Logitech S Lg3 Subwoofer Logitech Soundman Speaker Capacitance Replacement Repair Guide

Difficulty

Moderate

Steps

Time Required

                          30 minutes

Sections

Capacitance
6 steps

Flags

In Progress

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BackRéparation Logitech S-LG3 Subwoofer Logitech Soundman Speaker
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Introduction

What you need

Step 1

              Open up the casing

Before all unplug the power supply from the wall socket to make sure the appliance is shut down.
Remove the 8 screws from the rear panel with a #01 philips screw driver
Keep the screw drivers aside and smoothly separate the two halves of the casing.

Before all unplug the power supply from the wall socket to make sure the appliance is shut down.

Remove the 8 screws from the rear panel with a #01 philips screw driver

Keep the screw drivers aside and smoothly separate the two halves of the casing.

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Step 2

              Detach the main board from the rear panel

Inspect the inside of the casing and check the visual aspect of the capacitors. Wear glasses and gloves in case of leaking electrolyte from capacitors.
Gently unsnap the connection pins on the right of the picture.
Smoothly unsnap the connector of the power supply attached to the main board. Don’t try to pull these connectors : you may damage the power chord and get more repairs to do.

Inspect the inside of the casing and check the visual aspect of the capacitors. Wear glasses and gloves in case of leaking electrolyte from capacitors.

Gently unsnap the connection pins on the right of the picture.

Smoothly unsnap the connector of the power supply attached to the main board. Don’t try to pull these connectors : you may damage the power chord and get more repairs to do.

Step 3

              Separate the main board from the casing

Remove the 5 screws binding the main board to the casing. Use a #01 Philips screw driver.
Remove the 2 screws that binds the heat sink to the metal plate of the casing. Use a #01 Philips screw driver.
The 2 screws of the heat sink might be sealed with glue. Use a cutter to scracth and completely remove the glue.

Remove the 5 screws binding the main board to the casing. Use a #01 Philips screw driver.

Remove the 2 screws that binds the heat sink to the metal plate of the casing. Use a #01 Philips screw driver.

The 2 screws of the heat sink might be sealed with glue. Use a cutter to scracth and completely remove the glue.

Step 4

              Release the main board

Make sure you have removed the heat sink of subwoofer drivers and the 7 screws.
Unsnap at least one connector that links the main board to the woofers.
Spot the capacitor that you will need to change. Spot the shape of the top of the capacitor : if in curved shape it means the capacitor must be changed asap. Sometimes there is no visible damage of the capacitor but the replacement of the capacitor will still fix the sizzling sound.

Make sure you have removed the heat sink of subwoofer drivers and the 7 screws.

Unsnap at least one connector that links the main board to the woofers.

Spot the capacitor that you will need to change. Spot the shape of the top of the capacitor : if in curved shape it means the capacitor must be changed asap. Sometimes there is no visible damage of the capacitor but the replacement of the capacitor will still fix the sizzling sound.

Step 5

              Replace the capacitor

Make sure you have spotted the minus sign printed on the side of the capacitor to avoid any error in the placement of the spare capacitor. If the pins of the new capacitor are not soldered in the right pin holes it will result in severe damages.
Use a soldering iron to remove the dysfunctional capacitor. Use desoldering braid and clean the PCB if you see electrolytic leakage.
With the soldering iron solder the spare capacitor to the main board with the negative terminal in the same hole as the previous capacitor.
With a cutting plier cut the terminals of the capacitor as close as possible to the main board. This will avoid any risk of circuit shortening and new damage to the subwoofer.

Make sure you have spotted the minus sign printed on the side of the capacitor to avoid any error in the placement of the spare capacitor. If the pins of the new capacitor are not soldered in the right pin holes it will result in severe damages.

Use a soldering iron to remove the dysfunctional capacitor. Use desoldering braid and clean the PCB if you see electrolytic leakage.

With the soldering iron solder the spare capacitor to the main board with the negative terminal in the same hole as the previous capacitor.

With a cutting plier cut the terminals of the capacitor as close as possible to the main board. This will avoid any risk of circuit shortening and new damage to the subwoofer.

Step 6

              Apply thermal paste before final step

Don’t forget this step to avoid any thermal damage that may lead to destruction of components or injuries.
Apply some thermal grease to any surface that interface with the heat sink.

Don’t forget this step to avoid any thermal damage that may lead to destruction of components or injuries.

Apply some thermal grease to any surface that interface with the heat sink.

Please follow the previous steps in the reverse order to finish this fixing and enjoy listening to clean sound again.

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Author

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                    David

Member since: 05/23/2014

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dark circ - Mar 15, 2022

The only difficult part is putting the thing back together.

In Progress#

Member-Contributed Guide#

Introduction#

What you need#

In Progress

Member-Contributed Guide

Introduction

What you need