BenQ G2420HD Product Service Manual Download Page 64

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#6 Feedback circuit

PC123 is a photo-coupler and KA431 is a shunt regulation. They are used to detect the

output voltage change and be the primary and secondary isolation. When output voltage
changes, the feedback voltage will be compared and duty cycle will be decided to control the
correct output voltage. (See Fig.7)

R707
10K

R709

10K F

R712

3.32K F

R711

22K F

C709

0.1U K

PC123FY1J00F

IC602

R708

IC702

KA431AZT A_NL

Fig. 7

#7 DC-DC circuit

IC851(PWM IC TL1451) is used to convert V-INVERTER to other voltage needed.

R858
330K

L853

Z45/100MHZ

Q857-B

L851

47U

L852

47U

R855

47K

R873

47K

R861

2.7K J

R862

2.7K J

R875

1K F

Q855

PMBS3904

Q853

PMBS3904

R851

10K F

R857

10K F

R853

10K F

R859

10K F

R854

10K F

V-INVERTER

Q854

2N3906S

Q856

2N3906S

PANEL_5V

MCU_3.3V

C869

0.1U

C864

0.1U

F851

32V 2A

IC851

TL1451ACN

1OU

Q851

2SJ598

Q852

2SJ598

C858

0.01U K

C855

0.01U K

R866

R882

C852

0.1U K

R865

22K

R872

22K

C863

470P K

C851

470P K

C868

470P K

R863

330

R864

3.3K

R871

3.3K

C857

220P K

FD852

ERB83-004

C854

220P K

FD853

ERB83-004

R856
330K

C853

1U K

C856
1U K

C859

1U K

R874

3.09K F

FD851
SB360-LF

Q857

2N3906S

R852
2.7K

C860
0.1U

Q855-C

R860

22K

AUDIO_CTRL

IC851-14

IC851-10

IC851-3

IC851-7

C862
220U 25V

Q855-E

Q853-C

C865
220U 25V

Q853-B

C867
220U 25V

C871
220U 25V

R877

1.2K F

R876

2.05K F

Summary of Contents for G2420HD

Page 1: ...2009 05 26 Notice For RO to input specific Legal Requirement in specific NS regarding to responsibility and liability statements Please check BenQ s eSupport web site http esupport benq com to ensure...

Page 2: ...tance 19 4 Level 1 Cosmetic Appearance Alignment Service 25 4 1 Software Firmware Upgrade Process 25 4 2 Alignment procedure for function adjustment 31 5 Level 2 Disassembly Assembly Circuit Board and...

Page 3: ...m diagnostics tests troubleshoot problems and align the BenQ product 1 1 Trademark The following terms are trademarks of BenQ Corporation BenQ Importance Only trained service personnel who are familia...

Page 4: ...ersons are safe while you are servicing the product DO NOT perform any action that may cause a hazard to the customer or make the product unsafe 3 Use proper safety devices to ensure your personal saf...

Page 5: ...98 89 V Panel Display information Pixel Pitch 0 276 mm x 0 276 mm per one triad Viewing Angle Contrast Ratio 10 R L 85 85 degrees typ and U D 80 80 degrees typ Analog interface with Scaling supported...

Page 6: ...3 1 2 1 Power supply 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 49...

Page 7: ...arate H V sync Composite H V sync Positive Negative For 15 pin D sub Level Logic High 2 4V 5 5V Logic Low 0V 0 5V TTL level Refer to VESA VSIS Standard V1R1 Impedance Minimum 2 2K pull down 10K for ap...

Page 8: ...DS RX2 14 5V Power 3 TMDS 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...

Page 9: ...er overshoot undershoot 5 final full scale value Refer to VESA VSIS Standard V1R1 Overshoot Undershoot 12 of step function voltage level over the full voltage range Refer to VESA VSIS Standard V1R1 3...

Page 10: ...10 3 1 2 6 Support Timings...

Page 11: ...ed condition 240 cd m2 typ 300 min Test Condition Set contrast at 100 brightness at 100 color at User preset Response time Gray to Gray 2 ms typ Test Equipment Westar TRD 100 or equal level equipment...

Page 12: ...ng 0 40 Non operating 20 60 Humidity Operating 10 90 Non condensing Non operating 10 90 Non condensing Altitude Operating 0 3048m 10 000ft Without packing Non operating 0 12 192m 40 000ft With packing...

Page 13: ...ion 3ms Velocity accelerate 75g 3 1 3 6 Electrostatic Discharge Requirements Item Condition Spec OK NA Remark Electrostatic Discharge IEC801 2 standard Contact 8KV Air 15KV 3 1 3 7 EMC Item Condition...

