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Lenovo IdeaCentre A540

1. Ensure that another person familiar with the power off controls is near you Remember Another person must be there to switch off the power if necessary Use only one hand when working with powered on electrical equipment keep the other hand in your pocket or behind your back Remember There must be a complete circuit to cause electrical shock By observing the above rule you may prevent a current from passing through your body When using a tester set the controls correctly and use the approved probe leads and accessories for that tester Stand on suitable rubber mats obtained locally if necessary to insulate you from grounds such as metal floor strips and machine frames Observe the special safety precautions when you work with very high voltages these instructions are in the safety sections of the maintenance information Use extreme care when measuring high voltages e Regularly inspect and maintain your electrical hand tools to ensure they are safe to use e Do not use worn or broken tools and testers e Never assume that power has been disconnected from a circuit First check that it has been powered off e Always look carefully for possible hazards in your work area Examples of these hazards are wet floors non grounded power extension cables conditions that may cause or allow power surges and missing safety grounds e Do not touch live electrical circuits with the reflective surface of a plastic dental mirro
2. The power control button on the device and the power switch on the power supply do not turn off the electrical current supplied to the device The device also might have more than one power cord To remove all electrical current from the device ensure that all power cords are disconnected from the power source CAUTION Do not place any object weighing more than 82 kg 180 Ibs on top of rack mounted devices 8 Lenovo A540 A740Hardware Maintenance Manual Chapter 3 General information This chapter provides general information that applies to all computer models covered by this manual Specifications This section lists the physical specifications for your computer This section lists the physical specifications for your computer Type Lenovo A540 A740 This section lists the physical specifications Environment Air temperature Operating 10 to 35C Transit 20 to 55 C Humidity Operating 35 to 80 Transit 20 to 90 40 C Altitude 86KPa to 106KPa Electrical input Input voltage 90V 264V AC Input frequency 47Hz 63Hz Copyright Lenovo 2014 9 10 Lenovo A540 A740Hardware Maintenance Manual Chapter 4 General Checkout Attention The drives in the computer you are servicing might have been rearranged or the drive startup sequence may have been changed Be extremely careful during write operations such as copying saving or formatting Data or programs can be overwritten if you select an incorre
3. Refer to Removing the rear cover Lift up the Wi Fi card to remove it from the socket Disconnect the antenna cable and data cable from the Wi Fi card To install the new Wi Fi card a Connect the antenna cable to the new Wi Fi card b Line up the new Wi Fi card with the socket snap it into position and secure it with the pins Reattach the rear cover to the LED panel Reattach the hinge to the chassis and reconnect the touch and LED panel cables to the motherboard Reattach the base cover and secure it with the screws Replacing the power switch board Note Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the power switch board Step 1 Step 2 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Unplug all power cords from electrical outlets Chapter 7 Replacing hardware 37 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 Step 10 Step 11 Step 12 Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Remove the base cover Refer to Removing the base cover Remove the hinge from the chassis Refer to Removing the h
4. 13 2 From the Setup Utility program menu select Devices 3 Select an option as follows Select USB Setup press the Enter key then select USB Functions Chapter 5 Using the Setup Utility 15 Select ATA Device Setup press the Enter key then select SATA Mode Select Audio Setup press the Enter key then select Onboard Audio Controller Select Network Setup press the Enter key then select Onboard Ethernet Support or LAN Boot Agent 4 Select Disabled or Enabled and press the Enter key 5 Return to the Lenovo BIOS Setup Utility program menu and select the Exit option 6 Select Save changes and Exit from the menu Notes a If you do not want to save the settings select Discard changes and Exit from the menu b Select IDE AHCI Mode Device driver support is required for ACHI Depending on how the hard disk image was installed changing this setting may prevent the system from booting Selecting a startup device If your computer does not boot from a device such as the CD DVD ROM drive disk or hard disk as expected follow one of the procedures below Selecting a temporary startup device Use this procedure to start up from any boot device Note Not all CDs DVDs or hard disk drives are bootable 1 Turn off your computer 2 Press and hold the F12 key then turn on the computer When the Startup Device Menu appears release the F12 key Note If the Startup Device Menu does not display using these ste
5. 24G Kemeras 2806088 2 reon SKOOOTIER 74G emeas mans DESTACA ar07 2 reon skossen ATT mans IEEE 25216000 P PETT me 2 sd ueeskeeomaao KB Metala aaas 2 reon ZTM600 246 Mouse WW sna sme 2 Teor SM 8861 Mouse improved ser 25216280 2 ETO S 861 MOIO BT improved ser 280688 fe sss Module Caran rts rap AVO ET N esee LTH EXT JN ZIZINMNINININININININITNI NIT NIT NIT NEM MIMI N9 50 Lenovo A540 A740Hardware Maintenance Manual Tr fom mwowamnoso jem TN sewer asso pester eozoseoo CE UU lance ema re Teor umecasamwny EST IN UU cover umwcasowo T ESTA N corr umecasmwomwionowos scere N ewe Toners raras N UU TT eger TT TT rwoecaso e N Teva Honcassua ss resos TN ewe Hon saracasao scoresooe N mor oso sere N Tevere ones few N ewm ones oos N A40 Coolermaster Tnermal DIS WGasker 2 sos N isan Tio Terne UNA WGasket 2 Tass N Asin Coolermaster Tnermal UMA wiGasiet Tamas N TT A740 Tasal mamal DIS WGasket a sess N TT A740 Coolermaster Thermal DIS WGasker 3 gozosao N Sdi i Ca Power Boara a n ome foe a N ABLE CTS ETT sciorssso N _ oue GABLE wvseawsooaamruo scwreses CE CEC GABLE DESTETE TES EST CE owe foe TUTTO sores N E canoeor r
6. Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Step 2 Unplug all power cords from electrical outlets Step 3 Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Step 4 Remove the base cover Refer to Removing the base cover Step 5 Remove a memory module Refer to Replacing a memory module Step 6 Remove the system fan Refer to Replacing the system fan Step 7 Remove the heat sink Refer to Replacing the heat sink Step 8 Remove all the cables connected to the motherboard 30 Lenovo A540 A740Hardware Maintenance Manual Step 9 Remove the 3 screws that secure the motherboard to the chassis and slide it out as shown Step 10 To install the new motherboard a Install the memory module to the connector on the new motherboard b Line up the new motherboard with the chassis and slide it into position Align the holes on the new motherboard with the mounting holes on the chassis and secure it to the chassis with the screws c Connect all the cables to the new motherboard Step 11 Reattach the base cover and secure it with the screws Removing the hinge from the chassis Note Turn of
