Packard Bell oneTwo M3850 User manual

Packard Bell oneTwo M3850 / oneTwo M3851 /
oneTwo L5850 / oneTwo L5851
All-In-One Computer Service Guide
PRINTED IN TAIWAN
Service guide files and updates are available
on the Acer/CSD web site; for more
information, go to http://csd.acer.com.tw

ii Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide
Revision History
Refer to the table below for changes made on this version of the Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850
/ oneTwo L5851 All-In-One Computer Service Guide.
Date Chapter Updates

Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide iii
Copyright
Copyright © 2010 by Acer Incorporated. All rights reserved. No part of this publication may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in
any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without
the prior written permission of Acer Incorporated.
Disclaimer
The information in this guide is subject to change without notice.
Acer Incorporated makes no representations or warranties, either expressed or implied, with respect to the
contents hereof and specifically disclaims any warranties of merchantability or fitness for any particular
purpose. Any Acer Incorporated software described in this guide is sold or licensed "as is". Should the
programs prove defective following their purchase, the buyer (and not Acer Incorporated, its distributor, or its
dealer) assumes the entire cost of all necessary servicing, repair, and any incidental or consequential
damages resulting from any defect in the software.
Acer is a registered trademark of Acer Incorporated.
Other brand and product names are trademarks and/or registered trademarks of their respective holders.

iv Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide
Conventions
The following textual conventions are used in this service guide.
SCREEN MESSAGES Denotes actual messages that appear on screen.
NOTE Gives additional information related to the current topic.
WARNING Alerts you to any physical risk or system damage that might result from
doing or not doing specific actions.
CAUTION Gives precautionary measures to avoid possible hardware or software
problems.
IMPORTANT Reminds you to do specific actions relevant to the accomplishment of
procedures.

Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide v
Service Guide Coverage
This Service Guide provides you with all technical information relating to the BASIC CONFIGURATION
decided for our "global" product offering. To better fit local market requirements and enhance product
competitiveness, your regional office MAY have decided to extend the functionality of a machine (e.g. add-on
card, modem, or extra memory capability). These LOCALIZED FEATURES will NOT be covered in this generic
service guide. In such cases, please contact your regional offices or the responsible personnel/channel to
provide you with further technical details.
FRU Information
Please note WHEN ORDERING FRU PARTS, that you should check the most up-to-date information available
on your regional web or channel. If, for whatever reason, a part number change is made, it will not be noted in
the printed service guide. For AUTHORIZED SERVICE PROVIDERS, your office may have a DIFFERENT
part number code to those given in the FRU list of this printed service guide. You MUST use the list provided
by your regional Acer office to order FRU parts for repair and service of customer machines.

vi Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide

vii Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide
Chapter 1 – Features and Specifications 1
System Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
System Tour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Left View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Right View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Hardware Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Chipsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
BIOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Hard Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Optical Disc Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Wireless LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Webcam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
LCD Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Power Supply Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Chapter 2 – System Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
CMOS Setup Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Accessing the Setup Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Navigating through the Setup Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Setup Utility Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Chapter 3 – System Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Disassembly Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Pre-disassembly Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Disassembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Removing the Computer Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Removing the I/O Cable Cover 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Removing the Rubber Feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Removing the Rear Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Removing the I/O Cable Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Removing the Optical Disc Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Removing the Scaler Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Removing the USB/Audio Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Removing the Wall Mount Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Removing the Hard Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Removing the Inverter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Removing the Heat Sink Fan (HSF) Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Removing the Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Removing the Memory Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Removing the Mainboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Removing the Power Supply Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Removing the Touchscreen Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Removing the Bluetooth Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Table of Contents

Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide viii
Removing the Power Button Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Removing the LCD Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Removing the Main Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Removing the LCD Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Removing the LCD Panel Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Removing the Webcam Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Removing the Capacitive LED Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Removing the Light Bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Chapter 4 – Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Hardware Diagnostic Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
System Check Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Checkpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
POST Error Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
BIOS Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Clearing CMOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Chapter 5 – System Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Mainboard Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Chapter 6 – Field Replaceable Unit (FRU) List 79
Exploded Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
FRU List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
Appendix A – Model Definitions and Configurations . . . . . . . . . . . . 88
Appendix B – Test Compatible Components . . . . . . . . . . . . . . . . . . . . 98
Approved Vendor List (AVL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
Appendix C – Online Support Information . . . . . . . . . . . . . . . . . . . . . 108
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Table of Contents

Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide 1
This chapter lists the features and specifications of the Packard Bell oneTwo M3850 / oneTwo M3851 /
oneTwo L5850 / oneTwo L5851 AIO computer.
System Features
NOTE The items listed in this section are for reference only. The exact configuration of your PC depends
on the model purchased.
Component Description
Processor • LGA 1156 socket (Socket H), 1156 pin contacts
• Supports the IntelCore i3, i5, and i7 Processors
Chipset Intel H57 Express Chipset
Memory • Number of DIMM slots: Four DDR3 DIMM slots
• Maximum memory: 8 GB (using four 2 GB modules)
PCI expansion options • One PCI Express x16 slot (for graphics card installation)
• One PCI Express x1 slot (for TV tuner card installation)
Display • ZX4950: 21.5-inch LCD panel
• ZX4951: 21.5-inch LCD touchscreen panel
• ZX6950: 23-inch LCD panel
• ZX6951: 23-inch LCD touchscreen panel
Audio • Two built-in 5W stereo speakers
• Realtek ALC662-VC0-GR 5.1 Channel High Definition Audio Codec
I/O ports • Right panel
– USB ports (two)
– Headphone jack
– Microphone jack
• Left panel
– Line-in, line-out, and microphone jacks
– USB ports (six)
– Ethernet jack (RJ-45)
– External display (VGA) port
– HDMI port
– PS/2 keyboard and mouse ports
Media storage • 3.5-inch 25.4 mm 5400/7200 rpm SATA hard disk drive (HDD)
• Slim type SATA optical disc drive (ODD)
Card reader • 9-in-1 card reader slot
• Supports MultiMediaCard (MMC), Reduced-Size MultiMediaCard
(RS-MMC), Secure Digital (SD), xD-Picture Card (xD), Secure Digital
High Capacity (SDHC), Memory Stick (MS), Memory Stick PRO
(MS PRO) cards, CompactFlash Type I and II (CF-I, CF-II), and
microdrives
Features and Specifications
Chapter 1

2 Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide
Physical Specifications
Connectivity • Wired LAN: Onboard 10/100/1000 Ethernet support
• WLAN option: Mini Card wireless network adapter (802.11 b/g/n)
• WPAN option: Bluetooth®2.1+EDR (Enhanced Data Rate)
• Integrated 2.0 MP webcam
Power supply 220 W power supply unit with PFC or non-PFC option (power factor
correction)
Operating system support • Microsoft Windows 7 (Home Premium x64/x86, Home Basic x86)
•FreeDOS
• Linux LL95
Antivirus software Norton Internet Security
Security • BIOS-based user and supervisor passwords
• Kensington lock
Power management ACPI 2.0-compliant
Aspect Description
System dimension (W × H × D) 107 × 445 × 560 mm (4.21 × 17.52 × 22.05 in)
Mainboard form factor Standard DTX
Mainboard dimensions (W × H) 200 × 244 mm
Component Description

Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide 3
System Tour
The pictures and tables in this section illustrate the physical outlook of the computer.
Front View
Item Icon Component
1Integrated webcam
2Display screen
3Speakers
4Power button/indicator
• Blue – System is in power-on mode
• Flashing blue – System is in standby mode
5Auxiliary lighting capacitive key
6LCD brightness capacitive key
7Decrease volume capacitive key
8Increase volume capacitive key
NOTE: Icons for the capacitive keys are only visible when the system
is turned on.

