BenQ Q7T4-FP71G Service Manual Download Page 39 | Manualshive

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Q7T4-FP71G LCD Monitor Service Guide

Circuit Operation Theory

10

Confidential

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. Q810 and Q811 be the buffer to rise the drive capability and the totem poles

circuit can improve a capable of driving for Q812.C813 decide the striking time delay.

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Summary of Contents for Q7T4-FP71G

Page 1: ...area press ENTER EXIT and then press SOFTPOWER 2 Check the settings to following values Contrast 50 Brightness 90 OSD time 20 Color Normal Language English Then turn off the monitor power 3 Turn on po...

Page 2: ...lready done 3 Measure color temperature by Minolta CA 110 or equivalent equipment 4 Check the color temperature Bluish Reddish Normal The color temperature specification as follows X 0 283 0 03 White...

Page 3: ...and confirm it to match with the C212 document definition F Command definition PC Host will send 0x7C IIC slave address and then following 4 bytes command I2C Send Command Byte1 Byte2 Byte3 Byte4 OK N...

Page 4: ...EEPROM OSD Timer AA 98 Data cksum Write EEPROM Volume AA 99 Data cksum Write EEPROM Gamma index AA 9A Data cksum For model with Gamma curve selection function Write OSD Transparency to EEPROM AA 9E Da...

Page 5: ...EPROM Off burn in mode CE XX XX cksum XX Non 1 value Store data to EEPROM Monitor is forced power saving CF 01 XX cksum Monitor wake up from power saving CF XX XX cksum XX Non 1 value User mode to fac...

Page 6: ...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 Return Code R Byte1 R Byte2 Checksum...

Page 7: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 7 Confidential 4 Wire Dressing and assembling concern Prepare 1 panel Assembly panel and main BKT...

Page 8: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 8 Confidential Add 4 screw between panel and main BKT...

Page 9: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 9 Confidential Add FFC...

Page 10: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 10 Confidential Add Tape...

Page 11: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 11 Confidential Assembly IF board and Power Board...

Page 12: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 12 Confidential Assembly PCB module and main BKT...

Page 13: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 13 Confidential Assembly IF board and FFC...

Page 14: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 14 Confidential Add one tape...

Page 15: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 15 Confidential Assembly lamp wire and Power Board...

Page 16: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 16 Confidential Add one screw...

Page 17: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 17 Confidential Add 5 screw...

Page 18: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 18 Confidential Assembly main shielding and main BKT...

Page 19: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 19 Confidential Add 2 screw...

Page 20: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 20 Confidential Assembly control board wire and IF board...

Page 21: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 21 Confidential...

Page 22: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 22 Confidential Add one tape...

Page 23: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 23 Confidential Assembly Bezel and Rear Cover...

Page 24: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 24 Confidential Add 4 screw...

Page 25: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 25 Confidential Add 1 screw...

Page 26: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 26 Confidential Assembly Base and Rear cover...

Page 27: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 27 Confidential Finished...

Page 28: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 28 Confidential...

Page 29: ...Q7T4 FP71G LCD Monitor Service Guide Alignment Procedure 29 Confidential...

Page 30: ...he adjustable items and get some information about this monitor and the best function is to offer users an easy method to set all adjustable items well just by pressing one key we called it Auto key w...

Page 31: ...on 1 DDC Display Data Channel function We use DDC IC to support DDC 2B function DDC data is stored in 24C04 EEPROM Those data related to LCD monitor specification PC can read them by SDA and SCL seria...

Page 32: ...of these keys 1 Power key to turn off power of monitor 2 Enter key to enter sub menus or select items 3 Up Plus key to select previous and to increase adjustment 4 Down Minus key to select next and t...

Page 33: ...ter 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 filte...

Page 34: ...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 R615 is current sense resistor to control o...

Page 35: ...he current set point falls below a given value The output power demand diminishes the IC automatically enters the so called skip cycle mode and provides excellent efficiency Fig 6 6 Feedback circuit P...

Page 36: ...he 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 to do nothing c LED It indicates the...

