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Sony DAV SR4W

Rizwan77

Feb 5, 2023
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I have Sony home theater, SR4W, it serve me very well till now. It loses signals to Subwoofer sometime. Woofer connection is good, but sometime it work and then down. Any clue
 

Martaine2005

May 12, 2015
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The external connections may be good, what about the internal connections?.
Subs typically have a lot of vibration. Can you test the sub on a different channel?.

Martin
 

Martaine2005

May 12, 2015
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Intermittent issues are invariably loose connections. Either thermal or cracked solder joints.
It could also be electrolytic capacitors in the subs power supply.

Martin
 

Rizwan77

Feb 5, 2023
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Sometimes it works and then suddenly gone, I only use this as Amp, not using DVD, optical connected to LED
 

Harald Kapp

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Re-solder the bad connections. Often the solder joints between the external connectors to the subwoofer and the internal pcb are bad (dry or cold solder joints). Often caused by mechanical stress. It suffices then to re-solder these connections.
 

Rizwan77

Feb 5, 2023
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So, I refer this to my local technician, may he can understand the issue
 

Martaine2005

May 12, 2015
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Yes, it’s an easy job. The difficult (time consuming) part is disassembling and reassembling the unit. Any good technician will have the know how and experience to do it.

Martin
 

Rizwan77

Feb 5, 2023
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This the board, there no lose connection, nor any clue some burning, any further suggestions
 

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Martaine2005

May 12, 2015
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You need to remove the PCBs and check the solder joints. Use a magnifying glass. Check ESR of electrolytic capacitors.

Martin
 
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