Clevo P870KM Service Manual
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Clevo P870KM Service Manual

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P870KM(-G)

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  • Page 1 P870KM(-G)
  • Page 3 Preface Notebook Computer P870KM(-G) Service Manual...
  • Page 4 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 ven- dor.
  • Page 5 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 P870KM(- G) series notebook PC.
  • Page 6 Preface IMPORTANT SAFETY INSTRUCTIONS Follow basic safety precautions, including those listed below, to reduce the risk of fire, electric shock and injury to per- sons when using any electrical equipment: 1. 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.

  • Page 7: Instructions For Care And Operation

    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 Do not place it on an unstable Do not place anything heavy...

  • Page 8: Power Safety

    Preface Avoid interference. Keep the computer away from high capacity transformers, electric motors, and other strong mag- netic fields. These can hinder proper performance and damage your data.  Take care when using peripheral devices. Removal Warning Use only approved brands of Unplug the power cord before When removing any peripherals.

  • Page 9: Battery Precautions

    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.

  • Page 10: System Startup

    Preface Related Documents You may also need to consult the following manual for additional information: User’s Manual on Disc This describes the notebook PC’s features and the procedures for operating the computer and its ROM-based setup pro- gram. It also describes the installation and operation of the utility programs provided with the notebook PC. System Startup 1.

  • Page 11: Table Of Contents

    Preface Contents Introduction ..........1-1 Top ....................A-3 Bottom ..................A-4 Overview ..................1-1 LCD ....................A-5 External Locator - Top View with LCD Panel Open ......1-4 MB (Dual VGA) ................A-6 External Locator - Front & Right side Views .........1-5 MB (N17E-G3) ................A-7 External Locator - Left Side &...
  • Page 12 Preface Main EC IT8587 ................B-23 Finger Sensor Board ..............B-55 Second EC IT8587 ............... B-24 Power Switch LED Board ............B-56 TPM SLB9665TT ................ B-25 Audio Codec .................B-57 CPU, VGA Fan Conn ..............B-26 Audio Board (Speaker) ..............B-58 Backlight Keyboard ..............B-27 Audio Board (Subwoofer) ............B-59 CCD, USB Charging ..............

  • Page 13: Introduction

    Chapter 1: Introduction Overview This manual covers the information you need to service or upgrade the P870KM(-G) series notebook computer. Infor- mation about operating the computer (e.g. getting started, and the Setup utility) is in the User’s Manual. Information about drivers (e.g. VGA & audio) is also found in User’s Manual. That manual is shipped with the computer.

  • Page 14: Specifications

    Introduction Specifications Processor Options Memory i7-7700K (4.20GHz)* Four 260 Pin SO-DIMM Sockets Supporting DDR4 2400MHz Memory 8MB Smart Cache, 14nm, DDR4-2400MHz, TDP 91W (The real memory operating frequency depends on the FSB i5-7600K (3.80GHz)*  of the processor.) 6MB Smart Cache, 14nm, DDR4-2400MHz, TDP 91W Memory Expandable from 8GB (minimum) up to 64GB i5-7400 (3.00GHz) Latest Specification Information...
  • Page 15 Introduction Storage Communication Power Two changeable 2.5" (6cm) 7.0mm (h)/ 9.5mm (h) SATA Built-In Qualcomm 10/100/1000Mb Base-TX Ethernet LAN Embedded 8-cell Smart Lithium-Ion Battery Pack, 89WH (Serial) Hard Disk Drives/Solid State Drives (SSD) support- 2.0M FHD PC Camera Module Dual Full Range AC/DC Adapters with the Power Converter ing RAID level 0/1 WLAN/ Bluetooth M.2 Modules: (Factory Option) Two M.2 SATA 2280 SSDs supporting...

  • Page 16: External Locator - Top View With Lcd Panel Open

    Introduction External Locator - Top View with LCD Panel Open Figure 1 Top View 1. PC Camera 2. PC Camera LED 3. Built-In Array Microphone 4. LCD 5. Speakers 6. Power Button 7. LED Indicators 8. Keyboard 9. TouchPad and Buttons 10.

