AOC Wipro WLA171t Service Manual
AOC Wipro WLA171t Service Manual

AOC Wipro WLA171t Service Manual

17” lcd color monitor

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17" LCD Color Monitor
Service
Service
Service
Description
Table Of Contents..........................................................1
Revision List.............................................................2
Important Safety Notice.............................................3
1. Monitor Specification...............................................4
2. LCD Monitor Description........................................5
3. Operation Instruction............................................6
3.1 General Instructions.........................................6
3.2 Control Button......................................................6
3.3 Adjusting the Picture..........................................8
4. Input/Output Specification.......................................11
4.1 Input Signal Connector.........................................11
N
4.2 Factory Preset Display Modes.........................11
4.3 Panel Specification.........................................12
5. Block Diagram.....................................................14
5.1 Software Flow Chart.........................................14
5.2 Electrical Block Diagram...................................16
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

TABLE OF CONTENTS

Page
Description
6.Schematic......................................................18
6.1 Main Board..........................................................18
6.2 Power Board.....................................................24
6.3 Audio Board....................................................26
7.PCB Layout...........................................................27
7.1 Main Board........................................................27
7.2 Power Board...............................................29
7.3 Audio Board.......................................................31
7.4 Key Board.........................................................31
8.Maintainability..............................................32
8.2 Trouble Shooting..............................................33
10. Monitor Exploded View.....................................40
11. BOM List..............................................................42
SAFETY NOTICE
1
Wipro WLA171t
Horizontal Frequency
30kHz - 80kHz
Page

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Summary of Contents for AOC Wipro WLA171t

  • Page 1: Table Of Contents

    17” LCD Color Monitor Wipro WLA171t Service Service Service Horizontal Frequency 30kHz – 80kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents..……..……......…..1 6.Schematic……………........…18 Revision List.….....……......……..2 6.1 Main Board.……...……..........18 Important Safety Notice.…………....……..3 6.2 Power Board..………..……........24 1. Monitor Specification......………..4 6.3 Audio Board..………..…….........26 2.
  • Page 2: Revision List

    17” LCD Color Monitor Wipro WLA171t Revision List Revision Date Revision History TPV Model Mar.-02-07 Initial Release T76CM4HCALWNE...
  • Page 3: Important Safety Notice

    Wipro WLA171t Important Safety Notice Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service procedures recommended by AOC and described in this service manual are effective methods of performing service operations. Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended.
  • Page 4: Monitor Specification

    17” LCD Color Monitor Wipro WLA171t 1. Monitor Specifications Driving system TFT Color LCD Size 43.2cm(17.0") LCD Panel Pixel pitch 0.264mm( H ) × 0.264mm( V ) Viewable angle 160° (H) 160° (V) Response time 5 ms Video R,G,B Analog Interface Separate Sync.
  • Page 5: Lcd Monitor Description

    17” LCD Color Monitor Wipro WLA171t 2. LCD Monitor Description The LCD monitor will contain a main board, a power board, a key board and an audio board which house the flat panel control logic, brightness control logic and DDC.
  • Page 6: Operation Instruction

    17” LCD Color Monitor Wipro WLA171t 3. Operating Instructions 3.1 General Instructions Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the monitor (See Figure 3). By changing these settings, the picture can be adjusted to your personal preferences.
  • Page 7 17” LCD Color Monitor Wipro WLA171t Front Panel Control • Power Button: Press this button to turn the monitor ON or OFF. • Power Indicator: Green — Power On mode. Orange — Off mode. • 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 Brightness /Contrast Adjust OSD status.
  • Page 8: Adjusting The Picture

    17” LCD Color Monitor Wipro WLA171t 3.3 Adjusting The Picture Press the MENU-button to activate the OSD window. 1. Press to navigate through the functions. Once the desired function is highlighted, press the MENU-button < or > to activate it. If the function selected has a sub-menu, press again to navigate through the sub-menu <...
  • Page 9 17” LCD Color Monitor Wipro WLA171t Adjusting The Picture The descriptions for function control LEDS Main Main Menu Sub Menu Menu Sub Menu Icon Description Item Item Icon Contrast Contrast from Digital-register. Luminance Brightness Backlight Adjustment Focus Adjust Picture Phase to reduce Horizontal-Line noise...
  • Page 10 17” LCD Color Monitor Wipro WLA171t Main Main Sub Menu Menu Menu Sub Menu Icon Description Item Item Icon H. Position Adjust the horizontal position of the OSD. V. Position Adjust the vertical position of the OSD. Setup OSD Timeout Adjust the OSD timeout.
  • Page 11: Input/Output Specification