7. W8P 17 4558 DIS C A740 WSP 17 4558 DIS Q WIN W TV C A740 WSP 17 4558 DIS QW TV 5B20F65655 RAM M471B5173QHO YKO 4GB D3L 1600SA4 HF 1100906 mo HMT451S6AFR8A PB 1100638 MT8KTF51264HZ 1G6E1 4GB D3L 1600SA fz 1100957 HF IEA ser N Ms 0906468 DaL enosm oos N E mam CN EEN mm N IT mW IEA mona CU WD5000LPVX 08VOT 6G 5 4K 500G 7mm HDD 16200379 E LI ST500LM012 6G 9 5mm 5 4K 500G HDD 16200387 IN Seagate Yarra 1D 6G 7 5400 500 16200626 Hitachi HTS545050A7E380 8M 5400RPM 500G 16200067 N HDD 7mm ST500LM012 BP 9 5mm 16M 5 4K 500G HDD 16200323 IN WD10JPVX 08JC3 6G 9 5 4K 1T HDD LI 16200377 IN ZIZIZ HTS541010A95680 66 9 5 4K TT O TT ST1000LM024 BP 95mm 16 Sak T n ST1000LM024 6 osm 54K iT ET Jn fine sme rra sso eoa n ooo ECT mon IN le Leon PA 1151 11V8 150w common die mnes fr aae B40 Combo Usa Taan IN RTL8729A5 VAU ibgn TAO Combo US 20200052 IN RILATZIASNAL Ta BTA0 Combo USE 20200052 IN ATLE7ZIASNAU ten Sn Combo USB 20200052 N RTL8729 5 VAU bon TAO Combo USE 20200052 IN muss Ta TAO Combo USE 20200052 INT Zz Z Z Z Z Z Z Z Z Z Z Z Z Z 48 Lenovo A540 A740Hardware Maintenance Manual CIT CTI N EU CI u over Avermedia ssa e JN X LISTRI 87R C13 AHAR XR BH 1 8 C13 RB HIRE SIE 1 8KC13 Hi ld JR AR 131049514 J1 SER IBID 1 83K C13 Hi N E JR 31049523 1 E JE EE f 21 8mCCCH E R 3102877
8. base cover Refer to Removing the base cover Step 5 Remove the hinge from the chassis Refer to Removing the hinge from the chassis Step 6 Remove the rear cover Refer to Removing the rear cover Step 7 Remove the 3 screws that secure the camera to the front bezel Step 8 Lift up the camera and disconnect the data cable from the camera Step 9 To install the new camera a Connect the data cable to the new camera b Line up the holes in the new camera with the mounting holes on the LED panel and secure it with the 3 screws Step 10 Reattach the rear cover to the LED panel Step 11 Reattach the hinge to the chassis and reconnect the touch and LED panel cables to the motherboard Step 12 Reattach the base cover and secure it with the screws Replacing the LED panel Note Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover 40 Lenovo A540 A740Hardware Maintenance Manual Note It may be helpful to place the computer face down on a soft flat surface for this procedure Lenovo recommends that you use a blanket towel or other soft cloth to protect the computer screen from scratches or other damage To replace the LED panel Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached device
9. secure it with the screws Step 11 Reattach the base cover and secure it with the screws Replacing the speaker system Note Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the speaker system Step 1 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Step 2 Unplug all power cords from electrical outlets Step 3 Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Step 4 Remove the base cover Refer to Removing the base cover Step 5 Disconnect the speaker cable from the connectors on the motherboard Chapter 7 Replacing hardware 29 Step 6 Remove the 4 screws that secure the speaker system to the motherboard Step 7 Detach the speaker from the chassis Step 8 To install the new speaker system a Attach the new speaker cable to the chassis and secure it with the 4 screws b Connect the new speaker cable to the motherboard Step 9 Reattach the base cover and secure it with the screws Replacing the motherboard Note Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the motherboard Step 1
10. to outlet Remove all cables from devices Turn device ON CAUTION When replacing the lithium battery use only Part Number 45C1566 or an equivalent type battery recommended by the manufacturer If your system has a module containing a lithium battery replace it only with the same module type made by the same manufacturer The battery contains lithium and can explode if not properly used handled or disposed of Do not e Throw into or immerse in water Heat to more than 100 C 212 F Repair or disassemble Dispose of the battery as required by local ordinances or regulations CAUTION When laser products such as CD ROMs DVD ROM drives fiber optic devices or transmitters are installed note the following Do not remove the covers Removing the covers of the laser product could result in exposure to hazardous laser radiation There are no serviceable parts inside the device Use of controls or adjustments or performance of procedures other than those specified herein might result in hazardous radiation exposure da cancer Some laser products contain an embedded Class 3A or Class 3B laser diode Note the following These diodes emit radiation when open Do not stare into the beam do not view directly with optical instruments and avoid direct exposure to the beam 218 kg 37 lbs 232 kg 70 5 Ibs 255 kg 121 2 Ibs CAUTION Use safe practices when lifting Chapter 2 Safety information 7 CAUTION
11. transform board Lift up the Wi Fi card to remove it from the transform board To install the new transform board a Install the Wi Fi card to the new transform board b Connect all the cables to the new transform board c Secure the transform board to the rear cover with the screws Reattach the rear cover to the LED panel Reattach the hinge to the chassis and reconnect the touch and LED panel cables back to the motherboard Reattach the base cover and secure it with the screws Replacing the Wi Fi card Note Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the Wi Fi card Step 1 Step 2 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Unplug all power cords from electrical outlets 36 Lenovo A540 A740Hardware Maintenance Manual Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 Step 10 Step 11 Step 12 Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Remove the base cover Refer to Removing the base cover Remove the hinge from the chassis Refer to Removing the hinge from the chassis Remove the rear cover
12. will be turned on automatically This can be either a single event a daily event or a weekly event e Wake Up on LAN This feature allows LAN adapter card to wake the System O Copyright Lenovo 2014 53
13. with locating the various connectors Remove the base cover Refer to Removing the base cover Remove the hinge from the chassis Refer to Removing the hinge from the chassis Remove the rear cover Refer to Removing the rear cover Disconnect the cable from the NFC module The NFC module is glued to the rear cover using a flat head screw driver gently to remove the module from the rear cover To install the new NFC module a Connect the cable to the new NFC module b Line up the new NFC module with the socket snap it into position Reattach the rear cover to the LED panel Reattach the hinge to the chassis and reconnect the touch and LED panel cables to the motherboard Reattach the base cover and secure it with the screws Replacing the camera Note Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the camera Chapter 7 Replacing hardware 39 Step 1 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Step 2 Unplug all power cords from electrical outlets Step 3 Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Step 4 Remove the
