AOC 2236Vwh Service Manual

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21.5" LCD Color Monitor

Service

Description

Table Of Contents..........................................................1

Description

Revision List.................................................................2

1. Monitor Specification..................................................4

1. Monitor Specification..................................................3

2. LCD Monitor Description........................................5

2.LCD Monitor Description........................................4

3. Operation Instruction.............................................6

3. Operation Instruction.............................................5

3.1 General Instructions...................................................6

3.1 General Instructions...................................................5

3.2 Control Button....................................................6

3.2 Control Button....................................................5

3.3 Adjusting the Picture..........................................6

3.3 Adjusting the Picture..........................................5

4. Input/Output Specification.......................................8

4.1 Input Signal Connector.......................................8

4.2 Factory Preset Display Modes.........................9

5 Panel Specification..................................................10

5.1 Display Characteristics....................................10

5.2 Optical Characteristics.....................................10

5.2 Optical Characteristics......................................10

5.3 Electrical Characteristics.................................11

5.3 Parameter guide line for CCFL Inverter.................10

6. Block Diagram...............................................12

6 Block Diagram

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

Page

Description

6.1 Software Flow Chart.........................................12

Page

6.2 Electrical Block Diagram.................................14

7. Schematic.................................................... 16

7.1 Main Board..........................................................16

7.2 Power Board.......................................................22

8. PCB Layout..........................................................24

8.1 Main Board.....................................................24

8.2 Power Board........................................................26

8.3 Key Board.......................................................28

8.4 USB Board.........................................................29

9. Maintainability........................................................30

9.1. Equipments and Tools Requirement.....................30

9.2. Trouble Shooting................................................31

10. White-Balance, Luminance adjustment.................37

11. Monitor Exploded View...................................39

12. BOM List..............................................................40

SAFETY NOTICE

AOC 2236Vwh

Horizontal Frequency

30-80 kHz

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Summary of Contents for AOC 2236Vwh

