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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..........................................6
4.Input/Output Specification.......................................9
4.1.Input Signal Connector.........................................9
4.2.Factory Preset Display Modes.........................10
N
4.3.Panel Specification...............................................10
5.Block Diagram........................................................13
5.1.Software Flow Chart.........................................13
5.2.Electrical Block Diagram.................................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
6.Schematic...........................................................17
6.1.Main Board.................................................17
6.2.Power Board.....................................................21
6.3.Key Board.....................................................23
7.PCB Layout...........................................................24
7.1.Main Board.......................................................24
7.2.Power Board..........................................25
7.3.Key Board..........................................................27
8.Maintainability........................................................28
8.1.Equipments and Tools Requirement...............28
8.2.Trouble Shooting..........................................29
9.White-Balance Luminance adjustment.................35
10.Monitor Exploded View....................................37
11.BOM List........................................................38
12.Different Parts List........................................50
SAFETY NOTICE
1
Lenovo L194 Wide
Horizontal Frequency
30-81 kHz
Page
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Summary of Contents for Lenovo L194 Wide
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Page 1: Table Of Contents
19” LCD Color Monitor Lenovo L194 Wide Service Service Service Horizontal Frequency 30-81 kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents..……......…..1 6.Schematic…………………........…17 Revision List.…........……..2 6.1.Main Board..........17 Important Safety Notice.……......……..3 6.2.Power Board..……….…........21 1.Monitor Specification......………..4 6.3.Key Board..……….…........23 2.LCD Monitor Description……………………………..5 7.PCB Layout..………………........24... -
Page 2: Revision List
19” LCD Color Monitor Lenovo L194 Wide Revision List Revision Date Revision History TPV Model Aug-16-07 First Version Release T97MMMDBLWG9HN T97MMMDDLWG9HN Aug-23-07 Add New BOM T97MMMDMLWG9HN Add New BOM T97MMMDBLWG9HN T97MMMDDLWG9HN Add New BOM Oct-31-07 T97MMMDMLWG9HN T97MMMDDLWG8HN Add New BOM... -
Page 3: Important Safety Notice
19” LCD Color Monitor Lenovo L194 Wide 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. -
Page 4: Monitor Specification
19” LCD Color Monitor Lenovo L194 Wide 1. Monitor Specifications Items Descriptions Driving system TFT Color LCD Type M190A1-L07 Size 48.14cm (19.05") LCD Panel Pixel pitch 0.285mm( H )x 0.285mm( V ) Viewable angle 170˚ (H) 160˚ (V) (CR≥10) Response time (type) 5 ms for CMO panel Sync. -
Page 5: Lcd Monitor Description
19” LCD Color Monitor Lenovo L194 Wide 2. LCD Monitor Description The LCD MONITOR will contain a main board, a power board and a key board which house the flat panel control logic, brightness control logic and DDC. The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage. -
Page 6: Operation Instruction
19” LCD Color Monitor Lenovo L194 Wide 3. Operating Instructions 3.1 General Instructions Press the power button to turn the monitor on or off. The control buttons are located on the right side of the monitor. By changing these settings, the picture can be adjusted to your personal preferences. - Page 7 19” LCD Color Monitor Lenovo L194 Wide OSD functions...
- Page 8 19” LCD Color Monitor Lenovo L194 Wide...
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Page 9: Input/Output Specification
19” LCD Color Monitor Lenovo L194 Wide 4. Input/Output Specification 4.1 Input Signal Connector Pin No. Description Pin No. Description +5VDC Red Input Green Input Blue Input H Sync Connection detect V Sync Red GND Green GND Blue GND Pin No... -
Page 10: Factory Preset Display Modes
19” LCD Color Monitor Lenovo L194 Wide 4.2. Factory Preset Display Modes 4.3 Panel Specification M190A1-L07 is a 19” wide TFT Liquid Crystal Display module with 4 CCFL Backlight unit and 30 pins 2ch-LVDS interface. This module supports 1440 x 900 WXGA+ mode and can display 16.7M colors. The inverter module for Backlight is not built in. - Page 11 19” LCD Color Monitor Lenovo L194 Wide 4.3.3 Optical Characteristics TEST CONDITIONS The following items should be measured under the test conditions described in table above: 4.3.4 Electrical Characteristics 1. TFT LCD Module...
- Page 12 19” LCD Color Monitor Lenovo L194 Wide 2. Backlight Units...
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Page 13: Block Diagram
19” LCD Color Monitor Lenovo L194 Wide 5. Block Diagram 5.1 Software Flow Chat... - Page 14 19” LCD Color Monitor Lenovo L194 Wide 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.
