BenQ Q74A Service Manual
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BenQ Q74A Service Manual

Lcd monitor
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Q74A
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Summary of Contents for BenQ Q74A

  • Page 1 Q74A Service Manual...

  • Page 2: Table Of Contents

    ▶ 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 ▶...
  • Page 3 ▶ 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...

  • Page 4: Precautions

    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.
  • Page 5 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.

  • Page 6: Items

    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.

  • Page 7: How To Connect The Several Cables To The Lcd Monitor

    Q74A Service Manual HOW TO CONNECT THE SEVERAL CABLES TO THE LCD MONITOR ▶ Setting up the LCD monitor Name Cable connections Power Power Cord 15-pin D-Sub Signal Cable DVI-D Cable *1 SPK IN Audio Cable *2 SPK OUT External Speaker Cable *2...

  • Page 8: Adjusting The Monitor

    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.

  • Page 9: Q74A Specirications

    Q74A Service Manual Q74A SPECIRICATIONS ▶ Q74A Specifications MODE Analog Digital Type TFT active matrix 17 inch Size Panel 337.92 X 270.336 (mm) Pixel Pitch 0.264 X 0.264 (mm) Display Color 8-bit (16,777,216 colors) Display Basic 1280x1024@60Hz Resolution Maximum 1280x1024@75Hz...

  • Page 10: Display Modes

    Q74A Service Manual DISPLAY MODES Horizontal Vertical Pixel Clock Sync Mode Resolution Frequency(KHz) Frequency(Hz) (MHz) Polarity(H/V) 720 X 400 31.468 70.087 28.322 31.468 59.940 25.175 640 X 480 35.000 66.670 30.240 37.500 75.000 31.500 37.879 60.300 40.000 SVGA 800 X 600 48.077...

  • Page 11: Osd Menu

    Q74A Service Manual OSD MENU ▶ Menu Tree Main Menu Sub Menu Function Description PICTURE 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...

  • Page 12: Factory Set

    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.

  • Page 13: Inverter & Power

    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.

  • Page 14: Pin Connection

    Q74A Service Manual ▶ Pin Connection - INPUT CONNECTOR CON1 Pin NO. Symbol Descripition VIN 1 Input Voltage : 12V 3,4,7 VIN 2 Inopt Voltage : 5V ON/OFF Power System Return - OUTPUT CONNECTOR CN1,2,3,4 Pin NO. Symbol Descripition HV1,2,3,4...

  • Page 15: Troubleshooting

    Q74A Service Manual 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 Check the Power Adapter. correctly? The green LED is OK.

  • Page 16: Doesn't Display On Lcd

    Q74A Service Manual ▶ Doesn’t display on LCD “VIDEO MODE NOT [Windows] SUPPORTED” message 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.
  • Page 17 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.

  • Page 18: Explode View

    Q74A Service Manual EXPLODE VIEW ▶ Q74A -18-...

  • Page 19: Part List

    Q74A Service Manual PART LIST ▶ Q74A Mechanical Part List -19-...

  • Page 20: Q74A Ad B/D Part List

    Q74A Service Manual ▶ Q74A AD B/D Part List Location Parts Name Parts Spec. Remark Parts Code CE16 16V 470uF 20% 10x12.5 TAP CEXF1C471A C ELECTRO CE5,CE6,CE12, 16V 100uF 20% 6.3X11 TAP CE13,CE14, CEXF1C101A C ELECTRO CE15 CE7, CE8, CE9, CE10,...
  • Page 21 Q74A Service Manual HFA3216121 BEAD CHIP CIM31J121NE (BEAD_120ohm_3216) 97E6200110 15-PIN D-SUB HDR10-15F-RL IBP-07R-20T(GIL-S-7P-S2L2-EF) : 97E6200734 CONN WAFER Right angle 97E6200790 DVI_29PIN 361R02-0 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,...
  • Page 22 Q74A Service Manual IC EEPROM AT24C16N-10SU-2.7(SOIC 8P), 1AT24C16-- (ATMEL) ROHS 적용품 5XJ14R318E CRYSTAL QUARTZ 14.3181MHz XTAL2 20pF DIP CEXF1C471A C ELECTRO 16V 470uF 20% 10x12.5 TAP CE1, CE4 C ELECTRO 16V 1000uF 20% 10x16 TAP CE2, CE3 CEXF1C102A 50V 100nF Z 1608...