  • Page 17: External Locator - Front & Right Side Views

    Introduction External Locator - Front & Right side Views Figure 2 Front Views 1. LED Power Indicators 2. Vents Front Figure 3 Right Side Views 1. USB 3.0/3.1 Port 2. Multi-in-1 Card Reader Right 3. USB 3.1 Ports 4. Mini Display Port 1 5.

  • Page 18: External Locator - Left Side & Rear View

    Introduction External Locator - Left Side & Rear View Figure 4 Left Side View 1. RJ-45 LAN Jacks 2. USB 3.0 Ports 3. Powered USB 3.0/ 3.1 Port Left 4. Line-In Jack 5. Microphone Jack 6. Line-Out Jack 7. Headphone & S/ PDIF-Out combo Jack Figure 5...

  • Page 19: External Locator - Bottom View

    Introduction External Locator - Bottom View Figure 6 Bottom View 1. Vents 2. Sub Woofer  Overheating To prevent your com- puter from overheating make sure nothing blocks the vent/fan in- takes while the com- puter is in use. External Locator - Bottom View 1 - 7...

  • Page 20: Mainboard Overview - Top (Key Parts)

    Introduction Mainboard Overview - Top (Key Parts) Figure 7 Mainboard Top Key Parts 1. Memory Slots DDR4 SO-DIMM 2. Platform Controller Hub 3. KBC ITE IT8587 1 - 8 Mainboard Overview - Top (Key Parts)

  • Page 21: Mainboard Overview - Bottom (Key Parts)

    Introduction Mainboard Overview - Bottom (Key Parts) Figure 8 Mainboard Bottom Key Parts 1. VGA-Card Connector 2. CPU Socket (no CPU installed) 3. Memory Slots DDR4 SO-DIMM (Primary) 4. Hard Disk Connector Mainboard Overview - Bottom (Key Parts) 1 - 9...

  • Page 22: Mainboard Overview - Top (Connectors)

    Introduction Mainboard Overview - Top (Connectors) Figure 9 Mainboard Top Connectors 1. RJ-45 LAN Jacks 2. USB 3.0/3.1 Ports 3. Powered USB 3.0/ 3.1 Port 4. Multi-in-1 Card Reader 5. USB 3.1 Port 6. Mini Display Port 1 7. MIni Display Port 2 8.

  • Page 23: Mainboard Overview - Bottom (Connectors)

    Introduction Mainboard Overview - Bottom (Connectors) Figure 10 Mainboard Bottom Connectors 1. HDMI-Out Port 2. USB 3.0/3.1 Port 3. DC-In Jack 4. 126 Pin Audio Connector 5. 22 Pin Audio Connector 6. Battery Connector Mainboard Overview - Bottom (Connectors) 1 - 11...
  • Page 24 Introduction 1 - 12...

  • Page 25: Disassembly

    Chapter 2: Disassembly Overview This chapter provides step-by-step instructions for disassembling the P870KM(-G) series notebook’s parts and subsys- tems. When it comes to reassembly, reverse the procedures (unless otherwise indicated). We suggest you completely review any procedure before you take the computer apart.

  • Page 26: Maintenance Tools

    Disassembly NOTE: All disassembly procedures assume that the system is turned OFF, and disconnected from any power supply (the battery is removed too). Maintenance Tools The following tools are recommended when working on the notebook PC: • M3 Philips-head screwdriver •...

  • Page 27: Maintenance Precautions

    Disassembly Maintenance Precautions  The following precautions are a reminder. To avoid personal injury or damage to the computer while performing a re- moval and/or replacement job, take the following precautions: Power Safety Warning 1. Don't drop it. Perform your repairs and/or upgrades on a stable surface. If the computer falls, the case and other Before you undertake components could be damaged.

  • Page 28: Disassembly Steps

    Disassembly Disassembly Steps The following table lists the disassembly steps, and on which page to find the related information. PLEASE PERFORM THE DISASSEMBLY STEPS IN THE ORDER INDICATED. To remove the Battery: To remove and install the Processor: 1. Remove the battery page 2 - 5 1.

