Acer AL1721h Service Manual Download Page 16 | Manualshive

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Monitor Block Diagram

The LCD MONITOR will contain an main board, an inverter/power board, keypad board and internal
adapter which house the flat panel control logic, brightness control logic and DDC.
The Inverter board will drive the backlight of panel and the DC-DC conversion.
The Adapter will provides the 12V DC-power to inverter/power board.

Monitor Block Diagram

KEY BOARD

SPEAKER

SPEAKER

IDPC

LAMP

LCD PANEL

Analog in

LCD Controller

-Scaler
-OSD
-ADC

DC-DC

Flash rom

Adapter (12V)

Digital in

POWER(90V-264)

Audio IC

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Summary of Contents for AL1721h

Page 1: ...Acer AL1721h Service Guide Service guide files and updates are available on the CSD web for more information please refer to http csd acer com tw ...

Page 2: ...ect to the contents hereof and specifically disclaims any warranties of merchantability or fitness for any particular purpose Any Acer Incorporated software described in this manual is sold or licensed as is Should the programs prove defective following their purchase the buyer and not Acer Incorporated its distributor or its dealer assumes the entire cost of all necessary servicing repair and any...

Page 3: ... bits and pieces of additional information related to the current topic WARNING Alerts you to any damage that might result from doing or not doing specific actions CAUTION Gives precautionary measures to avoid possible hardware or software problems IMPORTANT Reminds you to do specific actions relevant to the accomplishment of procedures ...

Page 4: ... NOT be covered in this generic service guide In such cases please contact your regional offices or the responsible personnel channel to provide you with further technical details 2 Please note WHEN ORDERING FRU PARTS that you should check the most up to date information available on your regional web or channel If for whatever reason a part number change is made it will not be noted in the printe...

Page 5: ...eiving antenna 2 Increase the separation between the equipment and receiver 3 Connect the equipment into an outlet on a circuit different from that to which the receiver is connected 4 Consult the dealer or an experienced radio TV technician for help Notice 1 The changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the e...

Page 6: ...any z The monitor is equipped with a three pronged grounded plug a plug with a third grounding pin This plug will fit only into a grounded power outlet as a safety feature If your outlet does not accommodate the three wire plug have an electrician install the correct outlet or use an adapter to ground the appliance safely Do not defeat the safety purpose of the grounded plug zUnplug the unit durin...

Page 7: ...ay find slightly uneven brightness on the screen depending on the desktop pattern you use The LCD screen has effective pixels of 99 99 or more It may include blemishes of 0 01 or less such as a missing pixel or a pixel lit all of the time Due to the nature of the LCD screen an afterimage of the previous screen may remain after switching the image when the same image is displayed for hours In this ...

Page 8: ...ar Bezel 24 Chapter 2 Operating Instructions 25 External Controls 25 Front Panel Controls 25 OSD Menu 27 Hot Key Menu 30 OSD Message 30 LOGO 31 Chapter 3 Machine Disassembly 32 Chapter 4 Troubleshooting 34 Chapter 5 Connector Information 40 Chapter 6 FRU Field Replacement Unit List 41 Exploded Diagram 41 Chapter 7 Schematic Diagram 44 Analog and Digital Input 44 GM5120 GM2120 45 LVD S 46 Key Board...

Page 9: ...16 2M Colors Dot Clock 165MHz 165MHz Max Resolution 1280 x 1024 75Hz 1280 x 1024 75Hz Plug Play VESA DDC1 2BTM VESA DDC1 2BTM ON Mode 45W 45W EPA ENERGY STAR OFF Mode 3W 3W D Sub 15pin Input Connector DVI D 24pin Input Video Signal Analog 0 7Vp p standard 75 OHM Positive Digital DVI D Analog 0 7Vp p standard 75 OHM Positive Digital DVI D Maximum Screen Size Horizontal 337 92mm Vertical 270 34mm Ho...

Page 10: ...arm Color Cool Color RGB Color temperature Reset OSD timeout information Exit Contrast Brightness Focus Clock H Position V Position Input Selected Language Dos mode resolution selected Warm Color Cool Color RGB Color temperature Reset OSD timeout information Exit Power Consumption Maximum 45 Watts 45 Watts Audio Output Rated Power 1W rms Per channel Rated Power 1W rms Per channel Regulatory Compli...

Page 11: ...htness control Maximum unless otherwise specified User contrast control Typical unless otherwise specified User red white balance Green white balance and Blue white balance control In the center unless otherwise specified Power input 90Vac or 240Vac Ambient temperature 20 5 C Analog input mode 1280 x1024 75 Hz Measurement systems The units of measure stated in this document are listed below 1 gamm...

