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Q74A
Service Manual

Q74A Service Manual 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 (Q74A) ....................................................................... 34

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Q74A Service Manual
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

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Q74A Service Manual

Q74A
PRECAUTIONS
Warning : The following information will help you avoid the risk of electric shock, serious injury, and death. Plug the power cord into a properly grounded outlet. There is the risk of electric shock. 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. Do not overload an electrical outlet with too many devices. There is the risk of fire. 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. 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. 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. Do not expose the monitor to the direct sun light. Do not block the fan louvers. There is the risk of fire or damage to the monitor. Do not attempt to disassemble, fix, or modify the monitor. There is the risk of electric shock or fire. Keep the monitor away from high temperature, humidity, and dust. Operating environment = 0 ~ 40 Degrees Celsius Operating environment = 30 ~ 80 Relative Humidity 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.

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Q74A Service Manual
Caution : The following information will help you avoid the risk of minor ofr moderate injury,or damage to the monitor. Use a proper voltage/current level indicated. Do not clean the LCD with abrasive chemicals. There is the risk of damage to the LCD. Do not scratch and damage the LCD with sharp objects. Keep the monitor away from objects and electrical appliances that may generate electromagnetic fields. Place the monitor on a flat, stable surface. The monitor may fall and there is the risk of damage or injury. Unplug the power cord when the monitor is not in use for a prolonged period of time.

Instruction for Cleaning the Monitor
Make sure the power cord is unplugged. Do not spill or pour liquid on the monitor.

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.

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.

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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. 1 2 3 4 5 Name Power PC DVI SPK IN SPK OUT Cable connections Power Cord 15-pin D-Sub Signal Cable DVI-D Cable *1 Audio Cable *2 External Speaker Cable *2 *1 : For DVI Model Only *2 : For Audio Model Only

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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 Type Size Pixel Pitch Display Color Display Resolution Frequency vertical Connectors Tilting Degree (U/D) Plug&Play Input Power Consumption Standby mode Power Management Environmental Consideration Dimensions Weight Temperature Humidity Outside 56 ~ 75Hz 15 pin D-Sub 59 ~ 61Hz 24pin DVI-D Basic Maximum Horizontal Analog TFT active matrix 17 inch 337.92 X 270.336 (mm) 0.264 X 0.264 (mm) 8-bit (16,777,216 colors) [email protected] [email protected] 31.5 ~ 80KHz [email protected] 31 ~64KHz Digital

Panel

Speaker Input/Headphone Output(Audio Cable) *1 -5 ~ 20 Degree VESA DDC 1/2B Internal type : 100~240V AC,50/60Hz, 0.5A Under 40W (Speaker Max 4W *1) 1W less PowerSaver 0~25 (32~77) 90% less 387mm * 185mm * 396mm (W*D*H) 3.9kg *1 : For Audio Model Only

This monitor can be installed on any Plug & Play compatible system. Interaction of the monitor and computer systems will provide the best Notice 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

DISPLAY MODES
Horizontal Mode Resolution Frequency(KHz) Frequency(Hz) (MHz) Polarity(H/V) Vertical Pixel Clock Sync

720 X 400 VGA

31.468 31.468

70.087 59.940 66.670 75.000 60.300 72.188 75.000 60.004 70.000 75.029 60.020 75.025 *1

28.322 25.175 30.240 31.500 40.000 50.000 49.500 65.000 75.000 78.750 108.000 135.000 *1

-/+ -/-/-/+/+ +/+ +/+ -/-/+/+ +,-/+,+/+ *1

640 X 480

35.000 37.500 37.879

SVGA

800 X 600

48.077 46.875 48.363

XGA

1024 X 768

56.476 60.023

SXGA

1280 X 1024

63.981 79.976 *1

*1 : For Analog Mode Only.