14. 6 EW BLA 85 Power coe o VL BEK am BS Power Cod ETA T LIST 57 C13 Ble RE 131502861 f1 GW BLI Grn VDE Power Code ss 1 Bco VDE Foverou amoa 1 HIN IE 1 82K C13 RARA 131049522 f1 RAE BE 63 k1 8m FJ J RES 31033216 la YURI 1 83K C13 DE RR 131502871 f1 O BLA BSMI Rowe Code seme T Co sos 1 ASA C13 A AERE 31502867 1 iW BLK SABS Power cod ECC 1 BERI 1 8 K C138 dE A BRE 131049509 f1 Pesi EAN p Be Br 1 SER BID 1 8K C13 MISE UR AR BLA S 6536 3L1 8m C13 IRAM ERA RAI 1 8XC1341 4 BR 17 R A8T 1 8X C13 WEA IRE E BE 8 883 1 8m C13 Brazil RO 1 5A1141 8XC130 FE il BRA 31049513 r 7 r 7 r 7 7 r 7 7 E A E fa L1 8m C13 Korea B 4X 31026351 VL BLK1 8m KTL Power Cord 31026143 Chapter 7 Replacing hardware 49 Longwell 1 8M Israel C13 power cord SERIE 1 8K C13 HH BRA ERI 18K C133 B BAR LG M 1 8X C13 BAA BRE ERE 18XC13 8 E I BR ORBE C13 A bl BRE BERI E 1 89KC138jj RE XR CBE 1 82K C13 NG IH IRA N KB amp Mouse KB amp Mouse Liteon SK 8861 US 2 4G KB Metal8 25216000 2 Mia Saan 2G G 2 Liteon SK 8861 TH 2 4G KB Metal8 25216022 2 Liteon SK 8861 CS SK 2 4G KB Metal8 25216023 ion S 891 U5 N zake Mense areo fe Teo SCESO 2 40 KG 6 aos Je NIN N N N N reon SK 3061 88 246 KB Metala ET 2 ESTA ETA je DESTE as fe IESO 2806080 fe ien sesso 2 16 keves ETT 2 ESTA ET fe ESE ET 2 IEEE ET 2 reon skessa
15. 8m UL CSA Power Cord R VL BLK1 8m UL CSA Power Cord NER B 1 8k C13 MERA LW BLK1 8m ANE Power Cord VL BLK1 8m ANE Power Cord XR BR 1 8k C13 Al LIRA LW 1 8m JAPAN Power Cord EXE 1 9KC13 A BR LIB 1 83 C13 H BIR TE JI EE 65 45 1 8mCCC ERER LX ASAP 1 8M CCC C13 power cord amp LW BLK1 8m BS Power Cord VL BLK1 8m BS Power Cord R SERRE 1 83K C13 KARA LW BLK1 8m VDE Power Cord amp VL BLK1 8m VDE Power Cord SER IBID 1 82K C13 REA BA S 6 8 3L 18m E RARO SER BR 1 8 K C13 FI E RAE LW BLK1 8m BSMI Power Cord VL BLK1 8m BSMI Power Cord SER ER 1 8 K C13 I RE LW BLK1 8m SABS Power Cord amp RAIL 1 8KC13 RI JE b RR SER IBR 1 83K C13 RIJE I BRR 44 Lenovo A540 A740Hardware Maintenance Manual EU EE B ET BEA EA EA ES pol Fn L Bei Me D oo HERD Pd Ezan LW BLK1 8m BSMI Power Cord pie i VLBLK1 8m BSMI Power Corde He ed ed ed E S 7 r S r i 7 gt S r 4 RAIL 1 85KC13 J amp UN HIRE KB amp Mouse KB amp Mouse Liteon SK 8861 US 2 4G KB Metal8 C CEE CI jem ion scssi zas emeas G a Liteon SK 8861 CS ET 2 4G KB Metal8 25216023 2 ES mee IN IEC sovoo0s fe eon skes Geze Ke Meuse ETC 2 teen SK ABS 2 4 G a icon Sensini 2 49 k Me a G a IEA 25216090 2 IEC mnes ET IET nem a IET FTIT nem a EA EC a nn score 2 6 emeas mnes lo IEC aroe fe EA G 2 EE ATT amnem 2 Chapter 7 Replacing hardware 45 B BE f 3L1 8m C13 IRAMER
16. A A A Rear CAS4OW LOGO Asso Speaker caso UPPeRCABAQNETV UPPeRCABAQW O TV Upper C A540 W O TV W O HDMLIN Lowercaas o RubberCA5a0 _HDD C A840 L R_________________ HDD SATA C A540 Panel CA540 pe iNcaso DC NCASAD A540 Taisol Thermal DIS W Gasket 2 A540 Coolermaster Thermal DIS W Gasket 2 A540 Taisol Thermal UMA W Gasket 2 A540 Coolermaster Thermal UMA W Gasket 2 A540 Deta Fan Asso Sunon Fan ETA Power Board Bracket A640 OSCABO1G TV Scalar BD CAS4OSIN Power BD C A540_________________ Power BD C AS4O W O cable I NF GA880 TV Scalar BD C AS40 W O cable WLAN C A840 Main AUX IVJACK CASIO LAER GSE 46 Lenovo A540 A740Hardware Maintenance Manual Attention Be sure to read and understand all the safety information before replacing any FRUs Notes FRUs that have a 1 or 2 in the CRU column are Customer Replaceable Units CRUS e 1 identifies parts that are fairly simple to replace requiring few or no tools e 2 identifies parts that are slightly more difficult to replace e N identifies parts that are not to be replaced by the customer FRU Description Service Part Number FRU CRU ID C A740 NOK 17 4558 DIS Q W TV Chapter 7 Replacing hardware 47 BDPLANAR C A740 W8P 17 4558 DIS Q W O TV 5B20F65674 INO BDPLANAR C A740 W8P 13 4158 DIS Q W TV 5B20F65667 INO BDPLANAR C A740 W8P 15 4258 DIS Q W TV 5B20F65660 BDPLANAR BDPLANAR C A740
17. Hinweise vom Typ ACHTUNG oder VORSICHT in dieser Dokumentation bevor Sie irgendwelche Vorg nge durchf hren Leggere le istruzioni introdotte da ATTENZIONE e PERICOLO presenti nel manuale prima di eseguire una qualsiasi delle istruzioni Certifique se de ler todas as instru es de cuidado e perigo neste manual antes de executar qualquer uma das instruc es Es importante que lea todas las declaraciones de precauci n y de peligro de este manual antes de seguir las instrucciones TUTERTULUIZ dg AROMA rl TJ JT A E HITS lo H o PUTER AL AER ARAE PUTA GERA gt O Copyright Lenovo 2014 1 2 Lenovo A540 A740Hardware Maintenance Manual Chapter 2 Safety information This chapter contains the safety information that you need to be familiar with before servicing a computer General safety Follow these rules to ensure general safety e Keep the areas around the computer clear and clean during and after maintenance e When lifting any heavy object Ensure you can stand safely without slipping Distribute the weight of the object equally across both feet Lift slowly Never move suddenly or twist when you attempt to lift gt OO N a Lift by standing or by pushing up with your leg muscles this action removes the strain from the muscles in your back Do not attempt to lift any objects that weigh more than 16 kg 35 Ib or objects that you think are too heavy for you e Do not perform any action th
18. OS Setup Utility program After you finish viewing or changing settings press the Esc key to return to the Lenovo BIOS Setup Utility program main menu You might have to press the Esc key several times Do one of the following e f you want to save the new settings select Save changes and Exit from the menu When the Save 8 reset window shows select the Yes button and then press the Enter key to exit the Lenovo BIOS Setup Utility program e f you do not want to save the settings select Discard changes and Exit from the menu When the Reset Without Saving window shows select the Yes button and then press the Enter key to exit the Lenovo BIOS Setup Utility program Chapter 5 Using the Setup Utility 17 18 Lenovo A540 A740Hardware Maintenance Manual Chapter 6 Symptom to FRU Index The Symptom to FRU index lists error symptoms and possible causes The most likely cause is listed first Always begin with Chapter 4 General Checkout on page 11 This index can also be used to help you decide which FRUs to have available when servicing a computer If you are unable to correct the problem using this index go to Undetermined problems on page 20 Notes e f you have both an error message and an incorrect audio response diagnose the error message first e f you cannot run the diagnostic tests or you get a diagnostic error code when running a test but did receive a POST error message diagnose the POST error message fir
19. ZO KANA 1 83KC 1330 A RA 131049815 1 51 1 8K C13 SN IRE 31502808 f1 RABBA 3L1 8m C13 Brazil RAE 31088784 1 BETI 1 8JK C13 EL A N HIRE 131049513 fi SER BH 1 82K C13 BH IRE 31502862 1 RA S2 fa f 3L1 8m C13 Korea Ji 9 13026351 1 XE B3 1 82K C13 Eb RAE BCF E 1 8K C133 NI HIRE 131049512 fi 37 N A8T 1 8X C13 SARER 31502800 f1 Longual 18M Denmark 1 power cod suene A KAL 1 89KC135 d BRA ERR BHL 1 82K C13 ASA IRS BERE 1 8KC 131 bl b JR AR XL RS 1 82K C13 Ht i RR m m rm r rmjrj rjrjrnrmjrnrjrnrjrnrjrnrjrnrj nrj nrjinm N N A A540 Speaker COVER Upper C A540 W TV COVER Upper C A540 W O TV COVER Upper C A540 W O TV W O HDML IN COVER Lower C A540 FOOT Rubber C A540 BRACKET HDD C A540 L R CABLE HDD SATA C A540 FOOT Panel C A540 BRACKET DC IN C A540 CABLE DC IN C A540 A540 Taisol Thermal DIS W Gasket 2 A540 Coolermaster Thermal DIS W Gasket 2 A540 Taisol Thermal UMA W Gasket 2 A540 Coolermaster Thermal UMA W Gasket 2 A540 Delta Fan A540 Sunon Fan LCD C A540 Power Board Bracket C A540 LVDS C A540 LG TV Scalar BD C A540 3IN1 Power BD C A540 Power BD C A540 W O cable NFC C A540 TV Scalar BD C A540 W 0 cable WLAN C A540 Main AUX TV JACK C A540 F TV JACK C A540 P BRACKET MECHANICAL CARDPOP CARDPOP ANTENNA CONNECTOR CONNECTOR CONNECTOR A740 FRU lists This chapter lists the information on the field replaceable units FRUs for A540 All In One computers A A A