Page 12: ...uniformity 80 typical Pc interface 1 Video RGB analog 0 7V peak to peak Sync TTL positive or negative Signal connector 15 pin Mini D type standard VGA video 3 5 mm stereo audio jack Audio For AR577 only Audio power 1 5Wrms 0 5Wrms 300Hz 1 3kHz Front control power on off with LED select adjustment Interface frequency Horizontal Frequency 30KHz 80KHz Vertical Frequency 55Hz 75Hz Plug play Support VE...

Page 13: ... 4 Response Time at Ta Falling TF 12 16 total msec Luminance of white Center of screen YL 200 260 cd mm RX 0 61 0 64 0 67 Red RY 0 31 0 34 0 37 GX 0 26 0 29 0 32 Green GY 0 58 0 61 0 64 BX 0 11 0 14 0 17 Blue BY 0 04 0 07 0 10 WX 0 28 0 31 0 34 Color Chromaticity CIE White WY θ 0 φ 0 Normal Viewing Angle 0 30 0 33 0 36 θL 80 Hori θR 80 φH 70 Viewing Angle Vert φL CR 10 70 Degrees Brightness Unifor...

Page 14: ... frequency range is generalized by supported timing If the entered mode does not match the supported timing the display optimization will not be assured ٛ Horizontal Frequency 30KHz 80KHz ٛ Vertical Frequency 55Hz 75Hz Panel bright dot defect and dark dot defect Test conditions ٛ 1280 1024 64KHz 60Hz ٛ R G B Full White and Full Black Pattern ٛ RECALL 1 Bright Dots R G or B dots 3dots G dots 3dots ...

Page 15: ...48 4 60 0 1344 806 136 24 160 60 0 56 5 70 1 1328 806 136 24 144 70 0 1024x768 XGA 60 75 1312 800 96 16 176 75 0 63 98 60 02 1688 1066 112 48 248 108 1280x1024 SXGA 79 98 75 03 1688 1066 144 16 248 135 Factory Preset Timing Table STANDARD RESOLUTION HORIZONTAL FREQUENCY kHz VERTICAL FREQUENCY Hz 720 x 400 31 47 70 0 640 480 31 47 60 0 640 480 35 00 66 6 640 480 37 50 75 0 VGA 640 480 37 861 72 8 8...

Page 16: ...trol logic brightness control logic and DDC The Inverter board will drive the backlight of panel and the DC DC conversion The Adapter will provides the 12V DC power to inverter power board Monitor Block Diagram KEY BOARD SPEAKER SPEAKER IDPC LAMP LCD PANEL Analog in LCD Controller Scaler OSD ADC DC DC Flash rom Adapter 12V Digital in POWER 90V 264 Audio IC ...

Page 17: ... KEY Control AT24C16 U602 EPR SDA SCL Panel PA 0 9 PB 0 9 VLCD U203 GM5120 HS VS VAA3 VCC2 5V VCC3 3V VAA1 VAA4 VAA2 AT24C02 DDC U104 DDC SCL SDA VGA Input VGA R G B VGA Hsync Vsync MAIN BOARD DIAGRAM AT24C02 DDC U102 DVI Signal ...

Page 18: ...to standby mode after the message disappear Program the scalar to be able to show the coming mode N Read the keyboard Is the power key pressed Process the OSD display N Y N Y Are the AUTO and SELECT keys pressed N Enter factory mode Y Save the power key status into eeprom Turn on the LED and set it to green color Scaler initialize Get the PWM value of brightness from eeprom MCU initialize Is the e...

Page 19: ...18 Monitor Board Layout ...

Page 20: ...CD U202 A290011TL 70 U203 SCALER IC gm5120 V BD U204 M24C16 MN6T U301 THC63LVDM83R U302 THC63LVDM83R U501 AIC1117 33CY U502 AIC1117 33CY U503 RT9164 25CL CN101 DVID CONN 24P FEMALE CN102 D USB 15PIN CN301 PIN HEADER 24P 2 0mm CN402 PIN HEADER FEMALE 2 6 CN403 WAFER 14P RIGHT ANGLE X201 CRYSTAL 14 318MHzHC 49U M2 PHONE JACK ...

Page 21: ...ation Top and Bottom Left and Right Back cover Bezel concavity Back cover Bezel concavity 0 8mm A 1 3 mm 0 8mm A 1 3 mm Back Cover Hinge Cover concavity 0mm B 0 5mm Base Neck concavity 0mm C 0 6mm Top and Bottom Left and Right Back cover Bezel step Back cover Bezel step B ...