  • Page 29: Removing The Battery

    Disassembly Removing the Battery Figure 1 Battery Removal 1. Turn the computer off, and turn it over. 2. Remove the screws (Figure 1a). a. Remove the screws. 3. Carefully lift the bottom case up in the direction of the arrow and remove it (Figure 1b b.
  • Page 30 Disassembly 5. Carefully remove screws (Figure 2b Figure 2 6. Lift the battery off the computer (Figure 2e Battery Removal 7. Reinsert the bottom case starting from point as shown (Figure 2f) to avoid damaging the rear eSATA/USB 3.0 (cont’d.) port.

  • Page 31: Removing The Hard Disk Drive

    Disassembly Removing the Hard Disk Drive Figure 3 HDD Assembly The hard disk drive can be taken out to accommodate other 2.5" serial (SATA) hard disk drives with a height of 7mm/ Removal 9.5mm (h). Follow your operating system’s installation instructions, and install all necessary drivers and utilities (as out- lined in Chapter 4 of the User’s Manual) when setting up a new hard disk.
  • Page 32 Disassembly 4. Slightly lift the hard disk assembly by the tab at an angle while holding the notebook in place, and pull it in the Figure 4 direction of arrow to release it (Figure 4c HDD Assembly 5. Remove the hard disk assembly out of the bay Removal (cont’d.) 6.
  • Page 33 Disassembly Hard Disk Size Note (Foam Rubber Insert) Note that the hard disks pictured on these pages are all 9.5mm(H) hard disk drives. In some cases 7mm(H) hard disk drives will be installed. Figure 5 Foam Rubber Insert for 7mm(H) HDDs •...

  • Page 34: Removing The Primary System Memory (Ram)

    Disassembly Removing the Primary System Memory (RAM) Figure 6 RAM Module The computer has four memory sockets for 260 pin Small Outline Dual In-line (SO-DIMM) DDR 4 type memory modules. Removal The total memory size is automatically detected by the POST routine once you turn on your computer. a.
  • Page 35 Disassembly 5. Pull the latches to release the second module if necessary. 6. Insert a new module holding it at about a 30° angle and fit the connectors firmly into the memory slot. 7. The module’s pin alignment will allow it to only fit one way. Make sure the module is seated as far into the slot as it will go.

  • Page 36: Removing The System Memory (Ram) From Under The Keyboard

    Disassembly Removing the System Memory (RAM) from Under the Keyboard Figure 7 Keyboard The computer has four memory sockets for 260 pin Small Outline Dual In-line (SO-DIMM) DDR 4 type memory modules. Removal The total memory size is automatically detected by the POST routine once you turn on your computer. a.
  • Page 37 Disassembly 4. Carefully lift the keyboard up, being careful not to bend the keyboard ribbon cables Figure 8 5. Disconnect the keyboard ribbon cables from the locking collar socket by using a small flat-head screw- KB & RAM Module driver to pry the locking collar pins away from the base (Figure 8c).

  • Page 38: Removing And Installing The Video Card

    Disassembly Removing and Installing the Video Card Figure 9 Video Card-2 Video Card-2 Removal Procedure Removal Procedure Turn off the computer, turn it over and remove the battery (page 2 - Remove screws from the heat sink unit in the order indicated on the label (i.e screw first through to a.
  • Page 39 Disassembly Video Card-1 Removal Procedure Figure 10 Turn off the computer, turn it over and remove the battery (page 2 - page 2 - 14 and Video card-2 ( Video Card-1 Remove screws from the heat sink unit in the order indicated on the label (i.e screw first through to Removal Procedure screw...
  • Page 40 Disassembly Installing a New Video Card Figure 11 Prepare to fit the video card into the slot by holding it at about a 30° angle (Figure 11e). Installing a New The card needs to be fully into the slot, and the video card and socket have a guide-key and pin which align to Video Card allow the card to fit securely (Figure...

  • Page 41: Removing And Installing The Processor

    Disassembly Removing and Installing the Processor Figure 12 Processor Processor Removal Procedure Removal 1. Turn off the computer, remove the battery (page 2 - 5) and video card-2 heatsink (page 2 - 14). Procedure 2. Remove screws from the heat sink unit in the order indicated on the label (i.e screw first through to screw last...
  • Page 42 Disassembly 4. Press down and hold the latch (with the latch held down you will be able to release it). 5. Move the latch and bracket fully in the direction indicated to unlock the CPU(Figure 13c). Figure 13 6. Carefully (it may be hot) lift the CPU up out of the socket (Figure 13d).
  • Page 43 Disassembly Processor Installation Procedure Figure 14 Processor 1. Insert the CPU ; pay careful attention to the pin alignment (Figure 14a), it will fit only one way (DO NOT FORCE Installation IT!). 2. Move the bracket and latch fully in the direction indicated to lock the CPU. 3.

