AOC LM926 Service Manual
AOC LM926 Service Manual

AOC LM926 Service Manual

19'' lcd color monitor

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19 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.......................................10
4.1.Input Signal Connector..........................................10
4.2 Power Supply Requirement................................11
N
4.3.Factory Preset Display Modes................................11
4.4.Panel Specification...............................................12
5.Block Diagram.........................................................15
5.1.Software Flow Chart...........................................15
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
5.2.Electrical Block Diagram...................................17
6.Schematic...........................................................19
6.1.Main Board.................................................19
6.2 Power Board.......................................................24
6.3. Audio Board.......................................................26
7.PCB Layout...........................................................27
7.1.Main Board.......................................................27
7.2 Power Board........................................................30
7.3. Audio Board.......................................................33
7.4.Key Board..........................................................34
8.Maintainability........................................................35
8.2.Trouble Shooting...............................................36
10.Monitor Exploded View.....................................43
11.BOM List...............................................................44
SAFETY NOTICE
1
AOC LM926
Horizontal Frequency
30-83 kHz
Page

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Summary of Contents for AOC LM926

  • Page 1: Table Of Contents

    19 LCD Color Monitor AOC LM926 Service Service Service Horizontal Frequency 30-83 kHz TABLE OF CONTENTS Description Page Description Page 5.2.Electrical Block Diagram….………….……..…..17 Table Of Contents..……......…..1 6.Schematic…………………........…19 Revision List.…........……..2 6.1.Main Board..........19 Important Safety Notice.……......……..3 6.2 Power Board..…..….…........24 1.Monitor Specification......………..4 6.3. Audio Board..………..…........26 2.LCD Monitor Description……………………………..5...
  • Page 2: Revision List

    19 LCD Color Monitor AOC LM926 Revision List Revision Date Revision History TPV Model May-23-07 Initial Release T96HM6DLG3CKA...
  • Page 3: Important Safety Notice

    AOC LM926 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

    19 LCD Color Monitor AOC LM926 1. Monitor Specifications Items Descriptions Driving system TFT Color LCD Size 48cm (19") LCD Panel Pixel pitch 0.294mm( H )x 0.294mm( V ) Viewable angle 140 (H) 135 (V) Response time (type) 8 ms...
  • Page 5: Lcd Monitor Description

    19 LCD Color Monitor AOC LM926 2. LCD Monitor Description The LCD monitor will contain a main board, an audio board, a power board and a key board which house the flat panel control logic, brightness control logic and DDC.
  • Page 6: Operation Instruction

    19 LCD Color Monitor AOC LM926 3. Operating Instructions 3.1 General Instructions Press the power button to turn the monitor on or off. The 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 19 LCD Color Monitor AOC LM926 Connecting Cables Power Cable 15-pin D-Sub Cable DVI Cable Audio Cord FRONT PANEL CONTROL Power Button: Press this button to turn the monitor ON or OFF. Power Indicator: Green — Power On mode. Orange —...
  • Page 8: Adjusting The Picture

    19 LCD Color Monitor AOC LM926 3.3 Adjusting the Picture 1. Press the MENU-button to activate the OSD window. 2. Press to navigate through the functions. Once the desired function is highlighted, press the MENU-button to activate it. If the function selected has a sub-menu, press again to navigate through the sub-menu functions.
  • Page 9 19 LCD Color Monitor AOC LM926 User / Blue Blue Gain from Digital-register. Input Select Analog Select input signal from analog source (D-Sub) Digital Select input signal from digital source (DVI) OSD Setup H. Position Adjust the horizontal position of the OSD.
  • Page 10: Input/Output Specification

    19 LCD Color Monitor AOC LM926 4. Input/Output Specification 4.1 Input Signal Connector 1. D-SUB connector Pin No. Description Pin No. Description + 5V Green Detect Cable Blue Ground DDC-Serial Data Ground H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground VGA connector layout 2.
  • Page 11: Power Supply Requirement

    19 LCD Color Monitor AOC LM926 4.2 Power Supply Requirement A/C Line voltage range : 100 V ~ 240 V A/C Line frequency range : 50 3Hz, 60 Current : TBD Peak surge current : < 55A peak at 240 VAC and cold starting Leakage current : <...
  • Page 12: Panel Specification

    19 LCD Color Monitor AOC LM926 4.4 Panel Specification 4.4.1 Introduction 4.4.2 Display Characteristics...
  • Page 13 19 LCD Color Monitor AOC LM926 4.4.3 Optical Characteristics...
  • Page 14 19 LCD Color Monitor AOC LM926 4.4.4 Electrical Characteristics 1. TFT LCD Module 2. Backlight Unit...
  • Page 15: Block Diagram