PowerSaver
Power Consumption Under 40W Less than 1W Recovery Time Within 2 Sec

State

LED Color

ON OFF

Green Amber

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Q74A Service Manual

OSD MENU
Menu Tree
Main Menu PICTURE Sub Menu BRIGHTNESS CONTRAST H POSITION V POSITION PHASE CLOCK AUTO ADJUST COLOR BLUISH Function Description Control of brightness Control of contrast Control of horizontal position Control of vertical position Control of phase Control of horizontal clock Automatic adjust position Color Temperature 9300k (some blue color) REDISH Color Temperature 6500k (some red color) USER RED : 0 ~ 100 GREEN : 0 ~ 100

BLUE : 0 ~ 100 AUTO COLOR OSD OSD H POSI OSD V POSI OSD TIMER TRANSPARENCY MISC LANGUAGE RECALL INPUT SELECT AUDIO VOLUME Automatic adjust color Moves the OSD Menu Moves the OSD Menu OSD display time OSD Transparency Select OSD language Factory default values DVI, ANALOG Mode Change Sound Mute On/Off function. *1 You can adjust the volume. *1

*1 : For Audio Model Only

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Q74A Service Manual

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

After factory set executes, power OFF

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 signal 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.

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Q74A Service Manual

INVERTER & POWER
Inverter & POWER(Q74A)
L.I.P.S : LCD INVERTER POWER SYSTEM(FLF1742-20A)

Specification
Operate 4 CCFL Lamps. Current Feedback Control Input Voltage : DC 12V. When any lamp doesn't operate, the panel is under protection status. Protection status means that circuit protect the other lamp. PWM Control. Remote Power On/Off control High Efficiency

Electrical Characteristics
Description Input Voltage Input Current Output Current Lamp Frequency Min 11.0 1.5 5.0 40 Typ 12.0 1.7 6.0 47 Normal Operation ON/OFF Control Shunt-down(Lamp off) Kick-Off Voltage OFF Max 13.0 1.9 7.0 55 Sign Vin A mArms kHz ON Vin=12V ON/OFF=5V Vin=12V ON/OFF=0V Kick-Off 12Vdc 1ccfl current Remark

MORE THAN 1100

Vrms

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Q74A Service Manual

Pin Connection
- INPUT CONNECTOR CON1 Pin NO. 1,2 3,4,7 5,6 8 9 Symbol VIN 1 GND VIN 2 ON/OFF NC Descripition Input Voltage : 12V GND Inopt Voltage : 5V Power System Return NC

- OUTPUT CONNECTOR CN1,2,3,4 Pin NO. 1 2 Symbol HV1,2,3,4 LV1,2,3,4 Descripition HI VOLTAGE TERMINAL LOV VOLTAGE TERMINAL

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Q74A Service Manual

TROUBLESHOOTING
No operating at all
What you see Is the power inserted correctly? Does the Power Adapter Suggested Actions Insert the plug correctly referring to the User Manual. operate Check the Power Adapter. The green LED is OK.

correctly?

The Power Adapter operates correctly, Check the harness of the FUNC. B/D. but the LCD Monitor does not operate correctly. Does The Power On/Off and the LED If the program of the MICOM is error, then exchange the Operate corretly? MICOM. If the AD B/D is error, then exchange the AD B/D. The Power On/Off and the LED operate First, operate the FACTORY SET. correctly, but the OSD menu doesn't Second, check the Panel Harness that is connected to the AD display on screen. B/D. Check the LAMP Harness of the Panel. Lastly, exchange the LIPS. The OSD menu operates correctly but Insert the SIGNAL Cable correctly referring to the User the image doesn't display on screen. Manual. Check the LAMP Harness of Panel and Inverter. Lastly, Check the LAMP of Panel. The Power On/Off operates correctly, The LAMP is OK. but the screen is `ALL WHITE'. Check the Panel Harness that is connected to the AD B/D.

The Power On/Off operates correctly, Check the LAMP Cable. but the screen is `ALL BLACK'. Check or exchange the LIPS. Check the Panel Cable.

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Q74A Service Manual

Doesn't display on LCD
"VIDEO MODE NOT SUPPORTED" message [Windows] Reboot safe mode. (press the F8 key during booting). 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) 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 Noise in vertical pattern. Check the signal cable. Check scaler input signal (RGB,H-SYNC,V-SYNC) 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. Check the signal cable. Check pins of the signal cable. Check HS_VGA and VS_VGA in schematics.

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Q74A Service Manual

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 Because of viewing angle. lower on screen.

