(BEAD_120

ohm_1608)

FB3, FB6, R60 HRFS000JBA R CHIP 1/16W 0 ohm J 1608

Q74A Service Manual

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FB8 HFA3216121 BEAD CHIP CIM31J121NE (BEAD_120ohm_3216)

J4 97E6200110 15-PIN D-SUB HDR10-15F-RL

J5 97E6200734 CONN WAFER

IBP-07R-20T(GIL-S-7P-S2L2-EF) :

Right angle

J6 97E6200790 DVI_29PIN 361R02-0

J7 99E6203095 CONN WAFER IBP-09S-20T(GIL-S-9P-S2T2-EF) :

Q4, Q5 TSBT3904-B TR CHIP SBT3904

Q2, Q3 TSBT3906-B TR CHIP SBT3906

R21, R24, R26, R41, R42,

R43, R52, R53, R64, R65

HRFS103JBA R CHIP 1/16W 10K J 1608

R20 HRFS222JBA R CHIP 1/16W 2.2K J 1608

R27, R28, R45, R46, R50,

R54, R55, R57, R58, R59,

R61, R66, R100, R101

HRFS472JBA R CHIP 1/16W 4.7K J 1608

R7, R8, R9, R10, R11,

R12, R13, R14

R15, R16, R22, R51

HRFS101JBA R CHIP 1/16W 100 ohm J 1608

R17, R18, R19 HRFS750JBA R CHIP 1/16W 75 ohm J 1608

R23, R25 HRFS201JBA R CHIP 1/16W 200 ohm J 1608

R29, R30, R31, R33, R35,

R36, R37R38, R39, R40

HRFS100JBA R CHIP 1/16W 10 ohm J 1608

R32, R34 HRFS220JBA R CHIP 1/16W 22 ohm J 1608

R44 HRFS821JBA R CHIP 1/16W 820 ohm J 1608

R47, R48, R67, R68 HRFS330JBA R CHIP 1/16W 33 ohm J 1608

R49 HRFS391JBA R CHIP 1/16W 390 ohm J 1608

R56 HRFS223JBA R CHIP 1/16W 22K J 1608

R62 HRFS104JBA R CHIP 1/16W 100K J 1608

R63 HRFS122JBA R CHIP 1/16W 1.2K J 1608

U2

1A111733DC

IC REGULATOR

APL1117-33UC-TR(TO-252)

U3 1AP1117E18 IC REGULATOR AP1117E18A, SOT223-3L

U4 1TSUM56AL- IC SCALER TSUM56AL-LF ( MSTAR )

U5 1AT24C02N- IC EEPROM AT24C02N-10SU-2.7 , LEAD FREE

U6 1FDC6329L- IC LOADSWITCH FDC6329L SUPERSOT TM-6 , ROHS

U7 1PS25LV512 IC FLASH MEMORY PS25LV512 ( MSTAR ) , 512KBIT ,

Q74A Service Manual

-22-

U8 1AT24C16--

IC EEPROM

(ATMEL)

AT24C16N-10SU-2.7(SOIC 8P),

ROHS 적용품

X1 5XJ14R318E CRYSTAL QUARTZ 14.3181MHz XTAL2 20pF DIP

CE1, CE4 CEXF1C471A

C ELECTRO 16V 470uF 20% 10x12.5 TAP

CE2, CE3 CEXF1C102A

C ELECTRO 16V 1000uF 20% 10x16 TAP

C1, C2 HCCK104ZBA C CHIP CERA

50V 100nF Z 1608

C5 HCCK105ZBA C CHIP CERA

50V 1uF Z 1608

C3, C4 HCCF474MBA C CHIP CERA

16V 470nF M 1608

C3, C4 HCCF474KBA C CHIP CERA

16V 470nF K 1608

D1 DZN4002---

DIODE 1N4002 100V 1A T-26

FB1, FB2 HFA1608121 BEAD CHIP

CIM10J121NC(BEAD_120

ohm_1608)

J1 97E6200600 CONN WAFER

53014-0410

J2, J3 97E6300220 STEREO JACK

ST-320 (5P 3.5pi)

Q1 TSBT3904-B TR CHIP

SBT3904

R4 HRFS472JBA R CHIP

1/16W 4.7K J 1608

R2 ,R3 HRFS103JBA R CHIP

1/16W 10K J 1608

R5, R6 HRFS303JBA R CHIP

1/16W 30K J 1608

R1 HRFS304JBA R CHIP

1/16W 300K J 1608

U1 1TDA7496L- IC AUDIO

TDA7496L(ST)