  • Page 44: Removing The Wireless Lan Module

    Disassembly Removing the Wireless LAN Module Figure 15 1. Turn off the computer, remove the battery (page 2 - 5) and the keyboard (page 2 - Wireless LAN 2. The Wireless LAN module will be visible at point under the keyboard (Figure 15a).

  • Page 45: Wireless Lan, Combo Module Cables

    Disassembly Wireless LAN, Combo Module Cables Note that the cables for connecting to the antennae on WLAN, WLAN & Bluetooth Combo, WiGig modules are not la- belled. The cables/covers (each cable will have either a black or transparent cable cover) are color coded for identification as outlined in the table below.

  • Page 46: Removing The Wigig Module

    Disassembly Removing the WiGig Module Figure 16 1. Turn off the computer, remove the battery (page 2 - 5) and the keyboard (page 2 - WiGig Module 2. The module will be visible at point under the keyboard (Figure 16a). Removal 3.

  • Page 47: Removing The M.2 Ssd Module

    Disassembly Removing the M.2 SSD Module Figure 17 Removing the M.2 SSD-1 Module M.2 SSD-1 Module Removal 1. Turn off the computer, remove the battery (page 2 - 5), and component bay cover (page 2 - 10). 2. Locate the module; it is visible at point Figure 17a a.
  • Page 48 Disassembly Removing the M.2 SSD-2 Module Figure 18 1. Turn off the computer, and turn it over, remove the battery (page 2 - M.2 SSD-2 Module 2. Locate the module; it is visible at point Figure 18a Removal 3. Remove the screw from the SSD (Figure 18a 4.
  • Page 49 Disassembly M.2 SSD Installation Procedure Figure 19 1. Insert the module in the computer Figure 19a M.2 SSD Module 2. Tighten the screw to secure it in place (Figure 19b). Installation 3. Only place the thermal pad on the module’s chip edge as shown when using specific module (Figure 19c).
  • Page 50 Disassembly 2 - 26...

  • Page 51: Part Lists

    Part Lists Appendix A: Part Lists This appendix breaks down the P870KM(-G) series notebook’s construction into a series of illustrations. The component part numbers are indicated in the tables opposite the drawings. Note: This section indicates the manufacturer’s part numbers. Your organization may use a different system, so be sure to cross-check any relevant documentation.

  • Page 52: Part List Illustration Location

    Part Lists Part List Illustration Location The following table indicates where to find the appropriate part list illustration. Table A- 1 Part List Illustration Location Parts page A - 3 Bottom page A - 4 page A - 5 MB (Dual VGA) page A - 6 MB (N17E-G3) page A - 7...

  • Page 53: Top

    Part Lists Figure A - 1 Top A - 3...

  • Page 54: Bottom

    Part Lists Bottom Figure A - 2 Bottom A - 4 Bottom...

  • Page 55: Lcd

    Part Lists Figure A - 3 LCD A - 5...

  • Page 56: Mb (Dual Vga

    Part Lists MB (Dual VGA) Figure A - 4 MB (Dual VGA) A - 6 MB (Dual VGA)

  • Page 57: Mb (N17E-G3

    Part Lists MB (N17E-G3) Figure A - 5 MB (N17E-G3) MB (N17E-G3) A - 7...

  • Page 58: Vga (N17E-G2

    Part Lists VGA (N17E-G2) Figure A - 6 VGA (N17E-G2) A - 8...

  • Page 59: Vga (N17E-G3

    Part Lists VGA (N17E-G3) Figure A - 7 VGA (N17E-G3) VGA (N17E-G3) A - 9...

  • Page 60: Hdd

    Part Lists Figure A - 8 A - 10 HDD...

