Hello Everyone! I have focal alpha 80 speaker that outputs no sound, yet it detects input audio and exits standby mode.
It has two amplifiers (one for each speaker) one TDA7296 and one TDA7294: on pins 15 and 13 i get 37v on one amp and 75v on the other, on pins 8 and 7 e get the same voltages on the corresondent amp. I probe the input (pin 1 and 3/2) with an asciloscope and got nothing, same on the outputs (pin 1 and 14).
So the amplifier chips are geting power but no signal, i looked before and there are some more amplifier chips 074C (searched for GZNS534 and found nothing) these chips are all getting aound 10v VCC but the outputs some have 1v some have close to 0. Probing with the osciloscope gave no concrete result.
I presume the main amplifiers are ok but the signal is not gething there somehow lost betwin the standby detection and the amp chip.
Bellow a provide a picture of the board. I have not been able to find a shcemtic and going in blind is more dificult
How should i proceed? I'm a bit new in audio equipment repair so i appreciate every help!