I am in the process of repairing an audio amplifier that employs a TDA7295 as
the woofer driver.
The repair of the original fault, which was causing the TDA7295 and a TDA7265
to be held
permenently muted, went fine, but having got the mute control level working
again, I find that I
have no output from the TDA7295. It seems to be shot - for reasons that are
however unclear to me
- but I would appreciate a second (or more) opinion. The levels around the
chip are as follows:
Supplies: +/- 28V,
Vin+: input signal of +/- 0.7V,
Vin-: just a dc level of -9.6V,
Vout: just a dc level of -24.8V,
Bootstrap input: just a dc level of -25.6V.
These levels remain the same regardless of the state of the MUTE input.
STANDBY is always inactive, i.e. +3.5V. Any suggestions on how this state
could have arisen?

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