Disassembling Macintosh Iisi Logic Board Repair Guide

Difficulty

Difficult

Steps

Time Required

                          15 - 35 minutes

Sections

Top Case
2 steps
Hard Drive
2 steps
Floppy Drive
2 steps
System Fan
2 steps
Power Supply
2 steps
Logic Board
2 steps

Flags

BackMacintosh IIsi
Full Screen
Options
History
Save to Favorites
Download PDF
Edit
Translate
Get Shareable Link
Embed This Guide
Notify Me of Changes
Stop Notifications

Introduction

What you need

Step 1

              Top Case

Start by turning the computer around, and remove this #0 Phillips Screw.
There may or may not be a Phillips #0 screw here, depending on whether or not the computer has ever been serviced.

Start by turning the computer around, and remove this #0 Phillips Screw.

There may or may not be a Phillips #0 screw here, depending on whether or not the computer has ever been serviced.

1024

Step 2

Now lift these two clips, and slowly pivot the case up.
You can now seperate the top of the computer from the rest of the machine.

Now lift these two clips, and slowly pivot the case up.

You can now seperate the top of the computer from the rest of the machine.

Step 3

              Hard Drive

The Macintosh IIsi’s hard drive is located ajacent to the ram and floppy drive.
Start by pushing these two tabs out, and lifting the drive up.
Then, flip the drive over, and remove the connection cables.

The Macintosh IIsi’s hard drive is located ajacent to the ram and floppy drive.

Start by pushing these two tabs out, and lifting the drive up.

Then, flip the drive over, and remove the connection cables.

Step 4

The hard drive: A Quantum ProDrive LPS, made in 1990, and surprisingly, it still works!
This drive has an 80MB capacity, not very large by today’s standards, but not bad way back then…
Believe it or not, hard drive construction hasn’t changed much in the last 20 years. Other than a few new interfaces, the form factor, 3.5" width and 4-Pin 12V/5V power connector has stayed the same.

The hard drive: A Quantum ProDrive LPS, made in 1990, and surprisingly, it still works!

This drive has an 80MB capacity, not very large by today’s standards, but not bad way back then…

Believe it or not, hard drive construction hasn’t changed much in the last 20 years. Other than a few new interfaces, the form factor, 3.5" width and 4-Pin 12V/5V power connector has stayed the same.

Step 5

              Floppy Drive

The “SuperDrive” is mounted similarly to the hard drive, and positioned right next to it.
Push these two tabs out, and lift the drive up.

The “SuperDrive” is mounted similarly to the hard drive, and positioned right next to it.

Push these two tabs out, and lift the drive up.

Step 6

Flip the drive so it is on top of the power supply, and remove the “Red-Ribbon” cable.
1.44MB floppy drives need a ribbon cable with a red stripe on one side. 400KB floppy drives use a ribbon cable with a yellow stripe on one side. 800KB floppy drives can use a red, or yellow striped cable.
This drive was manufactured by Sony in 1990.

Flip the drive so it is on top of the power supply, and remove the “Red-Ribbon” cable.

1.44MB floppy drives need a ribbon cable with a red stripe on one side. 400KB floppy drives use a ribbon cable with a yellow stripe on one side. 800KB floppy drives can use a red, or yellow striped cable.

This drive was manufactured by Sony in 1990.

Step 7

              System Fan

The fan recieves power from two contacts on the logic board and has no connector.

The fan recieves power from two contacts on the logic board and has no connector.

Step 8

In all of the years that I have worked on this machine, I have found no good way to remove the fan.
The best way to start, is to push in here on the side of the fan.
Being careful not to exert too much force, try to push in, and wiggle the fan outward as such. (2nd Photo)
You can now lift the fan all the way out, and remove it.
The Fan Power Contacts on the Logic Board:

In all of the years that I have worked on this machine, I have found no good way to remove the fan.

The best way to start, is to push in here on the side of the fan.

Being careful not to exert too much force, try to push in, and wiggle the fan outward as such. (2nd Photo)

You can now lift the fan all the way out, and remove it.