    17” LCD Color Monitor Wipro WLA171t 4. Input/Output Specification 4.1 Input Signal Connector Pin No. Description Pin No. Description Red Video + 5V Green Video Detect Cable Blue Video DDC-Serial Data Ground H-Sync Red Ground V-Sync Green Return DDC-Serial Clock...
  • Page 12: Panel Specification

    17” LCD Color Monitor Wipro WLA171t 4.3 Panel Specification CLAA170EA07P is 17.0” color TFT-LCD (Thin Film Transistor Liquid Crystal Display) module composed of LCD panel, driver ICs, control circuit and backlight. By applying 8 bit digital data, 1280×1024, 16.2M-color images are displayed on the 17.0”...
  • Page 13 17” LCD Color Monitor Wipro WLA171t 4.3.3. Electrical Characteristics (1)TFT-LCD (2)Backlight...
  • Page 14: Block Diagram

    17” LCD Color Monitor Wipro WLA171t 5. Block Diagram 5.1 Software Flow Chart...
  • Page 15 17” LCD Color Monitor Wipro WLA171t 1) MCU initializes. 2) Is the EPROM blank? 3) Program the EPROM by default values. 4) Get the PWM value of brightness from EPROM. 5) Is the power key pressed? 6) Clear all global flags.
  • Page 16: Electrical Block Diagram

    17” LCD Color Monitor Wipro WLA171t 5.2 Electrical Block Diagram 5.2.1 Main Board Crystal Panel Interface 20MHz (CN503) (X601) Scalar IC TSU16AK Crystal W78E065A40PL 14.318MHZ (Include ADC, OSD) (U601) (X401) (U401) H sync V sync EEPROM OSD Control D-Sub M24C16...
  • Page 17 17” LCD Color Monitor Wipro WLA171t 5.2.2 Power Board Bridge Rectifier AC input Transformer Rectifier diodes EMI filte r and Filter Start Circuit: R906、R907 CN102 Feedback Over Voltage Control IC Circuit Protect ON/OFF Output MOSFET Transformer Q203、Q204 Circuit Lamp Feedback...
  • Page 18: Schematic

    17” LCD Color Monitor Wipro WLA171t 6. Schematic 6.1 Main Board GNDR GNDR GNDG GNDG DDC_CLK VCC2.5 VCC3.3 VAA1 VAA2 VAA3 VAA4 DDC_DAT GNDB GNDB ST_DET1 HSYNC HSYNC ST_DET2 VSYNC VSYNC VCC2.5 VCC3.3 VAA1 VAA2 VAA3 CLK+ CLK+ VAA4 CLK- CLK- 3.INPUT...
  • Page 19 17” LCD Color Monitor Wipro WLA171t VCC5V+ VCC5V SOT-252 D202 U201 VCC12V R202 GS1D VCC2.5 VCC12V RT9164 CN201   1/16W VCC2.5 ON_OFF R201 4.7K   1/16W C210 C211 C212 VCC12V VCC12V D201 SS14 C201 R212 4.7K 1/16W 0.1uF 47uF/16V 0.1uF  ...
  • Page 20 17” LCD Color Monitor Wipro WLA171t CN301 DB15 FB301   1/16W R301   1/16W C304 0.047uF FB302 1/16W R302 1/16W C305 0.047uF     FB303   1/16W R303   1/16W C306 0.047uF R304   1/16W C307 0.001uF PC5V R325 C301...
  • Page 21 17” LCD Color Monitor Wipro WLA171t VCC3.3 FB401 VCC2.5 FB402 VCC3.3 VCC2.5 600 OHM 600 OHM C405 C414 10uF/16V 10uF/16V VPLL VDVI VDPLL C406 C407 C408 C409 C410 C411 C412 C413 C415 C416 C417 C418 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF...
  • Page 22 17” LCD Color Monitor Wipro WLA171t PA[0..9] PA[0..9] LVA3P CN503 LVA3M LVACKP LVACKM LVB0M RXO0- RXO0+ LVB0P LVA2P LVB1M RXO1- RXO1+ LVB1P LVA2M LVB2M RXO2- RXO2+ LVB2P LVBCKM RXOC- RXOC+ LVBCKP LVA1P RXO3- RXO3+ LVB3M LVB3P LVA1M LVA0M RXE0- RXE0+...
  • Page 23 17” LCD Color Monitor Wipro WLA171t VCPU VCPU RN601 R601 R602 C601 RN602 1/16W     1/16W 1/16W 0.1uF     1/16W C602 22pF U601 X601 POWER EA/VP P0.0 ENTER P0.1 RIGHT XTAL1 P0.2 C603 20MHz LEFT P0.3 10uF/16V VCPU AUTO P0.4...
  • Page 24: Power Board