-Red Calor : DVI Part

-Blue Calor : AUDIO Part

Q74A Service Manual

-23-

▶ Q74A FUNCTION KEY B/D Part List

Location

Parts Code

Parts Name Parts Spec. A/J Remark

PCB 97E6500843-00 FUNCTION_PCB 1 LAYER(102.5*15mm) HL711S/D

J1 99E6203075 CONN WAFER IBP-07S-20T(GIL-S-7P-S2L2-EF)

J2 99E6203045 CONN WAFER IBP-04S-20T(GIL-S-4P-S2T2-EF)

R1,R2 HRFS152JBA R CHIP 1/6W 1.5K J 1608

R3 HRFS302JBA R CHIP 1/6W 3K J 1608

SW1,SW2,

SW3,SW4,

5S51280A6- TACT SWITCH 1280A6 (KNOB-5mm)

▶ Q74A FUNCTION LED B/D Part List

Location

Parts Code

Parts Name Parts Spec. A/J Remark

PCB 97E6500844-00 LED FUNCTION_PCB 2 LAYER(41.5*15mm) HL711S/D

J1 99E6203045 CONN WAFER IBP-04S-20T(GIL-S-4P-S2T2-EF)

LED DLSAM3270- LED LED 3pai 3PIN(2.54-PITCH)

SW5 5S51280A6- TACT SWITCH 1280A6 (KNOB-5mm)

Q74A Service Manual

▶ Inverter & POWER BD Part List(FLF1742-20A)

NO. Ref. PART TYPE 1st. Vendor 2nd. Vendor Q,ty

1 L F101 LFL 002A 동 흥 GET 1
2 PC 101 LT V -817B-M ,TC ET 1103 L IT ON Vi s ha y 1
3 BD101 KBP 206G TSC 1
4 D104,105 S B560 V IS HAY -GS DIODE S 2
5 D103 M BR10H150C T VI S HAY -GS 1
6 C105 CE 82u400V 85SD,SHL ,GS 삼영 ,삼 화 ,만 유 1
7 C103,104 KNB1560M KP-334K IS KRA PI L C O,선 일 2
8VS1 VARISTOR 7D471 ILJIN(AMOTECH) CNR 1

9 C101,102 DG102Y 1 두 산 , 동 일 2
10 C106 DG222Y 1 두 산 , 동 일 1
11 C2 CE 220U25V105L XZ ,WL,RT 삼 영 ,삼 화, 만 유 1
12 CN100 SC-8R-F152P 32R-GB S UPE RCOM 1
13 CN101 GI L -S-9P -S2T 2-EF LG전 선 1
14 IC 101 FS DM 0565R FA IRC HIL D 1
15 CN1,2,3,4 35002WR-02, JE 207-B1T-02 연 호 J AEE UN 4
16 T101 T RSL 014A 동흥 GE T 1
17 T3 TR S 1801U - DI P 경 인 ,링 보 다 폰 1
18 U1,2 AP4511GD-DIP APE C 2
19 U3 BIT3105 - DI P BI TE K 1
20 D101 RS 1J , UF4007 TSC S HS 1
21 Z D104 ZY 160 SHS 1
22 D2,4 DAN217,BAV 99 Roh m DI ODE S 2
23 D5 DAP 202U Rohm 1
24 Z D1,2,3 UDZ S5.6B,BZ T52C 5V 6S-7 Rohm DI ODE S 3
25 Z D102 UDZ S10B,BZ T52C 10V 0S Ro h m DI ODE S 1
26 Z D101,103 UDZ S20B,BZ T52C 20V 0S Ro h m DI ODE S 2
27 Q1 2N3904,M MBT 3904 Rohm DI O DES 1
28 C1,17 CC 106Z 10V 3216 삼성 ,T DK 태양유전 2
29 C8 CC 473K50V 2012 삼 성 ,TDK 태양유전 1
30 C13 C C271K50V 2012 삼 성,T DK 태양유전 1
31 C6,7,9,12,20 CC 103K50V 2012 삼 성 ,TDK 태양유전 5
32 C11,22,24,122 CC104K50V 2012 삼 성,TDK 태양유전 4
33 C3,4,14,19,119 C C105Z 16V2012 삼 성 ,TDK 태양유전 5
34 R116,117 C R 2012J200 삼 성 Roh m 2
35 R114,115 C R 2012J181 삼 성 Roh m 2
36 R28,29 C R 2012J221 삼 성 Roh m 2
37 R121 C R2012J122 삼 성 Rohm 1
38

