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Owner's Manual
LM722
SERVICE MANUAL
17" LCD Monitor
LM722
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT
HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE
ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RE LIABILITY FOR
CHANGES, ERRORS OR OMISSIONS.
Page 1 of 48
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Table of Contents
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Summary of Contents for AOC LM722
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Page 1: Service Manual
LM722 SERVICE MANUAL 17” LCD Monitor LM722 THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RE LIABILITY FOR CHANGES, ERRORS OR OMISSIONS. -
Page 2: Table Of Contents
LM722 Content List CONTENT LIST..........................2 Revision List ……………………………..…………………………………………………………….…..3 1. MONITOR SPECIFICATIONS ....................5 2. LCD MONITOR DESCRIPTION ....................5 3. OPERATING INSTRUCTIONS ....................6 3.1 GENERAL INSTRUCTIONS .........................6 3.2 FRONT PANEL CONTROL ........................6 3.3 ADJUSTING THE PICTURE .........................6 4. INPUT/OUTPUT SPECIFICATION ..................... 8 4.1 I... - Page 3 LM722 8.2.2 POWER/INVERTER BOARD ........................32 9. WHITE- BALANCE, LUMINANCE ADJUSTMENT ..............34 10. EDID ............................35 11. BOM LIST ..........................36 Page 3 of 48...
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Page 4: Revision List
LM722 Revision List Revision Date Modification Mar-24-2004 Page 4 of 48... -
Page 5: Monitor Specifications
LM722 1. MONITOR SPECIFICATIONS 43.2 cm (17”) a-si TFT Active matrix LCD panel, 0.264mm pixel pitch. Microprocessor controlled scan technology 17 factory presets Vertical refresh rate 55Hz to 75 Hz Horizontal frequency 30kHz to 80kHz Resolutions: 640 x 480 up to 1280 x 1024... -
Page 6: Operating Instructions
LM722 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 LM722 Brightness Backlight Adjustment Focus Adjust Picture Phase to reduce Horizontal-Line noise Image Setup Clock Adjust picture Clock to reduce Vertical-Line noise. H. Position Adjust the horizontal position of the picture. Image Position V. Position Adjust the vertical position of the picture.
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Page 8: Input/Output Specification
LM722 4. Input/Output Specification 4.1 Input Signal Connector 4.1.1 Analog D-SUB Connector PIN NO. DESCRIPTION PI N NO. DESCRIPTION Green Logic Ground Blue DDC-Serial Data DDC-Return H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground VGA connector layout 4.2 Factory Preset Display Modes... -
Page 9: Power Supply Requirement
LM722 IBM MODES Horizontal Vertical Nominal Nominal Nominal Sync Sync Pixel 2Mode Resolution Total Frequency Freq. Polarity Polarity Clock +/- 0.5kHz +/- 1 Hz (MHz) DOS* 720x400@70Hz 900 x 449 31.469 70.087 28.322 DOS** 640x400@70Hz 800 x 449 31.469 70.087 25.175... -
Page 10: Optical Specification
LM722 4.4.2 Optical Specification 4.4.3 ELECTRICAL SPECIFICATIONS 5. Block Diagram 5.1 Monitor Explored Page 10 of 48... -
Page 11: Software Flowing Chart
LM722 5.2 Software flowing Chart Page 11 of 48... - Page 12 LM722 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. 7) Are the AUTO and SELECT keys pressed? 8) Enter factory mode.
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Page 13: Electrical Block Diagram
LM722 5.2 Electrical Block Diagram 5.2.1 Main Board LCD Interface Scalar GMZAN3/SL (BD) PQFB-100 SM5964C40J (Include ADC, OSD) (U101) (U102) OSD Control H sync EPR_SDA V sync Interface EPR_SCL EEPROM D-Sub 24C16 Connector (CN301) DB15_SDA, DB15_SCL EEPROM 24C02 Page 13 of 48... -
Page 14: Inverter/Power Board
LM722 5.2.2 Inverter/Power Board Inverter Block Diagram Page 14 of 48... - Page 15 LM722 Power Block Diagram Page 15 of 48...
