HELP - Bose PS28/48 -


New member
Username: Fjrules

Post Number: 2
Registered: Apr-09
Hi All,
I have been reading abbout the Bose PS12 DIY repair and now I have a problem of my own with a LS28 subwoofer!
It is named PS28/48.
I have prevoiosly resoldered the crystal (only yellow LED light) and it has worked perfectly for 4 years. Now there is no sound at all. I have checked to see if the crystal were loose, checked all cables etc and all seems to be OK. My big questions now is: Can it be the cystal that is defect and is overclocking? We have measured the circuit board and found that it seems like the board is "restarting" constantly. Only once we were able to retrieve a green LED flash which only occured three or four times!
Every thing seems be in order, the powersupply is working, the cables are OK, no resistors burned etc. SO please if anyone can help???


New member
Username: Martin74

Post Number: 2
Registered: May-11
hi i have a bose ps28 that if loud the volume is distortion ,i changed
u102 and u103 and is the same ,the voltaje at the rail is from 13 v to
24 v variable.
thanks for yuor help
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