Page 1: Table Of Contents
21.5" LCD Color Monitor AOC 2236Vwh Service Service Service Horizontal Frequency 30-80 kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents..……....……...…..1 6.1 Software Flow Chart…….…..…………..12 Table Of Contents..……....……...…..1 Description Page Revision List.…......………....……..2 6.2 Electrical Block Diagram………...………...…..14 Revision List.…......………....……..2 1.
Page 2: Revision List
AOC 2236Vwh 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 3: Revision List
21.5" LCD Color Monitor AOC 2236Vwh Revision List Version Date Revision History Remark HI9GSBNM6WA1PNE June.-01-2010 Initial release HI9GSBNL6WA1PNE HIAGSBNE6WA1P1E Aug.-26-2010 Add new Models HIAGSBNE6WA1PNE HIBKSBNJ6WA1DNE Dec.-06-2011 Add new Models HIBGSBNJ6WA1D1E HIBGSBNJ6WA1DNE...
Page 4: Monitor Specification
21.5" LCD Color Monitor AOC 2236Vwh 1. Monitor Specification Model name 2236Vwh Driving system TFT Color LCD Viewable Image Size 54.7cm diagonal Pixel pitch 0.248mm(H) x 0.248mm(V) LCD Panel Video R, G, B Analog lnterface & HDMI Separate Sync. H/V TTL Display Color 16.7M Colors...
Page 5: Lcd Monitor Description
21.5" LCD Color Monitor AOC 2236Vwh 2. LCD Monitor Description The LCD MONITOR will contain a main board, a power board, an audio board, two USB boards and a key board which house the flat panel control logic, brightness control logic and DDC.
Page 6: Operation Instruction
21.5" LCD Color Monitor AOC 2236Vwh 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. By changing these settings, the picture can be adjusted to your personal preferences.
Page 7: Adjusting The Picture
21.5" LCD Color Monitor AOC 2236Vwh 3.3 Adjusting the Picture Eco mode DCR, Standard, Text, Internet, Game, Movie, Sports Notes : When Eco mode is not set as “Standard”, Contrast and Brightness can not be adjusted; When DCR is set as “On”, Contrast, Brightness, Eco mode and Gamma can not be adjusted.
Page 8: Input/Output Specification
21.5" LCD Color Monitor AOC 2236Vwh 4. Input/Output Specification 4.1 Input Signal Connector 4.1.1 D-SUB connector PIN NO. DESCRIPTION PI N NO. DESCRIPTION Video-Red Video-Green Ground Video-Blue N.C. N.C. DDC-Serial data Detect Cable H-sync GND-R V-sync GND-G DDC-Serial clock GND-B 4.1.2 HDMI connector...
Page 9: Factory Preset Display Modes
21.5" LCD Color Monitor AOC 2236Vwh 4.2 Factory Preset Display Modes HORIZONTAL VERTICAL STAND RESOLUTION FREQUENCY(kHZ) FREQUENCY(Hz) 640×480 @60Hz 31.469 59.94 640×480 @67Hz 66.667 640×480 @72Hz 37.861 72.809 640×480 @75Hz 37.5 Dos-mode 720×400 @70Hz 31.469 70.087 SVGA 800×600 @56Hz 35.156 56.25...
Page 10: Panel Specification
21.5" LCD Color Monitor AOC 2236Vwh 5 Panel Specification 5.1 Display Characteristics 5.2 Optical Characteristics...
Page 11: Electrical Characteristics
21.5" LCD Color Monitor AOC 2236Vwh 5.3 Electrical Characteristics 1.TFT LCD Module: Note：The specified current and power consumption are under the Vlcd=5.0V,25±2℃,Fv=60Hz condition whereas mosaic pattern(8ⅹ6) is displayed and Fv is the frame frequency. 2.Back Light Unit: The backlight interface connector is a model 35001HS-02LD manufactured by Yeonho. The mating connector part number are 35001WR-02L or equivalent.
Page 12: Block Diagram
21.5" LCD Color Monitor AOC 2236Vwh 6. Block Diagram 6.1 Software Flow Chart...
Page 13 21.5" LCD Color Monitor AOC 2236Vwh REMARK: 1) MCU initialize. 2) Is the EEprom blank? 3) Program the EEprom by default values. 4) Get the PWM value of brightness from EEprom. 5) Is the power key pressed? 6) Clear all global flags.
Page 14: Electrical Block Diagram
21.5" LCD Color Monitor AOC 2236Vwh 6.2 Electrical Block Diagram 6.2.1 Scalar Board Crystal 14.31818MHz LCD Interface (X401) (CN404) Scalar TSUMU58KDT-LF-1 FLASH MEMORY EN25F20 (Include :MCU,ADC,OSD etc) (U402) (U401) H sync V sync D-Sub HDMI EEPROM Connector Connector M24C04 (CN101)
