Hi
I'm trying to fix my sonos playbar which I bough as faulty because It wouldn't turn on. This is a second unit with exactly the same no power problem due to short in bridge rectifier. I've replaced faulty part + the fuse and psu is working but with some issues. Output voltage without any load fluctuating between +15-16V but under a load it drops to +8-9V (default output should be around +15V)
Pwm IC is FAN6300. I've also noticed that voltage on pin 6 VDD also fluctuating between 9 and 14V. So far I've replaced 3 x 1000uF in the output stage, pwm chip, 2 x 100uF/400V and 100uF cap directly connected to pin 6. There is no short in the output side. I've checked all smd resistors and they seem to be ok.
I haven't checked all smd caps around pwm IC. Has anyone seen this problem before or have any ideas?
Thanks
I'm trying to fix my sonos playbar which I bough as faulty because It wouldn't turn on. This is a second unit with exactly the same no power problem due to short in bridge rectifier. I've replaced faulty part + the fuse and psu is working but with some issues. Output voltage without any load fluctuating between +15-16V but under a load it drops to +8-9V (default output should be around +15V)
Pwm IC is FAN6300. I've also noticed that voltage on pin 6 VDD also fluctuating between 9 and 14V. So far I've replaced 3 x 1000uF in the output stage, pwm chip, 2 x 100uF/400V and 100uF cap directly connected to pin 6. There is no short in the output side. I've checked all smd resistors and they seem to be ok.
I haven't checked all smd caps around pwm IC. Has anyone seen this problem before or have any ideas?
Thanks
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