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Page 16: Schematic
LM722 6. Schematic 6.1 Main Board 47£[ 1/16W DB-RXD R102 RXD 2 2.7K£[ 1/16W C102 D102 R177 56pF DB-TXD R103 47£[ 1/16W C103 D103 R178 2.7K£[ 1/16W 56pF CN301 DB15 DB-RXD FB101 0£[ 1/16W R101 100£[ 1/16W C104 0.047uF RED+... - Page 17 LM722 +3.3V_VDD 3.3V_DVDD +1.8V_VDD 1.8V_DVDD 56.95mA 114mA L101 C123 C124 C125 C126 C127 C128 L102 C130 C131 C132 C133 C134 C135 120 OHM 120 OHM C129 C122 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 22uF 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V 3.3V_DVDD...
- Page 18 LM722 +12V 600 OHM FB105 CN601 R189 FB106 120 OHM(NC) 470£[ 1/16W STANDBY AUDIO_STDBY R150 1K£[ 1/16W AUDIO_MUTE R187 4.7K£[ 1/16W MUTE R181 1K£[ 1/16W SPKR_L+ SPKR_R+ LINE-IN-L LINE-IN-R R184 VOLUME C178 C151 1K£[ 1/16W CONN Q106 +3.3V_VDD +3.3V_VDD R192...
- Page 19 LM722 CN503 LVDS_O0 RXO0- RXO0+ LVDS_O1 LVDS_O2 RXO1- RXO1+ LVDS_O3 LVDS_O4 RXO2- RXO2+ LVDS_O5 LVDS_O[0..9] LVDS_O6 RXOC- RXOC+ LVDS_O7 LVDS_O8 RXO3- RXO3+ LVDS_O9 LVDS_O0 LVDS_E0 RXE0- RXE0+ LVDS_E1 LVDS_O1 LVDS_E2 RXE1- RXE1+ LVDS_E3 LVDS_O2 LVDS_E4 RXE2- RXE2+ LVDS_E5 LVDS_O3 LVDS_E6...
- Page 20 LM722 CN501 C182 C183 +12V 47uF/25V 0.1uF/16V CONN CN201 TO-263 For 15" ON_OFF R162 4.7K£[ 1/16W PBIAS VCC12V VCC12V TO223 For 17" 19" VCC5V VCC5V +3.3V_VDD U503 1.435A CON402(PITCH 2.00) VOUT R163 142mA C165 C167 C168 C166 47uF/25V 0.1uF/16V AIC1084-33CE 0.1uF/16V...
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Page 21: Power Board
LM722 6.2 Power Board Page 21 of 48... - Page 22 LM722 Page 22 of 48...
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Page 23: Key Board
POWER_ KEY LED_ORANGE LED_GRN SPKR_R+ SPKR_L+ SW101 SW102 SW103 SW104 SW105 CONN DP101 AOC (Top Victory) Electronics Co., Ltd. Title KEYPAD FOR 15" NMV Size Document Number 715L1222-B KEYPAD CIRCUIT Date: Thursday, October 07, 2004 Sheet Page 23 of 48... -
Page 24: Audio Board
LM722 6.4 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 U201 PIN-1 TDA7496L CN204 C205 CN203 C204 0.47uF R201 10K£[ OUTL 470uF/16V C206 0.47uF OUTR R203 10K£[ R212 C207... -
Page 25: Layout
LM722 7. Layout 7.1 Main Board 7.2 Audio Board Page 25 of 48... -
Page 26: Power Board
LM722 7.3 Power Board Page 26 of 48... -
Page 27: Maintainability
LM722 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 27 of 48... -
Page 28: Trouble Shooting
LM722 8.2 Trouble Shooting Defect Mode Failure Analysis Repair Testing Missing Line Abnormal Display Bright Dot Dark Dot Light Leakage Mura Check Panel Panel Change Image Sticking Dot Defect Brightness Spot Dot Defect Particle No display Check Power Board Change Power Board... - Page 29 LM722 Noise Check Single Cable Change Single Cable Flicker Check Main board Change Main board Change Panel Check Panel Abnormal Check Main board Change Main board Gray Check Panel Change Panel Check LVD Cable Change LVD Cable R\G\B Check Single Cable...