R119,122

CR2012J 332 삼성 Roh m

2

39

R1,16,20,22,24

CR2012J 103 삼성 Roh m

5

40 R2,3,10 CR2012J 183 삼성 Roh m 3

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Q74A Service Manual

▶ Inverter & POWER BD Part List(FLF1742-20A)

NO. Ref. PART TYPE 1st. Vendor 2nd. Vendor Q,ty

41 R 12 C R2012J433

삼성 Rohm

1

42 R 26 C R2012J753

삼성 Rohm

1

43 R 11 C R2012J134

삼성 Rohm

1

44 R 5 C R2012J 154

삼성 Rohm

1

45 R 8,25 C R 2012J 224

삼성 Rohm

2

46 R 9 C R2012J 824

삼성 Rohm

1

47 R 27 C R2012J105

삼성 Rohm

1

48 R 15,19 C R2012F3600

삼성 Rohm

2

49 R 126 CR2012F1431

삼성 Rohm

1

50 R 123 CR2012F1801

삼성 Rohm

1

51 R 124 CR2012F2702

삼성 Rohm

1

52 R 101,102,103 C R 3216J 334

삼성 Rohm

3

53 R111 RD 1/ 4W J 3.9 O HM

제일전자 스마트전자

1

54 R105,106 RD 1/ 4W J 33K O HM

제일전자 스마트전자

2

55 C 112 221K 1KV

동일 두산

1

56 C 113 222K 1KV

동일 두산

1

57 C 115

CE 680u 25V105RD,KM 삼 영,삼 화,만 유

1

58 C 117,118

CE 1000u 10V105RD,KM 삼 영,삼 화,만 유

2

59 C 110

CE47U50V 85/CE47U50V 105

삼영,삼화,만유

1

60 I C 102

TL 431A Fai r C hi ld 우 석

1

61 BC 102

EBFL 001A 동 흥전 자 GE T

1

62 C 5,10

CL 100K3K 두 산전 자 동 일

2

63 D102

PR1003, FR104 Di ode s 성호 반도 체

1

64 T H101

SC K08053M S,NT C 5D-9 T h in ki n g 삼경 쎄라 믹

1

65 F101

SR-5 3.15A 세이브퓨즈

1

66 P .W.B FR-1 P L 1742C20 다산 동 명 1

-25-

Q74A Service Manual

-26-

CIRCUIT DIAGRAM

▶ AD B/D(Q74A)

Q74A Service Manual

-27-

Q74A Service Manual

-27-

Q74A Service Manual

-28-

+5V

BT13

1

+

CE11

10uF/16V

BKLT-EN

TP3

1

AVDD_PLL_3.3

+5V

+5V

Q5

SBT3904

3

1

2

R60

0

R26 10K

C32 22p

RXEC-

R24 10K

FLASH_MEMORY

J5

3

2

4

5

1

6

7

KEY1

KEY2

GND

LED_R

GND

LED_G

VCC

GIN

R55

4.7K

RXO3+

R62

100K

D8

BAV99

1

2

3

U8

AT24C16(SOIC)

