ATD2 Studio Monitor Amplifier help based on TDA8920BTH and 8922

[Dirtynut]

Hi everyone, I’m new to to forums and would like to thank in advance everyone who is willing to help.

I have a pair of studio monitors (speakers) And one of them started to sound as if the speaker was blown, I took the amps out of the speaker that sounded blown and upon further inspection i noticed that a capacitor had blown off as you can see in the picture. I have no idea what value this capacitor is supposed to be(based on PDFs for the 8920bth seems like 100nf), The amps is a three channel design but is only being used for the lows. I know there are some very smart people on these forums and I was hoping someone could help. I’ll list what I’ve tried and what I’ve observed below:

Tried amp from working speaker on speaker that sounded blow and everything sounds fine.
Took capacitor circled in yellow and replaced blown capacitor circled in red (didn’t work)
Tried different value capacitors and now the display on the back of the monitors says amplifier error (might have damaged good capacitor as well).

Thanks in advance to anyone willing to help.

[mariush]

The pad under that capacitor circled in red may be f'ed up...  be prepared to use a bit of wire if needed to solder to trace.

The circuits should be more or less identical but that chip may be in btl mode instead of 2 separate channels

Check all the resistors, one may be blown without visible signs. Replace that chip, it's probably gone as well.

[Dirtynut]

You’re absolutely right the pad is f’ed up so I’ve attached wires so I can test different caps without constantly soldering and unsoldering. As far as the chips one chip is a TDA8920BTH and the other is a TDA8922BTH but it seems as if the 8922 was bypass or not used from the factory as there is two other separate amps for the mids and highs. The funny thing is even with the blown capacitor it was working fine except the low end sounded like the coils was fried and only at higher volumes, but since I’ve taken the capacitor off of the 8922 and used it on the 8920 side now the rear display just says amplifier error. The voltage coming into the unit is 27v +/- and the voltage across where the cap is supposed to be is 54v according to my meter.

Some more pics. Thanks for the reply

[vdamdavid007]

Hey there,

a bit off topic here, but does someone have the "SCS software" for controlling the monitors?
i have a couple of AV2.D but lost the installation files.
https://manualzilla.com/doc/5975190/scs-user-manual
this is the manual

Thanks in Advance!