Table of Contents
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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..........................................7
4.Input/Output Specification.......................................9
4.1.Input Signal Connector.........................................9
4.2.Factory Preset Display Modes.........................9
N
4.3.Panel Specification...............................................10
5.Block Diagram........................................................12
5.1.Software Flow Chart.........................................12
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.................................14
6.Schematic...........................................................16
6.1.Main Board.................................................16
6.2.Power Board.....................................................20
7.PCB Layout...........................................................22
7.1.Main Board.......................................................22
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........................................................39
SAFETY NOTICE
1
Lenovo L172
Horizontal Frequency
30-83 kHz
Page
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Summary of Contents for Lenovo L172
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Page 1: Table Of Contents
17” LCD Color Monitor Lenovo L172 Service Service Service Horizontal Frequency 30-83 kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents..……......…..1 5.2.Electrical Block Diagram…………………..…..14 Revision List.…........……..2 6.Schematic…………………........…16 Important Safety Notice.……......……..3 6.1.Main Board..........16 1.Monitor Specification......………..4 6.2.Power Board..……….…........20 2.LCD Monitor Description……………………………..5 7.PCB Layout..………………........22... -
Page 2: Revision List
17” LCD Color Monitor Lenovo L172 Revision List Revision Date Revision History TPV Model Dec-28-06 First Version Release T76CNNHQBKH12P... -
Page 3: Important Safety Notice
17” LCD Color Monitor Lenovo L172 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
17” LCD Color Monitor Lenovo L172 1. Monitor Specifications Items Descriptions Driving system TFT Color LCD Type CLAA170EA07Q Size 43.0cm (17") LCD Panel Pixel pitch 0.264mm(H) x 0.264mm (V) Viewable angle 160˚ (H) 160˚ (V) (CR≥10) Response time (type) 5 ms for CPT panel Sync. -
Page 5: Lcd Monitor Description
17” LCD Color Monitor Lenovo L172 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
17” LCD Color Monitor Lenovo L172 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: Adjusting The Picture
17” LCD Color Monitor Lenovo L172 3.3 Adjusting the Picture OSD functions... - Page 8 17” LCD Color Monitor Lenovo L172...
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Page 9: Input/Output Specification
17” LCD Color Monitor Lenovo L172 4. Input/Output Specification 4.1 Input Signal Connector Pin No. Description Pin No. Description Red Input +5VDC Green Input Logic GND Blue Input H Sync Red GND V Sync Green GND Blue GND VGA connector layout... -
Page 10: Panel Specification
17” LCD Color Monitor Lenovo L172 4.3 Panel Specification 4.3.1 General Characteristics 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 11 17” LCD Color Monitor Lenovo L172 4.3.4 Parameter guide line for CCFL Inverter TFT LCD Module: Back Light Unit:...
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Page 12: Block Diagram
17” LCD Color Monitor Lenovo L172 5. Block Diagram 5.1 Software Flow Chat... - Page 13 17” LCD Color Monitor Lenovo L172 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 14: Electrical Block Diagram
17” LCD Color Monitor Lenovo L172 5.2 Electrical Block Diagram 5.2.1 Main Board Panel Interface (CN404) Keypad Interface NT68663MEFG (CN403) (Include MCU, ADC, OSD) (U401) H-SYNC V-SYNC EEPROM AT24C16AN-10SU-2.7 Crystal 12MHz D-Sub Connector (U403) (X401) (CN405) DB15_SDA DB15_SCL EEPROM AF24BC02-S1... - Page 15 17” LCD Color Monitor Lenovo L172 5.2.2 Inverter/Power Board...
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Page 16: Schematic
17" LCD Color Monitor Lenovo L172 6. Schematic 6.1 Main Board 715G1767- 1 R496 1/16W VGA-5V C409 0.1uF/16V R416 ZD412 CN405 1/16W UDZS5.6B DB15 GND_A R441 R426 1/16W 1/16W VGA-SCL D406 GND_A VGA-SCL VGA-DET BAV99 FB401 1/16W ... - Page 17 17" LCD Color Monitor Lenovo L172 MCU-VDD Q402 LEDG R418 1/16W TCLK1M LED-Green R437 1/16W PMBS3906 Q404 TCLK1P R419 1/16W LEDA RSTn LED-Orange R438 1/16W PMBS3906 IRQn CVDD1V8 RX2+ RX2+ RX2- DVDD RX2- RX1+ RX1+ TCLK2M...