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Q74A Service Manual

EXPLODE VIEW
Q74A

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Q74A Service Manual

PART LIST
Q74A Mechanical Part List

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Q74A Service Manual
Q74A AD B/D Part List
Location
CE16 CE5,CE6,CE12, 16V 100uF 20% 6.3X11 TAP CE13,CE14, CE15 CE7, CE8, CE9, CE10, CEXF1C100A CE11 CON1 C6, C7, C8, C10, C11, C12, C18,C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29, C30, HCCK104ZBA C31, C34, C37, C38, C39, C40, C41, C42, C43, C44, C45, C46, C47, C48, C49 C CHIP CERA 50V 100nF Z 1608 97E6200710 CONN WAFER 12507WR-30000 (30P LVDS) C ELECTRO 16V 10uF 20% 5x11 TAP CEXF1C101A C ELECTRO Parts Code CEXF1C471A

Parts Name
C ELECTRO

Parts Spec.
16V 470uF 20% 10x12.5 TAP

Remark

C9 C13, C14, C15

HCCH103KBA C CHIP CERA HCCK200JBA HCCK330JBA C CHIP CERA C CHIP CERA C CHIP CERA C CHIP CERA C CHIP CERA

25V 10nF K 1608 50V 20pF J 1608 50V 33pF J 1608 50V 220pF J 1608 50V 100pF J 1608 50V 22pF J 1608

C17 C35, C36 C32, C33 DZ1, DZ2, DZ3 ,DZ4,

HCCK221JBA HCCK101JBA HCCK220JBA

DUDZS5.6BDZ5, DZ6 DZ7 D2, D3, D4, D5, D6, D7, D8, DBAV99---D9, D10D11, D12, D13, D14,D15, D16

ZENOR DIODE

UDZS 5.6B(SOD-323), ROHS

DZMM55C5V6 ZENER DIODE

ZMM55C5V6

CHIP DIODE

BAV99 (SOT-23)

CIM10J121NC(BEAD_120 FB4, FB5, FB7 FB3, FB6, R60 HFA1608121 HRFS000JBA BEAD CHIP ohm_1608) R CHIP 1/16W 0 ohm J 1608

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Q74A Service Manual
FB8 J4 HFA3216121 97E6200110 BEAD CHIP 15-PIN D-SUB CIM31J121NE (BEAD_120ohm_3216) HDR10-15F-RL

IBP-07R-20T(GIL-S-7P-S2L2-EF) : J5 97E6200734 CONN WAFER Right angle

J6 J7 Q4, Q5 Q2, Q3 R21, R24, R26, R41, R42,

97E6200790 99E6203095 TSBT3904-B TSBT3906-B HRFS103JBA

DVI_29PIN CONN WAFER TR CHIP TR CHIP R CHIP R CHIP

361R02-0 IBP-09S-20T(GIL-S-9P-S2T2-EF) : SBT3904 SBT3906 1/16W 10K J 1608 1/16W 2.2K J 1608

R43, R52, R53, R64, R65 R20 R27, R28, R45, R46, R50, R54, R55, R57, R58, R59, HRFS472JBA R61, R66, R100, R101 R7, R8, R9, R10, R11, R12, R13, R14 R15, R16, R22, R51 R17, R18, R19 R23, R25 R29, R30, R31, R33, R35, HRFS100JBA R36, R37R38, R39, R40 R32, R34 R44 R47, R48, R67, R68 R49 R56 R62 R63 U2 1A111733DC U3 U4 U5 U6 U7 1AP1117E18 1TSUM56AL1AT24C02N1FDC6329L1PS25LV512 IC REGULATOR IC SCALER IC EEPROM IC LOADSWITCH IC FLASH MEMORY HRFS220JBA HRFS821JBA HRFS330JBA HRFS391JBA HRFS223JBA HRFS104JBA HRFS122JBA R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP IC REGULATOR APL1117-33UC-TR(TO-252) AP1117E18A, SOT223-3L TSUM56AL-LF ( MSTAR ) AT24C02N-10SU-2.7 , LEAD FREE FDC6329L SUPERSOT TM-6 , ROHS PS25LV512 ( MSTAR ) , 512KBIT , 1/16W 22 ohm J 1608 1/16W 820 ohm J 1608 1/16W 33 ohm J 1608 1/16W 390 ohm J 1608 1/16W 22K J 1608 1/16W 100K J 1608 1/16W 1.2K J 1608 R CHIP 1/16W 10 ohm J 1608 HRFS750JBA HRFS201JBA R CHIP R CHIP 1/16W 75 ohm J 1608 1/16W 200 ohm J 1608 HRFS101JBA R CHIP 1/16W 100 ohm J 1608 R CHIP 1/16W 4.7K J 1608 HRFS222JBA

