HP EliteBook 840 G8 Laptop – Step-by-Step Disassembly & Upgrade Guide: RAM, SSD, Battery, LCD & Motherboard
Pre-Disassembly Prep Bottom Case Removal RAM Upgrade (DDR4-3200) Dual SSD Replacement Battery Replacement LCD Screen Repair Motherboard Swap Selling Your Upgraded EliteBook
⚠️ Critical Safety Measures
Power Down Sequence :
Shut down Windows completely
Hold power button for 15 seconds to discharge
Disconnect all peripherals
ESD Protection :
Optimal Workspace Setup
Lighting :
500+ lux brightness
Shadow-free work area
Organization :
Use magnetic project mat
Create screw location diagram
Resale Documentation
Photograph original condition
Record BIOS version (F10 at startup)
Save HP upgrade policy
Pro Tip : Documenting your upgrade process increases resale value by 25% for corporate buyers according to FTC market data.
2. HP EliteBook 840 G8 Bottom Case Removal
Step 1: Screw Removal Protocol
Locate all fasteners :
7 captive screws (two lengths)
3 long (6mm) near hinges
4 short (4mm) along edges
Refer to HP service manual page 18
Proper technique :
Use magnetic T5 Torx screwdriver
Apply firm downward pressure (0.6 Nm torque)
Organize screws using magnetic mat
Step 2: Hidden Clip Release
Location
Release Method
Tool
Front edge
Insert at 30° near touchpad
0.8mm plastic spudger
Side vents
Slide horizontally toward rear
iFixit opening picks
Step 3: Safe Case Separation
Initial break :
Start near hinge area
Use suction cup for grip
Lift no more than 5mm initially
Full removal :
Maintain 25° angle during lift
Watch for fingerprint reader cable
Set aside on microfiber cloth
Common Challenges & Solutions
Stuck clips :
Apply 99% isopropyl with brush
Wait 2 minutes before retrying
Stripped screws :
Use screw extractor
Replace with HP OEM screws
Internal Layout Preview
RAM slots: Under metal shield (left side)
Primary SSD: Center with copper heatsink
Battery connector: Large white 6-pin
Pro Tip : If resistance exceeds 10N of force, stop immediately and check for missed screws - HP service manuals indicate excessive force voids warranty.
VIDEO
0:20 Bottom Case 1:44 Battery 2:25 WiFi Card 2:49 Memory RAM 3:14 Heatsink and Cooling Fan 5:00 SSD Drive Storage 6:11 Speakers 6:50 Motherboard 7:18 IO USB Audio Port Board 7:46 Hinges 8:12 DC Power Jack 8:50 Palmrest Assembly 8:55 Keyboard 9:00 Touchpad 9:15 Display Assembly
3. HP EliteBook 840 G8 RAM Upgrade Guide
RAM Specifications
Supported Type :
DDR4-3200 SODIMM (1.2V)
Max 64GB (2x32GB) capacity
Recommended Configuration :
Matched pairs for dual-channel
CL22 latency or better
Step 1: Existing RAM Removal
Access RAM Slots :
Remove metal shield (2x T5 screws)
Ground yourself before touching modules
Release Modules :
Push outward on both retention clips
Modules will pop up at 30° angle
Remove by pulling straight out
Step 2: New RAM Installation
Step
Key Detail
Warning
1. Alignment
Match notch to slot key
Never force insertion
2. Angling
Insert at 45° then press flat
Must hear audible click
3. Verification
Check in BIOS (F10 at startup)
May require BIOS reset
BIOS Optimization
Enter BIOS (F10 at startup)
Navigate to Memory Configuration
Enable XMP Profile (if available)
Set Memory Frequency to 3200MHz
Resale Value Impact
Documentation :
Save RAM purchase receipt
Include benchmark results
Listing Keywords :
"64GB Professional Upgrade"
"HP-Certified RAM"
Pro Tip : For maximum stability, install matched RAM pairs - single modules run 7-10% slower in HP's internal testing.
4. HP EliteBook 840 G8 Dual SSD Upgrade: Professional Installation Guide
SSD Compatibility Matrix
Slot
Form Factor
Interface
Recommended Models
Primary
M.2 2280
PCIe Gen4 x4
HP Z Turbo Drive G2
Secondary
M.2 2242/2280
PCIe Gen3 x2
Intel Optane H10
Primary SSD Installation (Gen4 Slot)
Remove Copper Heatsink :
Unscrew 4x T5 screws in X-pattern
Preserve thermal pad (0.5mm thickness)
SSD Replacement :
Push retention clip outward
Remove at 30° angle
Align new SSD notch to key
Reassembly :
Apply fresh thermal pad if damaged
Torque screws to 0.4 Nm
Secondary SSD Installation
Location :
Under right palm rest area
Requires removing keyboard cable
Special Considerations :
BIOS Configuration
Enable RAID Mode for dual SSDs
Disable Secure Erase if reusing drives
Set Boot Order in UEFI settings
Resale Value Optimization
Include original SSD in sale
Document benchmark results
Highlight "HP-Certified Upgrade"
Enterprise Tip : For corporate deployments, clone original HP Sure Start firmware to maintain BIOS security features.