    17” LCD Color Monitor Wipro WLA171t 6.2 Power Board NR901 R920 C920   1/2W 0.001uF/500V NTCR BD901 T901 F902 2KBP06M D910 31DQ10 FUSE TO INVERTER L903 CN102 R906 R904 C906 R903 C922 C924 C928 FB903   1/4W   1/4W 0.0015uF/2KV 100K  ...
  • Page 25 R241 D208 R235 51K  1N4148   1/4W C222 R239 C220 R237 0.47uF/63V 12K  1uF/25V AOC (Top Victory) Electronics Co., Ltd. Title is power GND FOR SAMSUNG M170EU-L01 INVERTER Size Document Number Monday, July 04, 2005 is signal GND Date: Sheet...
  • Page 26: Audio Board

    17” LCD Color Monitor Wipro WLA171t 6.3 Audio Board OUT_L OUT_R +12V PIN-3 CN202 WAFER 2*7P 2.54mm MUTE PIN-1 VOLUME C202 C201 C203 470uF/16V 470uF/16V 0.1uF PIN-1 U201 TDA7496L CN204 C205 CN203 C204 0.47uF R201 10K  OUTL 470uF/16V C206 0.47uF OUTR R203 10K ...
  • Page 27: Pcb Layout

    17” LCD Color Monitor Wipro WLA171t 7. PCB Layout 7.1 Main Board...
  • Page 28 17” LCD Color Monitor Wipro WLA171t...
  • Page 29: Power Board

    17” LCD Color Monitor Wipro WLA171t 7.2 Power Board...
  • Page 30 17” LCD Color Monitor Wipro WLA171t...
  • Page 31: Audio Board

    17” LCD Color Monitor Wipro WLA171t 7.3 Audio Board 7.4 Key Board...
  • Page 32: Maintainability

    17” LCD Color Monitor Wipro WLA171t 8. Maintainability 8.1 Equipments And Tools Requirement Voltmeter. Oscilloscope. Pattern Generator. DDC Tool with an IBM Compatible Computer. Alignment Tool. LCD Color Analyzer. Service Manual. User Manual.
  • Page 33: Trouble Shooting

    17” LCD Color Monitor Wipro WLA171t 8.2 Trouble Shooting 8.2.1 Main Board No Power No power Press power key and look if the picture is normal Please reinsert and make sure the AC of 100-240 is normal Reinsert or check the...
  • Page 34 17” LCD Color Monitor Wipro WLA171t No Picture (LED orange) No picture The button if under X601 oscillate Replace X601 control waveform is normal Check Correspondent Check reset circuit of component U601 is normal Measure U201 PIN2=2.5V U202 PIN2=3.3V Replace U601...
  • Page 35 17” LCD Color Monitor Wipro WLA171t White Screen White screen Measure Q204 base X601 oscillate waveform is normal is high level? Replace X601 Check Q203, Q204 are Check reset circuit of broken or CN503 solder? U601 is normal Check Correspondent Check Correspondent component.
  • Page 36 17” LCD Color Monitor Wipro WLA171t 8.2.2 Power Board No power...
  • Page 37 17” LCD Color Monitor Wipro WLA171t W / LED, No Backlight Check CN102 pin12 =12V Check adapter or MB Check ON/OFF signal Check Interface board Check U201 pin9=12V Change Q201 or Q202 Check the pin1 of U201 have saw tooth wave Change U201 Check D201 (-),D202 (-) have the output of square wave at short time.
  • Page 38 17” LCD Color Monitor Wipro WLA171t 8.2.3 Key Board OSD is unstable or not working Is Key Pad Board connecting normally? Connect Key Pad Board Replace Button Switch Is Button Switch normally? Is Key Pad Board normally? Replace Key Pad Board...
  • Page 39: White-Balance, Luminance Adjustment

    17” LCD Color Monitor Wipro WLA171t 9. White-Balance, Luminance Adjustment Approximately 30 minutes should be allowed for warm up before proceeding White-Balance adjustment. 1. How to do the Chroma-7120 MEM. Channel setting A. Reference to chroma 7120 user guide B. Use “ SC” key and “ NEXT” key to modify x,yY value and use “ID” key to modify the TEXT description Following is the procedure to do white-balance adjust 2.
  • Page 40: Monitor Exploded View

    17” LCD Color Monitor Wipro WLA171t 10. Monitor Exploded View...
  • Page 41 17” LCD Color Monitor Wipro WLA171t DESCRIPTION PART NO. DESCRIPTION PART NO. BEZEL Q34G1271 72A1B REAR COVER 034G1272 72 5B POWER LENS 033G4694 1 C SHIELD 085G6080 2 BASE T34G1455 72 B AUDIO BOARD AUPC780A9P KEY BOARD KEPC780KMNP MAIN BOARD...
  • Page 42: Bom List