20. at would create a hazard for the customer or would make the computer unsafe e Before you start the computer ensure that other service representatives and customer personnel are not in a position that would create a hazard for them e Place removed covers and other parts in a safe place away from all personnel while you are servicing the computer e Keep your tool case away from areas that people may walk through to ensure no one trips over it Do not wear loose clothing that can be trapped in the moving parts of a machine Ensure that your sleeves are fastened or rolled up above your elbows If your hair is long tie or fasten it back Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip approximately 8 centimeters 3 inches from the end Do not wear jewelry chains metal frame eyeglasses or metal fasteners for your clothing Remember Metal objects are good electrical conductors e Wear safety glasses when you are hammering drilling soldering cutting wire attaching springs using solvents or working in any other conditions that might be hazardous to your eyes e After service reinstall all safety shields guards labels and ground wires Replace any safety device that is worn or defective Reattach all covers correctly before returning the computer to the customer CAUTION Electrical current from power telephone and communication cables can be hazardous To avoid p
21. board and secure it to the rear cover with the 2 screws c Line up the LED panel with mounting pins on the rear cover and then slide it into position Step 11 Reattach the hinge to the chassis and reconnect the touch and LED panel cables back to the motherboard Step 12 Reattach the base cover and secure it with the screws Replacing the Transform board Note Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the transform board Step 1 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Step 2 Unplug all power cords from electrical outlets Step 3 Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Step 4 Remove the base cover Refer to Removing the base cover Step 5 Remove the hinge from the chassis Refer to Removing the hinge from the chassis Chapter 7 Replacing hardware 35 Step 6 Step 7 Step 8 Step 9 Step 10 Step 11 Step 12 Step 13 Remove the rear cover Refer to Removing the rear cover Remove the 2 screws that secure the transform board to the rear cover and then lift it up to remove it Disconnect all the cables from the
22. ct drive General error messages appear if a problem or conflict is found by an application the operating system or both For an explanation of these messages refer to the information supplied with that software package Use the following procedure to help determine the cause of the problem Power off the computer and all external devices Check all cables and power cords Set all display controls to the middle position Power on all external devices aR OO N lt Power on the computer e Look for displayed error codes e Look for readable instructions or a main menu on the display If you did not receive the correct response proceed to step 6 If you did receive the correct response proceed to step 7 6 If one of the following happens follow the instruction given e f the computer displays a POST error go to POST error codes e f the computer hangs and no error is displayed continue at step 7 7 If the test stops and you cannot continue replace the last device tested Copyright Lenovo 2014 11 12 Lenovo A540 A740Hardware Maintenance Manual Chapter 5 Using the Setup Utility The Setup Utility program is used to view and change the configuration settings of your computer regardless of which operating system you are using However the operating system settings might override any similar settings in the Setup Utility program Starting the Lenovo BIOS Setup Utility program To start the Leno
23. d or power adapter Removing the base cover Replacing the hard disk drive Replacing a memory module Replacing the system fan Replacing the heat sink Replacing the speaker system Replacing the motherboard Removing the hinge from the chassis Removing the rear cover Replacing the Transform board Replacing the Wi Fi card Replacing the power switch board Replacing the NFC module Replacing the camera Replacing the LED panel A540 FRU lists A740 FRU lists Chapter 8 General information Additional Service Information 20 20 21 21 22 22 23 24 26 27 28 29 30 31 32 35 36 37 38 39 40 42 46 53 53 iv Lenovo A540 A740Hardware Maintenance Manual Chapter 1 About this manual This manual contains service and reference information for Lenovo A540 A740 computers listed on the cover It is intended only for trained servicers who are familiar with Lenovo computer products Before servicing a Lenovo product be sure to read the Safety Information The description of the TV tuner card in this manual applies only to computers with a TV tuner card installed It does not apply to computers without a TV tuner card Important Safety Information Be sure to read all CAUTION and DANGER sections in this manual before following any of the instructions Veuillez lire toutes les consignes de type DANGER et ATTENTION du present document avant d ex cuter les instructions Lesen Sie unbedingt alle
24. drive to the motherboard Step 6 Disconnect the data and power cable from the hard disk drive Chapter 7 Replacing hardware 25 Step 7 Remove the 4 screws that secure the hard disk drive to the bracket then separate the hard disk drive from the bracket Step 8 Install the new hard disk drive as follows a Secure the new hard disk drive to the brackets with the 4 screws b Connect the data and power cable to the new hard disk drive and motherboard c Secure the new hard disk drive to chassis with the 2 screws Step 9 Reattach the base cover and secure it with the screws Replacing a memory module Attention Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace a memory module Step 1 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Step 2 Unplug all power cords from electrical outlets Step 3 Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Step 4 Remove the base cover Refer to Removing the base cover 26 Lenovo A540 A740Hardware Maintenance Manual Step 5 Push out the latches on both sides of the memory socket to release the memory module Gentl
25. e Starts video operations e Verifies that the boot drive is working POST Error Message Description Action Keyboard error Cannot initialize the keyboard Make sure the keyboard is properly connected to the computer and that no keys are held pressed during POST To purposely configure the computer without a keyboard select Keyboardless operation in Startup and set the option to Enabled The BIOS then ignores the missing keyboard during POST Reboot and Select proper Boot device or Insert Boot The BIOS was unable to find a suitable boot device Make Media in selected Boot device sure the boot drive is properly connected to the computer Make sure you have bootable media in the boot device Undetermined problems 1 Power off the computer 2 Remove or disconnect the following components if connected or installed one at a time a o 9 e G f External devices modem printer or mouse Extended video memory External Cache External Cache RAM Hard disk drive Disk drive 3 Power on the computer to re test the system 4 Repeat steps 1 through 3 until you find the failing device or component If all devices and components have been removed and the problem continues replace the system board 20 Lenovo A540 A740Hardware Maintenance Manual Chapter 7 Replacing hardware Attention Do not remove the computer cover or attempt any repair before reading the Important safety information in the Safety and War