  • Page 61: Schematic Diagrams

    Schematic Diagrams Appendix B: Schematic Diagrams This appendix has circuit diagrams of the P870KM(-G) notebook’s PCB’s. The following table indicates where to find the appropriate schematic diagram. Diagram - Page Diagram - Page Diagram - Page Table B - 1...

  • Page 62: Schematic Diagrams

    Schematic Diagrams Block Diagram " " 0 ! J! $ $  .$! #-# # -# -# C        -## C# 00 0 . J! $ $  $! 1 " 1 +" J! $ $  $! - # # C +I " I 0 ! J! $ $   $! 1C +I "...

  • Page 63: Processor 1/5

    Schematic Diagrams Processor 1/5 .2G 02B($ %&'(&% > !!  " #!? $   '&   0 1 " 6 %*66 #9 $ $ $  I $ $1 &' 6 &;67 6& #5-676& #5-6 76& & &' 6 &;67 6& 5= >& ! & > >! #5-67&...

  • Page 64: Processor 2/5

    Schematic Diagrams Processor 2/5 .2G 02B($ %&'(&% 7 >F  0.  ! 0=? @A  7 3     ;   - . -  <    =   @AB#C ! > 6   9   ,  ?  0    #,:  ...

  • Page 65: Processor 3/5

    Schematic Diagrams Processor 3/5 .2G 02B($ %&'(&% 7 > !!" ? .6 6 C( &) "2$ .6 6 C( &) :2 & %*66 #9 %*66 #9 .6 6 C& .6 6 C& . & .6 6 %& " .6 6 %& : &6 C(&) &6 %#(&)  6 C(&)<...

  • Page 66: Processor 4/5

    Schematic Diagrams Processor 4/5 .2G 02B($ %&'(&% 7 > +I " ? ; +5 ; +5 %*66 #9 %*66 #9 "    " " >                ;...

  • Page 67: Processor 5/5

    Schematic Diagrams Processor 5/5 .2G 02B($ %&'(&% > 1! ? %*66 #9 9 > %*66 #9 %*66 #9 %*66 #9 " - " " >    J %   & ;6 > % & 5 " % " % " "...

  • Page 68: Ddr4 Cha So-Dimm_0

    Schematic Diagrams DDR4 CHA SO-DIMM_0 3 ,.. $   "!&   " .6 6 %& %&6 C& .6 6 C " .6 6 %8& .6 6 C& %&6 #04 & .6 6 % % 6 .6 6 C !0&4 & .6 6 %8 .6 6 C .6 6 C...

  • Page 69: Ddr4 Cha So-Dimm_1

    Schematic Diagrams DDR4 CHA SO-DIMM_1 ; 6.5. 3 ,.. 3 ,.. " $   "!&   " .6 6 % .6 6 C 2" %&6 C& " .6 6 %8 %&6 .6 6 C& 2" & & .6 6 % % 6 .6 6 C 2"...

  • Page 70: Ddr4 Chb So-Dimm_0

    Schematic Diagrams DDR4 CHB SO-DIMM_0 3 ,.. $   "!&   " .6 6 %& %&6 C& .6 6 C& 2 & " .6 6 %8& .6 6 C 2 & %&6 ; 6.5. & .6 6 % % 6 .6 6 C" 2 &...

  • Page 71: Ddr4 Chb So-Dimm_1

    Schematic Diagrams DDR4 CHB SO-DIMM_1 3 ,.. $   "!&   " .6 6 % .6 6 C& %&6 C& " .6 6 %8 %&6 .6 6 C & .6 6 % % 6 .6 6 C" & .6 6 %8 .6 6 C ; 6.5.

  • Page 72: Mxm 3.0 Master

    Schematic Diagrams MXM 3.0 Master   F!# *:  : D F#1#&*:   .7. 6 *%5C8  !&"# #=6 #=6 .7.6 8 36.7. 8 - ' ; ' ; *%6# ,56.7. 8 #5765> *%8 *%65C8 .7.6 8 36.7. *%6# ,56.7. #5765> *% #576 8 "...