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Page 15: Electrical Block Diagram
19” LCD Color Monitor Lenovo L194 Wide 5.2 Electrical Block Diagram 5.2.1 Main Board LCD PANEL Crystal14.31818MHz (CN301) (X201) EPR_SDA FLASH ROM EPR_SCL Scalar IC HUM56AWHL-LF-1 MSTAR PM25LV010A (Include ADC, OSD, MCU) (U402) (U202) H sync V sync EEPROM Key Board... - Page 16 19” LCD Color Monitor Lenovo L194 Wide 5.2.2 Inverter/Power Board 5V Rectifier and Filter Transformer Bridge Rectifier and T901 12V Rectifier EMI filter Filter and Filter Start Circuit: R904，R932，R933 CN902 Feedback Over PWM Control IC Voltage Circuit IC TEA1530AT Protect...
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Page 17: Schematic
19” LCD Color Monitor Lenovo L194 Wide 6. Schematic 6.1 Main Board 715G2698 3 R101 0R05 1/10W 5% R102 1K 1/16W DSUB_H R103 1K 1/16W FB102 DSUB_V ZD101 ZD102 VGA_B+ R104 100R 1/16W C101 DSUB_B+ R105 R106 C102 C103 BEAD 0.047uF... - Page 18 19” LCD Color Monitor Lenovo L194 Wide CN301 PA[0..9] PA[0..9] LVA3P LVB0M RXO0- LVA3M LVB0P RXO0+ LVACKP LVB1M RXO1- LVACKM LVB1P RXO1+ LVA2P LVB2M RXO2- LVA2M LVB2P RXO2+ LVA1P LVA1M LVBCKM RXOC- LVA0P LVBCKP RXOC+ LVA0M LVB3M RXO3- LVB3P RXO3+...
- Page 19 19” LCD Color Monitor Lenovo L194 Wide CN401 VCC3.3 VCC3.3 CMVCC CMVCC R401 R403 CMVCC BKLT-VBRI 10K 1/16W 10K 1/16W BKLT-EN C_PANEL_INDEX PANEL_ID# BKLT-EN Volume# Volume# Mute C406 Mute Q403 R404 on_BACKLIGHT 2 CONN C405 2N3904S-RTK/PS 4K7 1/16W 0.1uF/16V DGND 1,2,3 VCC3.3...
- Page 20 19” LCD Color Monitor Lenovo L194 Wide VDVI VMPLL VPLL AVDD VDDP VDDC VDDP VCC3.3 VCC3.3 FB203 AVDD VCC3.3 FB204 VPLL VCC3.3 300OHM 300OHM C203 C204 C206 C208 VCTRL C202 10uF/50V 0.1uF/16V C205 C207 0.1uF/16V LVA3P 0.1uF/16V 0.1uF/16V DSUB_R+ RIN0P LVA3M 0.1uF/16V...
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Page 21: Power Board
19” LCD Color Monitor Lenovo L194 Wide 6.2 Power Board 715G2538 1 1/4W R918 F902 ZD902 0R05 1/4W R921 R922 R923 +12V 1/4W R919 L904 C912 1.1uH R928 0.001uF 1/4W R920 C922 470uF/25V C917 C918 680uF/25V 680uF/25V... - Page 22 19” LCD Color Monitor Lenovo L194 Wide T801 POWER X'FMR D805 R817 R821 BAW56 10K 1/10W 1K 1/10W 1% CN801 R855 CONN 1/4W F801 C819 0R05 1/4W 0.0022uF +12V C801 3.6KOHM 1/10W C802 10pF/3KV R819 470uF/25V C824 R801 D801 0.1uF...
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Page 23: Key Board
19” LCD Color Monitor Lenovo L194 Wide 6.3 Key Board LED001 LED_GRN# R001 LED_Y ELLOW R006 R007 CN001 R002 2KOHM +-1% 1/10W LBADC1 R003 LBADC2 1KOHM +-1% 1/10W DC_POWERON LED_GRN# LED_Y ELLOW# R008 0 OHM +-5% 1/8W R004 ZD006 ZD007... -
Page 24: Pcb Layout
19” LCD Color Monitor Lenovo L194 Wide 7. PCB Layout 7.1 Main Board 715G2698 3... -
Page 25: Power Board
19” LCD Color Monitor Lenovo L194 Wide 7.2 Power Board 715G2538 1... - Page 26 19” LCD Color Monitor Lenovo L194 Wide...
