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 R309 and R310, and R310 is connected directly to the PWM controller (FAN6751MR) and that pulses half a second later (or earlier)
I have replaced the FAN6751MR, replaced the df08s bridge rectifier and replaced a 400v 100uF CAP, but it keeps pulsing.
When i inject 24 volts on a CAP (35v 2200uF) right after the power supply the Sonos boots up and works without any problem.
Can someone give me a hint where i should poke my multimeter?
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 R309 and R310, and R310 is connected directly to the PWM controller (FAN6751MR) and that pulses half a second later (or earlier)
I have replaced the FAN6751MR, replaced the df08s bridge rectifier and replaced a 400v 100uF CAP, but it keeps pulsing.
When i inject 24 volts on a CAP (35v 2200uF) right after the power supply the Sonos boots up and works without any problem.
Can someone give me a hint where i should poke my multimeter?