Page 15 21.5" LCD Color Monitor AOC 2236Vwh 6.2.2 Inverter / Power Board AC input Bridge Rectifier EMI filter Transformer Rectifier diodes and Filter Start Circuit:R908 CN902 Feedback Over Circuit Voltage Control IC Protect ON/OFF Transformer MOSFET Resonance Lamp Over ON/OFF Feedback...
Page 16: Schematic
21.5" LCD Color Monitor AOC 2236Vwh 7. Schematic 7.1 Main Board 715G3262 2 VCC3.3 CN701 +5V1 R701 10K 1/16W 5% R702 100R 1/16W 5% Adj_BACKLIGHT 4 ON/OFF VCC3.3 VCC3.3 R703 10K 1/16W 5% CONN C702 C701 C703 R704 0.1uF 16V...
Page 17 21.5" LCD Color Monitor AOC 2236Vwh RED+ FB101 0R05 1/16W R101 56 OHM 1/16W C101 0.047uF RED- GREEN+ FB102 0R05 1/16W R102 56 OHM 1/16W C102 0.047uF GREEN- BLUE+ FB103 0R05 1/16W R103 56 OHM 1/16W C103 0.047uF BLUE- R104...
Page 18 21.5" LCD Color Monitor AOC 2236Vwh VCC3.3 FB404 AVDD_DAC VCC1.2 FB405 VDDC VDDP VCC3.3 VCC3.3 VCC1.2 120 OHM 120 OHM FB402 C410 C414 C415 C416 C417 VCC3.3 C412 C413 VCC3.3 FB403 AVDD_33 0.1uF 16V 0.1uF 16V 0.1uF 16V 0.1uF 16V 0.1uF 16V...
Page 19 21.5" LCD Color Monitor AOC 2236Vwh CN302 LVB0M RXO0- RXO0+ LVB0P LVB1M RXO1- RXO1+ LVB1P LVB2M RXO2- RXO2+ LVB2P LVBCKM RXOC- RXOC+ LVBCKP LVB3M RXO3- RXO3+ LVB3P LVA0M RXE0- RXE0+ LVA0P LVA1M RXE1- RXE1+ LVA1P LVA2M RXE2- RXE2+ LVA2P LVACKM...
Page 20 21.5" LCD Color Monitor AOC 2236Vwh HDMIESD U501 CN501 HDMI HDMI1_CK- HDMI1_CK- R501 0R05 1/16W HCK- HCK- Line-4 HDMI1_CK+ HDMI1_CK+ R502 0R05 1/16W HCK+ HCK+ SHELL1 Line-3 HDMI1_D2+ HDMI1_D0- HDMI1_D0- R503 0R05 1/16W HD0- HD0- D2 Shield Line-2 HDMI1_D2- HDMI1_D0+...
Page 21 21.5" LCD Color Monitor AOC 2236Vwh CN605 R610 9K1 OHM 1/16W 5% LINE_IN_0L 4 R611 9K1 OHM 1/16W 5% LINE_IN_0R 4 PHONEJACK +5V1 FB601 +5V_AUDIO +5V1 120 OHM CN602A C627 220uF 25V +5V_AUDIO C615 C616 C617 C618 CONN 0.1uF 16V 0.1uF 16V...
Page 22: Power Board
21.5" LCD Color Monitor AOC 2236Vwh 7.2 Power Board 715G2892 5 4 R929 100 OHM 1/4W BD901 C916 L905 KBP208G R930 100 OHM 1/4W 0.001uF Coil +16V R903 100 OHM 1/4W ZD9 01 C918 Q904 TZX18B 1000uF25V KTD1028 D901 FMX-12SL...
Page 23 21.5" LCD Color Monitor AOC 2236Vwh R817 +16V 2R2 1/8W 5% Q805 ZD802 ON/OFF RLZ5.6B ZD803 RLZ5.6B R816 2R2 1/8W 5% R802 +5Vi R803 R804 PT801 CN801 AO4620 5K1 1/8W 5% 5K1 1/8W 5% POWER X'FMR C819 CONN 22R 1/8W 5%...
Page 24: Pcb Layout
21.5" LCD Color Monitor AOC 2236Vwh 8. PCB Layout 8.1 Main Board 715G3262 2...
Page 25 21.5" LCD Color Monitor AOC 2236Vwh...
Page 26: Power Board
21.5" LCD Color Monitor AOC 2236Vwh 8.2 Power Board 715G2892 5 4...
Page 27 21.5" LCD Color Monitor AOC 2236Vwh...
Page 28: Key Board
21.5" LCD Color Monitor AOC 2236Vwh 8.3 Key Board 715G3371 2...
Page 29: Usb Board
21.5" LCD Color Monitor AOC 2236Vwh 8.4 USB Board 715G2663 2 715G3501 2...
Page 30: Maintainability
21.5" LCD Color Monitor AOC 2236Vwh 9. Maintainability 9.1 Equipments and Tools Requirement 1. Multi-meter. 2. Oscilloscope. 3. Pattern Generator. 4. DDC Tool with an Compatible Computer. 5. Alignment Tool. 6. LCD Color Analyzer. 7. Service Manual. 8. User Manual.
Page 31: Trouble Shooting
21.5" LCD Color Monitor AOC 2236Vwh 9.2 Trouble Shooting 9.2.1 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 power section Measure U702 Vout=3.3V,...
Page 32 21.5" LCD Color Monitor AOC 2236Vwh No Picture No picture Measure U702 Vout=3.3V, U703 Vout =1.2V Replace CN701,U702,U703 X401 oscillate waveforms are normal Replace X401 Check if the sync signal from computer is output and video cable is connected normally...
Page 33 21.5" LCD Color Monitor AOC 2236Vwh White Screen White screen Measure Q703 base is X401 oscillate low level? waveform is normal Replace X401 Check reset circuit of Check Q702.Q703 is U401 is normal broken,or CN404 solder? Check Check Correspondent Correspondent component.
