BenQ Q7T4-FP71G Service Manual
  1. Manuals
  2. Brands
  3. BenQ Manuals
  4. Monitor
  5. Q7T4-FP71G
  6. Service manual
BenQ Q7T4-FP71G Service Manual

BenQ Q7T4-FP71G Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Q7T4-FP71G LCD Monitor Service Guide
1. Alignment procedure (for function adjustment)
A. Preparation:
1. Setup input timing ICL-605( 1280x1024@75Hz ), 32-Grays pattern.
2. Setup unit and keep it warm up at least 30 minutes.
B. Timing adjustment:
1. Enter factory setting area (press "ENTER", "EXIT" and then press "SOFTPOWER").
2. Check the settings to following values:
Then, turn off the monitor power.
3. Turn on power enter user area.
C. Color balance adjustment:
1. Enter factory setting area (press "ENTER", "I-Key" and then press "SOFTPOWER").
2. Setup input timing ICL-605(1280x1024@75Hz), 32-Gray pattern (pattern 48) .
3. Press "I-KEY", and than OSD will show "White Balance" item and than press "ENTER" button
to do auto color.
Contrast = 50
Brightness = 90
OSD time = 20
Color = Normal
Language = English
Confidential

Alignment Procedure

1

Advertisement

Table of Contents
loading

Related Manuals for BenQ Q7T4-FP71G

Summary of Contents for BenQ Q7T4-FP71G

  • Page 1 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure 1. Alignment procedure (for function adjustment) A. Preparation: 1. Setup input timing ICL-605( 1280x1024@75Hz ), 32-Grays pattern. 2. Setup unit and keep it warm up at least 30 minutes. B. Timing adjustment: 1. Enter factory setting area (press “ENTER”, “EXIT” and then press “SOFTPOWER”).
  • Page 2 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure D. Color adjustment: 1. Setup input timing ICL-605, white pattern . 2. Confirm auto color adjustment had already done. 3. Measure color temperature by Minolta CA-110 (or equivalent equipment). 4. Check the color temperature Bluish, Reddish & Normal. The color temperature specification...
  • Page 3 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure 5. Setup input timing , 32 -Gray pattern. To check if there are any abnormal display problems of preset timing modes . Check the following preset timings with General pattern: Mode 720×400 @ 70Hz 31.468...
  • Page 4 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure √ Write C3 (Reddish) R-Gain Data to EEPROM Data cksum √ Write C3 (Reddish) G-Gain Data to EEPROM Data cksum √ Write C3 (Reddish) B-Gain Data to EEPROM Data cksum √ Write User R-Gain Data to EEPROM Data cksum √...
  • Page 5 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure 1=C1/9300/Bluish, 2=C2/6500/sRGB/, 3=C3/5800/Reddish, √ 4=User, 5=Cx Read C/T index from EEPROM XX cksum √ Read OSD-Hpos EEPROM XX cksum √ Read OSD-Vpos from EEPROM XX cksum 0=DE, 1=EN, 2=ES, 3=FR, √ 4=IT, 5=JA, 6=繁中, 7=簡中...
  • Page 6 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Note A: Byte4 (cksum) = Byte1 + Byte2 + Byte3 Note B: Data = The value write to MCU or EEPROM Note C: XX = don't care, any value (<=0xFF). When PC Host sends 0x7D command to MCU, MCU must return as following (2 bytes)
  • Page 7 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure 4. Wire Dressing and assembling concern Prepare 1 panel Assembly panel and main BKT Confidential...
  • Page 8 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Add 4 screw between panel and main BKT Confidential...
  • Page 9 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Add FFC Confidential...
  • Page 10 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Add Tape Confidential...
  • Page 11 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Assembly IF board and Power Board Confidential...
  • Page 12 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Assembly PCB module and main BKT Confidential...
  • Page 13 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Assembly IF board and FFC Confidential...
  • Page 14 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Add one tape Confidential...
  • Page 15 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Assembly lamp wire and Power Board Confidential...
  • Page 16 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Add one screw Confidential...
  • Page 17 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Add 5 screw Confidential...
  • Page 18 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Assembly main shielding and main BKT Confidential...
  • Page 19 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Add 2 screw Confidential...
  • Page 20 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Assembly control board wire and IF board Confidential...
  • Page 21 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Confidential...
  • Page 22 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Add one tape Confidential...
  • Page 23 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Assembly Bezel and Rear Cover Confidential...
  • Page 24 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Add 4 screw Confidential...
  • Page 25 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Add 1 screw Confidential...
  • Page 26 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Assembly Base and Rear cover Confidential...