The Fan Power Contacts on the Logic Board:

Step 9

              Power Supply

To remove the power supply, squeeze these two tabs and lift the front up.
On the back of the power supply, there is a tab that also must be pressed to remove the power supply fully. You can then lift it out all the way. A firm tug may be necessary to seperate the power connector.

To remove the power supply, squeeze these two tabs and lift the front up.

On the back of the power supply, there is a tab that also must be pressed to remove the power supply fully. You can then lift it out all the way. A firm tug may be necessary to seperate the power connector.

Step 10

Information on the power supply:
It was made by Sony in 1990, and uses a 10-Pin power connector.

Information on the power supply:

It was made by Sony in 1990, and uses a 10-Pin power connector.

Step 11

              Logic Board

The logic board is designed in a way, where it can be slid forward, then lifted out.
To remove the board, push these two tabs outward, and begin to slide the logic board away from the back (Port Side) of the computer.
Once the logic board clears the ports it can be lifted out.

The logic board is designed in a way, where it can be slid forward, then lifted out.

To remove the board, push these two tabs outward, and begin to slide the logic board away from the back (Port Side) of the computer.

Once the logic board clears the ports it can be lifted out.

Step 12

The Processor: 20Mhz Motorola 68030 model # MC68030RC20B
The Onboard RAM: 1MB Soldered the the logic board.
RAM Slots: 4 30-Pin DIMMs installed in pairs.
ROM SIMM Slot: If your computer doesn’t have one if these (and it works) , it doesn’t need one. If it has one, it needs it in order to boot.
PDS Slot: For Attaching a riser card containing a math co-processor. A PDS card can then be plugged into the riser card. PDS - Processor Direct Slot
Power Supply Connector: for direct connection to the power supply.
“VSLI” chip: This machine’s equivalent of a “Northbridge” It manages RAM, PDS, and the external ports.

The Processor: 20Mhz Motorola 68030 model # MC68030RC20B

The Onboard RAM: 1MB Soldered the the logic board.

RAM Slots: 4 30-Pin DIMMs installed in pairs.

ROM SIMM Slot: If your computer doesn’t have one if these (and it works) , it doesn’t need one. If it has one, it needs it in order to boot.

PDS Slot: For Attaching a riser card containing a math co-processor. A PDS card can then be plugged into the riser card. PDS - Processor Direct Slot

Power Supply Connector: for direct connection to the power supply.

“VSLI” chip: This machine’s equivalent of a “Northbridge” It manages RAM, PDS, and the external ports.

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

Cancel: I did not complete this guide.

                                                                                      One other person completed this guide.

Author

                                      with 2 other contributors

                    Chris Green

Member since: 10/11/2009

35,367 Reputation

                                      48 Guides authored                  



                       Badges:
                       46







                                                        +43 more badges

Team

                       Master Techs                        

                                                  Member of Master Techs 



                    Community                     


                                            310 Members                     


                                            1,168 Guides authored

Telstra Support - Oct 23, 2018

Its logic words is the one of the various types of content and if you are using telstra internet and you are having types of issue with your telstra then you can visit our this site and get the solution as you want so for more information about the telstra you can follow this link Telstra Internet Support.

Ano Niem - Aug 8, 2020

What are you guys even talking about? I know from Aussie friends that Telstra is terrible, apparently you guys also have a crap spamming algorithm.

Jack Richer - Dec 20, 2018

Our convenient Mac smaller than expected rationale board expulsion apparatus in fact fits in the rationale board’s screw gaps, however it doesn’t feel right. We will require more use. Might it be able to be that some great antiquated thumb squeezing works? It does! A firm push on either side of the blower exhaust is everything necessary, and the entire board unclips and slides out. As much as we cherish making incredible apparatuses, nothing makes us more joyful than seeing something you can benefit without any devices by any stretch of the imagination Apple service centre gold coast

Ano Niem - Aug 8, 2020

Why is the difficulty rating set to that? It’s dead easy to take it apart, a child could do it!

Introduction#

What you need#

Team#

Introduction

What you need

Team