- Page 18 17" LCD Color Monitor Lenovo L172 CN404 TCLK1M TCLK1P CN406 TCLK2M TCLK2P LCD-VDD LCD-VDD LVDS TCLK1M OUTPUT TCLK1P GND_A GND_A TCLK1P TCLK1M TCLK2M TCLK2P TCLK2P TCLK2M LCD-VDD LCD-VDD GND_A 30PIN/1.0mm LCD-VDD +12V FB410 120 OHM R444 R473 C432 4.7uF/50V C423...
- Page 19 17" LCD Color Monitor Lenovo L172 FB703 U701 120 OHM MMC1085-33 DVDD VGA_3V3 CONNECTOR FOR POWER/INVERTER +12V BOARD 2.0 mm C470 0.001uF C707 C705 C701 100uF/25V 0.1uF/16V C709 0.001uF 100uF/25V R701 D701 1/16W R420 FA20-04 1/16W PANEL_IDX BL-ON...
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Page 20: Power Board
17" LCD Color Monitor Lenovo L172 6.2 Power Board 715G1813-1 L902 S901 R931 C8B-R6H spotgap_NC 2R2_1206 R900 C931 R932 680K C900 0.001uF/250V 2R2_1206 3.3nF/500V T901 R901 VAR901 C908 L901 680K +12VCC CN901 0.47uF/275V varistor_NC AC SOCKET R904 R905 C920 D931 BD901 1.5M/R1206... - Page 21 17" LCD Color Monitor Lenovo L172 PT801 C802 CN831 5pF/3KV R834 CONN +12V 6.2M 1/2W_NC C803 C801 5pF/3KV R835 10pF/6KV R831 C820 C821 R822 R823 1K 10K_1% 470uF/25V R824 C838 24:24:2400 7.5K_1%_NC C811 1000pF R836 10K_1% D833 D831 R804...
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Page 22: Pcb Layout
17" LCD Color Monitor Lenovo L172 7. PCB Layout 7.1 Main Board 715G1767-1... - Page 23 17" LCD Color Monitor Lenovo L172...
- Page 24 17" LCD Color Monitor Lenovo L172...
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Page 25: Power Board
17" LCD Color Monitor Lenovo L172 7.2 Power Board 715G1813-1... - Page 26 17" LCD Color Monitor Lenovo L172...
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Page 27: Key Board
17" LCD Color Monitor Lenovo L172 7.3 Key Board 715G1497-3... -
Page 28: Maintainability
17" LCD Color Monitor Lenovo L172 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 29: Trouble Shooting
17" LCD Color Monitor Lenovo L172 8.2 Trouble Shooting 8.2.1 Main Board (1) 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 U701 Pin2=3.3V,... - Page 30 17" LCD Color Monitor Lenovo L172 (2) No picture No picture Measure U701 PIN2=3.3V, U702 PIN2=1.8V? Replace U701, U702 X401 oscillate waveforms are normal Replace X401 Check if the sync signal from computer is output and video cable is connected normally...
- Page 31 17" LCD Color Monitor Lenovo L172 (3) White screen White screen Measure Q406 base X401 oscillate is high level? waveform is normal Replace X401 Check Q406, Q405 is broken Check reset circuit of or CN404 solder? U401 is normal Check Correspondent component.
- Page 32 17" LCD Color Monitor Lenovo L172 8.2.2 Power/Inverter Board (1) No power Check CN951 pin 6/7 = 12V? Check AC line volt 100-240V Check AC input Check the voltage of C907 (+) Check bridge rectified circuit and F901 circuit Check start voltage for the pin 8 of IC901...
- Page 33 17" LCD Color Monitor Lenovo L172 (2) Inverter Board No Power Check C811 (+) =5V Check adapter section Check ON/OFF signal Check Interface section or main board Check U811 pin 2=5V? Check Q801 Check U811 Pin1/pin15 have the output of sawtooth wave at short time...
- Page 34 17" LCD Color Monitor Lenovo L172 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= 150 ±20cd/m 3. Into Factory mode of Lenovo L172: 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 17" LCD Color Monitor Lenovo L172 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＞160cd/m 4.
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Page 37: Monitor Exploded View
17" LCD Color Monitor Lenovo L172 10. Monitor Exploded View... - Page 38 17" LCD Color Monitor Lenovo L172 Item Part Name Part No. for TPV Quantity Bezel J34G1736 FM ZL 30 LED Lens 033G4852 1 Key Pad J33G4850AB6 L Key Holder J33G4937 B6 L Key Board KEPC6QD9P Panel 750GLC70A7P13N Screw 0M1G 330 4128 CR3...