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Page 27: Key Board
19” LCD Color Monitor Lenovo L194 Wide 7.3 Key Board... -
Page 28: Maintainability
19” LCD Color Monitor Lenovo L194 Wide 8. Maintainability 8.1 Equipments And Tools Requirement Voltmeter. Oscilloscope. Pattern Generator. DDC Tool with Compatible Computer. Alignment Tool. LCD Color Analyzer. Service Manual. User Manual. -
Page 29: Trouble Shooting
19” LCD Color Monitor Lenovo L194 Wide 8.2 Trouble Shooting 8.2.1 Main Board No power Press power key and look if the picture is normal Please reinsert and make sure the 5V input is normal Reinsert or check the power section Measure U701 Pin2=3.3V and U702 PIN2=1.8V... - Page 30 19” LCD Color Monitor Lenovo L194 Wide (2) No picture No picture The button if under X201 oscillate Replace X201 control waveform is normal Check Correspondent Check reset circuit of component U202 is normal Measure U701 PIN2=3.3V and U702 PIN2=1.8V...
- Page 31 19” LCD Color Monitor Lenovo L194 Wide (3) White screen White screen Measure Q301 base X201 oscillate waveform is normal is low level? Replace X201 Check Q301,Q302 is Check reset circuit of broken or CN301 solder? U202 is normal Check Correspondent Check Correspondent component.
- Page 32 19” LCD Color Monitor Lenovo L194 Wide 8.2.2 Power/Inverter Board No power Check CN902 pin4, 5 = 12V Check AC line volt 110V or 220V Check AC input Check the voltage of C905(+) Check bridge rectified circuit and F901 circut...
- Page 33 19” LCD Color Monitor Lenovo L194 Wide W / LED, No Backlight Check CN902 pin4, 5 = 12V Check the adapter and F801 Check ON/OFF signal and the pin 12 of IC801 is 12V Check main board or change ON/OFF signal...
- Page 34 19” LCD Color Monitor Lenovo L194 Wide 8.2.3 Keypad Board OSD is unstable or not working Connect Key Pad Board Is Key Pad Board connecting normally? Replace Button Switch Is Button Switch normally? Replace Key Pad Board Is Key Pad Board normally?
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Page 35: White-Balance Luminance Adjustment
= 313 ±20, y = 329 ±20, Y= 180±20cd/m 3. Into Factory mode of Lenovo L194 Wide: Press the MENU button, pull out the power cord, and then plug the power cord. Then the factory OSD will be at the left top of the panel. - Page 36 19” LCD Color Monitor Lenovo L194 Wide C. Adjust Bluish (9300K) color-temperature 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 ±20, y = 297 ±20, Y=180±20cd/m 4.
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Page 37: Monitor Exploded View
19" LCD Color Monitor Lenovo L194 Wide 10. Monitor Exploded View... -
Page 38: Bom List
19" LCD Color Monitor Lenovo L194 Wide 11. BOM List T97MMMDBLWG9HN Location Part No. Description 012G 404 1 SCREW RUBBER 040G 581 26704 SHIPPING LABEL 044G600260811A PAPER BOARD 044G9003214 CORNER PAPER 045G 77 3 PE PACKING 052G 1150 C INSULATING TAPE... - Page 39 19" LCD Color Monitor Lenovo L194 Wide CN103 088G 35424F N DVI 24PIN CONN F WITH SCREWS XAT01431AFI1H-3OHX AT-49 X201 093G 2253B H 14.31818MHZ Q85G 583605 GASKET_ALUMINIUM FOIL U202 056G 562550 IC HUM56AWHL-LF-1 MSTAR U702 056G 563 31 IC AZ1117D-1.8-E1...
- Page 40 19" LCD Color Monitor Lenovo L194 Wide R140 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W R406 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W R102 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W R103 061G0402102 RST CHIPR 1 KOHM +-5% 1/16W R137...
- Page 41 19" LCD Color Monitor Lenovo L194 Wide R116 061G0402750 RST CHIPR 75 OHM +-5% 1/16W R212 061G0402750 RST CHIPR 75 OHM +-5% 1/16W R101 061G0603000 RST CHIPR 0 OHM +-5% 1/10W R302 061G0805331 RST CHIPR 330 OHM +-5% 1/8W C106...
- Page 42 19" LCD Color Monitor Lenovo L194 Wide C102 065G0402220 31 CHIP 22PF 50V NPO C103 065G0402220 31 CHIP 22PF 50V NPO C221 065G0402220 31 CHIP 22PF 50V NPO C222 065G0402220 31 CHIP 22PF 50V NPO C218 065G0402224 17 CAP CER 0.22UF -20%-80%...
