SONOS Sub (Gen. 1) Repair (Replacement Power Supply)

Last time I teared down that dead SONOS Sub, now we repair it …
↓↓↓ Complete description, time index and links below ↓↓↓

WARNING: This video involves AC mains, which can cause serious injury or death! Do not try to recreate anything shown in this video unless you are qualified.

In a previous video I teared down a dead SONOS Sub (Gen. 1) and did a failure analysis (link below). My conclusion was that the power supply was gone for good, but the digital part is still working and that the amplifier is probably OK too.

So I proposed to replace the power supply with an off-the-shelf one. And that’s what we’ll be doing in this video. The original power supply and the audio amplifier are on one board, so that’s a challenge. And there’s not much space available.

00:00 Intro – short recap and the repair plan
02:09 Replacement PSU selection – power, space, safety
08:43 Depopulating PCB – majority of original PSU parts
13:45 Planning – mounting and wiring of new PSU
19:53 Mounting – a bracket with 4 holes and 2 standoffs
25:52 Wiring – AC mains, DC and class II EMI connection
29:08 Test and adjustment – turning up the voltage to
31:59 Board installment – it’s a tight space
35:12 Reassembly – of the speaker
37:44 Function test – the digital part works
39:22 Wrap-up – a repair with some restrictions, bye

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#sonos #sonossub #subwoofer #repair #fix #robertssmorgasbord