Sonos Play 1 pulsing power supply

[Goldwing1973]

I'm rather new to repairing electronics, i do know the basics of most components but never actually repaired a PCB, but i want to change that.
So, i bought a faulty Sonos Play 1 speaker with the intention of finding the fault, and replace the damaged part.
Well, i did find the fault, i replaced parts that i thought caused the problem, but no-go.

The problem is a pulsing power supply, when i connect the mains to the board and hook up my thermal cam i see R306,307 and 308 getting warm, but i assume that's normal.
But, whats is not normal is the pulsing of resistor...

[Mark01]

Hi guys,

This is my first post! 🚀
I have no idea what I’m doing, but I’m learning by trial and error.

I’m currently working on a Dell Optiplex AIO 7490—one of a bunch of AIOs that mysteriously failed to POST just a few days after the warranty expired. The original issue was that the PC worked fine until it was rebooted, after which it got stuck on a black screen (no backlight), with fans spinning at normal speed and a solid white power LED. Forcing it off by holding the power button would just cause it to switch on automatically and get stuck again on...

[holiver]

Boa noite, pessoal e o seguinte - Eu trabalhava como (contratado) para uma empresa que me forneceu um laptop Dell - Conforme a descrição a baixo - Concluí o contrato há mais de 2 anos, mas eles nunca solicitaram ou me enviaram instruções sobre como devolver o laptop, então ele ficou sem uso desde então. Acho que o prazo de prescrição expirou e gostaria de redefinir este laptop para poder usá-lo como um dispositivo pessoal.

Infelizmente, o BIOS está bloqueado, então não consigo inicializar a partir do USB. Consigo fazer login no computador usando minhas antigas credenciais...

[2elw]

Hey, I find it very absurd that the SVOD4 costs so much and has zero documentation. I had no other choice than to buy it to unlock ECs, if there was any documentation or firmware avalible I could've made it or something simmilar. Anyways here are some of the most important parts:

STM32H723VGT6 MCU - It's a microcontroller by STMicroelectronics and its the whole brain of the SVOD4. It has flash memory for the firmware which can be updated by the SVOD4 program. Its also powered by the AMS117 which converts 5v into 3.3V. 7€ on AliExpress.

GW1N-UV9UG169C6/I5 FPGA - Its a...

[Jro72]

I am in need of the bios bin file for this unit as the bios is bad. Tried using the update but it failed and have came to the conclusion after all test, only way is replacing the bios bin file. Any help would be greatly appreciated. Thank You

[teccyber-lab]

Hi guys, I hope you can help me. I need to edit this BIOS and disable the RAM memory on the motherboard. It displays video randomly, both on the main screen and in the HDMI port. I ruled out that it was the cable or the screen. I did a RAM test and it shows the video. Thank you very much in advance....

[questore]

Hi everyone.
If anyone has a BIOS and an EC dump that would be very nice.
Thank you

[questore]

Hi everyone,
I need a schematic and boardview for this modell please