Clevo N550RC N551RC service manual

N550RC / N551RC Preface Notebook Computer N550RC / N551RC Service Manual Preface I Preface Notice The company reserves the right to revise this publication or to change its contents without notice Information contained herein is for reference only and does not constitute a commitment on the part of the manufacturer or any subsequent vendor They assume no responsibility or liability for any errors or inaccuracies that may appear in this publication nor are they in anyway responsible for any loss or damage resulting from the use (or misuse) of this publication This publication and any accompanying software may not, in whole or in part, be reproduced, translated, transmitted or reduced to any machine readable form without prior consent from the vendor, manufacturer or creators of this publication, except for copies kept by the user for backup purposes Preface Brand and product names mentioned in this publication may or may not be copyrights and/or registered trademarks of their respective companies They are mentioned for identification purposes only and are not intended as an endorsement of that product or its manufacturer Version 1.0 October 2015 Trademarks Intel and Intel Core are trademarks of Intel Corporation Windows® is a registered trademark of Microsoft Corporation Other brand and product names are trademarks and /or registered trademarks of their respective companies II Preface About this Manual This manual is intended for service personnel who have completed sufficient training to undertake the maintenance and inspection of personal computers It is organized to allow you to look up basic information for servicing and/or upgrading components of the N550RC / N551RC series notebook PC The following information is included: Chapter 1, Introduction, provides general information about the location of system elements and their specifications Chapter 2, Disassembly, provides step-by-step instructions for disassembling parts and subsystems and how to upgrade elements of the system Preface Appendix A, Part Lists Appendix B, Schematic Diagrams Appendix C, Updating the FLASH ROM BIOS III Preface IMPORTANT SAFETY INSTRUCTIONS Follow basic safety precautions, including those listed below, to reduce the risk of fire, electric shock and injury to persons when using any electrical equipment: Do not use this product near water, for example near a bath tub, wash bowl, kitchen sink or laundry tub, in a wet basement or near a swimming pool Avoid using a telephone (other than a cordless type) during an electrical storm There may be a remote risk of electrical shock from lightning Do not use the telephone to report a gas leak in the vicinity of the leak Use only the power cord and batteries indicated in this manual Do not dispose of batteries in a fire They may explode Check with local codes for possible special disposal instructions This product is intended to be supplied by a Listed Power Unit as follows: Preface • AC Input of 100 - 240V, 50 - 60Hz, DC Output of 19.5V, 6.15A (120 Watts) minimum AC/DC Adapter FCC Statement This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions: This device may not cause harmful interference This device must accept any interference received, including interference that may cause undesired operation IV Preface Instructions for Care and Operation The notebook computer is quite