Page 22: ...CD Horizontally The angle between front bezel and LCD unit in bottom side should not large than 1 0mm The distance of the LCD display unit from left side to right should not large than 4 0mm Tilt Base Rotation Tilt up 15 2 down 5 2 ...

Page 23: ...ic Material For TCO99 Front Bezel ABS 94HB Back Cover ABS 94HB The Others ABS 94HB For MPRII Front Bezel ABS 94HB Back Cover ABS 94HB The Others ABS 94HB GAP Spec Gap between panel with bezel is 0 mm gap 1 2 mm ...

Page 24: ...23 Front Bezel Item Description 1 VEDIO UP 2 VEDIO DOWM 3 POWER 4 MENU ENTER 5 AUTO EXIT ...

Page 25: ...24 Rear Bezel Item Description 1 D SUB Cable 2 DC Jack Power Cable 3 AC POWER CORD 4 EXTERNAL ADAPTER 5 DVI CABLE 6 AUDIO CABLE ...

Page 26: ...Adjust Key Exit 3 Power Key LED Front Panel Control Power Button Press this button to turn the monitor ON or OFF Menu Enter Activate OSD menu when OSD is OFF or activate de activate adjustment function when OSD is ON or Exit OSD menu when in Volume Adjust OSD status Volume Activates the volume control when the OSD is OFF or navigate through adjustment icons when OSD is ON or adjust a function when...

Page 27: ...rotection repackage your monitor as it was originally packed at the factory To keep the monitor looking new periodically clean it with a soft cloth Stubborn stains may be removed with a cloth lightly dampened with a mild detergent solution Never use strong solvents such as thinner benzene or abrasive cleaners since these will damage the cabinet As a safety precaution always unplug the monitor befo...

Page 28: ...27 Adjusting The Picture 1 Main OSD Menu a Outline I Analog Only Model II Dual Input Model Analog Signal Input III Dual Input Model Digital Signal Input ...

Page 29: ...er Green Green Gain Digital register 0 100 User Blue Blue Gain from Digital register 0 100 The Color Temperature will be set to Cool The User R G B value default is 100 will not be Modified by Reset function English N A Set OSD display language to English N A 繁體中文 N A Set OSD display language to Tranditional Chinese N A Deutsch N A Set OSD display language to German N A Français N A Set OSD displa...

Page 30: ...Digital N A Select input signal from digital DVI N A N A Information N A Show the resolution H V frequency and input port of current iput timing N A N A Reset N A Clear each old status of Auto configuration and set the color temperature to Cool N A N A Exit N A Exit OSD N A N A ...

Page 31: ... Digital signal input without this OSD Message Input Not Supported When the Hsync Frequency Vsync Frequency or Resolution is out of the monitor support range will show this message This message will be flying Cable Not Connected 1 Analog Only Model When the video cable is not connected will show this message This message will be flying 2 Dual Input Model Dual Input Model without this OSD Message N...

Page 32: ...K This feature is designed to conserve electrical energy by reducing power consumption when there is no video input signal present When there is no video input signal this monitor following a time out period will automatically switch to an OFF mode This reduces the monitor s internal power supply consumption After the video input signal is restored full power is restored and the display is automat...

Page 33: ... harness 3 Stick the soft cushion EMI 4 To fix the wiring harness with the adhesive plaster 5 To put the bezel on panel 6 To fix the main frame and panel with the screws 7 To connect the main board with inverter board 8 To connect all the interfaces of above board 9 After having fix the board cover the shield on them 10 To fix the shield on the main frame with screws 11 To put and fix the rear cov...

Page 34: ...he corresponding components to avoid mismatch when putting back the components 2 Note The monitor surface is susceptible to scratching Therefore lay the monitor on a soft surface when mounting or removing the base 3 Wear gloves Warning 1 In order to prevent the static disturbance wear resisting static ring 2 No watch ...

Page 35: ... the screen show Cable Not Connected the Signal cable again Check LED status Led Green Replace U202 Flash Rom No nothing is show Connected the Signal cable again Check LED status Check Power switch is in Power on status and check if Power switch had been stuck Led Orange OK Keyboard no stuck Led orange Check the Wire Harness from CN301 Measured RGB R136 R138 R140 H V Input at U106 pin 4 10 was the...