  • Page 73: Mxm 3.0 Slave

    Schematic Diagrams MXM 3.0 Slave #= 6 #= 6 36.7. 8 - *%6# ,56.7. 8 #5765> *%8 *%65C8 .7. 6 *%5C8 36.7. *%6# ,56.7. #5765> *% #576 8 .7.6 8 ' ; " #=6 #=6 ;- 6 & #=6 #=6 ;- 6 6 *% #=6 #=6...

  • Page 74: Panel, Inverter

    Schematic Diagrams Panel, Inverter 1 0 +I " 1 0 +11 +" >&% '&2423 '23(? E+#56  ' ; $   %&%      #,:%   " - ;::* - 4# 6* " %6& 5 #64#  !&#% &...

  • Page 75: Hdmi

    Schematic Diagrams HDMI 4 .,6 ; ) $ 3 /, 43)@ 3/ - ! +11 +" . 6 *+ %8! . 6 *+ %8!3 E&6& ;! & . 6 *+ %! . 6 *+ %!3 "   H &% "   .

  • Page 76: Spt

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  • Page 77: Spt-H 2/7

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  • Page 78 Schematic Diagrams SPT-H 3/7 > ! F  +?   >  ,+6 9 ,+    $ @  #   !#! G # & 7, $ 3.@ @ 7 6=!(="!##!=&"'9 6 +9 !'   9"5 " $ E %6& $     !&&1 : &...

  • Page 79: Spt-H 4/7

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  • Page 80: Spt-H 5/7

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  • Page 81: Spt-H 6/7

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  • Page 82: Spt-H 7/7

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  • Page 83: Main Ec It8587

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  • Page 84: Second Ec It8587

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  • Page 85: Tpm Slb9665Tt

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  • Page 86: Cpu, Vga Fan Conn

    Schematic Diagrams CPU, VGA Fan Conn #> #? 6 1 +1 "+0 #> #? # 1 +1 "+0 > 6#=  > 6#=   & :  & $  & &  & E&6& 6 &6& 6 E&6& 6 &6&...

  • Page 87: Backlight Keyboard

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  • Page 88: Ccd, Usb Charging

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  • Page 89: Ar_Tbt

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  • Page 90: Ar_Power

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  • Page 91: Tps65982, Type C1

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  • Page 92: Tps65982, Type C2

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  • Page 93: Ps8338B+Mdp_1

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  • Page 94: Ps8338B+Mdp_2

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  • Page 95: Wlan+Bt

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  • Page 96: M.2 M Key

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  • Page 97: Rts5250

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  • Page 98: Lan_1 E2500

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  • Page 99: Lan_2 E2500

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  • Page 100: Click, Finger Conn

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  • Page 101: Hdd & Second Hdd

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  • Page 102: Usb Port

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  • Page 103: 5Vs, 3.3Vs, 1.0 V Series

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  • Page 104: 2.5V, 5Vs_2

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  • Page 105: Fan_Power 12V

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  • Page 106: Amp10V, Vccsa

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  • Page 107: Ddr4 Vddq & Vtt, Vccpll_Oc

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  • Page 108: Power Charger, Dc In

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  • Page 109: Vccio, 1.0Va

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  • Page 110: Vcore

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  • Page 111: Vcore Output Stage

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  • Page 112: Vdd3, Vdd5

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  • Page 113: Charger Led Board

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  • Page 114: Click Board

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  • Page 115: Finger Sensor Board

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  • Page 116: Power Switch Led Board

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  • Page 117: Audio Codec

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  • Page 118: Audio Board (Speaker

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  • Page 119: Audio Board (Subwoofer

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  • Page 120: Ess Dac

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  • Page 121: Hp Amp

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  • Page 122: Audio Jack

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  • Page 123: Power Sequence

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  • Page 124 Schematic Diagrams B - 64...

  • Page 125: Updating The Flash Rom Bios

    Download the BIOS computer model. 1. Go to www.clevo.com.tw and point to E-Services and click E-Channel. Note that BIOS versions 2. Use your user ID and password to access the appropriate download area (BIOS), and download the latest BIOS files...

  • Page 126: Restart Computer

    BIOS Update Use the flash tools to update the BIOS 1. Make sure you are not loading any memory management programs such as HIMEM by holding the F8 key as you see the message “Starting MS-DOS”. You will then be prompted to give “Y” or “N” responses to the programs being loaded by DOS.

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