Page 14: ...ea Unit mm 531 36 H x 298 89 V Physical Size Unit mm 556 H x323 2 V x 16 65 D Weight Unit gram 2860 typ Technology TN type Pixel pitch Unit mm 0 276 H x 0 276 W Typ Per one triad Pixel arrangement R G...

Page 15: ...OK NA Remark Power button Enter button Right Inc button Left Dec button Menu button Exit buttom Mode button Input Select button iKey button Mute button 3 1 5 2 OSD control function definition Item Con...

Page 16: ...48 42 63 26mm Monitor with Stand W x H x D mm 570 412 6 183 94mm Carton Box outside L x W x H mm 636 133 482 mm Tilt and Swivel range Tilt 3 5 21 5 degree Swivel 0 degree 3 1 6 2 Weight Item Condition...

Page 17: ...t Net Weight Kg Gross Weight Kg Dimension w o Base W H D mm Dimension w Base W H D mm 4 9Kg 6 5Kg 570 412 6 87 7mm 570 412 6 183 94mm Package Carton Interior Dimension mm L W H Carton External Dimensi...

Page 18: ...3 GOST EN60950 SASO IEC60950 EMC CE Mark 89 336 EEC FCC USA FCC Part 15 B EN55022 Class B CISPR 22 Class B VCCI Japan VCCI Class B BSMI Taiwan CNS 13438 C Tick Australia AS NZS CISPR22 X Ray Requireme...

Page 19: ...mining testing or otherwise comparing the product with a given set of specified technical esthetic and workmanship requirements leading to an evaluation of the degree of fitness for use including poss...

Page 20: ...ptance Quality Level When a critical defect is found this must be reported immediately upon detection the lot or batch shall be rejected and further shipments shall be held up pending instructions fro...

Page 21: ...stapled product will not arrive in good condition at customer Minor 1 3 Carton damaged 3cm to 6cm dia badly taped or stapled product will arrive in good condition at customer Minor 1 4 Wrong marking o...

Page 22: ...will not function correctly Major 3 21 Missing knob or switch not safe Critical 3 23 Missing knob or switch but safe Major 3 24 Poor functional user controls in mechanical Major 3 25 Unreadable printi...

Page 23: ...t pattern KEY PATTERN TEST ITEM A FULL WHITE H Size V Size Viewing Angle Light Output Impurity Spot check Contrast Ratio Brightness adjust Range E DARK Background Spot check F FULL W R G B Impurity Sp...

Page 24: ...4 PANEL INSPECTION CRITERIA Note This Panel Specification is subject to change Please check it on eSupport system for latest update Inspection Item Specification Line defect Can t be seen Bright Dot 2...

Page 25: ...Board b I2C Board 2 DSUB VGA cables x 2 3 Printer cable with one male connector and another female connector x 1 4 PC or Notebook with parallel printer port x1 Check the Jumpers on the I2C circuit bo...

Page 26: ...26 4 1 2 Software prepare 1 Realtek exe Step 1 Press RTD Tool Step 2 Choose IIC Serial Flash and 0x94 Then press ISP 1 2 Link I2C BD Power cable and Signal cable...

Page 27: ...k the Bank and Find the F W 1 xxx H00 2 xxx H01 3 xxx H02 4 xxxEXT Hex Step4 Choose P Flash and Auto Step5 Press to run the program Step6 Check result If the words showed in red need to run the progra...

Page 28: ...28 4 1 3 EDID Upgrade Procedure Step 1 Run the program Q EDID V016 exe when the UI popped up Note If VGA choose 128bytes and HDMI choose 256bytes...

Page 29: ...29 Step 2 Click Open File and select VGA or HDMI EDID file Step 3 If load file is successful it shows Open EDID Table OK And then Click Write EDID button to update EDID...

Page 30: ...30 Step 4 If write EDID is successful it shows Write EDID OK And then click Read EDID button to check if successful or not Step 5 If read EDID is successful it shows Read EDID OK...

Page 31: ...ings to following values Contrast 50 Brightness 90 Color User Mode Senseye mode Standard Language English Burn In ON Then turn off the monitor power 3 Turn on power enter user area C Color balance adj...

Page 32: ...th General pattern No Mode H V 1 720 400 70Hz 31 468 70 8 2 640 480 60Hz 31 469 59 940 3 640 480 75Hz 37 500 75 000 4 800 600 60Hz 37 879 60 317 5 800 600 75Hz 46 875 75 000 6 1024 768 60Hz 48 363 60...

Page 33: ...su m Base on current color index to read back the right gain value Read Green Gain from MCU RAM by color index C3 58 XX cksu m Read Blue Gain from MCU RAM by color index C3 59 XX cksu m Write C1 Bluis...

Page 34: ...ksu m Also Update MCU RAM 1 English 3 French 0 Deutsch 4 Italian 2 Spanish 5 JAPAN 6 7 8 Hungarian 9 Serbian 0A Russian 0B Dutch 0C Polish 0D Czech 0E Swedish 0F Portugese 10 Romanian Write EEPROM OSD...