Page 36: ...he U203 GM5120 2120 OK R308 have response NG no Voltage Measured the Q302 pin 5 6 7 8 5 V Check U202 pin 1 2 3 4 5V OK OK Replace Q302 Nmos SI9933 NG Check the Bklt On relative circuit R409 In normal operation when LED green R409 Bklt On should 5 v If Bklt On no response when the power switch turn on off Replace U203 GM5120 NG still no screen Replace Power board to new one and Check the screen is ...

Page 37: ...t signal 640x480 60 Hz 31k and LED is Green NG no transition OK Replace GM5120 U203 or replace MAINBOARD Check U203 gm2120 Signal output ER0 7 EG0 7 EB0 7 OR0 7 OG0 7 OB0 7 Is the waveform ok If MainBoard being replace please do the DDC content Replace U301 U302 LVDS IC or replace MAINBOARD OK OK Check U301 U302 LVDS IC Signal output Is the waveform ok ...

Page 38: ...hange F901 check BD901 Q903 IC901 Check the voltage of C905 Check bridge rectified circuit cFailure NG OK Check start voltage for the pin3 of IC901 Change IC901 NG Repeating the start voltage Check the auxiliary voltage is smaller than 20V 1 Check IC902 IC903 2 Check Q901 Q902 OVP circuit NG OK Check R919 D910 D911 D912 D913 ZD904 OK ...

Page 39: ...C905 NG OK Change Q201 or Q202 Check the pin1 of U201 have sawtooth wave NG Change U201 Check D201 D202 have the output of square wave at short time NG OK Check Q205 Q207 Q203 D201 or Q206 Q208 Q204 D202 Check the resonant wave of pin2 pin5 for PT201 PT202 NG OK Check the output of PT201 PT202 Check Q209 Q210 C213 or Q211 Q212 C214 Check connecter lamp OK NG Change PT201or PT202 OK ...

Page 40: ...d Board OSD is unstable or not working Is KeyPad Board connecting Connect KeyPad Board Is Button Switch normally Replace Button Switch Y N N Is KeyPad Board Normally Replace KeyPad Board Y N Y Check Main Board ...

Page 41: ...nc 7 G Ground 15 DDC Serial Clock 8 B Ground 24 Pin Color Display Signal Cable DVI Pin Meaning Pin Meaning 1 TMDS Data2 13 not connected 2 TMDS Data2 14 5V Power 3 TMDS Data 2 4 Shield 15 Ground 4 not connected 16 Hot Plug Detect 5 not connected 17 TMDS Data0 6 DDC Clock 18 TMDS Data0 7 DDC Data 19 TMDS Data 0 5 Shield 8 Analogue Vertical Sync 20 not connected 9 TMDS Data1 21 not connected 10 TMDS...

Page 42: ...l Acer office on how to return it Exploded Diagram NO PANT NO PANT NAME 2 3 17 18 19 20 5L6013 LIFT_RUBBER 33L4697 LIFT_COVER 33L4699 STAND_COVER 19L573 SPRING 33L4635 LENS_FUNCTION 33L4634 BUTTON_FUNC 15L5919 1 MAIN_FRAME 85L640 1 MAIN_SHIELD 15L5791 1 BKT_VESA 34L1188 REAR_COVER M1L11306128 M3 6 1 1 1 1 1 1 1 1 1 1 8 2 M1L174012120 M4 12 M1L3304128 M3 4 2 1 15 12 16 M3 6 4PCS M3 6 8PCS 16 BEZEL ...

Page 43: ...e Description Part No 1 VESA COVER 33L4700 GD L 33L4701 GD L 2 Stand 34L1279 GD L 3 SCREW M1L 330 6120 4 SCREW Q1L 130 6120 5 FOOT PORON 12L 394 3 6 VESA BRACKET 15L5791 1 7 BASE PLATE 15L5981 1 8 HINGE 37L 491 1 9 SHIELD 85L 641 1 10 MAIN FRAME 15L5921 1 11 LIFT COVER 33L4697 GD L ...

Page 44: ...43 Item Picture Description Part No 12 REAR COVER 34L1188AGD 2B 13 LIFT HOLDER 33L4696 GD L 14 SPRING HOLDER 33L4698 GD X 15 STAND LIFT 34L1280 GD B ...

Page 45: ...3 BAV99 3 1 2 C108 0 01uF 16V V Sync Rin 3 3V NEW ADD CIRCUIT GREEN DDC_SDA_A P 3 GPIO5 UART_DO RX1 3 DIGITAL USE C103 1uF 16V GPIO5 UART_DO FB102 51 1 16W C116 NC D114 BAV99 3 1 2 C121 0 1uF 16V RX1 3 H Sync R138 NC GND D103 BAV99 C113 0 01uF 16V GND R101 10K 1 16W R106 100 1 16W GND RX2 IN D108 BAV99 3 1 2 D104 BAV99 R133 NC C120 0 1uF 16V C106 10pF CN102 DB15 1 6 2 7 3 8 4 9 5 11 12 13 14 15 10...

