Logitech S-LG3 Subwoofer Logitech Soundman Speaker Capacitance Replacement

Geschrieben von: David
  • Kommentare: 1
Logitech S-LG3 Subwoofer Logitech Soundman Speaker Capacitance Replacement

Schwierigkeitsgrad

Moderate

Schritte

6

Zeitaufwand

30 Minuten

Einleitung

The purpose of this repair is to fix crackling or sizzling subwoofer that may give unpleasant sounds. Most of the times the sizzling sound appears gradually along with the use of these speakers. It is mostly caused by a over-stressed capacitor : generally the circuitry of the cut-off is badly designed and the capacitor is shortened. Sometimes the damage to the capacitor can be observed as the top of the capacitor has a curved shape. Sometimes it is not visible. I replaced that capacitor with a higher-grade component : here a capacitor dedicated to the automotive industry.

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    • 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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    • 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.

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    • 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.

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    • 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.

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    • 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.

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    • 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.

Abschluss

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

Tinte & Feder

David

Mitglied seit: 23/05/14

1415 Reputation

Ein Kommentar

The only difficult part is putting the thing back together.

dark circ -