Page 35: ...Gain data from EEPROM A3 7E XX cksu m Read Contrast from EEPROM A3 92 XX cksu m Read Brightness from EEPROM A3 93 XX cksu m Read C T index from EEPROM A3 94 XX cksu m 1 C1 9300 Bluish 2 C2 6500 sRGB...

Page 36: ...cksu m Monitor wake up from power saving CF XX XX cksu m XX Non 1 value Change Sense Eye mode to Standard C0 00 XX cksu m Change Sense Eye mode immediately And store the index to EEPROM Change Sense E...

Page 37: ...r Offset1 Offset2 Gain 1B 5A XX cksu m Copy EDID Serial number to EEPROM 1C 5A XX cksu m For specified Industry Customer model Factory mode to User mode 1E 5A XX cksu m Clear user mode and factory rec...

Page 38: ...EEPROM Bank 3 B3 Addr ess XX cksu m For 24C08 type Write EEPROM Bank 0 B8 Addr ess Data cksu m Write EEPROM Bank 1 B9 Addr ess Data cksu m Write EEPROM Bank 2 BA Addr ess Data cksu m For 24C08 type Wr...

Page 39: ...39 1 2 5 3 13 9 14 15 16 17 21 22 23 19 20 12 18 5 4 10 11 6 7 8 5 Level 2 Disassembly Assembly Circuit Board and Standard Parts Replacement 5 1 Exploded View...

Page 40: ...40 This Service BOM is subject to change Please check it on eSupport and SPO system before service parts order release 5E 0BJ06 001 5E 0RM03 001 5E 0RM01 011 5E 0RM02 001 5F LUDB0 051...

Page 41: ...4 Prepare the implement equipments material as bellow 1 Press fixture 2 working table 3 Screw driver 4 knife 1 5 glove 6 cleaning cloth 7 ESD protection ite m picture Operation Tool Notes 1 Disassemb...

Page 42: ...he Rear cover from the monitor if it have earphone function pull the earphone wire out of the connector 4 Pull the c b wire out of the c b connector Tear off the C B wire from panel move away C B and...

Page 43: ...43 6 Tear off the two acetic tapes if it have that Pull out the light wires from connector 7 Disassemble the SHD 8 Tear off all the tapes sticked on the BKT including aluminum foils and acetic tapes...

Page 44: ...ow tape on the LVDS FFC and pull LVDS FFC out off the panel 10 Disassemble the hexangular screws four or two 10 Turn over the BKT and disassemble the power board and I F board 7 screws Screw driver 11...

Page 45: ...bellow 1 Press fixture 2 working table 3 Screw driver 4 knife 1 5 glove 6 cleaning cloth 7 ESD protection ite m picture Operation Tool Notes 1 Put panel on the cushion carefully 2 Fetch I F board and...

Page 46: ...crew Screw driver 7 1kg 5 Turn over the bkt and lock the hexangular screws four or two Screw driver 5 0 6kg Lock one HDMI screw if it have that Screw driver Side mount 3 0 6 Other 4 0 6 6 Lock SHD on...

Page 47: ...tool location the bkt on panel location tool G24101 10 Stick tapes follow standard One tape stick on angel side one on right side one on ground side Stick acetic tapes on left 11 Insert light wires an...

Page 48: ...and put button in bezel Tear the tapes on the back of c b wire insert c b connector in I F stick c b on panel 15 Fetch cover cover the monitor if it have ear phone function assay earphone board on co...

Page 49: ...eft put hinge in front cover and lock four screws then cover the back cover last put the clip in front cover Screw driver 7 5 0 5kg 17 Put stand in monitor and lock two screws Screw driver 9 0 1 0kg 1...

Page 50: ...Tooling A B C BenQ G900HD 56 69mm 40mm 40mm BenQ G2220HD 84mm 44 5mm 44 5mm BenQ G2020HD 69mm 42mm 42mm BenQ G2410HD AUO 78 65mm 57 2mm 57 2mm BenQ G2410HD CMO 72 65mm 55 85mm 55 85mm BenQ T2200 56 69...

Page 51: ...51 5 4 Packing...

Page 52: ...o control the adjustable items and get some information about this monitor The best function is to offer users an easy method to do DDC CI Enable and Auto Adjustment items well done just by pressing h...

Page 53: ...power board normal Turn on power Y N Plug the cable then turn on power again Check Power BD 5V output Y N N Y Is Power LED light Green or amber Check Key BD and Key BD cable N Y Is Power LED status no...

Page 54: ...g Is control BD connecting Is bottom key normally Check Interface BD Plug control BD then retry Replace control BD then retry Replace Control BD Is OSD working Yes No Yes Yes No No OSD doesn t work Is...