26. e part are all at the same charge Notes 1 Use product specific ESD procedures when they exceed the requirements noted here 2 Make sure that the ESD protective devices you use have been certified ISO 9000 as fully effective When handling ESD sensitive parts Chapter 2 Safety information 5 Keep the parts in protective packages until they are inserted into the product e Avoid contact with other people while handling the part e Wear a grounded wrist strap against your skin to eliminate static on your body e Prevent the part from touching your clothing Most clothing is insulative and retains a charge even when you are wearing a wrist strap Use the black side of a grounded work mat to provide a static free work surface The mat is especially useful when handling ESD sensitive devices e Select a grounding system such as those listed below to provide protection that meets the specific service requirement Note The use of a grounding system is desirable but not required to protect against ESD damage Attach the ESD ground clip to any frame ground ground braid or green wire ground Use an ESD common ground or reference point when working on a double insulated or battery operated system You can use coax or connector outside shells on these systems Use the round ground prong of the AC plug on AC operated computers Grounding requirements Electrical grounding of the computer is required for operator safe
27. efer to Left and right view and Rear view for help with locating the various connectors Step 4 Place the computer face down on a soft flat surface then remove the 8 screws that secure the base cover to the base Chapter 7 Replacing hardware 23 H CPTI Oe O on iD coca So coca coc coca coca c Step 5 Step 6 To reattach the base cover a Line up the base cover with the base slide it back and snap it into position b Place the computer face down on a soft flat surface then secure the base cover to the base with the 8 screws Replacing the hard disk drive Attention Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the hard disk drive Step 1 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Step 2 Unplug all power cords from electrical outlets Step 3 Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Step 4 Remove the base cover Refer to Removing the base cover 24 Lenovo A540 A740Hardware Maintenance Manual Step 5 Remove the 4 screws that secure the hard disk
28. ersonal injury or equipment damage disconnect any attached power cords telecommunication cables network cables and modem cables before you open the computer covers unless instructed otherwise in the installation and configuration procedures Electrical safety O Copyright Lenovo 2014 3 Observe the following rules when working on electrical equipment Important Use only approved tools and test equipment Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents Many customers have rubber floor mats near their equipment that contain small conductive fibers to decrease electrostatic discharge e Find the room emergency power off EPO switch disconnecting switch or electrical outlet If an electrical accident occurs you can then operate the switch or unplug the power cord quickly e Do not work alone under hazardous conditions or near equipment that has hazardous voltages e Disconnect all power before Performing a mechanical inspection Working near power supplies Removing or installing Field Replaceable Units FRUs e Before you start to work on the computer unplug the power cord If you cannot unplug it ask the customer to power off the electrical outlet that supplies power to the machine and to lock the electrical outlet in the off position f you need to work on a computer that has exposed electrical circuits observe the following precautions
29. ewerencassnwo csse osoresaoa IN cale C ET IN CC canoror wvsemwsoowaorno scere N CONNEGTOR cowecron wumkcaemr ooroo N connector cowecron wamkcaeop sores N Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z PE zZ Zz Chapter 7 Replacing hardware 51 52 Lenovo A540 A740Hardware Maintenance Manual Chapter 8 General information This chapter provides general information that applies to all computer models covered by this manual Additional Service Information This chapter provides additional information that the service representative might find helpful Power management Power management reduces the power consumption of certain components of the computer such as the system power supply processor hard disk drives and some monitors Advanced configuration and power interface ACPI BIOS As this computer has an ACPI BIOS system the operating system is allowed to control the power management features of the computer and the settings for Advanced Power Management APM BIOS mode is ignored Not all operating systems support ACPI BIOS mode Automatic Power On features The Automatic Power On features within the Power Management menu allow you to enable and disable features that turn on the computer automatically e Wake Up on Alarm You can specify a date and time at which the computer
30. f the computer and wait 3 to 5 minutes to let it cool down before removing the cover To remove the hinge from the chassis Step 1 Step 2 Step 3 Step 4 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Unplug all power cords from electrical outlets Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Remove the base cover Refer to Removing the base cover Chapter 7 Replacing hardware 31 Step 5 Disconnect the touch and LED panel cables from the connectors on the motherboard Step 6 Remove the 6 screws that secure the hinge to the chassis El then raise the hinge to remove it from the chassis H 2000000 B n n 000000 00000 O Le gt e Y D Step 7 To reattach the hinge to the chassis a Line up the hinge with the chassis and slide the hinge into position b Secure the hinge to the chassis with the 6 screws c Reconnect the touch and LED panel cables to the motherboard Step 8 Reattach the base cover and secure it with the screws Removing the rear cover Note Turn off the computer and wait 3 to 5
31. inge from the chassis Remove the rear cover Refer to Removing the rear cover Remove the 4 screws that secure the power switch board to the rear cover and then release the power switch board from the locking pin Disconnect the power cable from the power switch board To install the power switch board a Connect the power cable to the new converter board b Line up the hole on the new power switch board with the mounting hole on the rear cover and secure it with the screw Reattach the rear cover to the LED panel Reattach the hinge to the chassis and reconnect the touch and LED panel cables to the motherboard Reattach the base cover and secure it with the screws Replacing the NFC module Attention Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the Bluetooth module 38 Lenovo A540 A740Hardware Maintenance Manual Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 Step 10 Step 11 Step 12 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Unplug all power cords from electrical outlets Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help