  • Page 23: Q74A Function Key B/D Part List

    Q74A Service Manual ▶ Q74A FUNCTION KEY B/D Part List Location Parts Name Parts Spec. Remark Parts Code 97E6500843-00 FUNCTION_PCB 1 LAYER(102.5*15mm) HL711S/D 99E6203075 CONN WAFER IBP-07S-20T(GIL-S-7P-S2L2-EF) 99E6203045 CONN WAFER IBP-04S-20T(GIL-S-4P-S2T2-EF) R1,R2 HRFS152JBA R CHIP 1/6W 1.5K J 1608 HRFS302JBA...

  • Page 24: Inverter & Power Bd Part List(Flf1742-20A)

    Q74A Service Manual ▶ Inverter & POWER BD Part List(FLF1742-20A) NO. Ref. PART TYPE 1st. Vendor 2nd. Vendor Q,ty 1 LF101 LFL002A 동흥 2 PC101 LTV-817B-M,TCET1103 LITON Vishay 3 BD101 KBP206G 4 D104,105 SB560 VISHAY-GS DIODES 5 D103 MBR10H150CT VISHAY-GS...

  • Page 25: Inverter & Power Bd Part List(Flf1742-20A)

    Q74A Service Manual ▶ Inverter & POWER BD Part List(FLF1742-20A) NO. Ref. PART TYPE 1st. Vendor 2nd. Vendor Q,ty 삼성 Rohm 41 R12 CR2012J433 삼성 Rohm 42 R26 CR2012J753 삼성 Rohm 43 R11 CR2012J134 삼성 Rohm 44 R5 CR2012J154 삼성...

  • Page 26: Circuit Diagram

    Q74A Service Manual CIRCUIT DIAGRAM ▶ AD B/D(Q74A) -26-...
  • Page 27 Q74A Service Manual Q74A Service Manual -27- -27-...
  • Page 28 Q74A Service Manual 4.7K 0.1uF 10uF/16V CTRL 27/P 24/P 4.7K 25/P 4.7K 10/I2C_M 00/S 11/I2C_M 01/S 02/S 4.7K R101 4.7K R100 26/P MUTE 15/P DD_M 16/P DDCD_S DDCA 4.7K C480.1uF 4.7K 4.7K -28-...
  • Page 29 Q74A Service Manual -29-...
  • Page 30 Q74A Service Manual 100pF 100pF UDZS5.6B UDZS5.6B UDZS5.6B -30-...
  • Page 31 Q74A Service Manual R carbon film(T-52 Small) KEY 1 1.5K STS-1102A-1 STS-1102A-1 KEY2 1.5K STS-1102A-1 STS-1102A-1 LED_GREEN LED_RED CON4 CON8 KEY 1 STS-1102A-1 CON4 LED_Green LED1 SAM5270 LED_RED -31-...

  • Page 32: Inverter & Power B/D(Flf1742-20A)

    Q74A Service Manual ▶ Inverter & POWER B/D(FLF1742-20A) - Adapter Cutcuit -32-...
  • Page 33 Q74A Service Manual -Inverter Circuit -33-...

  • Page 34: Pcb Layout

    Q74A Service Manual PCB Layout ▶ AD B/D TOP SILK (Q74A) -34-...

  • Page 35: Ad B/D Top Pattern (Q74A)

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

  • Page 36: Ad B/D Bottom Silk (Q74A)

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

  • Page 37: Ad B/D Mask Top (Q74A)

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

  • Page 38: Ad B/D Mask Bottom (Q74A)

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

  • Page 39: Func B/D Top Silk (Q74A)

    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-...

Table of Contents