4 Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide
Left View
Item Icon Component Item Icon Component
1Optical disc drive (ODD) 8USB ports
2I/O cable cover 9Monitor port
39-in-1 card reader 10 HDMI port
4Line-in jack 11 PS/2 mouse port
5Line-out jack 12 PS/2 keyboard port
6Microphone jack 13 AC power jack
7Ethernet port (RJ-45)

Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide 5
Right View
Item Icon Component
1Microphone jack
2Line-out jack
3USB ports

6 Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide
Rear View
Item Icon Component
1Ventilation slots
2Mounting holes for wall mount option
3Computer stand

Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide 7
Hardware Specifications
Processor
Chipsets
BIOS
Memory
Item Specification
Intel®Core™ Intel®Pentium®
Model i3-540 i3-550 i5-650 i5-660 i5-670 G6950
Clock speed 3.06 GHz 3.2 GHz 3.2 GHz 3.33 GHz 3.46 GHz 2.8 GHz
Intel® Smart
Cache 4 MB 4 MB 4 MB 4 MB 4 MB 3 MB
Bus/core ratio 23 24 25 26 21
# of cores 2
DMI 25 GT/s
Socket LGA 1156
Package type 32 nm
Max TDP 73 W
Item Specification
System chipset Intel H57 Express Chipset
Super I/O IT8721F Super I/O IT8721F
Item Specification
BIOS chip AMI BIOS
Setup utility CMOS Setup Utility
Item Specification
Controller Integrated in the Intel processor
Number of DIMM slot 4
Maximum memory 8 GB (using four 2 GB modules)
Data rate 1333 MT/s
Supported capacities 1 or 2 GB
DIMM type 240-pin DDR3 SO-DIMM
Supported brands A-Data, Apacer, Kingston, Transcend, Unifosa, Samsung
Population rule You can install memory modules in any combination as long as they match the above
specifications.

8 Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide
Hard Disk Drive
Optical Disc Drive
Ethernet
Item Specification
Controller Integrated in the Intel H57 Express Chipset
Form factor 3.5-inch 9.5 mm
Interface SATA 2.0
Supported capacities
320 GB • Seagate Pharaoh (7200 rpm)
• HGST HDT721032SLA380 (7200 rpm)
• WD WD1600AAJS-22L7 (7200 rpm)
500 GB • WD WD5000AAKS-22M9A0 (7200 rpm)
640 GB • Seagate ST3640623AS (7200 rpm)
• HGST HDT721064SLA360 (7200 rpm)
• WD WD6400AAKS-22A7B2 (7200 rpm)
1 TB • Seagate ST31000528AS (7200 rpm)
• HGST HDT721010SLA360 (7200 rpm)
• WD WD10EADS-22M4B0 (5400 rpm) / WD1001FALS-22J7B0 (7200 rpm)
1.5 TB • Seagate ST31500341AS (7200 rpm)
• WD WD15EADS-22P8B0 (5400 rpm)
Item Specification
Controller Integrated in the Intel H57 Express Chipset
Type DVD-Super Multi double-layer or Blu-ray Disc combo drive option
Form factor Slim type
Tray height (mm)) 12.7 mm
Interface SATA
Supported models
DVD-Super Multi
double-layer drive •HLDSGT31N
• PLDS DS-8A5SH
Blu-ray Disc
combo drive • Panasonic UJ141AL/UJ240A
• HLDS CT21N
Item Specification
Controller Integrated in the Intel H57 Express Chipset
LAN protocol 10/100/1000 Mbps
LAN connector type RJ-45

Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide 9
Wireless LAN
Bluetooth
Audio
Webcam
Item Specification
Model • 802.11 b/g
– Foxconn T77H121.01 Atheros AR9285 (HB95)
• 802.11 b/g/n
– Lite-On Atheros AR9283 HB93 2X2 BGN WN6602AH
– Lite-On B853GQ400G Atheros AR9285(HB95)
– Realtek RTL8191SE 1X1 BGN (WN6605LH)
– BCM 43225 2X2 BGN (HM) T77H103.00
– Foxconn Atheros HB93 2X2 BGN (HM) WN6602A
Form factor PCIe Mini Card
Item Specification
Model Broadcom BCM2046 (Single-Chip Bluetooth EDR HCI)
Version Bluetooth 2.1 + EDR
Item Specification
Controller Realtek ALC662-VC0-GR 5.1 Channel High Definition Audio Codec
Features • Two built-in 5W stereo speakers
• Right panel audio jacks
– Headphone jack
– Microphone jack
• Left panel audio jacks
– Line-in jack
– Line-out jack
– Microphone jack
Item Specification
Resolution 2.0 MP
Supported models • Chicony CNFA21321004590L
• Park Orchid C04PL037F
• Primax 50-704A4WNT8

