APC Back-UPS Pro 1000 S Teardown

Written By: TheLastMillennial (and one other contributor)

Published: August 24, 2025

Written By: TheLastMillennial (and one other contributor)

Published: August 24, 2025

Teardown

Introduction

⚠⚡ This device contains high voltage capacitors. Wear high voltage PPE when the main circuit board is exposed.

ℹ This device uses three different lengths of Phillips head screws.

ℹ The devices shown in this guide already has the power cable removed. This does not change any steps.

This teardown is not a repair guide. To repair your APC Back-UPS Pro, use our service manual.

Pull on the battery pull tabs with the cables still attached. (In the picture the cables are already disconnected)
There should be enough slack in the cables to set the battery back down at an angle. This will let you access both cables.
Unplug both cables. Preferably unplug red first.

Remove the 5 phillips head screws in the battery compartment.
The black component (circled in green) is a temperature sensor. It can be left alone.

Turn the UPS so the screen faces you.
Stick a spudger in the cutout (outlined in red) to release the plastic snaps.
The snaps are firm so take your time and work your way across each edge.
Remove the 6 phillips head screws (circled in red).
Pull the face plate toward you to remove. It should take very little effort to remove.
The buttons are captive and will not fall out.

Remove the two phillips head screws (circled in red).
These are a different size than the previous screws!
Lift the low-voltage circuit board to remove it. Note: It pivots at the bottom.
You may remove the connectors on the circuit board. Refer to this guide for removing connectors: Recognizing & Disconnecting Cable Connectors

Turn the UPS with the back facing you.
Remove the 6 phillips head screws.
Pull the backplate towards you to remove. It is connected to many wires and could take some effort to get loose. You cannot fully remove it.
Do not touch any exposed metal since it is connected to the high-voltage circuit board.
The back plate just needs to be about a centimeter away from the rest of the shell.

Turn the UPS with the battery compartment facing you.
Insert a plastic spudger into the bottom middle hole (outlined in red) to separate the plastic snap.
There are no high-voltage components in this area.
Pull up on the plastic shell to release it.
There are small plastic snaps at the top of the UPS but pulling hard enough should release them without breaking.
Once the shell is free, remove the cables from the battery compartment. The red wire may take some wiggling but it will fit through the hole.

⚡ Wear high-voltage PPE for any further disassembly.
The transformer (outlined in red) can seriously electrocute you. Do not misuse it.
Be careful with the 400v capacitors. (circled in orange)
The metal towers (circled in blue) are heat sinks for mosfets. The mosfet part number is: IRFB7440 IOR P806J JK GO. These can explode under use and trigger an F02 error on the unit.
The relays (circled in yellow) can break which will also cause an F02 error on the unit.
The bottom of the circuit board cannot be accessed yet. The picture fit better here than the next step though.

Unplug all wires from the circuit board. Some are very difficult to remove.
You cannot remove the thick black and red wire without desoldering.
Unscrew the 2 Torx T25 screws (circled in blue) on the metal posts to remove the wires.
Unscrew the 4 phillips head screws (circled in red).
Release the plastic snaps (outlined in yellow). You may need to pull up on the board to keep the snaps released. The board will pivot at the top.