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Preface LCD Computer L295T Series Service Manual...
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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.
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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 computer. The following information is included: Chapter 1, Introduction, provides general information about the location of system elements and their specifications.
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Preface Related Documents You may also need to consult the following manual for additional information: User’s Manual on CD This describes the computer’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 computer.
1: Introduction Overview This manual covers the information you need to service or upgrade the L295T LCD computer. Information about oper- ating the computer (e.g. getting started, and the Setup utility) is in the User’s Manual. Information about drivers (e.g.
Introduction System Specifications Latest Specification Information The specifications listed in this Appendix are correct at the time of going to press. Certain items (particularly processor types/speeds and CD/DVD device types) may be changed or updated due to the manufacturer's release schedule. Check with your service center for details.
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Introduction Feature Specification Memory Dual Channel Memory Expandable up to 2GB (256/ 512/ 1024 MB DDR Two 200-Pin SODIMM Sockets, Supporting DDR 333 / Modules) DDR 400 MHz Modules Only (Note: Do Not Use Other Module Types) Video Controller 865GV Integrated Chipset Shared Memory Architecture (Supports up to 64MB of Supports 3D Hardware Motion Compensation Dynamically Allocated Shared Memory as Video Memory)
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Introduction Feature Specification Communication 1000Mb Base-T Gigabit LAN Built-In (10/100Mb Base-T 802.11 b/ g Wireless LAN Module with Mini-PCI Interface Compliant) (Optional) Interchangeable V.90 (V.92 Compliant) / 56K MDC IEEE 1394 Module with Mini-PCI Interface (Optional) Modem 56K MDC Modem (V.92 Compliant) & Bluetooth Combo Module (Factory Option) Power Supports ACPI v1.0b...
Introduction External Location - Left & Right Side Views Figure 1 - 2 Left & Right Views Left Right 1. Floppy Disk Drive* 2. Hard Disk Drive (HDD) Bay 3. CD Device 4. LCD Brightness Control Knob 5. Volume Control Knob 6.
Introduction Mainboard Overview - Top Figure 1 - 4 Mainboard Over- Key Parts view - Top Key Parts 1. CPU Socket (no CPU Installed) 2. Intel Springdale- G (North Bridge) 3. RAM Sockets 4. Mini PCI Socket for WLAN or IEEE1394 5.
Introduction Mainboard Overview - Top Figure 1 - 6 Mainboard Top Cable Connectors and Switches Cable Connectors & Switches 1. Floppy Disk Drive (CN5) 2. TV Port or Touch Screen (Bluetooth use) 3. CD/DVD Device (CN7) 4. Fan Power (CN9) 5.
Disassembly 2: Disassembly Overview This chapter provides step-by-step instructions for disassembling parts and subsystems. When it comes to reassembly, reverse the procedures (unless otherwise indicated). We suggest you completely review any procedure before you take the computer apart. Procedures such as upgrading/replacing the RAM, CD device and hard disk are included in the User’s Manual but are repeated here for your convenience.
Disassembly NOTE: All disassembly procedures assume that the system is turned OFF, and disconnected from any power supply, and that all peripheral cables are disconnected (including telephone lines and network cables). Maintenance Tools The following tools are recommended when working on the computer: •...
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 components could be damaged.
Disassembly Disassembly Steps The following 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 hard disk drive assembly: To remove the floppy disk drive assembly: 1.
Disassembly Removing the Hard Disk Drive Assembly Figure 2 - 1 Hard Disk Removal 1. Turn OFF the computer and turn it around so that you may comfortably access the left side. Sequence 2. Remove screw from the HDD Bay 3.
Disassembly Removing the LCD Back Cover Figure 2 - 2 LCD Back Cover 1. Turn OFF the computer and place it with its LCD display facing down on a clean, dry, level surface. Removal 2. Remove screws from the LCD back cover and slide it up towards the top of the computer. Sequence 3.
Disassembly Removing the System Memory Figure 2 - 3 Memory Removal 1. Remove the LCD back cover (page 2 - Sequence 2. The memory sockets will be visible at point on the mainboard. 3. For each module you want to replace, gently pull the latches toward the sides of the socket to release the a.
Disassembly Removing the CPU Figure 2 - 4 CPU Removal 1. Remove the LCD back cover (page 2 - Sequence 2. Remove screw from the CPU heat sink fan unit. 3. Release the power cable from the board and lift out the CPU heat sink fan unit a.
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Disassembly 4. Press down and hold the latch (on the top of the CPU unit). Figure 2 - 5 5. You will be able to release the latch while it is held down, and then ease the bracket off the CPU unit CPU Removal 6.
Disassembly Removing the I/O Bracket Figure 2 - 6 I/O Bracket 1. Remove the LCD back cover (page 2 - Removal 2. Remove the standard screws , and use long-nosed pliers or a nutdriver to remove the hex socket connector Sequence type screws 3.
Disassembly Removing the Modem Figure 2 - 7 Modem Removal 1. Remove the LCD back cover (page 2 - 6) and I/O bracket (page 2 - 10). Sequence 2. Remove screws from the modem module and disconnect the modem cable at point 3.
Disassembly Removing the Floppy Disk Drive Assembly Figure 2 - 8 Floppy Disk Drive 1. Remove the LCD back cover (page 2 - Assembly 2. Remove screws from the floppy disk drive assembly. Removal 3. Carefully disconnect the floppy disk drive ribbon cable at point Sequence 4.
Disassembly Removing the Mini PCI I/F Module Figure 2 - 9 Mini PCI I/F Module 1. Remove the LCD back cover (page 2 - 6,). Removal 2. Release the pins at points & and carefully lift up the Mini PCI I/F module. Sequence 3.
Part Lists Appendix A: Part Lists This appendix breaks down the computer’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.
Part Lists Part List Illustration Location The following table indicates where to find the appropriate part list illustration. Part L295T - Page # Base page A - 3 Bracket page A - 4 Front page A - 5 DVD-RW page A - 6...
Schematic Diagrams Appendix B: Schematic Diagrams This appendix has circuit diagrams of the systems PCB’s: Table B - 1 Diagram - Page Diagram - Page Schematic Diagram System Block Diagram - Page B - 2 Thermal & Fan Controller - Page B - 17 CPU Prescott - 1 of 2 - Page B - 3 Cardbus PCI1520 - Page B - 18 CPU Prescott - 2 of 2 - Page B - 4...
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Schematic Diagrams System Block Diagram Sheet 1 of 29 Schematic Diagram L297T System Block Diagram POWER RTCVCC V_CORE 3 * CPUCLKC VTT1.2V LGA-775 3 * CPUCLKT DUAL2.5V 6 * PCI-33MHz CLOCK Intel Pentium 4 processor +1.5V 2 * 48MHz GENERATOR. +1.275V Prescott or Northwood 3 * 66MHz...
Schematic Diagrams CPU Prescott - 1 of 2 Sheet 2 of 29 CPU Prescott 1 of 2 HA#[3..16] HD#[0..15] HA#3 HD#0 A03# D00# HA#4 HD#1 V_CORE V_CORE V_CORE V_CORE A04# D01# HA#5 HD#2 V_CORE A05# D02# HA#6 HD#3 A06# D03# HA#7 HD#4 AH18...
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Schematic Diagrams CPU Prescott - 2 of 2 Sheet 3 of 29 VCCA_VSSA_VCOREPLL Trace width donesn't less than 12 Mil C330 1000PF AN20 As close as possible to CPU socket CPU Prescott 2 of 2 VTT1.2V CPUPWRGD R628 AG23 AN23 VTT_OL 120mA AG24...
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