KEF LSX Teardown and Repair

[stingalleman]

R433 seems to be fine, I assume you're talking about that one, right?

 

[AnalogSteph]

Now the question is, why do 50 V rated caps grenade on a 30 V rail? Microcracks from thermal / mechanical stress and silver migration?

At this rate you'd almost be better off bodging in some electrolytics (maybe 47µ/63V or something so that ESR remains decently low).

 

[stingalleman]

Finally got around to soldering the components. Not too proud of my soldering job, but this is my first time doing something like this on SMD level, so I guess it's alright. Fucked pads weren't helping

Speakers are 100% functioning again. This fixed the master LSX not wanting to do anything network related (Ethernet not linking, not broadcasting AP to setup speakers, etc). Also had to restore the firmware on the slave speaker via the app.

For future reference, these are the components I used:

C441: https://www.digikey.nl/en/products/detail/tdk-corporation/C3216X6S2A106K160AC/14642034
C442: https://www.digikey.nl/en/products/detail/murata-electronics/GRM31CZ72A475KE11L/16033916
C443: https://www.digikey.nl/en/products/detail/tdk-corporation/C1608X7R2A103M080AA/513831