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Class D Switching Power Amplifiers and Power D/A conversion

TDA7498E don't produce any sound (red Amplifier module)
TDA7498E don't produce any sound (red Amplifier module)
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Old 18th May 2020, 02:26 PM   #31
manojtm is offline manojtm  India
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Quote:
If i'm not wrong reading the circuito, this capacitor you say is on the position C16 of the circuito, right?
I test it with my DMM and this is not damage.
PIN-29 check the volt with DMM it should be 1.8v~2v if not replace capacitor with new

Regards
MANOJ
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Old 18th May 2020, 02:34 PM   #32
Jorgesilva is offline Jorgesilva  Portugal
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Quote:
Originally Posted by manojtm View Post
PIN-29 check the volt with DMM it should be 1.8v~2v if not replace capacitor with new

Regards
MANOJ
Do i need power up the TDA7498E with 12v or 24v for test because i need remove the heatsink, you say this in other post, right?
For measure the PIN29 i need the DMM and connect the black terminal on GND in of the power supply of TDA7498E board and the red terminal on PIN29, right?
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Old 18th May 2020, 02:36 PM   #33
manojtm is offline manojtm  India
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yes and PIN 21,22 also

Regards
MANOJ
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Old 22nd May 2020, 01:51 AM   #34
Jorgesilva is offline Jorgesilva  Portugal
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Originally Posted by manojtm View Post
yes and PIN 21,22 also

Regards
MANOJ
Hi my dear NANOJ, i hope you have an nice day.
Yesterday i power up my TDA7498E without testing the PINs you say for i test but the amplifier board work for about 5min. and know it don't give any sound.
I don't understand why this happen but the IC is not damage.
I suspect the amplifier shutdown because the standby or mute.
Can you give me a help without testing the PINs first?
The pins it's to small and i hope don't short anything when i test the pins.
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Old 22nd May 2020, 07:10 PM   #35
Jorgesilva is offline Jorgesilva  Portugal
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Quote:
Originally Posted by manojtm View Post
yes and PIN 21,22 also

Regards
MANOJ
Hi my dear NANOJ, i hope you have an nice day.
Today i test the pins you say to me, and i supply the module board TDA7498E with 12v.
I test the pins from the GND of the power terminal of the amplifier and this is my values from the pins (DMM measure DC Voltage):

PIN 20: 0.00
PIN 21: 0.00
PIN 22: 0.05
PIN 29: 0.00

The VCC PIN os reading 11.7v.
I hope my pins is right, but you can see on the picture if my schematic is righ!
If you can give me some help.

Best regards
Attached Images
File Type: jpg IMG_20200522_195400_739.jpg (801.9 KB, 35 views)

Last edited by Jorgesilva; 22nd May 2020 at 07:19 PM.
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Old 23rd May 2020, 01:56 PM   #36
manojtm is offline manojtm  India
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Hi,

you counted wrong direction i think

you can see a dot mark (punch) on IC

Regards
MANOJ
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File Type: jpg TDA7498.jpg (29.7 KB, 34 views)
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Old 23rd May 2020, 02:35 PM   #37
Jorgesilva is offline Jorgesilva  Portugal
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Quote:
Originally Posted by manojtm View Post
Hi,

you counted wrong direction i think

you can see a dot mark (punch) on IC

Regards
MANOJ
Thank you for correcting me my dear NANOJ.
I'm using DMM correct? I put the black terminal of DMM on GND terminal of power supply of TDA7498E and red terminal i use to measure the voltage on PINs, is this the right way to measure the PINs?
Sorry to asking you all this stuff, but i don't have to much knowledge on that.
I was trying to count the PINs using the datasheet schematic for the TDA7498E.
I will test the PINs (20, 21, 22 and 29) again and re-enter their values.
Meanwhile, can you Share the values of this PINs for i can compare with the values of my PINs?
Thanks a lot for the help.

Best regards.
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File Type: png Screenshot_2020-05-15-14-08-38.png (247.0 KB, 33 views)

Last edited by Jorgesilva; 23rd May 2020 at 02:47 PM.
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Old 23rd May 2020, 07:17 PM   #38
Jorgesilva is offline Jorgesilva  Portugal
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Quote:
Originally Posted by manojtm View Post
Hi,

you counted wrong direction i think

you can see a dot mark (punch) on IC

Regards
MANOJ
Hi again my dear NANOJ, i hope you have an nice day.
This time i measure the PINs of my TDA7498E the right way, use your picture as reference and this is the values from the PINs of the IC:

PIN 20 = 0.96v
PIN 21 = 3.15v
PIN 22 = 0.13v and the voltage drop to 0.08v
PIN 29 = 0.00v

I supply the module board TDA7498E with 12v for measure the PINs of the IC.
I don't know what is the problem for this amplifier board TDA7498E don't work.
Can you give me some help?
Big thanks.

Best regards.
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Old 24th May 2020, 02:23 PM   #39
manojtm is offline manojtm  India
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Quote:
I supply the module board TDA7498E with 12v for measure the PINs of the IC.
PIN 20 = 0.96v
PIN 21 = 3.15v
PIN 22 = 0.13v and the voltage drop to 0.08v
PIN 29 = 0.00v

Hi,

PIN 20(STBY) & 21(MUTE) should be minimum 2.5v{pin 21=3.15v is ok} and pin 20=0.96v may be it is taken to High(because 0.5v= low) but PIN 29=0v is low it should be 1.8v.I already said replace 10uF capacitor with new

Regards
MANOJ
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Old 25th May 2020, 08:00 PM   #40
Jorgesilva is offline Jorgesilva  Portugal
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Quote:
Originally Posted by manojtm View Post
PIN 20 = 0.96v
PIN 21 = 3.15v
PIN 22 = 0.13v and the voltage drop to 0.08v
PIN 29 = 0.00v

Hi,

PIN 20(STBY) & 21(MUTE) should be minimum 2.5v{pin 21=3.15v is ok} and pin 20=0.96v may be it is taken to High(because 0.5v= low) but PIN 29=0v is low it should be 1.8v.I already said replace 10uF capacitor with new

Regards
MANOJ

Hi my dear NANOJ, i hope you have an nice day.
Can you give me a help?
Is that capacitor i mark on picture i need to replace?
Other question, i measure the outputs speakers from the amplifier and it's reading DC voltage on the outputs. This is the values from the outputs speakers from the amplifier:

Left channel: 1.18v
Right channel: 0.68v

I know this values (DC voltage) from the amplifier in outputs speakers can damage my speakers, right?
I hope you can give me a help.
Many many thanks for your time.

Best regards.
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File Type: jpg IMG_20200525_205020_922.jpg (179.1 KB, 19 views)
 

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