Electronics > Repair

Help repairing Boston acoustic Msubwoofer(no sound output) (pics)

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r2digital:
Hi everyone, i’m hoping some one has the patience to point me in the right direction to repairing this fairly expensive boston acoustic msub

At first the off/on/auto switch was busted so i forced it into auto mode by bridging a connection on the main board and now the blue light comes on but i don't get any audio output. Does anyone one have any experience repairing this amplifier? I looked it over, checked some the of output transistors, some of the power resistors and cleaned that nasty conductive epoxy glue stuff off but not having much luck in the trouble shooting department. I did  however find a part of the PCB that was discolored from heat that may be an area of interest. It consists of two transistors which you can see in the short videos i attached along with some pictures to my google drive

https://drive.google.com/drive/folders/1fx9ICpo1UH4mJoX8_hJFEv-s0_tVUBKF

r2digital:
In this pic, does it look  like parts are broke off and are missing from the preamp board or were these intentionally left off?

C263
R238
C259
R282

r2digital:
After searching the web ALOT i finally found the MSUB schematic maybe now some one can help?



Grandchuck:
Usually, early on, one verifies the supply and rail voltage.  For example,  have you checked voltages on sheet 2 of 7.

r2digital:
Sorry, i thought i uploaded the pictures but yes i did

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