Re: Bose L1 Compact Speaker, TOP258 IC blowing

Thanks
So I'm thinking of changing all the resistors and the caps on the HV side. Since the resistors also looks a bit tarnished even though it measures ok. Also I'm ordering in some diodes.
Anyways I'm having some doubts about the capacitor. C42 is a 47pF 1kV Ceramic disc cap and the dielectric material stated on the service manual was X7R. I couldn't find the same from mouser.
I found the same rating capacitors but different dielectric material. So my question is matching the dielectric material that important?...

Re: Bose L1 Compact Speaker, TOP258 IC blowing


All the resistors shows the correct values.
I tried measuring the value of C42 but my meter does not read in the pico range. I'm not sure if there's any other way of checking that. Visually it looks ok no cracks or burned marks.

Update on the test for the TVS diode:
My test setup was isolation transformer -- variac -- rectifier --test circuit.
Important note - there were no smoothing capacitors connected across the rectifier output so the DC was not smoothed.
I had two 20k resistors...

Hey Folks my first post here,
I've recently got a Bose L1 compact sound system in for repair. The unit failed to power up one day.
After opening the unit up the first thing I noticed was the TOP258 IC was cracked open. Before replacing the IC I had a look for any other components which might have failed. I checked for the obvious culprits and I couldn't find anything which has failed. I checked the diodes and resistors around the IC, checked the main filter caps and the electrolytics near the IC. Checked the secondary side for any shorts or failed caps and nothing. I checked the...

Re: New Members - please post your introductions here

Hello from the Maldives. My name is Yamin. Keen to learn