Page 46: ...X1 GND_RX0 VSS_DPLL VSS_SDDS VSS_DDDS N C ADC_TEST PD6 ER6 PD7 ER7 PD10 EG2 PD11 EG3 PD12 EG4 PD13 EG5 PD14 EG6 PD15 EG7 PD33 OG1 PD32 OG0 PD18 EB2 PD19 EB3 PD20 EB4 PD21 EB5 PD22 EB6 PD23 EB7 PD17 EB1 PD16 EB0 PD26 OR2 PD27 OR3 PD28 OR4 PD29 OR5 PD30 OR6 PD31 OR7 PD25 OR1 PD24 OR0 PD34 OG2 PD35 OG3 PD36 OG4 PD37 OG5 PD38 OG6 PD39 OG7 PD9 EG1 PD8 EG0 PD42 OB2 PD43 OB3 PD44 OB4 PD45 OB5 PD46 OB6 PD...

Page 47: ... 1uF 16V R302 4 7K PVS PHS TX1 O OPR1 R310 47 C318 0 1uF 16V OPG1 TX2 O EPB0 C302 0 1uF 16V 5V EPB4 TX1 O GND C317 10uF 16V GND TX0 E EPR7 C314 0 1uF 16V OPG3 C301 0 1uF 16V CONNECTOR for PANEL TXCK E OPR6 GND OPR4 OPG4 C305 0 1uF 16V PPWR P 3 OPB6 P5V R303 10K 1 16W ACER GM5120 2120 TX3 O TX2 E TXCK O EPB3 TX2 E PDEN TX2 O LVDS_ON EPG2 U302 THC63LVDM83R 42 17 50 14 5 38 8 43 28 31 23 40 47 20 48 ...

Page 48: ...2 60 R431 NC C407 150pF 5V LED_ORG C422 68pF 5V C410 0 1uF 16V NEW ADD CIRCUIT FOR 4 LED 04 08 C417 NC 2003 02 21 GND R408 NC FB403 600 OHM Q403 NC 3 1 2 GND VOL 4LED MUTE LED_ORANGE P 4 FB405 600 OHM C411 150uF 25V NEW ADD CIRCUIT FOR 4 LED 04 08 GPIO6 P 4 MUTE_OUT LED_GRN R418 NC JP403 R421 0 LED_BLUE C406 NC GND 3 3V BackLight On Off C412 0 1uF 16V R401 0 1 16W R407 NC GPIO7 P 4 R426 NC C413 22...

Page 49: ...68PF C15 100pF R9 2 7K 1 16W OUT L P4 5 R1 NC C8 470uF 16V C21 1uF 16V R10 10K 1 16W R14 100 1 16W D2 MLL4148 D1 NC C11 0 1 16W 2003 02 21 EMI SOULATION NEW C17 C20 68PF 1 C14 100pF C6 0 1 16W R3 5 1K 1 16W C7 0 47uF 16V R6 1K 1 16W ACER GM2120 R11 10K 1 16W 2 AUDIO_SD C16 0 1uF 16V C12 150uF 25V M2 PHONEJACK EMI SOULATION NEW C17 C20 68PF VOL 3 C9 0 47uF 16V U1 TDA7496L 1 2 3 4 5 6 7 8 9 10 11 12...

Page 50: ...0 A 7 7 Monday May 12 2003 Title Size Document Number Rev Date Sheet of SOT 223 U502 3 2 1 VI VO GND C508 47uF 16V GND C528 0 01uF C514 47uF 16V FB503 600OHM C525 0 01uF D2 5V C504 47uF 16V D3 3V SOT 223 C515 0 1uF 16V U503 RT9164 1 2 3 ADJ VOUT VIN C505 0 1uF 16V A3 3V C512 0 1uF 16V U501 3 2 1 VI VO GND 715L1123 A TO 252 3 3V C519 0 01uF GND C524 0 1uF 16V C513 0 01uF C527 0 1uF 16V FB502 600OHM...

Page 51: ... can download information on all of Acer s Notebook Desktop Server models including Service guides User s manuals Training materials Bios updates Spare parts lists TABs Technical Announcement Bulletin For these purposes we have included an Acrobat File to facilitate the problem free downloading of technical material Also contained on this website are Detailed information on Acer s International Tr...

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