  • Page 27 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Finished Confidential...
  • Page 28 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Confidential...
  • Page 29 Q7T4-FP71G LCD Monitor Service Guide Alignment Procedure Confidential...
  • Page 30 Q7T4-FP71G LCD Monitor Service Guide Circuit Operation Theory I. Introduction: The Q7T4 is a 17” SXGA (1280x1024) , 16.2M colors(R, G, B 6-bit data+FRC data) TFT LCD monitor. It’s an analog only interface LCD monitor with a 15 pins D-sub signal cable. it’s compliant with VESA specification to offer a smart power management and power saving function.
  • Page 31 Q7T4-FP71G LCD Monitor Service Guide Circuit Operation Theory Clock MTV312M Generator 64(AJ) 1280×1024 RTD 2023 140MHz D-SUB Keypad (a) Circuit operation theory: A basic operation theory for the interface board is to convert input signal into digital RGB . Analog RGB signal is converted to digital signal through ADC. The microprocessor RTD2023 receives video data and optimizes the image automatically.
  • Page 32 Q7T4-FP71G LCD Monitor Service Guide Circuit Operation Theory support detect mode and DPMS control. 3.) MTV312M64: To stored the source code which is accessed by MCU to run program. 4.) EEPROM: We use 24C04 to store all the adjustable data and user settings.And use 24C02 to store DVI EDID data.
  • Page 33 Q7T4-FP71G LCD Monitor Service Guide Circuit Operation Theory #1 EMI Filter This circuit (fig. 2) is designed to inhibit electrical and magnetic interference for meeting FCC, VDE, VCCI standard requirements. Fig. 2 #2 Rectifier and filter AC Voltage (90-264V) is rectified and filtered by BD601, C605 (See Fig 3) and the DC Output voltage is 1.4*(AC input).
  • Page 34 Q7T4-FP71G LCD Monitor Service Guide Circuit Operation Theory #3 Switching element and Isolation power transformer When the Q601 turns on, energy is stored in the transformer. During Q601 turn-off period, the stored energy is delivered to the secondary of transformer. R607, C607 and D601 is a snubber circuit.
  • Page 35 Q7T4-FP71G LCD Monitor Service Guide Circuit Operation Theory #5 PWM Controller The PWM controller NCP1200A implements a standard current mode architecture. With an internal structure operating at a fixed 40KHz. Where the switch time is dictated by the peak current set-point. When the current set-point falls below a given value.
  • Page 36 Q7T4-FP71G LCD Monitor Service Guide Circuit Operation Theory Fig. 7 A-3.) Control board introduction: The main parts of the control board are a push button, and a LED. (a) Push button: It’s a simple switch function, pressing it for “ON” to do the auto adjustment function, releasing it for “OFF”...
  • Page 37 Q7T4-FP71G LCD Monitor Service Guide Circuit Operation Theory A-4.) Inverter diagram: 1.Block Diagram: ON/OFF OSCILATOR TRANSFORMER CCFL 15Vin switching CIRCUIT ON/OFF PWM CONTROLLER PROTECTION TL1451 CIRCUIT AND DETECT BRT_ADJ 2. General Specification Input Voltage: 15V Input Current: 2A max. ON/OFF Voltage: 5V...
  • Page 38 Q7T4-FP71G LCD Monitor Service Guide Circuit Operation Theory 3.Circuit Operation Theorem 3.1 ON/OFF SWITCH The turn-on voltage was controlled by R815 and R816.The inverter was turned on or off by the switching transistors Q801 and Q802. Confidential...
  • Page 39 Q7T4-FP71G LCD Monitor Service Guide Circuit Operation Theory 3.2 PWM Control circuit TL1451 is a dual PWM controller.C807 and R811 decide the working frequency.BLT_ADJ signal is from control board, control pulse width then decide how much energy delivery to CCFL also decide CCFL brightness.
  • Page 40 Q7T4-FP71G LCD Monitor Service Guide Circuit Operation Theory 3.3 Oscillator Circuit Royer circuit uses the characteristic of transformer saturation to oscillate. When the DC power inject, Q808 or Q809 will turns on, and the current Ic increases. After a period, the transistor will leave the saturation status and Vce increase.
  • Page 41 CON301 SW301 2240069431 I _KEY KEY_MENU KEY_EXIT LED301 BLU/ORG KEY_LEFT SW302 2240069431 KEY_ RIGHT KEY_ RIGHT KEY_MENU PW_SW 2060089110 SW303 2240069431 KEY_LEFT SW306 2240069431 PW_SW SW304 2240069431 KEY_EXIT SW305 2240069431 I _KEY LED use 06.3N5YG.14X; Key use 22.40069.431 Project Code Model Name OEM/ODM Model Name Q7T4...
  • Page 42 Q7T4-FP71G LCD Monitor Service Guide Engineering Specification Table of Contents 1. Introduction 2. Operational Specification 2.1 Power supply..........................3 2.2 Signal interface ..........................4 2.3 Video performance ........................5 2.4 Scan range ............................. 6 2.5 Plug & Play DDC2B Support ....................... 6 2.6 Support Timings ..........................
  • Page 43 Q7T4-FP71G LCD Monitor Service Guide Engineering Specification Table of Contents 7. Pallet & Shipment 7.1 Container Specification......................... 12 7.2 Carton Specification........................12 Product: ..........................12 Package: ..........................12 8. Certification Appendix: Physical Dimension Front View and Side view Confidential...

