Shurti does not work filter board, but it emits sounds by the audio in. and not emit by audio out

shurti does not work filter board, but it emits sounds by the audio in. and not emit by audio out.

shurti does not work filter board, the control board apparently is OK.

it does not emit sound by audio out, but it emits sounds by the audio IN, but without VCA or filter.
control board is OK, if I modify parameters of the filter or VCA, I do not have changes in sounds.

i want to know
somebody happens something like that?
somebody can know where this the error?

thanks. greetings. and pardon by my English.

If you check some other recent posts about faulty (SMR-4) filter boards, you’ll see labelled pictures provided, which show you how to trace the OSC signal through the board.

Providing pictures of the top & bottom of the board can also help others here see problems.

The majority of problems I would say are generally bad solder joints. IE, dry joints, and shorts…