    19 LCD Color Monitor AOC LM926 5. Block Diagram 5.1 Software Flow Chat...
  • Page 16 19 LCD Color Monitor AOC LM926 1) MCU initialize. 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 17: Electrical Block Diagram

    19 LCD Color Monitor AOC LM926 5.2 Electrical Block Diagram 5.2.1 Main Board LCD Interface (CN101) Flash Memory EEPROM Scalar IC TSUM56AK PM25LV512-25SCE M24C16 (U402) (Include MCU, ADC, OSD) (U403) (U401) Digital H sync Video V sync Signal Crystal Key Board D-Sub 14.318MHz...
  • Page 18 19 LCD Color Monitor AOC LM926 5.2.2 Inverter/Power Board...
  • Page 27: Pcb Layout

    19" LCD Color Monitor LM926 7. PCB Layout 7.1 Main Board...
  • Page 28 19" LCD Color Monitor LM926...
  • Page 29 19" LCD Color Monitor LM926...
  • Page 30: Power Board

    19" LCD Color Monitor LM926 7.2 Power Board...
  • Page 31 19" LCD Color Monitor LM926...
  • Page 32 19" LCD Color Monitor LM926...
  • Page 33: Audio Board

    19" LCD Color Monitor LM926 7.3 Audio Board...
  • Page 34: Key Board

    19" LCD Color Monitor LM926 7.4 Key Board...
  • Page 35: Maintainability

    19" LCD Color Monitor LM926 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 36: Trouble Shooting

    19" LCD Color Monitor LM926 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 37 19" LCD Color Monitor LM926 No picture (LED orange) No picture The button if under control Measure D701(-)=1.8V U702 PIN2=3.3V Check U701, D701, D702, Q702 X401 oscillate waveform is normal Replace X401 Check HS/VS from CN405 is normal Replace U401...
  • Page 38 19" LCD Color Monitor LM926 White screen White screen Measure Q706 base X401 oscillate waveform is normal is high level? Replace X401 Check Q706, Q704 is Check reset circuit of broken or CN101 solder? U401 is normal Check Correspondent Check Correspondent component.
  • Page 39 19" LCD Color Monitor LM926 8.2.2 Power/Inverter Board (1) No power Check CN902 pin3/4 = 12V Check AC line volt 110V or 220V Check AC input Check the voltage of C910 (+) Check bridge rectified circuit and F901 circuit Check start voltage for the pin8 of IC901...
  • Page 40 19" LCD Color Monitor LM926 2.) W / LED, No Backlight Check CN902 pin3,4 = 12V Check adapter or MB Check ON/OFF signal Check Interface board Check IC801 pin2=12V Change Q802 or Q803 Check IC801 PIN1/15 have the output of square wave at short...
  • Page 41 19" LCD Color Monitor LM926 8.2.3 Keypad Board OSD is unstable or not working Is Key Pad Board connecting normally? Connect Key Pad Board Replace Button Switch Is Button Switch normally? Replace Key Pad Board Is Key Pad Board normally?
  • Page 42: White-Balance Luminance Adjustment

    19" LCD Color Monitor LM926 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 yY value and use “ID”...
  • Page 44: Bom List