- Page 30 LM722 LED Display Change Keyboard or LED Off Abnormal Main board or wire Change Keyboard or LED Dark Main board Change Keyboard or LED Abnormal Main board or wire Change Keyboard or LED Flicker Main board or wire Abnormal Check Wires...
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Page 31: Keypad Board
LM722 INVERTER CONTROL RELATIVE CIRCUIT Check the Backlight control Measured the inverter connector CN201 relative circuit, the Pin2 on/off control=3.3V (on) Base of Q201 is low level Pin4 PWM signal control dim 0V-5V normal condition Replace Q201 NG, still no screen... -
Page 32: Power/Inverter Board
LM722 8.2.2 POWER/INVERTER BOARD 1.) No power Check CN902 pin2, 4 = 12V Check AC line volt 110V or 220V Check AC input Check the voltage of C905(+) Check bridge rectified circuit and F901 circut Check start voltage for the pin3 of IC901... - Page 33 LM722 2.) No Backlight Check C201 (+) =12V Change F902 Check ON/OFF signal Check main board Check U201 pin9=12V Change Q201 or Q202 Check the pin1 of U201 have saw tooth wave Change U201 Check D201 (-) have the output of square wave at short time Check Q205/Q207/Q203/D201 Check Check the resonant wave of pin2 &...
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Page 34: White- Balance, Luminance Adjustment
6500 color temp. parameter is x = 313±10, y = 329 ±10, Y = 200 ±10 cd/m 3. Into factory mode of LM722 Press MENU button during 2 seconds along with press Power button will activate the factory mode, then MCU will do AUTO LEVEL automatically. -
Page 35: Edid
LM722 10. EDID Page 35 of 48... -
Page 36: Bom List
LM722 11. BOM List T780KCLHBAAOA AUPC780AT AUDIO BORD CBPC780KCLAC CONVERSION BOARD KEPC780KE5 KEY BOARD PWPC7425A3E22C POWER BOARD 15G5786 VRSA BRACKET 15G5908 BRACKET 15G6090 MAIN FRAME 26G 800504 BARCODE 34L1272 GM 5B REAR COVER 34L1455 GM BASE 40G 190615 ID LABEL... - Page 37 LM722 Q1L 330 8120 SCREW 3X8mm Q1L 330 10 47 SCREW (T3X10) Q1L 330 12 47 SCREW 705L780KB34071 BACK COVER ASS'Y 750LLC70A07 CPT 17" EA07 110 SOC PA AM1L1740 10 47 SCREW AUPC780AT AUPC780ATSMT AUDIO BOARD FOR SMT CN202 33L802414C...
- Page 38 LM722 C136 67L305V220 22UF 16V C140 67L305V220 22UF 16V C143 67L215V100 7K EC 10UF 50V NC C158 67L215V100 7K EC 10UF 50V NC C161 67L305V221 4N LOWESR (SHORT) C162 67L305V221 4N LOWESR (SHORT) C165 67L305V470 CAPEC 47uF/25 C166 67L305V470 CAPEC 47uF/25...
- Page 39 LM722 C124 65L0603104 12 0.1UF +-10% 16V X7R C125 65L0603104 12 0.1UF +-10% 16V X7R C126 65L0603104 12 0.1UF +-10% 16V X7R C127 65L0603104 12 0.1UF +-10% 16V X7R C128 65L0603104 12 0.1UF +-10% 16V X7R C130 65L0603104 12 0.1UF +-10% 16V X7R...