32. itor e Mechanical hazards such as loose or missing hardware The guide consists of a series of steps presented as a checklist Begin the checks with the power off and the power cord disconnected Checklist 1 Check exterior covers for damage loose broken or sharp edges 2 Power off the computer Disconnect the power cord 3 Check the power cord for a A third wire ground connector in good condition Use a meter to measure third wire ground continuity for 0 1 ohm or less between the external ground pin and frame ground b The power cord should be the appropriate type as specified in the parts listings c Insulation must not be frayed or worn 4 Remove the cover 5 Check for any obvious alterations Use good judgment as to the safety of any alterations 6 Check inside the unit for any obvious hazards such as metal filings contamination water or other liquids or signs of fire or smoke damage 7 Check for worn frayed or pinched cables 8 Check that the power supply cover fasteners screws or rivets have not been removed or tampered with Handling electrostatic discharge sensitive devices Any computer part containing transistors or integrated circuits ICs should be considered sensitive to electrostatic discharge ESD ESD damage can occur when there is a difference in charge between objects Protect against ESD damage by equalizing the charge so that the computer the part the work mat and the person handling th
33. le to replace requiring few or no tools 2 identifies parts that are slightly more difficult to replace N identifies parts that are not to be replaced by the customer FRUs FRU Description Service Part Number FRU 7 C A540 WBS 17 4558 DIS W TV C A540 W8P 17 4558 UMA W O TV 42 Lenovo A540 A740Hardware Maintenance Manual C A540 W8P 13 4158 UMA W TV 5B20F63000 C A540 W8P 15 4258 UMA W TV 5B20F62991 C A540 W8P 17 4558 UMA W TV 5B20F62980 C A540 W8P 13 4158 DIS W O TV 5B20F62969 C A540 W8P 15 4258 DIS W O TV 5B20F62996 C A540 W8P 17 4558 DIS W O TV 5B20F62976 C A540 W8P 13 4158 DIS W TV 5B20F62963 C A540 W8P 15 4258 DIS W TV 5B20F62989 C A540 W8P 17 4558 DIS W TV 5B20F62995 M471B5173QHO YKO 4GB D3L 1600S A HF 1100906 HMT451S6AFR8A PB 1100638 MT8KTF51264HZ 1G6E1 4GB D3L 1600SPX4F HF 1100957 Mic R D9QBJ 4GB D3L 1600S A fz HF 1100967 HF HF 8G Hitachi HTS545050A7E380 8M 5400RPM 500G 16200067 HDD 7mm Mic S D9QBJ 4GB D3L 1600S N fz 1100959 ES 4 UJ Chapter 7 Replacing hardware 43 RTL8821AU CG 1x1ac BT4 0 Combo USB RTL8723AS VAU 1x1bgn BT4 0 Combo USB RTL8723AS VAU 1x1bgn BT4 0 Combo USB RTL8723AS VAU 1x1bgn BT4 0 Combo USB RTL8723AS VAU 1x1bgn BT4 0 Combo USB RTL8723AS VAU 1x1bgn BT4 0 Combo USB RTL8723AS VAU 1x1bgn BT4 0 Combo USB Philips IR receiver Philips Win7 IR receiver R TV tuner Avermedia H334 DVB T Mini TV Card Avermedia H334 ATSC Mini TV Card Power Cord Power Cord LW BLK1
34. lenovo Lenovo A540 A740Hardware Maintenance Manual Machine Types FOAN A540 FOAM A740 lenovo Lenovo A540 A740 Hardware Maintenance Manual Machine Types FOAN A540 FOAM A740 First Edition March 2014 6th O Copyright Lenovo 2014 LIMITED AND RESTRICTED RIGHTS NOTICE If data or software are delivered pursuant a General Services Administration GSA contract use reproduction or disclosure is subject to restrictions set forth in Contract No GS 35F 05925 Contents Chapter 1 About this manual Important Safety Information Chapter 2 Safety information General safety Electrical safety Safety inspection guide Handling electrostatic discharge sensitive devices Grounding requirements Safety notices Chapter 3 General information Specifications Chapter 4 General Checkout Chapter 5 Using the Setup Utility Starting the Lenovo BIOS Setup Utility program Viewing and changing settings Using passwords Enabling or disabling a device Selecting a startup device Exiting the Lenovo BIOS Setup Utility program Chapter 6 Symptom to FRU Index Hard disk drive boot error Power Supply Problems O Copyright Lenovo 2014 aw wo 0 D 9 O o 11 13 13 13 13 15 16 17 19 19 19 POST error codes Undetermined problems Chapter 7 Replacing hardware General information K Replacing the keyboard and mouse Replacing the power cor
35. minutes to let it cool down before removing the cover To remove the rear cover 32 Lenovo A540 A740Hardware Maintenance Manual Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Unplug all power cords from electrical outlets Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Remove the base cover Refer to Removing the base cover Remove the hinge from the chassis Refer to Removing the hinge from the chassis Remove the 2 screws that secure the LED panel to the rear cover Chapter 7 Replacing hardware 33 Step 7 Slide the LED panel upward from the bottom with Lenovo logo of the panel 34 Lenovo A540 A740Hardware Maintenance Manual Step 8 Open up the LED panel from the bottom remove the 2 screws that secure the transform board to the rear cover El and then disconnect the 2 cables from the transform board E Step 9 Then separate the rear cover from the LED panel Step 10 To reattach the rear cover a Line up the LED panel with the rear cover reconnect the LVDS1 and LVDS2 cables to the transform board b Reattach the transform
36. ote Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the heat sink Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Unplug all power cords from electrical outlets Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Remove the base cover Refer to Removing the base cover Remove the system fan Refer to Replacing the system fan Remove the 8 screws that secure the heat sink to the motherboard 28 Lenovo A540 A740Hardware Maintenance Manual Step 7 Remove the heat sink by lifting it up Attention Place the heat sink upside down on a flat surface to prevent thermal grease from contaminating other components Attention Use an alcohol pad to wipe the thermal grease off the heat sink and CPU Step 8 Use a thermal grease syringe to place 5 drops of grease on the top of the microprocessor Each drop of grease should be 0 03ml 3 tick marks on the grease syringe Step 9 Line up the new heat sink then secure it to the motherboard with the 8 screws Step 10 Attach the system fan to the new heat sink and
37. ps repeatedly press and release the F12 key rather than keeping it pressed when turning on the computer Use f and arrows to select the desired startup device from the Startup Device Menu and press the Enter key to begin Note Selecting a startup device from the Startup Device Menu does not permanently change the startup sequence Selecting or changing the startup device sequence To view or permanently change the configured startup device sequence do the following 1 Start the Lenovo BIOS Setup Utility program see Starting the Lenovo BIOS Setup Utility program on page 13 2 From the Lenovo BIOS Setup Utility program main menu select the Startup option 3 Press the Enter key and select the devices for the Primary Boot Sequence Read the information displayed on the right side of the screen Use and Varrows to select a device Use the lt gt or lt gt keys to move a device up or down Use the x key to exclude the device from or include the device in the boot sequence Return to the Lenovo BIOS Setup Utility program menu and select the Exit option 6 Select Save changes and Exit from the menu 16 Notes Lenovo A540 A740Hardware Maintenance Manual a If you do not want to save the settings select Discard changes and Exit from the menu b If you have changed these settings and want to return to the default settings select Load Optimal Defaults from the menu Exiting the Lenovo BI