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Q74A Service Manual
IC EEPROM U8 X1 1AT24C16-(ATMEL) 5XJ14R318E CRYSTAL QUARTZ ROHS 14.3181MHz XTAL2 20pF DIP AT24C16N-10SU-2.7(SOIC 8P),

CE1, CE4 CE2, CE3 C1, C2 C5 C3, C4 C3, C4 D1

CEXF1C471A C ELECTRO CEXF1C102A HCCK104ZBA HCCK105ZBA HCCF474MBA HCCF474KBA DZN4002--C ELECTRO C CHIP CERA C CHIP CERA C CHIP CERA C CHIP CERA DIODE

16V 470uF 20% 10x12.5 TAP 16V 1000uF 20% 10x16 TAP 50V 100nF Z 1608 50V 1uF Z 1608 16V 470nF M 1608 16V 470nF K 1608 1N4002 100V 1A T-26 CIM10J121NC(BEAD_120

FB1, FB2

HFA1608121

BEAD CHIP ohm_1608)

J1 J2, J3 Q1 R4 R2 ,R3 R5, R6 R1 U1

97E6200600 97E6300220 TSBT3904-B HRFS472JBA HRFS103JBA HRFS303JBA HRFS304JBA 1TDA7496L-

CONN WAFER STEREO JACK TR CHIP R CHIP R CHIP R CHIP R CHIP IC AUDIO

53014-0410 ST-320 (5P 3.5pi) SBT3904 1/16W 4.7K J 1608 1/16W 10K J 1608 1/16W 30K J 1608 1/16W 300K J 1608 TDA7496L(ST)

-Red Calor : DVI Part -Blue Calor : AUDIO Part

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Q74A Service Manual
Q74A FUNCTION KEY B/D Part List
Location
PCB J1 J2 R1,R2 R3 SW1,SW2, 5S51280A6SW3,SW4, TACT SWITCH 1280A6 (KNOB-5mm) Parts Code 97E6500843-00 99E6203075 99E6203045 HRFS152JBA HRFS302JBA

Parts Name
FUNCTION_PCB CONN WAFER CONN WAFER R CHIP R CHIP

Parts Spec.
1 LAYER(102.5*15mm) HL711S/D IBP-07S-20T(GIL-S-7P-S2L2-EF) IBP-04S-20T(GIL-S-4P-S2T2-EF) 1/6W 1.5K J 1608 1/6W 3K J 1608

A/J

Remark

Q74A FUNCTION LED B/D Part List
Location
PCB J1 LED SW5 Parts Code 97E6500844-00 99E6203045 DLSAM32705S51280A6-

Parts Name

Parts Spec.

A/J

Remark

LED FUNCTION_PCB 2 LAYER(41.5*15mm) HL711S/D CONN WAFER LED TACT SWITCH IBP-04S-20T(GIL-S-4P-S2T2-EF) LED 3pai 3PIN(2.54-PITCH) 1280A6 (KNOB-5mm)

