Db Technologies Cromo 12 amplifier no audio

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

woofer and tweeter

[budm]

Re: Db Technologies Cromo 12 amplifier no audio

So right now either one of them are working?
That shorted out filter cap should not affect the operation of the unit once it is removed.

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

tomorrow I will try to solder the capacitors to understand what happens, I keep you updated, I preferred to do the tests you asked me to avoid burning the power amp as I ordered it from china and I had to wait 2 weeks before receiving it, let me know also how should I behave with the inductors if you think they are okay or I have to replace them

[budm]

Re: Db Technologies Cromo 12 amplifier no audio

At this point those inductor for the outputs will not stop the unit from working.

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

ok I'll update you tomorrow

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

I mounted the capacitors but still no sound output from the woofer or the tweeter

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

how can i proceed now?

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

I also noticed that the final of the tweeter (the innermost one) warms up much more than that of the woofer (the outer one)

[budm]

Re: Db Technologies Cromo 12 amplifier no audio

Since you are not getting the sound form Tweeter or the Woofer, then it is probably something that is common to both amplifiers, such as that both of them are in Mute mode, or the audio signal form input is not getting all the way to the amplifiers.
This is not going to be easy fix. Do you have working board to do Voltage comparison testing?
Do you have audio signal tracer or scope to trace out the audio path from input all the way to the output sections?

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

unfortunately I don't have an oscilloscope but I have the same amplifier so I could do some tests if you tell me what to do

[budm]

Re: Db Technologies Cromo 12 amplifier no audio

https://cdn.badcaps-static.com/pdfs/...6bfeac6d82.pdf

Look at page 22 then check the Voltage at the Mode pin 23 of the working unit and the not-working unit.

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

in the TDA8950TH the pin mode controll is number 6 but I didn't understand what I need to test, if you could explain me in practice thanks

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

what voltage should i have?

[budm]

Re: Db Technologies Cromo 12 amplifier no audio

Sorry, my typo, it is pin #6.
Just put Black probe on ground, red probe on pin 6 of the working unit and non-working unit and see if they are about the same Voltage.
Page 6 and 7 of the spec sheet shows you what the Voltage of each mode should be.

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

ok tomorrow I'll do this test, now it's night here, the unit is equipped with an analog / digital converter, could that have some problem? or the operational amplifiers? however we take it one step at a time

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

I checked the voltages of pin N ° 6 and both on the non-working amplifier and on the working one I have a voltage of 49.5 +/- volts

[budm]

Re: Db Technologies Cromo 12 amplifier no audio

I checked the voltages of pin N ° 6 and both on the non-working amplifier and on the working one I have a voltage of 49.5 +/- volts

Are you sue you are using the correct circuit ground? Are you sure you are on the right pin?
I also do not understand 49.5 +/- Volts? +49.5V? -49.5V?
Pin 6 Mode pin works on 5V level.

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

for +/- I meant more or less because the value ranged from 49.3 to 49.5 il pinera undoubtedly the number 6

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

I used ground circled in red

[falcontech]

Re: Db Technologies Cromo 12 amplifier no audio

tomorrow I will do the test again, I would not like that I have set the tester wrong