38. r This surface is conductive and touching a live circuit can cause personal injury and damage to the computer e Do not service the following parts with the power on when they are removed from their normal operating positions in a computer Power supply units Pumps Blowers and fans Motor generators and similar units This practice ensures correct grounding of the units e f an electrical accident occurs Use caution do not become a victim yourself 4 Lenovo A540 A740Hardware Maintenance Manual Switch off power Send another person to get medical aid Safety inspection guide The intent of this inspection guide is to assist you in identifying potential hazards posed by these products Each computer as it was designed and built had required safety items installed to protect users and service personnel from injury This guide addresses only those items However good judgment should be used to identify potential safety hazards due to attachment of features or options not covered by this inspection guide If any hazards are present you must determine how serious the apparent hazard could be and whether you can continue without first resolving the problem Consider the following items and the safety hazards they present e Electrical hazards especially primary power primary voltage on the frame can cause serious or fatal electrical shock e Explosive hazards such as a damaged CRT face or bulging capac
39. ranty Guide that was included with your computer To obtain copies of the Safety and Warranty Guide go to the Support Web site at http consumersupport lenovo com Note Use only parts provided by Lenovo General information Pre disassembly instructions Before starting the disassembly procedure make sure that you do the following 1 Turn off the power to the system and all peripherals 2 Unplug all power and signal cables from the computer 3 Place the system on a flat stable surface O Copyright Lenovo 2014 21 Replacing the keyboard and mouse Attention Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the keyboard and mouse Step 1 Step 2 Step 3 Step 4 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Unplug all power cords from electrical outlets Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors gt E3 Note Your keyboard will be connected to a USB connector on one side or at the rear of the computer Disconnect the defective keyboard cable from the computer and connect the new keyboard cable to the same connector No
40. rd and press the Enter key 2 The password dialog box will be displayed Type the current password and press the Enter key 3 To delete the Power On Password leave each new password line item blank then press Enter A Setup Notice confirming that changes have been saved will be displayed 4 Return to the Lenovo BIOS Setup Utility program menu and select the Exit option 5 Select Save changes and Exit from the menu Enabling or disabling a device The Devices options is used to enable or disable user access to the following devices USB Functions Select whether to enable or disable USB Universal Serial Bus functions If the functions are disabled no USB devices can be used SATA Mode When this feature is set to Disabled all devices connected to the SATA connectors e g hard disk drives or the optical disk drive are disabled and cannot be accessed Onboard Audio Controller Select whether to enable or disable the Onboard Audio Controller When this feature is set to Disabled all devices connected to the audio connectors e g headphones or a microphone are disabled and cannot be used Onboard Ethernet Controller or LAN Boot Agent Select whether to enable or disable the Onboard Ethernet Controller or select whether to enable or disable load onboard PXE Preboot Execution Environment To enable or disable a device do the following 1 Start the Setup Utility program see Starting the Setup Utility program on page
41. s Unplug all power cords from electrical outlets Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Remove the base cover Refer to Removing the base cover Remove the hinge from the chassis Refer to Removing the hinge from the chassis Remove the rear cover Refer to Removing the rear cover Remove the camera Refer to Replacing the camera Remove the LVDS cable and the camera touch backlight cables from the LED panel To install the new the LED panel a Connect the LVDS cable and the camera touch backlight cables to the connector on the new LED panel b Reattach the camera to the LED panel Step 10 Reattach the rear cover to the LED panel Step 11 Reattach the hinge to the chassis and reconnect the touch and LED panel cables to the motherboard Chapter 7 Replacing hardware 41 Step 12 Reattach the base cover and secure it with the screws A540 FRU lists This chapter lists the information on the field replaceable units FRUs for A540 All In One computers Attention Be sure to read and understand all the safety information before replacing any FRUs Notes FRUs that have a 1 or 2 in the CRU column are Customer Replaceable Units CRUS e 1 identifies parts that are fairly simp
42. s the Enter key 3 The password dialog box will be displayed Type the password then press the Enter key 4 Re type the password to confirm then press the Enter key If you typed the password correctly the password will be installed To change an Administrator Password do the following 1 Start the Lenovo BIOS Setup Utility program see Starting the Lenovo BIOS Setup Utility program on page 13 2 From the Security menu select Set Administrator Password and press the Enter key 3 The password dialog box will be displayed Type the current password then press the Enter key 4 Type the new password then press the Enter key Re type the password to confirm the new password If you typed the new password correctly the new password will be installed A Setup Noticed confirming that changes have been saved will be displayed To delete a previously set Administrator Password do the following 1 From the Security menu select Set Administrator Password and press the Enter key 2 The password dialog box will be displayed Type the current password and press the Enter key 3 To delete an Administrator Password leave each new password line item blank then press the Enter key A Setup Notice confirming that changes have been saved will be displayed 4 Return to the Lenovo BIOS Setup Utility program menu and select the Exit option 5 Select Save changes and Exit from the menu Power On Password When a Power On Password is
43. set you cannot start the Lenovo BIOS Setup Utility program until a valid password is typed from the keyboard Setting changing or deleting a Power On Password Note A password can be any combination of letters and numbers up to 16 characters a z and 0 9 14 Lenovo A540 A740Hardware Maintenance Manual To set a Power On Password do the following 1 Start the Lenovo BIOS Setup Utility program See Starting the Lenovo BIOS Setup Utility program on page 13 2 From the Security menu select Set Power On Password and press the Enter key 3 The password dialog box will be displayed Type the password then press the Enter key 4 Re type the password to confirm If you typed the password correctly the password will be installed To change a Power On Password do the following 1 Start the Lenovo BIOS Setup Utility program See Starting the Lenovo BIOS Setup Utility program on page 13 2 From the Security menu select Set Power On Password and press the Enter key 3 The password dialog box will be displayed Type the current password then press the Enter key 4 Type the new password then press the Enter key Re type the password to confirm the new password If you typed the new password correctly the new password will be installed A Setup Noticed confirming that changes have been saved will be displayed To delete a previously set Power On Password do the following 1 From the Security menu select Set Power On Passwo