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Q74A Service Manual
Inverter & POWER BD Part List(FLF1742-20A)
NO. 1 2 3 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 30 31 32 33 34 35 36 37 38 39 40 Ref. LF101 PC101 BD101 D104,105 D103 C105 C103,104 VS1 C101,102 C106 C2 CN100 CN101 IC101 CN1,2,3,4 T101 T3 U1,2 U3 D101 ZD104 D2,4 D5 ZD1,2,3 ZD102 ZD101,103 Q1 C1,17 C8 C13 C6,7,9,12,20 C11,22,24,122 C3,4,14,19,119 R116,117 R114,115 R28,29 R121 R119,122 R1,16,20,22,24 R2,3,10 PART TYPE LFL002A LTV-817B-M,TCET1103 KBP206G SB560 MBR10H150CT CE82u400V85SD,SHL,GS KNB1560MKP-334K VARISTOR 7D471 DG102Y1 DG222Y1 CE220U25V105LXZ,WL,RT SC-8R-F152P32R-GB GIL-S-9P-S2T2-EF FSDM0565R 35002WR-02, JE207-B1T-02 TRSL014A TRS1801U - DIP AP4511GD-DIP BIT3105 - DIP RS1J, UF4007 ZY160 DAN217,BAV99 DAP202U UDZS5.6B,BZT52C5V6S-7 UDZS10B,BZT52C10V0S UDZS20B,BZT52C20V0S 2N3904,MMBT3904 CC106Z10V3216 CC473K50V2012 CC271K50V2012 CC103K50V2012 CC104K50V2012 CC105Z16V2012 CR2012J200 CR2012J181 CR2012J221 CR2012J122 CR2012J332 CR2012J103 CR2012J183 1st. Vendor LITON TSC VISHAY-GS VISHAY-GS ,, ISKRA ILJIN(AMOTECH) , , ,, SUPERCOM LG FAIRCHILD , APEC BITEK TSC SHS Rohm Rohm Rohm Rohm Rohm Rohm ,TDK ,TDK ,TDK ,TDK ,TDK ,TDK 2nd. Vendor GET Vishay DIODES Q,ty 1 1 1 2 1 1 2 1 2 1 1 1 1 1 4 1 1 2 1 1 1 2 1 3 1 2 1 2 1 1 5 4 5 2 2 2 1 2 5 3

PILCO, CNR

JAEEUN GET

SHS DIODES DIODES DIODES DIODES DIODES Rohm Rohm Rohm Rohm Rohm Rohm Rohm

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Q74A Service Manual
Inverter & POWER BD Part List(FLF1742-20A)
NO. 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 Ref. R12 R26 R11 R5 R8,25 R9 R27 R15,19 R126 R123 R124 R101,102,103 R111 R105,106 C112 C113 C115 C117,118 C110 IC102 BC102 C5,10 D102 TH101 F101 P.W.B FR-1 PART TYPE CR2012J433 CR2012J753 CR2012J134 CR2012J154 CR2012J224 CR2012J824 CR2012J105 CR2012F3600 CR2012F1431 CR2012F1801 CR2012F2702 CR3216J334 RD 1/4W J 3.9 OHM RD 1/4W J 33K OHM 221K 1KV 222K 1KV CE680u25V105RD,KM CE1000u10V105RD,KM
CE47U50V 85/CE47U50V 105

TL431A EBFL001A CL100K3K PR1003, FR104 SCK08053MS,NTC 5D-9 SR-5 3.15A PL1742C20

1st. Vendor ,, ,, ,, Fair Child Diodes Thinking

2nd. Vendor Rohm Rohm Rohm Rohm Rohm Rohm Rohm Rohm Rohm Rohm Rohm Rohm

GET

Q,ty 1 1 1 1 2 1 1 2 1 1 1 3 1 2 1 1 1 2 1 1 1 2 1 1 1 1

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Q74A Service Manual
CIRCUIT DIAGRAM
AD B/D(Q74A)