10 Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide
LCD Panel
Power Supply Unit
Item Specification
Model ZX4950 and ZX4951 ZX6950 and ZX6951
Screen size (diagonal, inch) 21.5-inch 23-inch
Type Wide XGA
Resolution 1920 × 1080
Backlight CCFL
Interface LVDS
Brightness (typical) 300 nits
Display colors 16.7M
Aspect ratio 16:9
Contrast ratio 1000:1
Response time (typical) 5 ms
Touchscreen • ZX4950: Yes
• ZX4951: No • ZX6950: Yes • ZX6951: No
Surface treatment AG type, 3H hard coating, Haze 25
Supported models • AUO M215HW01
• LG LM215WF1
• E-Turbo SR-215M181728D1 (touch
panel)
• AUO B173RW01
• CMO N173O6-L02
• LG LP173WD1-TLA3
• Samsung LTN173KT01-A01
Inverter board •• Darfon VZ.13156.B01
• Sumida IV30260SPEC139
Item Specification
Output (max.) 220 W
Supported models • Lite-On PS-5221-06A1 / PE-5221-08AP / PS-5221-9AE
• Delta DPS-220UB-1 A / DPS-220UB A / DPS-220UB-2 B
• Chicony CPB09-D220R / CPB09-D220A / CPB09-D220E

Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide 11
CMOS Setup Utility
CMOS Setup Utility is a hardware configuration program built into the system ROM. Since most systems are
already properly configured and optimized, there is normally no need to run this utility.
You will need to run this utility under the following conditions:
• When changing the system configuration including:
• Setting the system time and date
• Configuring the system drives and peripherals
• Specifying the boot device sequence
• Configuring the power management modes
• Setting up system passwords or making other changes to the security setup
• When trying to resolve IRQ conflicts
• When a configuration error is detected by the system and you are prompted ("Run Setup" message) to
make changes to the BIOS settings.
The Setup Utility loads the configuration values in a battery-backed nonvolatile memory called CMOS RAM.
This memory area is not part of the system RAM, which allows configuration data to be retained when power is
turned off. The values take effect when the system is booted. POST uses these values to configure the
hardware. If the values and the actual hardware do not agree, POST generates an error message. You must
run this utility to change the hardware settings from the default or current configuration.
IMPORTANT If you repeatedly receive “Run Setup” messages, the RTC battery located on the mainboard
(BT1) may be defective. In this case, the system cannot retain configuration values in CMOS.
Replace the RTC battery with a new one.
NOTE For ease of reading, CMOS Setup Utility will be simply referred to as “Setup” or “Setup Utility” in this
Service Guide.
System Utilities
Chapter 2

12 Packard Bell oneTwo M3850 / oneTwo M3851 / oneTwo L5850 / oneTwo L5851 Service Guide
Accessing the Setup Utility
1. Turn on the computer.
If the computer is already turned on, save your data and close all open applications, then restart the
computer.
2. During POST, press Delete.
If you fail to press Delete before POST is completed, you will need to restart the computer.
Use the Up/Down/Left/Right arrow keys to move between the menu options, then press Enter to execute that
option.
Some options lead to pop-up dialog boxes that prompt you to verify that you wish to execute that option. Other
options lead to dialog boxes that prompt you for information.
Some options (marked with a ) lead to submenus that enable you to change the values for the option. Use
the Up/Down/Left/Right arrow keys to scroll through the items in the submenu