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Class D Switching Power Amplifiers and Power D/A conversion

No sound from TDA7492P Amp
No sound from TDA7492P Amp
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Old 31st January 2018, 09:03 PM   #21
FauxFrench is online now FauxFrench  France
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OK, can be disturbance from the Bluetooth.

NO Bluetooth connected, CHEAP speakers at the outputs: if you touch on C1 and C11 (diagram above) with a very small screw-driver (careful not to make any short-circuits) on the side toward to Bluetooth, can you hear hum in the CHEAP speakers? (This is my first test "is it alive?")
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Old 31st January 2018, 09:10 PM   #22
FauxFrench is online now FauxFrench  France
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Quote:
Originally Posted by dutchronnie View Post
I have 19 volt on ic1 between pins 2,3 and 8,9
But only with Bluetooth connected?
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Old 1st February 2018, 05:47 AM   #23
dutchronnie is offline dutchronnie
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Quote:
But only with Bluetooth connected?
Yes, but the music must also be playing.


Only bluetooth connection and no music playing, then there is no high voltage on the pins.
when i stream the music from my phone to the board, then the voltage goes high.
and only on the right channel.

I have the board examend very well, and don't see any shorts on the circuit board, or components that are wrong soldered.
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Old 1st February 2018, 06:29 AM   #24
chermann is online now chermann  Austria
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Quote:
Originally Posted by dutchronnie View Post
Yes, but the music must also be playing.


Only bluetooth connection and no music playing, then there is no high voltage on the pins.
when i stream the music from my phone to the board, then the voltage goes high.
and only on the right channel.

I have the board examend very well, and don't see any shorts on the circuit board, or components that are wrong soldered.

Hi dutchronnie

Did you made this mods in this thread?
How to prevent popping sound on power on on TDA7492P Amp?

Last edited by chermann; 1st February 2018 at 06:34 AM.
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Old 1st February 2018, 06:39 AM   #25
dutchronnie is offline dutchronnie
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Quote:
Did you made this mods in this thread?
How to prevent popping sound on power on on TDA7492P Amp?
No.
I did the modifications with an previous board. that board didn't have this problem.
So this modification isn't the cause of the problem with the high voltage on the Right channel.
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Old 1st February 2018, 07:21 AM   #26
chermann is online now chermann  Austria
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maybe i am wrong ....i found something in the datasheet (same pic as you posted)

.. if you look at the pic from the input e.g. INNB + INPB and then follow the lines to the J1...its wrong gnd and signal is mixed!...look at the circles....mybe something happend there???

chris
Attached Images
File Type: jpg INNB_INPB_schematic wrong..JPG (25.3 KB, 37 views)

Last edited by chermann; 1st February 2018 at 07:30 AM.
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Old 1st February 2018, 07:22 AM   #27
chermann is online now chermann  Austria
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Quote:
Originally Posted by dutchronnie View Post
No.
I did the modifications with an previous board. that board didn't have this problem.
So this modification isn't the cause of the problem with the high voltage on the Right channel.
ok...just to notice its not..
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Old 1st February 2018, 07:29 AM   #28
dutchronnie is offline dutchronnie
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Maybe, i take a look at it this when i am home again.

It's strange, both board have exactly the same number, they look the same so why should one board the INPB an INNB been switched ?
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Old 1st February 2018, 07:33 AM   #29
chermann is online now chermann  Austria
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Quote:
Originally Posted by dutchronnie View Post
Maybe, i take a look at it this when i am home again.

It's strange, both board have exactly the same number, they look the same so why should one board the INPB an INNB been switched ?
hm.. i am not the expert...yes it is strange.

i ´m just follow the datasheet (page 5) from output back to the "source"
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File Type: pdf TDa7492p_Datasheet.pdf (480.8 KB, 9 views)
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Old 1st February 2018, 05:13 PM   #30
dutchronnie is offline dutchronnie
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Nobody know's how it is possible that there is an high voltage on the output?

Is it a failure in the TDA7492 chip or is it a component that is not connected or makes a short.
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