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Q74A Service Manual

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J5
+5V

+5V

SCALER & PANEL
KEY_INTERFACE
+5V
R50 4.7K
VDDP_3.3

VCC LED_G LED_R GND

7 6 5 4

KEY 1 KEY 2 GND
BKLT-VBRI
DIM_ADJ

3 2 1
R51 100

3

D7

3

D8
200

10K

BAV99

BAV99
VDDC_1.8
4.7K
4.7K

10K

+5V

C39 0.1uF

1

2

1

2

R23

R24

R25 200

2

2

R26

Q2 SBT3906

Q3 SBT3906

R27

R28

1

1

R54 4.7K

R55 4.7K

BKLT-EN
3
3

223

R56

R32

22

C40 0.1uF

Q4 SBT3904

R60 0
C41 0.1uF

INV_ON

R34

22

+5V

DVI_INPUT
+
GND_POWER
10K

MUTE

R41

INV N _O

C32
VDDC_1.8
R42
X1 14.318MHZ

22p

1

1

TP3 TP4
VDDP_3.3
BT1 BT2 BT3 BT4 BT6 BT7 BT8 BT9 BT10BT11BT13
1

C33
1

22p
1

1

1

1

1

1

1

1

SDA_DVI
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81

1

AVDD_MPLL_3.3
1

TP31
U4

V LUM O E R100 4.7K R101 4.7K 1

DET DVI

DIM DJ _A

CE 11 10uF/16V

TP5

10K

PANEL_INTERFACE
1

AVDD_DVI_3.3

RX2+ RX2-

RX1+ RX1-

BINM BIN GINM GIN SOGIN RINM RIN

RXE0RXE0+ RXE1RXE1+ RXE2RXE2+ RXECRXEC+

AVDD_ADC_3.3
RXE3RXE3+

C38

0.1uF

HSY NC VSY NC

1 2 3 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 30

1

1

1

1

1

1

1

1

1

DSDA DSCL

CON1 RXO0RXO0+ 1 RXO1- 2 RXO1+ 3 4 RXO2- 5 RXO2+ 6 RXOC- 7 RXOC+ 8 RXO3- 9 RXO3+ 10 11 RXE0- 12 RXE0+ 13 RXE1- 14 RXE1+ 15 16 RXE2- 17 RXE2+ 18 RXEC- 19 RXEC+ 20 RXE3- 21 RXE3+ 22 23 24 25 26 27 28 29 30

DDCA CL _S V DDP G ND V DDC G IO 15/P M P _P W 0 NC S DO CS Z S CK S DI G IO 23 P _P G IO 22 P _P G IO 11/I2C_M P _P DA G IO 10/I2C_M P _P CL NC NC G IO 24/P M P _P W 2 G IO 27/P M P _P W 1 V DDP G ND

10K

R52

R53

10K

BT14BT15BT16BT18BT19BT20BT21BT22BT23

31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

+5V

4.7K

4.7K

R58

R59

R57

VDDP_3.3

4.7K

+5V

4.7K

3

U6
4

FDC6329L
1
CE14 +
5
Y TN On-Of f V_Out2 V_Out1

VDDP_3.3

3
2

ON_Pannel
R61

ON_Pannel

2

ST_DET
1TP30

Q5 SBT3904
VDDP_3.3

R62 100K
100uF/16V
C42 0.1uF

CE15
6
R1_C1 R2 1

1TP28 1TP29

+ 100uF/16V

31 32
C43 0.1uF

DDCD_SCL GND R+ RGND G+ GAVDD_DVI B+ BGND CK+ CKAVDD_DVI REXT AVDD_PLL BIN0M BIN0P GIN0M GIN0P SOGIN0 RIN0M RIN0P AVDD_ADC REFM REFP HSY NC0 VSY NC0 GND DDCA_SDA

BY PASS GND LVB0M LVB0P GND VDDP LVB1M LVB1P LVB2M LVB2P LVBCKM LVBCKP LVB3M LVB3P VDDC LVA0M LVA0P LVA1M LVA1P LVA2M LVA2P LVACKM LVACKP GND VDDP LVA3M LVA3P MODE[1] MODE[0] VDDC

80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51

C44 0.1uF
R63

1

1

1

BT25BT26BT27

1

BT24

1

C480.1uF

FLASH_MEMORY

EEPROM

C49 0.1uF

-28TSUM56AL-LF
RXO1RXO1+ RXO2RXO2+ RXOCRXOC+ RXO3RXO3+

AVDD_PLL_3.3

RX0+ RX0-

RXC+ RXC-

DDCD_S DA G IO 16/P M2 P _P W A DD_M LL V P X UT O X IN G IO 14 P _P G IO 13 P _P G IO 26/P M0 P _P W G IO 07 P _P G IO 06 P _P G IO 02/S R3 P _P A G IO 01/S R2 P _P A G IO 00/S R1 P _P A RS TN G IO 25/P M1 P _P W G IO 12 P _P RS T G ND V DDC V CTRL

SCL_DVI
C37 0.1uF RXO0RXO0+

R49

390

BT17

1

BT5 BT12

12507W R-30

C45

R64
U7

10K
R66
1.2K

U8
R65 10K

0.1uF

1 2 3 4
CS SO WP GND
VCC HOLD SCK SI

8 7 6 5

1 2 3 4
A0 A1 A2 GND VCC WP SCL SDA

8 7 6 5

R67 R68

33 33

4.7K

C47 0.1uF

PS25LV512(SOIC)

AT24C16(SOIC)

DESIGN

CHECK

APPROVAL

Model

HL720D
Title

Q74A Service Manual

SCALER & PANEL
Document Number Rev

WooYoung Telecom Co., Ltd.