  • Page 44: Operational Specification

    Q7T4-FP71G LCD Monitor Service Guide Engineering Specification 1. Introduction This specification describes Q7T4, which is a 17.0” analog interface color TFT LCD monitor without audio. The monitor supports up to 1280x1024 pixel resolution and refresh rate of 75 Hz. The independent 6 bits R, G, B colors are capable of displaying 16.2M colors (RGB-6bit + FRC data).

  • Page 45: Signal Interface

    Q7T4-FP71G LCD Monitor Service Guide Engineering Specification Item Condition Spec OK N.A Remark √ Input Voltage range Universal input full range 90~264VAC /47~63Hz √ Input Current range 90 ~ 264VAC < 2.0 Arms √ Power Consumption Normal “On” operation < 40 W LED: Green <...
  • Page 46 Q7T4-FP71G LCD Monitor Service Guide Engineering Specification Signal Assignment Signal Assignment Red video PC5V (+5 volt power) Green video Sync Ground Blue video Ground Ground Cable Detected H-Sync (or H+V) Red Ground V-sync Green Ground Blue Ground Note-2: The pin assignment of 24-pin DVI-D connector is as below,...

  • Page 47: Scan Range

    Q7T4-FP71G LCD Monitor Service Guide Engineering Specification 2.4 Scan range Item Condition Spec OK N.A Remark √ Horizontal 30 ~ 83 KHz √ Without Frame buffer Vertical 56 ~ 76 Hz 2.5 Plug & Play DDC2B Support Item Condition Spec OK N.A...

  • Page 48: Brightness Adjustable Range

    Q7T4-FP71G LCD Monitor Service Guide Engineering Specification 3. Operational & Functional Specification 3.1 Video performance Item Condition Spec OK N.A Remark Any input resolution modes √ Resolution 1280 x 1024 which are under 1280 x 1024 √ Contrast ratio 450:1 (typ.) √...

  • Page 49: Electrostatic Discharge Requirements

    Q7T4-FP71G LCD Monitor Service Guide Engineering Specification (2) Random 5 ~100 Hz, 0 dB/Oct. 0.015 100 ~200 Hz, -6 dB/Oct. 200 Hz, 0.0038 g Equivalent to 1.47 Grms, All primary axis, 20 min per- orientation, total is 60 min. (3) Procedure:...

  • Page 50: Audio Performance

    Q7T4-FP71G LCD Monitor Service Guide Engineering Specification 3.9 Audio performance Item Condition Spec OK N.A Remark Preamp + Power amp √ (1)Output power 1 Wrms/CH @ 1KHz √ (2)THD (@ 1W) <1% √ (3)S/N ratio >40dB Speaker Driver √ (1)Nominal impedance 8 ohm √...

  • Page 51: User Controls

    Q7T4-FP71G LCD Monitor Service Guide Engineering Specification Green x 0.26 0.29 0.32 Coordinates (CIE) Green y 0.58 0.61 0.64 Blue x 0.11 0.14 0.17 Blue y 0.04 0.07 0.10 White x 0.28 0.31 0.34 Color Coordinates (CIE) White White y 0.30...

  • Page 52: Mechanical Characteristics

    Q7T4-FP71G LCD Monitor Service Guide Engineering Specification D-sub √ Input Select √ Sharpness √ Display Information For input timing √ Volume √ Mute √ Hot key for Brightness √ Hot key for Contrast √ Hot key for Volume √ Hot key for Mode * The detailed firmware functions’...