rugged, but it can be damaged To prevent this, follow these suggestions: Don’t drop it, or expose it to shock If the computer falls, the case and the components could be damaged Do not expose the computer to any shock or vibration Do not place anything heavy on the computer Keep it dry, and don’t overheat it Keep the computer and power supply away from any kind of heating element This is an electrical appliance If water or any other liquid gets into it, the computer could be badly damaged Do not leave it in a place where foreign matter or moisture may affect the system Don’t use or store the computer in a humid environment Do not place the computer on any surface which will block the vents Preface Do not expose it to excessive heat or direct sunlight Do not place it on an unstable surface Follow the proper working procedures for the computer Shut the computer down properly and don’t forget to save your work Remember to periodically save your data as data may be lost if the battery is depleted Do not turn off the power until you properly shut down all programs Do not turn off any peripheral devices when the computer is on Do not disassemble the computer by yourself Perform routine maintenance on your computer V Preface Avoid interference Keep the computer away from high capacity transformers, electric motors, and other strong magnetic fields These can hinder proper performance and damage your data Take care when using peripheral devices Use only approved brands of peripherals Unplug the power cord before attaching peripheral devices Preface Power Safety The computer has specific power requirements:  VI • • Power Safety Warning • Before you undertake any upgrade procedures, make sure that you have turned off the power, and disconnected all peripherals and cables (including telephone lines and power cord) It is advisable to also remove your battery in order to prevent accidentally turning the machine on • • • Only use a power adapter approved for use with this computer Your AC adapter may be designed for international travel but it still requires a steady, uninterrupted power supply If you are unsure of your local power specifications, consult your service representative or local power company The power adapter may have either a 2-prong or a 3-prong grounded plug The third prong is an important safety feature; not defeat its purpose If you not have access to a compatible outlet, have a qualified electrician install one When you want to unplug the power cord, be sure to disconnect it by the plug head, not by its wire Make sure the socket and any extension cord(s) you use can support the total current load of all the connected devices Before cleaning the computer, make sure it is disconnected from any external power supplies Do not plug in the power cord if you are wet Do not use the power cord if it is broken Do not place heavy objects on the power cord Preface Battery Precautions • Only use batteries designed for this computer The wrong battery type may explode, leak or damage the computer • Do not continue to use a battery that has been dropped, or that appears damaged (e.g bent or twisted) in any way Even if the computer continues to work with a damaged battery in place, it may cause circuit damage, which may possibly result in fire • Recharge the batteries using the notebook’s system Incorrect recharging may make the battery explode • Do