noisy sound vs1053shield_v2

[brumla23]

Hello, I need some advice. After plugging in and loading the software, the sound on the SPKR (L+, L-, R+, R-) is very noisy. It is stronger on (R+, R-). It behaves the same on all boards. I suspect GBUF, specifically capacitor C21 (if connected C21 to direct after startup, the board resets, but after the sound is subsequently noiseless). Where could the fault be? thanks

[e2002]

Hey @brumla23 !

1. Possible short circuit between pins 44 and 45 or 44 and 43 of VS1053 chip.
2. Capacitor C23 from the "bad" batch and "noisy". Try replacing it.
3. Possibly poor quality power supply.

[b-point]

Thank you for the quick reply to brumla23.
I checked according to recommendation 1 (sound from jack is clear).
Replaced capacitor C23 with another according to point 2.
Tried different sources 3.
Unfortunately, there is a noise when you turn it on (plug to power). But if I keep the ESP32 powered and press the RST button on it. A reboot is performed and then the sound is perfect. I have no idea what to do with it :-(

[e2002]

@b-point , please send a photo of the VS chip (larger if possible)

[b-point]

[e2002]

@b-point

1. It is necessary to clean the board from flux residues.
2. Please check that there is no contact on jumper JP1
3. Using a multimeter, check the pins of the VS chip for compliance with the circuit (the absence of short circuits between adjacent pins where they should not be)
4. Using a multimeter, check the pins of the components around the PAM for consistency with the circuit (no shorts where they should not be)
5. Check the operation of the board in the minimum configuration:

#define LED_BUILTIN          2
#define I2S_DOUT             255
#define VS1053_CS            27
#define MUTE_PIN             13
#define MUTE_VAL             LOW

[b-point]

I added a button between EN and GND. After turning it on for the first time, I press it, it resets and then the sound is no longer noisy. My knowledge is not at such a level to look for a noise problem after connecting to the power supply. If you don't have any idea, please close the thread. Very nice project. Thanks for the effort.