Page 34 21.5" LCD Color Monitor AOC 2236Vwh 9.2.2 Power Board 1) No power Check CN902 Pin3,4=5V Check AC line volt 110V or 240V Check AC input Check the voltage of C907 (+) Check bridge rectified circuit and F901 circuit Check start voltage for the pin8 of IC901...
Page 35 21.5" LCD Color Monitor AOC 2236Vwh 2.) No Backlight Check C804(+)=16V Check adapter and Q805,Q806 Check ON/OFF signal Check Interface board or main board Check IC801 PIN6/10=16V Change on/off circuit Check IC801 PIN13 have saw tooth wave Change IC801 Check PT801 have the output of square wave at short time...
Page 36 21.5" LCD Color Monitor AOC 2236Vwh 9.2.3 Key Board OSD is unstable or not working Is Keypad board connecting normally? Connect Keypad Board Is Button Switch normally? Replace Button Switch Replace Keypad Board Is Keypad board normally? Check main board...
Page 37: White-Balance, Luminance Adjustment
21.5" LCD Color Monitor AOC 2236Vwh 10. 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.
Page 38 21.5" LCD Color Monitor AOC 2236Vwh 1. Switch the chroma-7120 to RGB-Mode (with press “MODE” button) 2. Switch the MEM.channel to Channel 9(with up or down arrow on chroma 7120) 3. The LCD-indicator on chroma 7120 will show x = 283 ±30, y = 297 ±30, Y =170 cd/m 4.
Page 39: Monitor Exploded View
21.5" LCD Color Monitor AOC 2236Vwh 11. Monitor Exploded View...
Page 40: Bom List
POWER BOARD Q45G 76 28 H PE BAG FOR MANUAL Q45G 76 28V13 PE BAG Q50G 4 10 TIE (Y1900221) Q52G 1185 99 big carton tape for aoc E08907 S89G179T30NA05 FFC CABLE USB9HA3 USB BOARD USB9HA4 USB BOARD 0Q1G1740 12120 SCREW...
Page 41 21.5" LCD Color Monitor AOC 2236Vwh A34G1065ABJ 1S0100 Stand-Back A34G1162AED 1S0130 BASE A37G0108 3 Hinge H01G6006 1 Screw 756GH9CB A1032 MAIN BOARD-CBPC9SBA1H2 SMTCR-U402 100GAMGI007W11 MCU ASS'Y-056G1133 81 CN602 033G3802 4 WAFER PH-4 CN403 033G3802 7B Y conn 2.0 7p CN701 033G380210B Y CONN 2.0 10P...
Page 42 21.5" LCD Color Monitor AOC 2236Vwh BD901 093G 50460502 KBP206G CN511 033G3802 5 BH CONNECTOR 5PIN CN512 088G 352 2 XH USB CONN 715G2663 2 USB PCB 18.5X60X1.6MM FR-1 S/S 1OZ CN501 033G3802 5B Y CONN 2.0 5P CN502 088G 351 2B XH...
Page 43 21.5" LCD Color Monitor AOC 2236Vwh R515 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R514 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R433 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R432 061G0402101 RST CHIPR 100 OHM +-5% 1/16W R411 061G0402101...
Page 44 21.5" LCD Color Monitor AOC 2236Vwh R519 061G0402223 RST CHIPR 22 KOHM +-5% 1/16W R509 061G0402273 RST CHIP 27K 1/16W 5% R403 061G0402390 0F RST CHIP 390R 1/16W 1% R442 061G0402392 RST CHIP 3.9K 1/16W 5% R443 061G0402392 RST CHIP 3.9K 1/16W 5%...
Page 45 21.5" LCD Color Monitor AOC 2236Vwh C410 065G040210412K CAP CHIP 0402 100nF K 16V X7R C414 065G040210412K CAP CHIP 0402 100nF K 16V X7R C415 065G040210412K CAP CHIP 0402 100nF K 16V X7R C416 065G040210412K CAP CHIP 0402 100nF K 16V X7R...
Page 46 21.5" LCD Color Monitor AOC 2236Vwh D102 093G 64 42 P BAV70 SOT23 BY PAN JIT ZD102 093G 39S 24 T RLZ 5.6B LLDS ZD502 093G 39S 24 T RLZ 5.6B LLDS 715G3262 2 MAIN PCB CN001 033G8034 6H H WAFER 1.0mm SMT 6P...
Page 47 21.5" LCD Color Monitor AOC 2236Vwh R845 061G0603682 RST CHIPR 6.8 KOHM +-5% 1/10W R842 061G0603682 RST CHIPR 6.8 KOHM +-5% 1/10W R843 061G0603682 RST CHIPR 6.8 KOHM +-5% 1/10W R810 061G0603750 2F RST CHIPR 75KOHM +-1% 1/10W R837 061G0603752 RST CHIPR 7.5 KOHM +-5% 1/10W...
Page 48 21.5" LCD Color Monitor AOC 2236Vwh C810 065G0603222 32 CHIP 2200PF 50V X7R C805 065G0603223 32 CHIP 0.022UF 50V X7R 0603 C807 065G0603332 32 CHIP 0.0033UF 50V X7R 0603 C808 065G0603333 32 CHIP 0.033UF 50V X7R 0603 C914 065G0603471 32...
Page 49 21.5" LCD Color Monitor AOC 2236Vwh J819 095G 90 23 JUMPER WIRE J820 095G 90 23 JUMPER WIRE J821 095G 90 23 JUMPER WIRE J822 095G 90 23 JUMPER WIRE J823 095G 90 23 JUMPER WIRE J901 095G 90 23...

AOC 2236Vwh Service Manual

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