Irobot Roomba 655 Pet Series Motherboard Replacement Repair Guide

Difficulty

Difficult

Steps

Time Required

                          2 - 3 hours

Sections

Side Brush and Back Panel
2 steps
Battery
2 steps
Front Bumper
2 steps
Front Face Plate
2 steps
Internal Faceplate
1 step
Display
2 steps
Motherboard
3 steps

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Introduction

What you need

Step 1

              Removing the Side Brush

Flip the device over onto its back.
Find the side brush, and unscrew the single screw that connects to brush motor by using the Phillips head #2 screwdriver.
This screw doesn’t completely come out of the yellow side brush.

Flip the device over onto its back.

Find the side brush, and unscrew the single screw that connects to brush motor by using the Phillips head #2 screwdriver.

This screw doesn’t completely come out of the yellow side brush.

1024

Step 2

              Removing the Back Panel

Using a Phillips #1 screwdriver, remove the four screws on the back panel.
Once the screws are loose gently pry the back plate away from the body by using the spudger tool.
The screws don’t completely come out of the panel, but it will still come apart once unscrewed.

Using a Phillips #1 screwdriver, remove the four screws on the back panel.

Once the screws are loose gently pry the back plate away from the body by using the spudger tool.

The screws don’t completely come out of the panel, but it will still come apart once unscrewed.

Step 3

              Removing the Battery

Grab the two pieces of green tape with your thumb and index finger
Pull up on the battery in an upwards direction to remove it

Grab the two pieces of green tape with your thumb and index finger

Pull up on the battery in an upwards direction to remove it

Step 4

              Battery Contact Points

These are the contact points on the Roomba for the battery
These are the contact points on the battery
If these contact points are dirty, they can be cleaned with a moist microfiber cloth (distilled water recommended)

These are the contact points on the Roomba for the battery

These are the contact points on the battery

If these contact points are dirty, they can be cleaned with a moist microfiber cloth (distilled water recommended)

Step 5

              Front Bumper

Remove the ten 11mm screws that hold the front bumper to the plastic bumper protector with your Phillips #1 screwdriver.
Pull the plastic bumper protector up and off of the bumper.

Remove the ten 11mm screws that hold the front bumper to the plastic bumper protector with your Phillips #1 screwdriver.

Pull the plastic bumper protector up and off of the bumper.

Step 6

Flip the Roomba back over, so you are viewing the top.
Pull up on the front bumper to remove it.
Be careful not to pull too hard because there is wiring attached to the bumper.
Remove the two 7mm screws with your Phillips #1 screwdriver, holding the wire sensors in place to the front bumper.

Flip the Roomba back over, so you are viewing the top.

Pull up on the front bumper to remove it.

Be careful not to pull too hard because there is wiring attached to the bumper.

Remove the two 7mm screws with your Phillips #1 screwdriver, holding the wire sensors in place to the front bumper.

Step 7

              Front Face Plate

Remove the dust bin by pushing on the button for the dust bin removal
Pull the dust bin out

Remove the dust bin by pushing on the button for the dust bin removal

Pull the dust bin out

Step 8

Pull up on the silver handle to release the top protectant plastic
Remove the top plastic carefully

Pull up on the silver handle to release the top protectant plastic

Remove the top plastic carefully

Step 9

              Internal Faceplate

The outside six - 10mm screws and the inside set of four - 10mm screws are the same here, use your Phillips head #2 to remove them
Use your Phillips head #0 to remove the one - 7mm bottom center screw
Use your Phillips head #2 to remove the two - 8mm screws by the handle
Push down the two release points to pull the plastic piece up
Pull the plastic piece up

The outside six - 10mm screws and the inside set of four - 10mm screws are the same here, use your Phillips head #2 to remove them

Use your Phillips head #0 to remove the one - 7mm bottom center screw

Use your Phillips head #2 to remove the two - 8mm screws by the handle

Push down the two release points to pull the plastic piece up

Pull the plastic piece up

Step 10

              Display

Pull the silver tab, and clear tinted display off
Remove the 4 - 9mm screws holding the display with your Phillips head #0

Pull the silver tab, and clear tinted display off

Remove the 4 - 9mm screws holding the display with your Phillips head #0

Step 11

Remove the display
Remove the plastic protectant film from the motherboard

Remove the display

Remove the plastic protectant film from the motherboard

Step 12

              Removing the Motherboard

Remove the five - 8mm screws with your Phillips head #1, holding the mother board in place to the Roomba
Pull the mother board up off the Roomba
Be careful not to pull hard because there are a lot of wires attached to the motherboard

Remove the five - 8mm screws with your Phillips head #1, holding the mother board in place to the Roomba

Pull the mother board up off the Roomba

Be careful not to pull hard because there are a lot of wires attached to the motherboard

Step 13

              Unclipping the Wires

Remove the three sets of wires plugged into the back of the motherboard
Some of these can be difficult to remove, and you may need the help of the metal spudger

Remove the three sets of wires plugged into the back of the motherboard

Some of these can be difficult to remove, and you may need the help of the metal spudger

Step 14

              Unclip the Cliff Sensor Wires

Flip the motherboard over
Remove the five wire connections using the same method as the previous two
Lastly, remove the bumper sensor wires from the motherboard

Flip the motherboard over

Remove the five wire connections using the same method as the previous two

Lastly, remove the bumper sensor wires from the motherboard

To reassemble your device, follow these instructions in reverse order.

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                                                                                      6 other people completed this guide.

Author

                                      with 2 other contributors

                    Matt Davis

Member since: 01/22/2015

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Team

                       Cal Poly, Team 21-20, Maness Winter 2015                        

                                                  Member of Cal Poly, Team 21-20, Maness Winter 2015 



                    CPSU-MANESS-W15S21G20                     


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                                            14 Guides authored

james000222 - Oct 1, 2016

Regarding the reassembly process - there is a lack of clarity regarding reassembly and placement of the front bumper assembly. THe internal components are barely touched upon in the sequence above, and one picture shows the intenal sensor bar completely unattached. It is not.

Eric - Jan 30, 2017

anyone know how to bench test this? One of my capacitors blew up.. Well two did and I cannot seem to get it working after replacing them.

Luiz Ribeiro - Oct 2, 2019

HI Matt, I have an Roomba 650 that stop working and I’ve realized there is an resistor burned on the main board (R138) and it’s impossible to check its value. Do you know have to check it or have the schematic available? Many Thanks

CoKo A - Jun 12, 2020

Hi Luiz, I am trying to locate and test R138 but can’t find it on the board. Would you be able to give me a clue to find out where I should be looking? Thanks

dogtrainered - Nov 10, 2020

While pulling the wire connectors out, a wire came loose. How do you reattach the wire to the connector? Is it pressure fitted or soldered?

Introduction#

What you need#

Team#

Introduction

What you need

Team