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Page 39: Bom List
045G 88525 B PE Bag 045G 88606CK2 PE BAG 045G 88626CK2 PE BAG FOR MONITOR 052G 1185 MIDDLE TAPE FOR CARTON 052G 1185 56 BIG TAPE FOR LENOVO 052G 1186 SMALL TAPE 052G 1191 GLASS CLOTH 052G 1192 GLASS CLOTH 052G... - Page 40 Q41G780060825A L172 STW Q41G780060826A warranty card Q44G7023 1 EPS(L) Q44G7023 2 EPS(R) Q52G6025 13 89 MYLAR Q70G7006608 2A L172 CD manual S95G80183619 LVDS ASS'Y 015G6210 1 BASE BRACKET 020G6007 2 Die-casting 0M1G 140 5120 SCREW 0Q1G 130 6120 SCREW (T3X6)
- Page 41 17" LCD Color Monitor Lenovo L172 CN833 033G8021 2D U 3.5mm WAFER CN831 033G8021 2D U 3.5mm WAFER 040G 45762412B CBPC LABEL 044G3231 15571 EVA WASHER 051G 6 4503 IC902 056G 139 3A PC123Y22FZOF IC902 056G 139 3B PC123 Y82FZ0F...
- Page 42 17" LCD Color Monitor Lenovo L172 PT802 080GL19T 8DN1 X'FMR DARFONTK.2006M.101 PT801 080GL19T 8DN1 X'FMR DARFONTK.2006M.101 BD901 093G 50460 10 GBU405 BD901 093G 50460 16 U4KB80R BD901 093G 50460900 BRIDEGE DIODE GBU408 LITEON D901 093G 6026T52T RECTIFIER DIODE FR107 D901...
- Page 43 17" LCD Color Monitor Lenovo L172 R406 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R405 061G0603101 RST CHIPR 100 OHM +-5% 1/10W R496 061G0603102 RST CHIP 1K 1/10W 5% R484 061G0603102 RST CHIP 1K 1/10W 5% R433 061G0603102 RST CHIP 1K 1/10W 5%...
- Page 44 17" LCD Color Monitor Lenovo L172 R456 061G0603750 RST CHIPR 75 OHM +-5% 1/10W R455 061G0603750 RST CHIPR 75 OHM +-5% 1/10W R444 061G1206301 RST CHIPR 300 OHM +-5% 1/4W R473 061G1206301 RST CHIPR 300 OHM +-5% 1/4W C429 065G0603100 31 CHIP 10PF+-0.5PF 50V NPO...
- Page 45 17" LCD Color Monitor Lenovo L172 C430 065G0603220 31 CER1 0603 NP0 50V 22P PM C412 065G0603224 17 CAP:CER 0.22UF-20%-80% 1 C403 065G0603473 32 CHIP 0.047UF 50V X7R C404 065G0603473 32 CHIP 0.047UF 50V X7R C405 065G0603473 32 CHIP 0.047UF 50V X7R...
- Page 46 17" LCD Color Monitor Lenovo L172 D701 093G2040 3F FA20-04 D702 093G2040 3F FA20-04 715G1767 1 MAIN BOARD PCB CN001 033G8032 8D WAFER 1.25MM SW005 077G 607 1 FD TACT SWITCH SW004 077G 607 1 FD TACT SWITCH SW003 077G 607 1 FD...
- Page 47 17" LCD Color Monitor Lenovo L172 IC901 056G 564911 IC TEA1532AT S08 U811 056G 608 10 0Z9938 Q874 057G 417 12 T KEC 2N3904S-RTK/PS Q801 057G 759 2 RK7002 Q871 057G 759 2 RK7002 Q880 057G 759 2 RK7002 Q881...
- Page 48 17" LCD Color Monitor Lenovo L172 R872 061G0805104 RST CHIP 100K 1/8W 5% R912 061G0805105 1MOHM 1/10W R819 061G0805105 1MOHM 1/10W R853 061G0805122 RST CHIPR 1.2 KOHM +-5% 1/8W R833 061G0805122 RST CHIPR 1.2 KOHM +-5% 1/8W R923 061G0805123 RST CHIPR 12 KOHM +-5% 1/8W...
- Page 49 17" LCD Color Monitor Lenovo L172 C832 065G0805104 22 0.1UF +-10% 25V X7R 080 C880 065G0805104 22 0.1UF +-10% 25V X7R 080 C913 065G0805104 22 0.1UF +-10% 25V X7R 080 C951 065G0805104 22 0.1UF +-10% 25V X7R 080 C955 065G0805104 22 0.1UF +-10% 25V X7R 080...
- Page 50 17" LCD Color Monitor Lenovo L172 IC941 056G 158 10 T IC AZ431AZ-AE1 TO-92 BY AAC R915 061G 17210052T 100HM 5% 1/4W R952 061G 17210052T 100HM 5% 1/4W R871 061G 17210352T CFR 10KOHM +-5% 1/4W R861 061G 20010452T 100K OHM 1/4W 1%...