1

2

3

4

5

6

7

8

A0A1A2

GND SD A

SCL

WP

VCC

BT7

1

AVDD_ADC_3.3

INV_ON

TP29

1

BT4

1

BT9

1

BT12

1

BT5

1

R52 10K

VDDC_1. 8

BT25

1

BT14

1

SDA_DVI

RXE1-

SOGIN

BT16

1

GND_POWER

RXO0-

+5V

BT10

1

R67 33

D7

BAV99

1

2

3

R27 4.7K

DET DVI

BT21

1

BT6

1

BT18

1

VDDP_3.3

TP5

1

RXO0-

R51

100

VDDC_1.8

C39

0.1uF

ST_DET

PANEL_INTERFACE

DSDA

RIN

RXE3+

R25 200

+5V

KEY_INTERFACE

RX1+

R57 4.7K

RXO2-

R68 33

RXEC+ RXE3-

BT20

1

R50

4.7K

TP30

1

MUTE

RINM

VDDP_3.3

R54

4.7K

RXEC-

RXE3-

BT3

1

R59 4.7K

BT22

1

BT8

1

C33 22p

AVDD_MPLL_3.3

RXO1+

BT23

1

RXE0-

R41 10K

R32 22

RXE0+

RXOC+

C41

0.1uF

INV_ON

R64 10K

TP28

1

RXOC-

R100 4. 7K

Q2

SBT3906

2

1

3

ON_Pannel

R42 10K

RXO2+

Q4

SBT3904

BKLT-VBRI

ON_Pannel

RXE0+

CON1

12507WR-30

1234567891011121314151617181920212223242526272829

30

31

32

VDDP_3.3

EEPROM

BIN

RXE3+

RXE0-

BT2

1

RXE2-

RXO2+

R49 390

RX2-

RX2+

+

CE14

100uF/16V

AVDD_DVI_3.3

RXO2-

R28 4.7K

0

SCALER & PANEL

HL720D

Title

Document N um ber Rev

Sheet

of

DESIGN CHEC K APPROVAL

WooYoung Telecom Co., Lt d.

Model

RXC-

C38 0.1uF

SCL_DVI

BT19

1

GINM

R23 200

RXO0+

RXE2-

BT15

1

R53 10K

C44

0.1uF

RXC+

RXO3-

+5V

DSCL

RXEC+

C42

0.1uF

C43

0.1uF

RX0-

RXO1-

RXE2+

R61 4.7K

RXE1+

R34 22

RXO3-

RXO1-

+

CE15

100uF/16V

X1

14.318MHZ

BT1

1

C480.1uF

Q3

SBT3906

2

1

3

DIM_ADJ

U6

FDC6329L

4

5

6

3

2

1

YTN

On-Off

R1_C1

V_Out2

V_Out1

R2

RXE2+

BT26

1

DIM_ADJ

C49

0.1uF

RXOC+

PS25LV512(SOI C)

U7

1

2

3

4

5

6

7

8

CS

SO

WP

GND SI

SCK

HOLD

VCC

BT27

1

C40

0.1uF

RXO3+

RXO0+

R58 4.7K

HSYNC

RX1-

R65 10K

R66

4.7K

SCALER

&

PANEL

TP4

1

+5V

TP31

1

VOLUM

RXOC-

VSYNC

E

R101 4.7K

DVI_INPUT

RXE1+

C37 0.1uF

BT24

1

RX0+

RXO1+

RXE1-

C45

0.1uF

R63

1.2K

VDDP_3.3

R56223

U4

TSUM56AL-LF

33

32

30

29

18

35

34

19

31

41

42

40

16

17

80

81

78

79

55

61

72

82

94

56

62

73

83

95

58

64

85

57

63

84

47

28

27

2

14

11

8

5

25

26

23

24

22

20

21

1

48

49

50

51

52

53

54

15

43

37

36

38

39

76

77

70

71

74

75

96

97

92

93

90

91

86

87

88

89

44

45

46

66

69

3

4

6

7

10

12

13

59

60

65

67

68

100

99

98

9

GND
VDDP

DDCA_SDA

GND

BIN0P

GPIO_P15/PWM0
VDDC

GIN0M

DDCA_SCL

GPIO_P23

GPIO_P22

SDI

AVDD_PLL

BIN0M

BYPASS

VCTRL

LVB0M

GND

LVA3M

LVA2M

LVB2M

VDDC

GPIO_P13

VDDP

LVA1P

LVB1P

GND

GPIO_P14

LVACKP

LVA0P

GPIO_P12

GND

LVA1M

RSTGPIO_P24/PWM2

VSYNC0

HSYNC0

GND

AVDD_DVI

GND

AVDD_DVI

GND

REFM

REFP

RIN0P

AVDD_ADC

RIN0M

GIN0P

SOGIN0

DDCD_SCL

GPIO_P27/PWM1

VDDP

GND

VDDC

MODE[ 0]

MODE[ 1]

