Dell Inspiron 3785 User manual
Inspiron 3785
Service Manual
Regulatory Model: P35E
Regulatory Type: P35E002
© 2018 - 2019 Dell Inc. Dell, EMC Dell Inc.
2019 - 06
Rev. A00
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Contents
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Prerequisites........................................................................................................................................................................ 53
Procedure.............................................................................................................................................................................53
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Procedure ............................................................................................................................................................................54
Post-requisites.....................................................................................................................................................................54
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BIOS.................................................................................................................................................. 77
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Contents 7
BIOS () ..........................................................................................................................................100
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BIOS ( USB).........................................................................................................................................................101
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WiFi............................................................................................................................................................................103
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60 Getting help and contacting Dell...............................................................................................104
8 Contents
1. Save and close all open files and exit all open applications.
2. > >
If you are using a different operating system, see the documentation of your operating system for shut-down
instructions.
3.
4. Disconnect all attached network devices and peripherals, such as keyboard, mouse, and monitor from your computer.
5. Remove any media card and optical disc from your computer, if applicable.
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1.
2.
3.
4.
5.
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www.dell.com/regulatory_compliance
Dell Dell
www.dell.com/regulatory_compliance
— ESD
ESD expansion DIMMs
ESD
Dell Dell
ESD
• – 20 ESD DIMM "No
POST/No Video"
• – 80 ESD DIMM
( "")
ESD
• ESD ESD ESD
•
•
•
ESD
,
ESD
3
11
• –
ESD ESD
ESD
• – ESD
, ESD, ,
ESD
• ESD – ESD
•– ESD
• – ESD
ESD
ESD Styrofoam 12 30
• ESD – ESD
ESD ESD ESD
ESD ESD ESD
• – ESD Dell
ESD
ESD Dell
ESD Dell
50
1.
2.
3.
4.
5.
6.
12
• Philips screwdriver #1
• Flat-head screwdriver
• Plastic scribe
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1. Screw list
Component Secured to Screw type Quantity Screw image
Base cover Palm rest and keyboard
assembly
M2x2 2
Base cover Palm rest and keyboard
assembly
M2x4 1
Base cover Palm rest and keyboard
assembly
M2.5x7 7
Screw color may
vary depending on the
configuration ordered.
Battery Palm rest and keyboard
assembly
M2x3 4
Display panel Display back-cover and
antenna assembly
M2x2 4
Fan Palm rest and keyboard
assembly
M2.5x5 3
Hard-drive assembly Palm rest and keyboard
assembly
M2x3 4
Hard-drive bracket Hard drive M3x3 4
Heat sink
For computers
shipped with
discrete graphics.
System board M2x3 3
Hinges Palm rest and keyboard
assembly
M2.5x5 5
Hinge brackets Display back-cover and
antenna assembly
M2.5x4 8
Hinge brackets Display back-cover and
antenna assembly
M2x2 2
I/O board Palm rest and keyboard
assembly
M2x4 1
5
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Component Secured to Screw type Quantity Screw image
Optical-drive bracket Optical drive M2x3 2
Optical-drive connector
board
Palm rest and keyboard
assembly
M2x2 Big Head 1
Power-adapter port Palm rest and keyboard
assembly
M2x2 1
Power-button board Palm rest and keyboard
assembly
M2x3 1
Power button with
fingerprint reader
(optional)
Palm rest and keyboard
assembly
M2x2 1
Solid-state drive Palm rest and keyboard
assembly
M2x2.2 1
System board Palm rest and keyboard
assembly
M2x4 1
Touchpad Palm rest and keyboard
assembly
M2x2 4
Wireless-card bracket System board M2x3 1
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www.dell.com/regulatory_compliance
Procedure
1. Remove the screw (M2x2) that secures the optical-drive assembly to the base cover.
2. Using a screwdriver, push the optical drive through the slot to release the optical-drive assembly out of the optical-drive bay.
3. Slide the optical-drive assembly out of the optical-drive bay.
4. Remove the two screws (M2x3) that secure the optical-drive bracket to the optical drive.
5. Remove the optical-drive bracket from optical drive.
6. Pull the optical-drive bezel carefully to remove it from the optical drive.
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Procedure
1. Align the tabs on the optical-drive bezel with the slots on the optical drive and snap the optical-drive bezel into place.
2. Align the screw holes on the optical-drive bracket with the screw holes on the optical drive.
3. Replace the two screws (M2x3) that secure the optical-drive bracket to the optical drive.
4. Slide the optical-drive assembly into the optical-drive bay.
5. Align the screw hole on the optical-drive bracket with the screw hole on the base cover.
6. Replace the screw (M2x2) that secures the optical-drive assembly to the base cover.
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Procedure
1. Loosen the four captive screws on the base cover.
2. Remove the screw (M2x4) that secures the base cover to the palm rest and keyboard assembly.
3. Remove the two screws (M2x2) that secure the base cover to the palm rest and keyboard assembly.
4. Remove the seven screws (M2.5x7) that secure the base cover to the palm rest and keyboard assembly.
5. Pry the base cover starting from the top-left corner of the computer base.
6. Lift the base cover off the palm rest and keyboard assembly.
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1
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