  • Page 53: Container Specification

    Q7T4-FP71G LCD Monitor Service Guide Engineering Specification 6.4 Carton Item Condition Spec OK N. Remark √ Color Kraft √ Material B Flute √ Compression strength 288 KGF √ Burst Strength 16 KGF/cm √ Stacked quantity 18 Layers 7. Pallet & Shipment 7.1 Container Specification...
  • Page 54 Q7T4-FP71G LCD Monitor Service Guide Engineering Specification √ USA Standard √ TCO’99 √ TCO’03 √ Green Mark √ Microsoft Windows PC98/99 √ DPMS VESA PC-Monitor √ DDC 2B Version 1.3 √ External √ UL (USA) UL60950 3 edition √ CSA (Canada) CAN/CSA-C22.2 No.
  • Page 55 Q7T4-FP71G LCD Monitor Service Guide Engineering Specification Appendix: Physical Dimension Front View and Side view Fig. 1 Physical Dimension Front View and Side view Confidential...
  • Page 56 3.3V_MCU 3.3V_MCU D N 1 BAV70LT1 D N 2 D N 3 D N 4 D N 5 BAV99 BAV99 BAV99 BAV99 P C5V C 20 C 25 C 49 0.01U ESD solution 0.01U J 0.01U J 0.01U J PC5V 0 .1U 6.2V 4.7K...
  • Page 57 Delete FB1, C20; FB2, C25 ; 6/16 change FB3,FB4,FB5 from 0805 to 0603 C 17 3.3V_MCU R 3 .3DVCC 18P J R 3 .3DVCC R 2 .5DVCC 24.576MHZ C 18 F B4 220 OHM C 35 C 36 C 37 C 38 C 39 C 40...
  • Page 58 delete RN4,RN5,RN6,RN8; 3.3V_MCU Q1,R44,C49,R46,R47 3.3V_MCU I - KEY PW _SW RTD_SCSB KE Y_MENU PANEL_ON C 47 R 42 R 43 D-detect 0 .1U 4.7K 4.7K **C50 close to scaler, R43 close to MCU. 3.3V_MCU 3.3V_MCU SC L RESET SD A C 48 0.22U K R 68...
  • Page 59 5V_PANEL 100K ELM13401CA 22U 25V 0.1U G(1) PANEL_ON 2N3904 D(3) S(2) 0.1U OPEN 5V_PANEL TP41 TP42 TP43 TP44 TP45 RXEIN3+ TP46 RXEIN3- TP47 RXECKIN+ TP48 RXECLK- TP49 RXEIN2+ TP50 RXEIN2- TP51 RXEIN1+ TP52 RXEIN1- TP53 RXEIN0+ TP54 RXEIN0- TP55 RXOIN3+ TP56 RXOIN3- TP57...
  • Page 60 Optical Points HOLE-V8 HOLE-V8 HOLE-V8 Project Code Model Name OEM/ODM Model Name 99.L1C72.001 Q7T4 Title INTERFACE BOARD Size PCB P/N P C B R ev. Document Number R e v. <Size> 99.L1C72.000-C3-304-001 48.L1C01.S02 Thursday, July 29, 2004 D ate: Sheet Prepared By R eviewed By A pproved By...
  • Page 61 1. Add C20, C25, C49, C77, R35 P r o j e c t Code Mo d e l Nam e OE M/OD M Mo d e l Nam e 9 9 .L 1 C72.001 Q7T4 Title I N T E R FAC E B OAR D S ize P C B P /N P C B R e v.

  • Page 62: Trouble Shooting

    Q7T4-FP71G LCD Monitor Service Guide Trouble Shooting Q7T4 TROUBLE SHOOTING GUIDE No Display or display is unstable: Interface Board: No picture or picture unstable Power off Turn on power Does cable plugs in Check all of wire then turn on power connector? switch again.

  • Page 63: Button Function

    Q7T4-FP71G LCD Monitor Service Guide Trouble Shooting 2. BUTTON function: 2.1 Control Board OSD is not working Is control BD connecting? Plug control BD then retry Is bottom switch normally? Replace control BD then retry Replace Control BD Is OSD working?? Check Interface BD 3.
  • Page 64 Q7T4-FP71G LCD Monitor Service Guide Trouble Shooting Backlight didn't shine Replace Q761 IC801 PIN 9 IS 15V? LED shined? Plug CN701 again or PWM existed? 3.3V existed? IS I/F board connected? checking I/F BD (BLT_ADJ) Replace new fuse Plug CN601 again or...
  • Page 66 CSN TOP EPS Q7T4 47.L1C02.001 CABLE SIGNAL 15/15P CORE*1 1.5M 50.L9005.501 CD MANUAL Q7T4 53.L1C01.001 ASSY BASE ABS 5003A Q7T4 60.L1C04.001 * THIS PARTS LIST MAY BE SUBJECT TO CHANGE WITH PRIOR NOTICE BY CSD OF BENQ. Page : 1 / 1...

Table of Contents