Page 55: ...BD No Check L852 Q852 FD852 FD853 Q855 Q856 L851 Q851 FD851 Q853 Q854 OK No Replace components IC Check IC851 Vcc valid Yes Replace IC851 components No No Check F851 OK Replace F851 No Yes AC DC conve...

Page 56: ...56 5 6 4 2 AC DC converter...

Page 57: ...eck V INVERTER OK AC DC converter No Yes Check IC801 VDDA OK DC DC converter No Check BL_ON BRT_ADJ OK Yes Check wires I F BD No Check IC801 frequency output OK Yes Replace IC801 components No Check T...

Page 58: ...58 5 7 Circuit Operation Theory A 1 Interface board diagram A 2 Circuit operation theory a Monitor Diagram...

Page 59: ...r Scaling OSD and LVDS transmitter functions built in the RTD2482D IC Scaling IC is revolutionary scaling and color engine capable of expanding any source resolution to a highly uniform and sharp imag...

Page 60: ...EMI Filter This circuit fig 2 is designed to inhibit electrical and magnetic interference for meeting FCC VDE VCCI standard requirements L4 N3 L602 19MH 1 2 4 3 C601 0 22U M t TR601 NTC 5 2 1 C603 22...

Page 61: ...ower 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 C614 R607 C607 and D601 are snubb...

Page 62: ...re used to produce DC output See Fig 5 V INVERTER 2 T601 1 3 12 5 8 11 6 4 10 D701 YG862C15RSC A1 J A2 D702 YG862C15RSC A1 J A2 C705 1000P K C704 1000P K R701 100 R702 100 C701 470U 35V RC1820 1 2 C70...

Page 63: ...control The TEA1530 A T enables highly efficient and reliable supplies to be designed easily D605 LL4148 A K C605 Spec 150U 450V 1 2 R616 68K 90V W Protection E6 L603 Z45 100MHZ 264V W Protection C611...

Page 64: ...PMBS3904 B E C Q853 PMBS3904 B E C R851 10K F R857 10K F R853 10K F R859 10K F R854 10K F V INVERTER Q854 2N3906S C E B Q856 2N3906S C E B PANEL_5V MCU_3 3V C869 0 1U C864 0 1U F851 32V 2A IC851 TL145...

Page 65: ...854 C855 C857 C858 R855 and R873 are used for gain phase compensation R855 47K R873 47K R851 10K F R859 10K F R857 10K F R853 10K F R854 10K F IC851 TL1451ACN CT 1 RT 2 1IN 3 1IN 4 1FBK 5 1DTC 6 1OUT...

Page 66: ...C867 220U 25V 1 2 C871 220U 25V 1 2 V INVERTER F851 32V 2A 8 Inverter Circuit Operation Theory LCDM Inverter Controller OZ9933 OZ9933 is a high performance cost effective CCFL controller designed for...

Page 67: ...guration The full bridge switch is configured such that Q801 N MOS and Q8026 P MOS are ON while Q801 P MOS and Q802 N MOS are OFF in a half cycle During the next half cycle Q801 N MOS and Q802 P MOS a...

Page 68: ...K F R821 100K C822 470P J C821 5PF D C815 100P J C816 100P J CN801 2K62272102 1 1 2 2 CN802 2K62272102 1 1 2 2 D809 LL4148 A K R816 2 2K R815 2 2K R827 365 F C814 0 033U K D805 BAV99 A J K Fig 2 Fig 2...

Page 69: ...al to metal Plastic to metal 9 0 1 0 M4 0 7 2 5 6K L8810 001 ASSY SCREW M4 8L FP726A NLK ISU 8F 5A456 8R0 4B L7212 0 01 Metal Metal to metal Plastic to metal 9 0 1 0 M4 0 7 2 6 8F 00273 6R0 SCRW TAP P...

Page 70: ...l Plastic to metal 5 0 1 0 2 35 0 0 5 2 15 8F XA324 5R0 SCRW TAP M3 5L B ZB Metal Metal to Plastic 6 8 2 85 2 95 2 16 8F 1A526 5R0 SCRW MACH PAN M4 5L NI Metal Metal to metal Plastic to metal 8 10 M4...

Page 71: ...tic Metal to plastic Plastic to plastic 4 5 0 5 2 35 0 0 5 2 27 8F 00607 8R0 SCRW TAP FPH M3 8L 5 0 8 B ZN Plastic Metal to plastic Plastic to plastic PCB to plastic 4 0 0 5 2 68 0 0 3 2 28 8F 5A322 2...

Page 72: ...72 Appendix 2 Physical Dimension Front View and Side view Fig 1 Physical Dimension Front View and Side view...

Page 73: ...73 Fig 2 Appearance Description...

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