Page 37: ...nput Voltage 15V Input Current 2A max ON OFF Voltage 5V PWM Duty 5V 50KHz Output Requirement Max Output Current 7 5mA Min Output Current 3 3mA Lamp Working Voltage 660Vrms Open Lamp Voltage 1500Vrms F...

Page 38: ...vice Guide Circuit Operation Theory 9 Confidential 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...

Page 39: ...807 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 Q810 and Q811 be the buffer...

Page 40: ...e 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 The result causes the voltage of prim...

Page 41: ...del Name PCB P N PCB Rev OEM ODM Model Name 99 L1C72 000 C3 304 002 CTRL BOARD 1 1 ALLEN PC LEE DAVEN WU 48 L1C03 S02 S02 ANGEL HU Size Q7T4 99 L1C72 001 0 Thursday August 26 2004 NA LED use 06 3N5YG...

Page 42: ...o performance 7 3 2 Brightness Adjustable Range 7 3 3 Acoustical Noise 7 3 4 Environment 7 3 5 Transportation 7 3 6 Electrostatic Discharge Requirements 8 3 7 EMC 8 3 8 Reliability 8 3 9 Audio perform...

Page 43: ...Engineering Specification 2 Confidential Table of Contents 7 Pallet Shipment 12 7 1 Container Specification 12 7 2 Carton Specification 12 Product 12 Package 12 8 Certification 12 Appendix Physical D...

Page 44: ...Video interface with Scaling supported No Max resolution mode supported 1280 x 1024 75Hz Number of Display Colors supported 16 2M colors RGB 6 bits FRC data Contrast Ratio 450 1 typ Luminance 260 cd...

Page 45: ...l Spec 3 0 8 0mA rms CCFL Frequency 90 264VAC 40KHz 80KHz Panel Spec 40KHz 80KHz Power cord Color Black Length 1500 50 mm 2 2 Signal interface Item Condition Spec OK N A Remark 15 pin D Sub Color Blac...

Page 46: ...Ground 15 Ground 4 Floating 16 Hot Plug Detect 5 Floating 17 TMDS RX0 6 DDC Clock 18 TMDS RX0 7 DDC Data 19 TMDS Ground 8 Floating 20 Floating 9 TMDS RX1 21 Floating 10 TMDS RX1 22 TMDS Ground 11 TMD...

Page 47: ...VESA 640x480 37 50 N 75 00 N 31 5 1280x1024 VESA 800x600 37 88 P 60 32 P 40 00 1280x1024 VESA 800x600 48 08 P 72 19 P 50 00 1280x1024 VESA 800x600 46 86 P 75 00 P 49 50 1280x1024 VESA 832X624 49 72 N...

Page 48: ...Range Item Condition Spec OK N A Remark Brightness adjustable range At default contrast level saturate point Full white color pattern Max brightness value Min brightness value 100 cd 3 3 Acoustical N...

Page 49: ...rner 3 edges 6 faces 4 Shock Wooden package Non Operating Waveform half sine Faces 6 sides per orientation 3 shocks Duration 3ms Velocity accelerate 75g 3 6 Electrostatic Discharge Requirements Item C...

Page 50: ...D Panel Supplier AUO Panel type of Supplier M170EG01 V1 Screen Diagonal 432mm 17 0 Display area Unit mm 337 920 H x 270 336 V Physical Size Unit mm 358 5 H x 296 5 V x 17 0 D typ Weight Unit gram 1900...

Page 51: ...panel specification 5 User Controls 5 1 User s hardware control definition Item Condition Spec OK N A Remark Monitor Power button Enter button Right Inc button Left Dec button Exit Volume button I key...

Page 52: ...c OK N A Remark Bezel opening 339 84 x 272 24 mm Monitor without Stand L x W x H mm 323 75 378 60 5mm Monitor with Stand L x W x H mm 362 378 135 31 mm Carton Box outside L x W x H mm 456 L 423 W 114...

Page 53: ...ery Container 20 1080 Pallet A 90 Pallet A 12 Pallet B 72 Pallet B 12 40 2520 Pallet A 90 Pallet A 14 With pallet Pallet B 72 Pallet B 14 20 X X X X 40 X X Without pallet X X 7 2 Carton Specification...