0
Sheet
of

AUDIO_PART
+12V
J1
D1

TP1

1

R1

VOLUME

300K

C1
C2

2

1

R2
U1
0.1uF

CE1
1N4002/DIP

1 2 3 4

0.1uF
470uF/16V

LEFT GND GND RIGHT

SPEAKER WAFER
12507WR-04A
J2

10K
1

G1 G20 G19 G18 L_OUT
1000uF/16V

20

GND
G2 G3 LIN VAROUT-L VOL VAROUT-R R_OUT
1000uF/16V
C3

2

19

3

18

CE2

+5V

AIN-L

4

17
16

470nF

5

R3

VCC VCC
14
13
12

1 5 4 3 2

6

15

CE3

TP2

10K

1

3

SBT3904
CE4 TDA7496L 470uF/16V

2

-297
C4

ST-320

Q1

8

R4

AIN-R

NC P13 MUTE STBY
11

MUTE
RIN SVR
470nF

1

9
10

C5

4.7K

1uF

J3

FB1

AIN-L

AUDIO INPUT
ST-320

BEAD_120ohm_1608 FB2

AIN-R
BEAD_120ohm_1608

2 3 4 5 1

R5 30K

R6 30K

Q74A Service Manual

DVI_INPUT
D10 BAV99

+5V

D9 BAV99

D11 BAV99

D12 BAV99

D13 BAV99

D14 BAV99

D15 BAV99

D16 BAV99

2
1
2

2
1

2
1

2

2

2

1

2

1

1

1

3

3

3

3

3

3

3

3

1

R29 R30

10 10

RX2RX2+

RX2RX2+
RX1RX1+

R31 R33
R35 R36
RX0RX0+
RXCRXC+

10 10
10 10
10 10
SCL-DVI SDA-DVI

RX1RX1+

J6

DVI_30P
R37 R38
R39 R40 10 10

RX0RX0+
RXCRXC+

SCL_DVI SDA_DVI

+5V

R43 R44

10K 820

DET_DVI

DET_DVI

+5V

1 2 DZ4 UDZS5.6B 1 2 DZ5 UDZS5.6B 1 2 DZ6

UDZS5.6B 100pF C35

100pF

31

34

31

34

-30C36
C34 0.1uF

R45

R46 4.7K
R47 33 R48 33

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 C1 C2 C3 C4 C5
4.7K
VCC WP SCL SDA A0 A1 A2 VSS 8 7 6 5

1 2 3 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
1 2 3 4

U5

AT24C02(SOIC)

E E P _ R O M

DVI(Digtial Visual Interface) 29P
1

8
C1 C2

DESIGN

CHECK

APPROVAL

Model

HL720D
Title

9
17

16

DVI INPUT
Document Number Rev

24
C3 C4
WooYoung Telecom Co., Ltd.

0
Sheet
of

Q74A Service Manual

Q74A Service Manual
5V

J1

R carbon film(T-52 Small)
R3 R2 KEY 1 1.5K 3K SW4 STS-1102A-1 SW3 STS-1102A-1

1

6

GND
R1 KEY2 1.5K SW2 STS-1102A-1 SW1 STS-1102A-1 5

J2 4

GND
LED_GREEN

3

3

2

LED_RED

2

4 7 1 CON4 CON8

GND

GND

J3

SW5
KEY 1
4

STS-1102A-1
CON4

LED_Green

3

LED1 SAM5270
1

3

LED_RED

2

2

1

GND

-31-

Q74A Service Manual
Inverter & POWER B/D(FLF1742-20A) - Adapter Cutcuit

-32-

Q74A Service Manual
-Inverter Circuit

-33-

Q74A Service Manual
PCB Layout
AD B/D TOP SILK (Q74A)

-34-

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-