NOTE !: as the messages have got quite long on this post, there is a 'Load more....' at the bottom that isnt very clear, if you cannot see your post / my reply make sure to hit this button !
Update: Repair serviceAlthough I did not set up the blog post with a view to offering a repair service, there has been a lot of interest from people to get these repaired. I have successfully repaired many units, people seem to really like these and not want to throw them away.
So if you would like me to repair your Streamium MCi500H or WAC7500 please feel free to get in touch.
Update: 2018I have continued to have good success repairing these and from other models, I have done them for people all over Europe ! The same supply is used in the WAC7500, MCi8080, MCi800, Mci900. Had quite a few now with significant failures on the switching circuit, probably switching MOSFET failure which then takes out multiple components.
So please get in touch if you would like yours repaired.
I also have a listing on eBay as another way of getting in touch. Just search on 'streamium repair'
Sound problems:The amplifier boards in these systems are quite prone to issues too and I have repaired many of these also. If you have no sound, sound from one side, crackling from the speakers then I can repair this as well.
It was disassembled and the power supply fuse (PCB solder mount, 4A, circled in pcb pic) had blown.
The PSU was a kingwall ps131 300 e0, good old 12nc 3141 078 50341
Further fault finding showed the following components dead.
FET on heatsink
high power resistor
All circled in this pic
no sign of any bad capacitors.
All the discretes were tested on diode check. The PWM IC was identified faulty by measuring across its rails, it was dead short.
Components changed and all running well again.
I couldnt find much on this PSU and no way to buy a repalcement, so was good to fix the original.