Page 54: ...C22 2 No 60950 Nordic D N S F EN60950 FIMKO EN60950 CE Mark 73 23 EEC IEC60950 EN60950 CB EN60950 TUV GS EN60950 EK1 ITB 2000 2003 CCC China GOST EN60950 Safety SASO CE Mark 89 336 EEC FCC USA FCC Pa...

Page 55: ...Q7T4 FP71G LCD Monitor Service Guide Engineering Specification 14 Confidential Appendix Physical Dimension Front View and Side view Fig 1 Physical Dimension Front View and Side view...

Page 56: ...7P C C6 0 047U D N4 BAV99 1 3 2 D N10 BAV99 1 3 2 R 34 0 C1 0 01U D N3 BAV99 1 3 2 R 25 47 D6 6 2V 1 2 R4 75 TP7 C8 0 047U TP16 U2 AT24C02A A0 1 A1 2 A2 3 VSS 4 VCC 8 WP 7 SCL 6 SDA 5 R 13 4 7K TP9 R...

Page 57: ...GND 32 PLL_TEST1 6 PLL_TEST2 7 XO 1 XI 2 DPLL_VDD 4 DPLL_GND 3 APLL_VDD 5 APLL_GND 8 TCON 11 V 0 114 TCON 10 V 1 115 TCON 9 V 2 116 TCON 8 V 3 117 TCON 6 V 5 119 TCON 5 V 6 122 DDCSDA 47 DDCSCL2 126 D...

Page 58: ...60206 1 1 3 3 5 5 7 7 9 9 11 11 2 2 4 4 6 6 8 8 10 10 12 12 TP27 C 64 220P J C 60 0 1U R 50 10K C 67 100P 50V J C 53 0 1U L11 C 68 100P 50V J R 52 0 C 59 0 1U R 49 220 C 56 22U 25V 1 2 SOCKET P N 22 1...

Page 59: ...001 INTERFACE BOARD 4 6 ALLEN PC LEE DAVEN WU 48 L1C01 S02 S02 ANGEL HU Size Q7T4 99 L1C72 001 1 Thursday July 29 2004 NA G 1 S 2 D 3 TP47 Q5 2N3904 1 3 2 TP54 TP57 TP63 C74 0 1U TP55 TP48 TP64 TP56...

Page 60: ...repared By Model Name PCB P N PCB Rev OEM ODM Model Name 99 L1C72 000 C3 304 001 INTERFACE BOARD 5 6 ALLEN PC LEE DAVEN WU 48 L1C01 S02 S02 ANGEL HU Size Q7T4 99 L1C72 001 1 Thursday July 29 2004 NA O...

Page 61: ...f Project Code R eview ed By Ap proved By Prepared By Model Name PC B P N P C B R ev OEM OD M Model Name 99 L1C 72 000 C3 304 001 I N T ER FAC E BOAR D 6 6 ALLEN PC LEE D AVEN WU 48 L1C 01 S02 S02 AN...

Page 62: ...Yes Turn on power No Does cable plugs in No Check all of wire then turn on power connector switch again Yes Does power stable No Check Power BD Yes Is LED light green orange No Check control BD Yes I...

Page 63: ...D is not working Yes Is control BD connecting No Plug control BD then retry Yes Is bottom switch normally Yes Replace control BD then retry No Replace Control BD Is OSD working No Check Interface BD 3...

Page 64: ...1 again or checking I F BD Turn on level existed BLT_ON Insert them again Check CN801 CN802 was pluged properly Plug CN601 again or checking PW BD Replace IC801 Q805 Replace new fuse Replace new fuse...

Page 65: ......

Page 66: ...A03 U5 7 PCBA SPS BD MI QT74 EG01 55 L1C02 001 8 PCBA CTRL BD MI Q7T4 55 L1C03 001 9 LCDM 17 M170EG01 V 1 AUO 56 91L83 011 10 ASSY FC ABS 8020C Q7T4 60 L1C01 001 11 ASSY RC ABS 5003A Q7T4 60 L1C02 001...

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