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Yes, the loudspeaker did pop before I replaced the capacitors. So far, the power supply is working again but I've noticed that the DC voltage output from the bridge rectifier is very imblanced. The + output side is measured across the 220uF 250V capacitor at 120Vdc and - output side is also...

The voltage measurements are done with the relay open as it does not remain closed when I switch on the speakers. Stand-by power supply on the primary side over the 33uF/400V capacitor is at 320V. My mains are 230V. I have got some progress. I replaced the various electrolytic capacitors with...

I tested the rectifier in diode mode in this order: M (Multimeter) & R (Rectifier) 1) M+ to R- & M- to R~ = 0.551V drop 2) Reverse = OL 3) M- to R+ & M+ to R~ = 0.562V drop 4) Reverse = OL 5) M+ to R- & M- to R+ = 0.966V drop Below are the voltage measurements over the 2 220uF 250V capacitors...

Great repair review! I have a pair of KEF LSX which has a power issue on the secondary speaker. Whenever I plug in the secondary speaker, the relay keeps ticking. My guess that it is trying to turn on but due to a fault somewhere on the PSU board, it switches off. I measured some voltages and...