44. st f you did not receive any error message look for a description of your error symptoms in the first part of this index Hard disk drive boot error A hard disk drive boot error can be caused by the following Ep L T The startup drive is not included in the boot sequence Check the configuration and ensure the startup drive is configuration in the boot sequence No operating system is installed on the boot drive Install an operating system on the boot drive The boot sector on the startup drive is corrupted The drive must be formatted Do the following 1 Attempt to back up the data on the failing hard disk drive 2 Use the operating system to format the hard disk drive The drive is defective Replace the hard disk drive Power Supply Problems Follow these procedures if you suspect there is a power supply problem Check Verify FRU Action Check that the following are properly installed Reseat connectors Power Cord e On Off Switch connector e System Board Power Supply connectors Microprocessor connections O Copyright Lenovo 2014 19 POST error codes Each time you turn the computer on it performs a series of tests to check that the system is operating correctly and that certain options are set This series of tests is called the Power On Self Test or POST POST does the following e Checks some basic motherboard operations e Checks that the memory is working correctly
45. te The mouse can be replaced using the same method Replacing the power cord or power adapter Attention Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the power cord and power adapter Step 1 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices 22 Lenovo A540 A740Hardware Maintenance Manual Step 2 Locate the connector for the power cord Refer to Rear view Step 3 Disconnect the failing power cord and adapter from the computer and connect the new power cord and adapter to the same connector Removing the base cover Note Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover Note It may be helpful to place the computer face down on a soft flat surface for this procedure Lenovo recommends that you use a blanket towel or other soft cloth to protect the computer screen from scratches or other damage To remove the base cover Step 1 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Step 2 Unplug all power cords from electrical outlets Step 3 Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer R
46. trong password that cannot be easily compromised We suggest that passwords should follow these rules e For a strong password use 7 16 characters and a mix of letters and numbers e Do not use your name or your user name e Do not use a common word or a common name e Use something significantly different from your previous password Attention Administrator and Power On passwords are not case sensitive O Copyright Lenovo 2014 13 Administrator Password Setting an Administrator Password deters unauthorized persons from changing configuration settings You might want to set an Administrator Password if you are responsible for maintaining the settings of several computers After you set an Administrator Password a password prompt is displayed every time you access the Lenovo BIOS Setup Utility program If both the Administrator and Power On Password are set you can type either password However you must use your Administrator Password to change any configuration settings Setting changing or deleting an Administrator password To set an Administrator Password do the following Note A password can be any combination of letters and numbers up to 16 characters a z and 0 9 For more information see Password considerations on page 13 1 Start the Lenovo BIOS Setup Utility program see Starting the Lenovo BIOS Setup Utility program on page 13 2 From the Security menu select Set Administrator Password and pres
47. ty and correct system function Proper grounding of the electrical outlet can be verified by a certified electrician Safety notices The CAUTION and DANGER safety notices in this section are provided in the the language of English DANGER Electrical current from power telephone and communication cables is hazardous To avoid a shock hazard Do not connect or disconnect any cables or perform installation maintenance or reconfiguration of this product during an electrical storm Connect all power cords to a properly wired and grounded electrical outlet Connect any equipment that will be attached to this product to a properly wired outlet e When possible use one hand only to connect or disconnect signal cables Never turn on any equipment when there is evidence of fire water or structural damage Disconnect the attached power cords telecommunications cables network cables and modem cables before you open the device covers unless instructed otherwise in the installation and configuration procedures Connect and disconnect cables as described in the following table when installing moving or opening covers on this product or attached devices 6 Lenovo A540 A740Hardware Maintenance Manual Turn everything OFF Turn everything OFF First attach all cables to devices First remove power cords from outlets Attach signal cables to connectors Remove signal cables from connectors Attach power cords
48. vo BIOS Setup Utility program do the following 1 If your computer is already on when you start this procedure shut down the operating system and turn off the computer 2 Press and hold the F1 key then turn on the computer When the Lenovo BIOS Setup Utility program is displayed release the F1 key Note If a Power On Password or an Administrator Password has been set the Setup Utility program menu will not be displayed until you type your password For more information see Using passwords Viewing and changing settings System configuration options are listed in the Lenovo BIOS Setup Utility program menu To view or change settings see Starting the Setup Utility program You must use the keyboard when using the Lenovo BIOS Setup Utility menu The keys used to perform various tasks are displayed on the bottom of each screen Using passwords You can use the Lenovo BIOS Setup Utility program to set passwords to prevent unauthorized persons from gaining access to your computer and data See Starting the Setup Utility program The following types of passwords are available e Administrator Password e Power On Password You do not have to set any passwords to use your computer However if you decide to set passwords read the following sections Password considerations A password can be any combination of letters and numbers up to 16 characters a z and 0 9 For security reasons it is a good idea to use a s
49. y pull the memory module upward to remove it from its socket Step 6 Align the new memory module with the memory socket then insert it and push down on the top Step 7 edge Make sure the latches lock the memory module in place Reattach the base cover and secure it with the screws Replacing the system fan Note Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover To replace the system fan Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Remove any media disks CDs DVDs or memory cards from the drives shut down the operating system and turn off the computer and all attached devices Unplug all power cords from electrical outlets Disconnect all cables attached to the computer This includes power cords input output I O cables and any other cables that are connected to the computer Refer to Left and right view and Rear view for help with locating the various connectors Remove the base cover Refer to Removing the base cover Remove the 3 screws that secure the system fan to the heat sink Disconnect the power cable from the motherboard Chapter 7 Replacing hardware 27 Step 7 Step 8 Step 9 Lift the system fan up to remove it Line up the new system fan then secure it to the heat sink and connect the new power cable to the motherboard Reattach the base cover and secure it with the screws Replacing the heat sink N

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