- Page 43 19" LCD Color Monitor Lenovo L194 Wide D107 093G 39GA01 T RLZ5.6B D108 093G 39GA01 T RLZ5.6B ZD101 093G 39GA01 T RLZ5.6B D109 093G 39GA01 T RLZ5.6B 715G2698 3 MAIN BOARD PCB KEPC7QE2 KEY BOARD SW004 077G 600 1GCJ TACT SWITCH TSPB-2 -NP...
- Page 44 19" LCD Color Monitor Lenovo L194 Wide C922 067G215D4714KV E.C 105℃ CAP 470UF M 25V ED SERIES C918 067G215D6814KV CAP 105℃ 680UF M 25V C917 067G215D6814KV CAP 105℃ 680UF M 25V C939 067G215S1024KV EC 105℃ CAP 1000UF M 25V C915 067G215S4713KV EC 105℃...
- Page 45 19" LCD Color Monitor Lenovo L194 Wide R926 061G0603100 2F RST CHIPR 10K OHM +-1% 1/10W R834 061G0603100 2F RST CHIPR 10K OHM +-1% 1/10W R833 061G0603100 2F RST CHIPR 10K OHM +-1% 1/10W R832 061G0603100 2F RST CHIPR 10K OHM +-1% 1/10W...
- Page 46 19" LCD Color Monitor Lenovo L194 Wide R810 061G0805510 2F RST CHIPR 51K OHM +-1% 1/8W R931 061G0805822 RST CHIPR 8.2 KOHM +-5% 1/8W JR801 061G1206000 RST CHIPR 0 OHM +-5% 1/4W JR802 061G1206000 RST CHIPR 0 OHM +-5% 1/4W...
- Page 47 19" LCD Color Monitor Lenovo L194 Wide C841 065G0805102 31 CAP CHIP 0805 1000PF J 50V NPO C838 065G0805102 31 CAP CHIP 0805 1000PF J 50V NPO C840 065G0805102 31 CAP CHIP 0805 1000PF J 50V NPO C839 065G0805102 31...
- Page 48 Q41G780060842A Q44G9087 1 EPS (L) Q44G9087 2 EPS (R) Q44G9087608 2C 19 LCD LENOVO CARTON Q45G 88606 22 PE BAG Q45G 88609 95 EPE BAG Q52G 1185 95 BIG CARTON TAPE FOR LENOVO Q52G6025 13138 MYLAR E08907 S89G179T30N8 LVDS ASS'Y...
- Page 49 Lenovo L194 Wide 089F80001773AG 1.0*30*2.5-177-3-0.65*0.05 033F303FH10BK3 F1010HA-30P-BK 033F303FJSHK30 1.0S-19-30A 070GHDCP500HDC HDCP CODE Q41G780060844A STW FOR L194 WIDE Q45G2007M0203A PE BAG FOR LENOVO Q70G9002608 8B CD MANUAL 040G 459625 5A PALLET LABEL 040G 58162435A P/N LABEL 040G 582625 2A S/N LABEL...
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Page 50: Different Part List
19" LCD Color Monitor Lenovo L194 Wide 12. Different Part List Diversity of T97MMMDBLWG8HN compared with T97MMMDBLWG9HN Location Part No. Description 089G410A18NLSL POWER CORD Diversity of T97GMMDBLWG7HC compared with T97MMMDBLWG9HN Location Part No. Description 089G404A18NLSL POWER CORD 750GLG90W1A11N000X PANEL LM190WX1-TLA1 KR LPL... - Page 51 19" LCD Color Monitor Lenovo L194 Wide Diversity of T97MMMDMLWG9HN compared with T97MMMDBLWG9HN Location Part No. Description E089A 089G 728HAA 1 SIGNAL CABLE E089B 089G1748HAA AC DVI CABLE Diversity of T97MMMDLLWG9HN compared with T97MMMDBLWG9HN Location Part No. Description 041G 68508 A...
- Page 52 19" LCD Color Monitor Lenovo L194 Wide Diversity of T97MMMDDLWG6HN compared with T97MMMDBLWG9HN Location Part No. Description 052G 1185 56 BIG TAPE FOR LENOVO E750 750GLM90A1212N PANEL M190A1-L02 C1(C2) NB CMO U402 056G1133713(WLNMMP9MKQ2) IC PM25LV010A-100SCE SOIC-8 CBPC7MMMGNQ2 MAIN BOARD G2698-3-X-X-5-080403...