not try to repair a battery pack Refer any battery pack repair or replacement to your service representative or qualified service personnel • Keep children away from, and promptly dispose of a damaged battery Always dispose of batteries carefully Batteries may explode or leak if exposed to fire, or improperly handled or discarded • Keep the battery away from metal appliances • Affix tape to the battery contacts before disposing of the battery • Do not touch the battery contacts with your hands or metal objects Battery Guidelines Preface The following can also apply to any backup batteries you may have • If you not use the battery for an extended period, then remove the battery from the computer for storage • Before removing the battery for storage charge it to 60% - 70% • Check stored batteries at least every months and charge them to 60% - 70%  Battery Disposal The product that you have purchased contains a rechargeable battery The battery is recyclable At the end of its useful life, under various state and local laws, it may be illegal to dispose of this battery into the municipal waste stream Check with your local solid waste officials for details in your area for recycling options or proper disposal Caution Danger of explosion if battery is incorrectly replaced Replace only with the same or equivalent type recommended by the manufacturer Discard used battery according to the manufacturer’s instructions Battery Level Click the battery icon in the taskbar to see the current battery level and charge status A battery that drops below a level of 10% will not allow the computer to boot up Make sure that any battery that drops below 10% is recharged within one week VII Preface Related Documents You may also need to consult the following manual for additional information: User’s Manual on CD/DVD This describes the notebook PC’s features and the procedures for operating the computer and its ROM-based setup program It also describes the installation and operation of the utility programs provided with the notebook PC System Startup Remove all packing materials Place the computer on a stable surface Insert the battery and make sure it is locked in position Securely attach any peripherals you want to use with the computer (e.g keyboard and mouse) to their ports Attach the AC/DC adapter to the DC-In jack at the rear of the computer, then plug the AC power cord into an outlet, and connect the AC power cord to the AC/DC adapter Use one hand to raise the lid/LCD to a comfortable viewing angle (do not exceed 135 degrees); use the other hand (as illustrated in Figure 1) to support the base of the computer (Note: Never lift the computer by the lid/LCD) Press the power button to turn the computer “on” Preface Figure 135° Opening the Lid/LCD/ Computer with AC/DC Adapter Plugged-In  Shut Down Note that you should always shut your computer down by choosing the Shut down command in Windows (see below) This will help prevent hard disk or system problems Click the icon in the Start Screen and choose Shut down from the menu Or at the bottom of the Start Right-click the Start button Screen or the Desktop and choose Shut down or sign out > Shut down from the context menu VIII Schematic Diagrams GPU Power 1/2 C550 13 14 12 3V3_RUN *OPEN-2mm C557 EN2 VBIAS PEX_PW ROK C558 1u_6.3V_X5R_04 GPIO5_3V3_MAIN_EN GPIO5_3V3_MAIN_EN GPIO5_3V3_MAIN_EN 20,44 R376 30.1K_1%_04 