BenQ Q74A Service Manual Download Page 6 | Manualshive

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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. .

-6-

All manuals and user guides at all-guides.com

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Summary of Contents for Q74A

Page 1: ...Q74A Service Manual All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 2: ...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...

Page 3: ...D 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 Q74...

Page 4: ...ively 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 pl...

Page 5: ...e 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 li...

Page 6: ...r 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 de...

Page 7: ...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 Onl...

Page 8: ...ted 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 o...

Page 9: ...gree 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 Environme...

Page 10: ...00 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...

Page 11: ...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 M...

Page 12: ...tory 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 chage...

Page 13: ...at 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 Cu...

Page 14: ...ipition 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...

Page 15: ...f 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 Pa...

Page 16: ...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 Corr...

Page 17: ...pt 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 Brig...

Page 18: ...Q74A Service Manual EXPLODE VIEW Q74A 18 All manuals and user guides at all guides com...

Page 19: ...Q74A Service Manual PART LIST Q74A Mechanical Part List 19 All manuals and user guides at all guides com...

Page 20: ...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 CE...

Page 21: ...19 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...

Page 22: ...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...

Page 23: ...T2 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...

Page 24: ...17 T3 TRS1801U DIP 1 18 U1 2 AP4511GD DIP APEC 2 19 U3 BIT3105 DIP BITEK 1 20 D101 RS1J UF4007 TSC SHS 1 21 ZD104 ZY160 SHS 1 22 D2 4 DAN217 BAV99 Rohm DIODES 2 23 D5 DAP202U Rohm 1 24 ZD1 2 3 UDZS5...

Page 25: ...Rohm 1 50 R123 CR2012F1801 Rohm 1 51 R124 CR2012F2702 Rohm 1 52 R101 102 103 CR3216J334 Rohm 3 53 R111 RD 1 4W J 3 9 OHM 1 54 R105 106 RD 1 4W J 33K OHM 2 55 C112 221K 1KV 1 56 C113 222K 1KV 1 57 C115...

Page 26: ...Q74A Service Manual 26 CIRCUIT DIAGRAM AD B D Q74A All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 27: ...Q74A Service Manual 27 Q74A Service Manual 27 All manuals and user guides at all guides com...

Page 28: ...61 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 Y TN On Of f R1_C1 V_Out2 V_Out1 R2 RXE2 BT26 1 DIM_ADJ C49 0 1uF RXOC PS25LV5...

Page 29: ...1 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...

Page 30: ...RX2 R45 4 7K RX1 SDA_DVI RX0 U5 AT24C02 SOIC 1 2 3 4 5 6 7 8 A0 A1 A2 VSS SDA SCL WP VCC DZ4 UDZS5 6B 1 2 8 R35 10 R44 820 24 RXC C1 RXC R29 10 RX0 DVI Digtial Visual Interface 29P 0 DVI INPUT HL720D...

Page 31: ...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...

Page 32: ...Q74A Service Manual Inverter POWER B D FLF1742 20A Adapter Cutcuit 32 All manuals and user guides at all guides com...

Page 33: ...Q74A Service Manual Inverter Circuit 33 All manuals and user guides at all guides com...

Page 34: ...Q74A Service Manual 34 PCB Layout AD B D TOP SILK Q74A All manuals and user guides at all guides com...

Page 35: ...Q74A Service Manual AD B D TOP PATTERN Q74A 35 All manuals and user guides at all guides com...

Page 36: ...Q74A Service Manual AD B D BOTTOM SILK Q74A 36 All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 37: ...Q74A Service Manual AD B D MASK TOP Q74A 37 All manuals and user guides at all guides com...

Page 38: ...Q74A Service Manual AD B D MASK BOTTOM Q74A 38 All manuals and user guides at all guides com...

Page 39: ...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 All manuals and user guides at all guides com...

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