    17” LCD Color Monitor Wipro WLA171t 11. BOM List T76CM4HCALWNE Location Part No. Description 007G 5 L148 COMPOUND PALLET 007G 5 L149 COMPOUND PALLET 007G 5 L156 COMPOUND PALLET 007G 5 L157 COMPOUND PALLET 015G5786 1 VRSA BRACKET 015G5908 2...
  • Page 43 17” LCD Color Monitor Wipro WLA171t 033G4694 1 C POWER LENS 033G4695 1 C CLAMP 034G1273 72 B STAND M037 037G 489 1 HINGE ASS'Y E078L 078G 322501 L SPEAKER E078R 078G 322501 R SPEAKER 0Q1G 330 8120 SCREW 3X8mm...
  • Page 44 17” LCD Color Monitor Wipro WLA171t C204 067G215B221 4H LOW E.S.R 220UF +-20% 25V C202 067G215B221 4H LOW E.S.R 220UF +-20% 25V CN301 088G 35315F H D-SUB 15PIN X401 093G 22 53 J 14.31818MHZ/32PF/49US X601 093G 22 55 J 20MHz/20PF/49US...
  • Page 45 17” LCD Color Monitor Wipro WLA171t R302 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R301 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R310 061G0603102 RST CHIP 1K 1/10W 5% R203 061G0603102 RST CHIP 1K 1/10W 5% R311 061G0603102 RST CHIP 1K 1/10W 5%...
  • Page 46 17” LCD Color Monitor Wipro WLA171t R623 061G0603471 RST CHIPR 470 OHM +-5% 1/10W R304 061G0603471 RST CHIPR 470 OHM +-5% 1/10W R201 061G0603472 RST CHIPR 4.7KOHM +-5% 1/10W R205 061G0603472 RST CHIPR 4.7KOHM +-5% 1/10W R207 061G0603472 RST CHIPR 4.7KOHM +-5% 1/10W...
  • Page 47 17” LCD Color Monitor Wipro WLA171t C613 065G0603104 32 CHIP 0.1UF 50V X7R C612 065G0603104 32 CHIP 0.1UF 50V X7R C201 065G0603104 32 CHIP 0.1UF 50V X7R C203 065G0603104 32 CHIP 0.1UF 50V X7R C205 065G0603104 32 CHIP 0.1UF 50V X7R...
  • Page 48 17” LCD Color Monitor Wipro WLA171t D601 093G 39147 TZMC5V6 D323 093G 39147 TZMC5V6 D322 093G 39147 TZMC5V6 D321 093G 39147 TZMC5V6 D320 093G 39147 TZMC5V6 D319 093G 39147 TZMC5V6 D318 093G 39147 TZMC5V6 D317 093G 39147 TZMC5V6 D304 093G 64 42 P...
  • Page 49 17” LCD Color Monitor Wipro WLA171t Q210 057G 761 6 2SC5706-P-E Q209 057G 761 6 2SC5706-P-E R919 061G 2J398 59 0.39 OHM 2W NR901 061G 58080 WT 8 OHM NCT R903 061G152M104 64 100KOHM 5% 2W C904 063G107K474 HS X2 CAP 0.47UF K 275VAC...
  • Page 50 17” LCD Color Monitor Wipro WLA171t U201 056G 622 1 BA9741F-SMT Q205 057G 417 4 PMBS3904/PHILIPS-SMT(04) Q206 057G 417 4 PMBS3904/PHILIPS-SMT(04) Q207 057G 417 6 PMBS3906/PHILIPS-SMT(06) Q208 057G 417 6 PMBS3906/PHILIPS-SMT(06) Q202 057G 760 4B PDTA144WK SOT346 Q201 057G 760 5B...
  • Page 51 17” LCD Color Monitor Wipro WLA171t R905 061G1206754 RST CHIPR 750 KOHM +-5% 1/4W R910 061G1206820 2F RST CHIPR 82 KOHM +-1% 1/4W C927 065G0805104 32 CHIP 0.1U 50V X7R C910 065G0805105 22 CHIP 1UF 25V X7R 0805 C203 065G0805105 27...
  • Page 52 17” LCD Color Monitor Wipro WLA171t R203 061G 60210352T CFR 10KOHM +-5% 1/6W R223 061G 60212352T 12KOHM 5% 1/6W R222 061G 60212352T 12KOHM 5% 1/6W R238 061G 60212352T 12KOHM 5% 1/6W R239 061G 60212352T 12KOHM 5% 1/6W R210 061G 60215352T...
  • Page 53 17” LCD Color Monitor Wipro WLA171t FB901 071G 55 29 FERRITE BEAD F901 084G 56 1 FUSE 2A 250V WICKMANN ZD902 093G 39 5452T HZ12B2-E ZD903 093G 39 7752T HZ5C1-E D901 093G 6026T52T RECTIFIER DIODE FR107 D902 093G 6038P52T PS102R...

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