C609 VCNTL POK VOUT 4A GND GND R523 Ra VFB 3.24K_1%_04 GS7166SO-R R286 10K_04 VIN R288 820K_1%_06 R371 20K_1%_04 GPIO0_GC6_FB_EN C607 U20 74AHC1G32GW U43 0.1u_10V_X7R_04 R609 0_06 15 5V C 16 EN_PSV BST TON DH VOUT LX C686 0.1u_10V_X7R_04 13 R610 *20mil_short_04 Q18 MDU5693 DUAL-PDFN56-5X6mm 12 R289 VCC ILIM R608 3.6K_1%_04 VFB VDD PGOOD DL FBVDDQ1.35V 10A 5V PJ38 R370 C DEFAULT SHORT FBVDDQ *OPEN-6mm 5.1_06 A L41 BCIHP0730-1R0M D19 *CSOD140SH C631 10 C478 1u_6.3V_X5R_04 C627 PCB Footprint = BCIHP0735A C 2.2_04 11 C624 C647 *0.1u_10V_X7R_04 C622 4.7u_25V_X5R_08 PJ36 *CV-40mil 4.7u_25V_X5R_08 GPU_PW ROK 4.7K_04 3.3V R616 *0_04 0.1u_50V_Y5V_06 44 B 3.3V R280 20,26 10K_1%_04 reserved low active control circuit 3V3_RUN R615 0_04 C636 Q34 *2SK3018S3 B PEX_PW ROK C634 Vout = 0.8V*(1+Ra/Rb) 1.059V = 0.8V*(1+3.24/10) D G S Sheet 43 of 72 GPU Power 1/2 Rb 3.3V C633 R614 R611 *10K_04 *OPEN-3mm EN *0.1u_10V_X7R_04 *0.1u_10V_X7R_04 VIN NC C46 *0.1u_10V_X7R_04 A PJ44 10u_6.3V_X5R_06 R36 10K_04 DEFAULT SHORT U22 68p_50V_NPO_04 PJ32 4.7u_6.3V_X5R_06 3.3V C39 C611 10u_6.3V_X5R_06 DGPU_PW R_EN C661 *82p_50V_NPO_04 R23 10K_04 10 0.1u_50V_Y5V_06 R612 0_04 C223 + C639 330u_2.5V_12m_6.6*6.6*4.2 220p_50V_NPO_04 C662 3.3V 14 FBVDDQ 17 1u_6.3V_X5R_04 NC PGND PGND NC G5602R41U FBVDDQ_PG R581 82.5K_1%_04 FBVDDQ EMI C594 C588 C597 C610 C613 C630 *22u_6.3V_X5R_08 *22u_6.3V_X5R_08 *22u_6.3V_X5R_08 *1000p_50V_X7R_04 *1000p_50V_X7R_04 *1000p_50V_X7R_04 D AGND 14 R296 10K_04 B.Schematic Diagrams GND GND EN1 15 100p_50V_NPO_04 C635 DEFAULT SHORT 1A C573 CT2 PEX_VDD 4A 0.1u_16V_Y5V_04 OUT2 OUT2 CT1 C552 IN2 IN2 OUT1 OUT1 C543 4.7u_6.3V_X5R_06 26,33 C553 IN1 IN1 11 1A *OPEN-2mm 5V VDDQ 1u_6.3V_X5R_04 PJ31 PEX_VDD 3.3V 0.1u_16V_Y5V_04 DEFAULT SHORT 10u_6.3V_X5R_06 0.1u_16V_Y5V_04 3V3_AON 3V3_RUN U17 EM5209 PCB Footprint = TDFN14-2X3MM-A 3.3V A 3V3_AON 1 C483 *15p_50V_NPO_04 D 15,16,17,18,19 14,20,44 14,20,25 14,15 R544 100K_1%_04 11,25,38,39,40,41,44,45,46,47,48,49 30,37,38,40,42,46,47,48,49 2,11,25,31,32,35,37,38,40,41,42,44 6,8,9,25,40,42 FBVDDQ 3V3_RUN 3V3_AON PEX_VDD VIN 5V 3.3V VDDQ ᙔ!Ϻ!ႝ!တ!!DMFWP!DP/ Title Size A3 Date: B - 44 GPU Power 1/2 [43] PWR_GPU POWER_1/2 6-71-N5500-D02A Document Number N550RC W ednesday, September 09, 2015 Sheet 43 of Rev D01 55 Schematic Diagrams GPU Power 2/2 Cold boot/Optimus: 3V3_AONĺ3V3_RUNĺNVVDDĺ PEX_VDDĺFBVDDQ The ramp time for any rail must be more than 40us and is recommended to be less than 2ms NVVDD PHASE and 3V3_RUN GC6 2.0 Exit: 3V3_RUNĺNVVDD, PEX_VDD PR196 PJ45 *CV-40mil PR197 4.7K_04 *0_04 D 20 PR194 GPU_PW R_VID 0_04 PR198 10K_04 1642_DGPU_ON 3.3V GPIO5_3V3_MAIN_EN NVVDD FOR N16_VGA 20,43 D PC138 PR195 *1500p_50V_X7R_04 *10K_04 BOOT2 2.2_04 0.22u_50V_Y5V_06 G2 PR38 GPU_HOT# 14K_1%_04 C G2 S2 PR49 10K_04 PVCC_UPI_1642 PR53 *3.9K_04 LX1_UPI_1642 18A PL7 BCIH1040-R36M C PGOOD UGATE2 17 DSBL/ISNE1 16 18 PC126 BST2_UPI 3V3_RUN A EN UGATE1 BOOST1 PSI VID REFADJ TSNS/ISEN3 GND TALERT/ISNE2 14 13 25 15 UGATE2_UPI_1642 PR168 S2 A 1u_6.3V_X5R_04 + B PQ17 *CSD87350Q5D D2 PD5 PR24 CSOD140SH PC122 100K_1%_04 *OPEN-10mm INS131838814 MLP08 COMMON S1 D2 PQ18 CSD87350Q5D LX2_UPI_1642 PR40 100K_1%_NTC_04 D1 G1 S1 *0.01u_50V_X7R_04 PRT7 INS131838878 MLP08 COMMON G1 + PJ34 Sheet 44 of 72 GPU Power 2/2 5.1_06 PC19 220p_50V_NPO_04 PR163 *1K_04 GPU_PW ROK 43 VGA for Phase ໚: ᶵᶲẞPR391, PR373, PR398, PC114, RT3, PR56, PR136, PR530, PR135, PC113,& Phase (MOS chock ) ᶲẞ:PR526ᶲẞ0ohm, PR531.PR153ෑᶲ1K,PR532ᶲẞ3.9K A A ౨ጚPin15 2Phase ᶲPR136, Phase ᶲPR532=3.9K ⊗SCP=86A) 21 11,25,38,39,40,41,43,45,46,47,48,49 11,12,13,24,34,36,37,38 2,11,25,31,32,35,37,38,40,41,42,43 14,20,43 ᙔ!