- Page 40 LM722 C181 65L0603101 32 100PF +-10% 50V X7R C183 65L0603104 12 0.1UF +-10% 16V X7R C184 65L0603104 12 0.1UF +-10% 16V X7R C185 65L0603224 22 CHIP 0.22UF 25V X7R D101 6433P BAV99 D102 39147 TZMC5V6 D103 39147 TZMC5V6 D104 93G 39S 39...
- Page 41 LM722 Q107 57G 417 PMBS3904/PHILIPS-SMT(04 R101 61L0603100 0F CHIP 100OHM 1/10W 1% R102 61L0603470 CHIPR 47 OHM +-5% 1/10W R103 61L0603470 CHIPR 47 OHM +-5% 1/10W R104 61L0603100 0F CHIP 100OHM 1/10W 1% R105 61L0603100 0F CHIP 100OHM 1/10W 1%...
- Page 42 LM722 R149 61L0603472 CHIPR 4.7K OHM +-5% 1/1 R150 61L0603102 CHIPR 1K OHM +-5% 1/10W R152 61L0603101 CHIPR 100 OHM +-5% 1/10 R153 61L0603101 CHIPR 100 OHM +-5% 1/10 R154 61L0603102 CHIPR 1K OHM +-5% 1/10W R155 61L0603102 CHIPR 1K OHM +-5% 1/10W...
- Page 43 LM722 RP102 61L 125330 CHIP AR 894R 33OHM +-5% RP103 61L 125472 CHIP AR 8P4R 4.7K OHM+- U101 56L1125522CT2 SM5964C40J U102 56L 562 72 GMZAN3/SL (BD) PQFB-100 U502 56G 563 27 AIC1117A-18CY SOT-223 U503 56L 585 AIC1117-33CY KEPC780KE5 AIK780KMN KEY BOARD...
- Page 44 LM722 C925 67L 215102 3H 1000UF +-20% 16V CN102 95G8021 12520 WIRE HARNESS CN201 33G8021 2D 3.5mm WAFER CN202 33G8021 2D 3.5mm WAFER CN203 33G8021 2D 3.5mm WAFER CN204 33G8021 2D 3.5mm WAFER CN301 88L 30210K PHONE JACK CN302 33L3278...
- Page 45 LM722 C225 65L0805105 27 CHIP 1UF 25V Y5V 0805 C910 65L0805104 32 CHIP 0.1UF 50V X7R C927 65L0805104 32 CHIP 0.1UF 50V X7R D201 93G3004 SR34 PAN JIT D202 93G3004 SR34 PAN JIT D203 93G 39S BZT52-C11 D204 93G 39S...
- Page 46 LM722 R912 61L1206101 CHIP 100 OHM 5% 1/4W R915 61L1206103 CHIP 10KOHM 5% 1/4W R916 61L1206240 2F CHIP 24KOHM1% 1/4W R917 61L1206100 CHIPR 10 OHM+-5% 1/4W R918 61L1206103 CHIP 10KOHM 5% 1/4W R924 61L0805333 CHIP 33KOHM 1% 1/8W R925 61L0603362 CHIP 3.6K OHM 1/10W...
- Page 47 LM722 D205 64 1152T 1N4148 D206 64 1152T 1N4148 D207 64 1152T 1N4148 D208 64 1152T 1N4148 D209 64 1152T 1N4148 D210 64 1152T 1N4148 D901 6026T52T RECTIFIER DIODE FR107 D902 6038T52T FR103 D903 64 1152T 1N4148 F901 FUSE 2A 250V WICKMANN...
- Page 48 LM722 R235 61L 60291152T CFR 910 OHM+-5% 1/6W R236 61L 60262152T 620 OHM 5% 1/6W R237 61L 60262152T 620 OHM 5% 1/6W R238 61L 60212352T 12KOHM 5% 1/6W R239 61L 60212352T 12KOHM 5% 1/6W R240 61L 60251352T 51KOHM +-5% 1/6W...