    19" LCD Color Monitor LM926 11. BOM List T96HM6DLG3CKA Location Part No. Description 050G 600 2 HANDLE1 050G 600 3 HANDLE2 052G 1185 MIDDLE TAPE 052G 1186 SMALL TAPE 052G 1207 A ALUMINIUM TAPE 078G 322508 L SPK 8OHM 1.5W VECO 078G 322508 R SPK 8OHM 1.5W VECO...
  • Page 45 19" LCD Color Monitor LM926 A33G0030 GM 1L 32 CABLE COVER A34G0042 GM 5B REAR COVER AM1G1740 8 47 CR3 SCREW AM1G1740 12225 CR3 SCREW AUPC6QA7P AUDIO BOARD CN202 033G802414C H 2*7PIN DUAL ROW RIGHT ANGLE H U201 056G 616 1...
  • Page 46 19" LCD Color Monitor LM926 C710 067G215V101 4N KY25VB100M-CC3(6.3*11) C712 067G215V101 4N KY25VB100M-CC3(6.3*11) C707 067G215V101 4R LOW E.S.R 100UF +/-20% 25V C710 067G215V101 4R LOW E.S.R 100UF +/-20% 25V C712 067G215V101 4R LOW E.S.R 100UF +/-20% 25V C408 067G305V100 3P...
  • Page 47 19" LCD Color Monitor LM926 R421 061G0603000 RST CHIPR 0 OHM +-5% 1/10W R431 061G0603000 RST CHIPR 0 OHM +-5% 1/10W R432 061G0603000 RST CHIPR 0 OHM +-5% 1/10W R720 061G0603000 RST CHIPR 0 OHM +-5% 1/10W R721 061G0603000 RST CHIPR 0 OHM +-5% 1/10W...
  • Page 48 19" LCD Color Monitor LM926 R485 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W R484 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W R444 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W R426 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W R727 061G0603103 RST CHIPR 10 KOHM +-5% 1/10W...
  • Page 49 19" LCD Color Monitor LM926 C413 065G0603104 32 CHIP 0.1UF 50V X7R C414 065G0603104 32 CHIP 0.1UF 50V X7R C440 065G0603104 32 CHIP 0.1UF 50V X7R C441 065G0603104 32 CHIP 0.1UF 50V X7R C444 065G0603104 32 CHIP 0.1UF 50V X7R...
  • Page 50 19" LCD Color Monitor LM926 FB406 071G 56Z601 CHIP BEAD 600 OHM 0805 FB405 071G 56Z601 CHIP BEAD 600 OHM 0805 FB404 071G 56Z601 CHIP BEAD 600 OHM 0805 FB403 071G 56Z601 CHIP BEAD 600 OHM 0805 FB402 071G 56Z601...
  • Page 51 19" LCD Color Monitor LM926 D417 093G 6433P BAV99 D404 093G 6433P BAV99 D405 093G 6433P BAV99 D403 093G 6433S DIODE BAV99 SEMTECH D404 093G 6433S DIODE BAV99 SEMTECH D405 093G 6433S DIODE BAV99 SEMTECH D401 093G 39S 45 T...
  • Page 52 19" LCD Color Monitor LM926 C816 065G 3J1206ET 12PF 5% SL 3KV TDK C825 065G 3J1206ET 12PF 5% SL 3KV TDK C817 065G 3J3096ET 3PF,J,3KV,Z5P C826 065G 3J3096ET 3PF,J,3KV,Z5P C901 065G305M1022E2 1000P 400VAC/250VAC C902 065G305M1022E2 1000P 400VAC/250VAC C901 065G305M1022EM Y2 1000PF +-20% 250VAC...
  • Page 53 19" LCD Color Monitor LM926 T901 080GL17T 33 N POWER X'FMR T901 080GL17T 33 T XFMR FOR POWER TDK PT801 080GL17T 36 H XFMR FOR INVERTER DADON PT802 080GL17T 36 H XFMR FOR INVERTER DADON PT802 080GL17T 36 DN XFMR FOR POWER DARFON...
  • Page 54 19" LCD Color Monitor LM926 R927 061G0805101 RST CHIPR 100 OHM +-5% 1/8W R930 061G0805101 RST CHIPR 100 OHM +-5% 1/8W R928 061G0805102 RST CHIPR 1KOHM +-5% 1/8W R925 061G0805102 RST CHIPR 1KOHM +-5% 1/8W R913 061G0805102 RST CHIPR 1KOHM +-5% 1/8W...
  • Page 55 19" LCD Color Monitor LM926 R828 061G1206150 RST CHIPR 15 OHM +-5% 1/4W R829 061G1206150 RST CHIPR 15 OHM +-5% 1/4W R807 061G1206220 RST CHIPR 22 OHM +-5% 1/4W R802 061G1206304 300 KOHM 1/8W R900 061G1206334 RST CHIPR 330KOHM +-5% 1/4W...
  • Page 56 19" LCD Color Monitor LM926 D915 093G 64 44 S LL4148WP D916 093G 64 44 S LL4148WP D916 093G 6432S IN4148W D915 093G 6432S IN4148W D910 093G 6432S IN4148W D802 093G 6433P BAV99 D804 093G 6433P BAV99 ZD801 093G 39S 24 T RLZ 5.6B LLDS...
  • Page 57 GETE COVER Q40G 19N61531A RATING L ABEL Q40G0002634 1A C-TICK LABEL Q41G7800615A76 WARRANTY CARD Q44G3944615 1A 19 AOC LCD CARTON Q44G9032 1 EPS(L) Q44G9032 2 EPS(R) Q45G 88606 R PE BAG FOR BASE Q45G 88606 16 PE BAG FOR CLAMP...

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