Ϻ!ႝ!တ!!DMFWP!DP/ NVVDD VIN 5VS 3.3V 3V3_RUN Title Size A3 Date: [44] PWR_GPU POWER_2/2 6-71-N5500-D02A Document Number N550RC W ednesday, September 09, 2015 Sheet 44 of Rev D01 55 GPU Power 2/2 B - 45 B.Schematic Diagrams D1 EMI UGATE2_UPI_1642 PR32 *20mil_short_04 330u_2.5V_12m_6.6*6.6*4.2 15.8K_1%_04 4.7u_6.3V_X5R_06 4.7u_25V_X5R_06 PR165 5.6K_1%_04 5VS PC117 PR45 4700p_50V_X7R_04 PC123 2.2_04 PC133 4.7u_25V_X5R_06 UP1462_VREF PC124 B PHASE2 PR187 4.7u_25V_X5R_06 COMP PVCC_UPI_1642 19 4.7u_25V_X5R_06 1K_1%_04 *CV-40mil 21 20 PC119 PR172 PVCC LGATE2 VIN 0.1u_50V_Y5V_06 100_04 PJ43 FB 0_04 PC114 0_04 PR167 NV_VDD FBDRTN 220p_50V_NPO_04 22 PR50 PC109 PR171 GPU_VDD_SENSE 12 23 330u_2.5V_12m_6.6*6.6*4.2 11 GND/PWM3 + PC144 PC105 14 10 LGATE1 UP1642P TON 5.1_06 C DEFAULT SHORT 35A 330u_2.5V_V_B UP1462_FBDRTN PR170 PC129 0_04 33p_50V_NPO_04 VREF S2 PR201 PC148 9 LX1_UPI_1642 PD8 0.1u_10V_X7R_04 100_04 18A NVVDD PC147 0_04 PR182 UP1462_VREF 82K_1%_04 24 0.6V~1.2V NV_VDD PL8 BCIH1040-R36M D2 G2 S2 PHASE1 + PC17 PR179 PR51 REFIN PQ19 *CSD87350Q5D + PC97 GPU_VSS_SENSE 0_04 S1 100u_25V_6.3*6.3*5.8 *EEEFZ1E101P 14 *0.01u_50V_X7R_04 PR54 UP1462_REFIN G2 INS131840774 MLP08 COMMON G1 PQ20 CSD87350Q5D D2 + CSOD140SH PC23 S1 100u_25V_6.3*6.3*5.8 *EEEFZ1E101P 1500p_50V_04 PU9 VIN G1 PC137 0.22u_50V_Y5V_06 PC161 *0.01u_50V_X7R_04 PR192 2.2_04 PC163 18K_1%_04 PR55 *20mil_short_04 PC139 4.7u_25V_X5R_06 C PC136 D1 100u_25V_6.3*6.3*5.8 *EEEFZ1E101P UGATE1_UPI_1642 PR183 INS131840832 MLP08 COMMON PC162 EMI PC142 2K_1%_04 4.7u_25V_X5R_06 PR190 PC141 D1 UP1462_REFIN 4.7u_25V_X5R_08 20K_1%_04 *47p_50V_NPO_04 20 4.7u_25V_X5R_08 1u_6.3V_X5R_04 PR191 PC140 *0_04 NVVDD_PSI 0.1u_50V_Y5V_06 20K_1%_04 PR193 VIN 3V3_RUN PC24 PC135 *0_04 PC25 PR52 10K_04 PR199 PC143 UP1462_VREF PR200 Schematic Diagrams AC_In, Charger SMART CHARGER VA C D A FBV PR71 *20mil_short_04 33_1%_04 6-13-33R01-28C PR240 PR241 18K_1%_04 *0_04 PC204 46 PMOSFET_CONTROL# AC_IN AC_IN PR243 470K_04 33 39 AC_IN# VDD3 PR260 *51_04 PR264 *0_04 PR238 10_04 C H_PROCHOT# TOTAL_CUR PC209 PC199 24K_1%_04 47p_50V_NPO_04 1u_25V_X5R_06 PD15 ZD5245BS2 33 PC207 PR246 PR262 PR261 47K_04 10K_04 10K_04 10K_04 4.7u_6.3V_X5R_06 24.9K_1%_04 33 SMD_BAT 33 C 4,46,48 33 D D 20 PQ7 2N3904 G PQ35 2SK3018S3 VA VIN 1.0DX_VCCSTG VDD3 ᙔ!Ϻ!ႝ!တ!!DMFWP!DP/ Title [45] PWR_AC_IN,CHARGER Size Document Number Custom N550RC Date: B - 46 AC_In, Charger 33 SMC_BAT 2S / 5K / NT1912 38 11,25,38,39,40,41,43,44,46,47,48,49 BAT_DET 2S / 10K / NT1908 3S / 2K 3S/2800mAH / 4.02K 4S / 390 4,6,42 4,22,23,25,28,32,33,35,37,38,39,41,42 6-21-63900-108 B E PR267 PC221 4S/2800mAH /7.15K AC/BATL# S PR39 PC222 BAT DET(BATTERY INTERNAL) : VDD3 C AC_IN A D PC224 Option close to EC GND_SIGNAL PR236 100K_1%_04 V_BAT C VA HCB1005KF-121T20 PR239 GND_SIGNAL *0_04 PL15 10K_1%_04 GND_SIGNAL PR256 SMC_BAT PD16 PD17 PD19 PD21 PR234 0.1u_10V_X7R_04 *0_04 HCB1005KF-121T20 GND_SIGNAL PSYS PR259 PL14 1.0DX_VCCSTG Hi -Battery in Charge Low -Battery remove no charge EC GPIO PD pin PR247 SMD_BAT GNDA GNDA PSYS OZ8685 J_BAT1 50458-00801-002 PCB Footprint = 50458-008L C C 330_04 PC197 + B A A 24 25 26 20 21 22 23 27 33 LX LX LX LX LX LX PR255 IAC1 12 