LVA3P

REXT

GP IO_P11/I2C_MDA

SDO
NC

CSZ

SCK

GND

LVB0P

LVBCKM

LVB2P

LVB1M

VDDP

XIN

XOUT

GPIO_P07

GPIO_P26/PWM0

GPIO_P02/SAR3

GPIO_P06

GPIO_P25/PWM1

RSTN

GPIO_P00/SAR1
GPIO_P01/SAR2

GP IO_P10/I2C_MCL

NC

NC

VDDC

LVBCKP

R+R-G+G-B-

CK+

CK-

LVACKM

LVA2P

LVA0M

LVB3P

LVB3M

DDCD_SDA

GPIO_P16/PWM2

AVDD_MPLL

B+

BT17

1

VDDP_3.3

BT11

1

C47

0.1uF

BINM

Q74A Service Manual

CE4

470uF/16V

FB1

BEAD_120ohm_1608

R5

30K

GND

C2

0.1uF

C4

470nF

FB2

BEAD_120ohm_1608

C3

470nF

R4

4.7K

VOLUME

AIN-R

TP1

1

CE3

1000uF/16V

+5V

AUDIO_PART

R1

300K

D1

1N4002/DIP

1

2

CE2

1000uF/16V

J1

12507WR-04A

1

2

3

4

LEFT

GND

GND

RIGHT

SPEAKER

WAFER

R3

10K

Q1

SBT3904

1

2

3

C5

1uF

AIN-R

CE1

470uF/16V

TP2

1

AIN-L

U1

TDA7496L

12

1

11

2

3

20

19

5

6

7

4

8

10

9

13

16

14

15

18

17

MUTE

G1

STBY

G2

G3

G20

G19

VAROUT-L

VOL

VAROUT-R

LIN

NC

SVR

RIN

P13

VCC

R_OUT

VCC

G18

L_OUT

+12V

MUTE

AIN-L

R2

10K

J2

ST-320

2

3

4

5

1

AUDIO

INPUT

J3

ST-320

2

3

4

5

1

R6

30K

C1

0.1uF

-29-

Q74A Service Manual

-30-

D11

BAV99

1

2

3

C35100pF

SDA-DVI

D9

BAV99

1

2

3

9

RX0-

+5V

C4

R31 10

R48 33

D12

BAV99

1

2

3

R46

4.7K

RX2-

D13

BAV99

1

2

3

D16

BAV99

1

2

3

C36100pF

D14

BAV99

1

2

3

DET_DVI

J6

DVI_30P

3

2

1

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

31

34

321456789

101112131415161718192021222324

C1C2C3C4C5

31

34

RX2-

R45

4.7K

RX1-

SDA_DVI

RX0+

U5

AT24C02(SOIC)

1

2

3

4

5

6

7

8

A0A1A2

VSSSDA

SCLWPVCC

DZ4

UDZS5.6B

1

2

8

R35 10

R44 820

24

RXC+

C1

RXC-

R29 10

RX0-

DVI(Digtial Visual I nterface) 29P

0

DVI INPUT

HL720D

Titl e

Document Number Rev

Sheet

of

DESIGN CHECK APPROVAL

WooYoung Telecom Co., Ltd.

Model

RX2+

RX0+

R47 33

DVI_INPUT

SCL_DVI

C34 0.1uF

RXC+

R37 10

E

E

P

_

R

O

M

+5V

RXC-

R40 10

RX1-

D10

BAV99

1

2

3

RX1+

DET_DVI

SCL-DVI

DZ5

UDZS5.6B

1

2

16

1

R43 10K

DZ6

UDZS5.6B

1

2

D15

BAV99

1

2

3

+5V

R33 10

C2

RX1+

R36 10

R39 10

RX2+

17

R30 10

C3

R38 10

Q74A Service Manual

-31-

LED_GREEN

R2

1.5K

J1

CON8

7

6

5

4

3

2

1

GND

5V

KEY2

LED_RED

SW4

STS-1102A-1

SW2

STS-1102A-1

GND

R3

3K

GND

GND

R carbon
film(T-52
Small)

R1

1.5K

J2

CON4

1

2

3

4

SW1

STS-1102A-1

KEY1

SW3

STS-1102A-1

LED_RED

LED1

SAM5270

3

2

1

LED_Green

SW5

STS-1102A-1

KEY1

GND

J3

CON4

4

3

2

1

Q74A Service Manual

▶ Inverter & POWER B/D(FLF1742-20A)

- Adapter Cutcuit

-32-

Q74A Service Manual

-Inverter Circuit

-33-

Q74A Service Manual

-34-

PCB Layout

▶ AD B/D TOP SILK (Q74A)

Q74A Service Manual

▶ AD B/D TOP PATTERN (Q74A)

-35-

Q74A Service Manual

▶ AD B/D BOTTOM SILK (Q74A)

-36-

Q74A Service Manual

▶ AD B/D MASK TOP (Q74A)

-37-

Q74A Service Manual

▶ AD B/D MASK BOTTOM (Q74A)

-38-

Q74A Service Manual

▶ FUNC B/D TOP SILK (Q74A)

▶ FUNC KEY B/D BOTTOM PATTERN (Q74A)

▶ FUNC LED B/D TOP SILK (Q74A)

▶ FUNC LED B/D BOTTOM PATTERN (Q74A)

-39-