5. HP EliteBook 840 G8 Battery Replacement: Safe Installation Guide
Battery Specifications
Model
Capacity
Part Number
Compatibility
HP Long Life
53Wh
K7B32AA
All 840 G8 models
HP High Capacity
68Wh
K7B33AA
Non-touch models only
Safe Battery Removal Process
Power Down :
Disconnect AC adapter
Hold power button for 15 seconds
Ground yourself with ESD strap
Disconnect Battery :
Locate 6-pin white connector
Use plastic spudger to release latch
Pull straight out (never sideways)
Remove Battery :
Unscrew 3x T8 screws (marked ⚡)
Apply >99% isopropyl to adhesive strips
Wait 2 minutes before lifting
New Battery Installation
Preparation :
Clean battery bay with alcohol
Remove new battery protective film
Positioning :
Align with screw holes and ports
Press firmly for adhesive contact
Final Steps :
Reinstall T8 screws (0.5 Nm torque)
Connect battery last
Battery Calibration
Charge to 100% uninterrupted
Discharge completely (until shutdown)
Recharge fully before first use
Run HP Battery Check
Warranty Considerations
Use HP Genuine Batteries to maintain warranty
Keep original battery for service requests
Document replacement date in HP PC Hardware Diagnostics
Resale Value Impact
New battery increases value by 18-25%
Include battery health report (F2 at startup)
Highlight "Genuine HP Replacement" in listings
Enterprise Tip : For fleet deployments, use HP DaaS to schedule battery replacements at 80% capacity threshold.
6. HP EliteBook 840 G8 LCD Screen Replacement: Professional Display Repair
Compatible Display Panels
Model
Resolution
Brightness
Part Number
Standard FHD
1920x1080
250 nits
L0S63AA
Low Power FHD
1920x1080
1000 nits
L0S64AA
UHD Touch
3840x2160
400 nits
L0S65AA
Step 1: Bezel Removal
Prepare Work Surface :
Use ESD-safe mat
Lay microfiber cloth to protect display
Release Bezel Clips :
Start at bottom edge with plastic opening tool
Work around perimeter (12 clip locations)
Maintain 30° angle to avoid stress marks
Step 2: LCD Disconnection
Locate Connectors :
40-pin eDP cable (center)
Touchscreen ribbon (UHD models only)
Webcam/mic cables (top edge)
Release Mechanisms :
Flip up ZIF connector locks
Use tweezers for delicate ribbons
Step 3: New Panel Installation
Alignment :
Match screw holes (4x M2.5x5mm)
Verify cable routing matches original
Connection :
Secure eDP cable first
Test before reassembly (power button + F1)
Final Assembly :
Snap bezel starting from top edge
Apply even pressure (5N max)
Display Calibration
Run HP Display Calibration
Adjust color profile in HP Display Control
Verify touch accuracy (UHD models)
Warranty Protection
Use HP Genuine Panels to maintain coverage
Document replacement with HP Hardware Diagnostics
Keep original panel for service requests
Enterprise Tip : For fleet deployments, order panels with HP DaaS to include calibration service and 3-year coverage.
7. HP EliteBook 840 G8 Motherboard Replacement: Professional Procedure
Pre-Installation Preparation
Required Tools :
T5 Torx screwdriver set
Anti-static wrist strap
Plastic spudger kit
Documentation :
Photograph all cable connections
Record BIOS version (F10 at startup)
Note motherboard part number (sticker near RAM slots)
Step 1: Full System Disassembly
Remove All Components :
Battery (3x T8 screws)
SSDs and RAM modules
Cooling fan assembly
Disconnect Board Cables :
Keyboard/touchpad ribbon (ZIF connector)
Display eDP cable (40-pin)
USB board flex cables (4x connections)
Step 2: Motherboard Extraction
Step
Key Details
Warning
1. Screw Removal
11x M2x3mm screws (varying lengths)
Note positions - 3 different sizes
2. Board Lift
30° angle from front edge first
Watch for hidden clips near ports
3. I/O Shield
Transfer to new board
Align perfectly before seating
Step 3: New Motherboard Installation
Component Transfer :
HP Sure Start firmware chip
TPM module (if separate)
Serial number sticker
Secure Installation :
Align with standoffs before screwing
Torque screws to 0.6 Nm in X-pattern
Reconnect all cables before power test
Post-Installation Procedures
Power on with F2 for diagnostics
Update BIOS to matching version
Run HP Hardware Diagnostics (F2)
Reactivate Windows with OEM key
Common Issues & Solutions
No Power :
Verify 6-pin battery connection
Check DC-in board cable
Missing Peripherals :
Reseat keyboard ribbon
Verify touchpad flex cable
Resale Value Protection
Document as "OEM Board Replacement"
Include HP diagnostic reports
Preserve original serial number
Enterprise Tip : For corporate deployments, always verify HP Manageability Engine firmware matches your organization's security policies after motherboard replacement.
8. Selling Your Upgraded HP EliteBook 840 G8: Maximize Resale Value
Optimize Your Listing
Title Keywords :
"HP EliteBook 840 G8 Business Laptop - [Your Upgrades]"
Example: "64GB RAM + 2TB SSD | 1000-nit Display"
Description Essentials :
List all upgrades with benchmark comparisons
Mention remaining HP warranty status
Include HP Performance Advisor reports
Competitive Pricing Guide
Base Value :
Check BLS electronics depreciation data
Reference eBay sold listings
Upgrade Premiums :
+25% for 32GB+ RAM
+30% for 1000-nit display
+15% for dual SSDs
Corporate Buyer Tips
Provide HP hardware diagnostics (F2 at startup)
Include original dock compatibility list
Offer bulk purchase discounts for 5+ units
Pre-Sale Security Checklist
Perform HP Secure Erase (BIOS utility)
Remove from HP Manageability systems
Reset TPM module (BIOS > Security)
Safe Shipping Methods
Use ESD-safe bags for components
Require adult signature confirmation
Document with USPS insurance
Tax Tip : Document upgrades with IRS Form 946 for potential Section 179 deductions if selling as a business.
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