PROCHOT# IBSET PMON VAC 28 35 D PQ2 MTN7002ZHS3 4.7u_25V_X5R_08 100K_04 1u_25V_X5R_06 1000p_50V_X7R_04 PR253 100K_1%_04 GNDP GNDP GNDP 34 14 15 16 17 18 19 VSYS VSYS VSYS VSYS VSYS VSYS VSYS IAC ACAV COMP S PC216 10 SCL PU14 IACP 330_04 PC36 *MMSZ5232BS 30 IACM PR258 PC32 Battery Voltage: 12V~16.8V SS1040WG VAC PC217 11 SDA *MMSZ5232BS ICHM PC34 30p_50V_NPO_04 31 AC AV ICHP PC33 30p_50V_NPO_04 32 IACP 0_04 VDDP PC210 SS1040WG PR254 29 MDL914S2 IACM D PD3 G VDDP ICHM A BST PC208 PC35 30p_50V_NPO_04 G C 13 0_04 GND_SIGNAL ICHP BST PR62 0_04 C C FMS3004-AS-H PC39 4700p_50V_X7R_04 PR63 *15u_25V_6.3*4.4_C 2.2_04 + 4.7u_25V_X5R_08 PD18 PC200 6-13-R0101-15B 4.7u_25V_X5R_08 PR72 PC215 PC38 PC213 S VDD3 PRS3 0.01_1%_32 PC214 GND_SIGNAL PC211 PR60 LOT6_CHG G S PL13 BCIHP0730-4R7M 6-19-41001-739 A PD20 FMS3004-AS-H A 4700p_50V_X7R_04 PC220 0.22u_16V_Y5V_04 PR250 2.2_06 PQ6 MTN7002ZHS3 G 60.4K_1%_04 0.1u_16V_Y5V_04 *RB0540S2 1000p_50V_X7R_04 0_04 GND_SIGNAL 6-14-2R23B-01D PQ3 MTE1K0P15KN3 PD4 0.1u_50V_Y5V_06 0_04 PC223 4700p_50V_X7R_04 GND_SIGNAL PR59 300K_1%_04 PC40 1500p_50V_04 PR13 4700p_50V_X7R_04 PR4 PR10 100u_25V_6.3*6.3*5.8 EEEFZ1E101P PR5 *0_06 D PR74 A 100K_04 A C 4 PRS4 0.01_1%_32 100K_04 PD2 RB0540S2 A C BAT_VOLT 33 PQ8 MTE1K0P15KN3 PRS2 *0.01_1%_32 PC46 6-13-R0101-15B 4700p_50V_X7R_04 PR61 S 33 20K_04 15K_1%_04 VA A D VA1 PC212 C PR73 PQ9 2SK3018S3 *470K_04 P/N = 6-20-B3810-003 PCB Footprint = TDC-099DHSR2-L-005-J-1 S PR235 PRS1 *0.01_1%_32 4.7u_25V_X5R_08 0.1u_50V_Y5V_06 PR3 PR75 300K_1%_04 V_BAT PQ5 EMB20P03V 4.7u_25V_X5R_08 PC45 0.1u_50V_Y5V_06 4.7u_25V_X5R_08 1500p_50V_04 4.7u_25V_X5R_08 PC58 0.1u_50V_Y5V_06 B 0.1u_50V_Y5V_06 4.7u_25V_X5R_08 PC7 PC218 PQ1 EMB20P03V 1 TDC-099DHSR2-L-005-J Sheet 45 of 72 AC_In, Charger VA PL1 HCB2012KF-800T80 0.1u_50V_Y5V_06 B.Schematic Diagrams PC219 PQ10 EMB20P03V PL2 HCB2012KF-800T80 470K_04 PQ4 EMB20P03V G A J_DC_JACK1 PC203 VIN PR245 Rev 6-71-N5500-D02A Wednesday, September 09, 2015 Sheet 45 D01 of 55 Schematic Diagrams VCore, VCCSA ,QWHO 6. Flash.nsh The utility will then proceed to flash the BIOS You should then be prompted to press any key to restart the system or turn the power off, and then on again but make sure you remove the CD/DVD/USB flash drive from the CD/DVD drive/USB port before the computer restarts Restart the computer (booting from the HDD) With the CD/DVD/USB flash drive removed from the CD/DVD drive/USB port the computer should restart from the HDD Press F2 as the computer restarts to enter the BIOS Use the arrow keys to highlight the Exit menu Select Load Setup Defaults (or press F3) and select “Yes” to confirm the selection Press F4 to save any changes you have made and exit the BIOS to restart the computer Your computer is now running normally with the updated BIOS You may now enter the BIOS and make any changes you require to the default settings C-2 ...Preface Notebook Computer N550RC / N551RC Service Manual Preface I Preface Notice The company reserves the right to revise this publication... .C-2 Introduction Chapter 1: Introduction Overview This manual covers the information you need to service or upgrade the N550RC / N551RC series notebook computer Information about operating... User’s Manual Information about dri-vers (e.g VGA & audio) is also found in the User’s Manual The manual is shipped with the computer Operating systems (e.g Windows 8.1, etc.) have their own manuals