Hello, this morning my washing machine decided to give up so ive had a go at trying to fix it.
Took awhile but I think I've found the fault in the power supply to the main PCB.
Thought the fault was in the transformer as that's where I think heat had started, no major damage just some blackening around it and other components.
Removed the transformer expecting to see further damage in coil but seemed ok, starting to think the transformer heated up due to increase in voltage.
Have included pic of power supply, mains voltage at 240v goes across the green power resistor, not sure what yellow component is, then there's two 4007 diodes in series with each other. Measured the voltage at mid point of diodes an I got 108v DC, seems ok as it's half the sine wave. The voltage then increases to 338v DC across the second diode, this was present at transformer.
Could it be the high DC voltage that's to blame for heat at transformer, or have I missed something?
Don't fully understand how the power supply works hoping someone could explain what's going on. Seems strange having a DC voltage going to a transformer.
And how has the DC voltage risen from 108v at centre of diodes to 338v at end of second diode?
As always appreciate any replies.
Took awhile but I think I've found the fault in the power supply to the main PCB.
Thought the fault was in the transformer as that's where I think heat had started, no major damage just some blackening around it and other components.
Removed the transformer expecting to see further damage in coil but seemed ok, starting to think the transformer heated up due to increase in voltage.
Have included pic of power supply, mains voltage at 240v goes across the green power resistor, not sure what yellow component is, then there's two 4007 diodes in series with each other. Measured the voltage at mid point of diodes an I got 108v DC, seems ok as it's half the sine wave. The voltage then increases to 338v DC across the second diode, this was present at transformer.
Could it be the high DC voltage that's to blame for heat at transformer, or have I missed something?
Don't fully understand how the power supply works hoping someone could explain what's going on. Seems strange having a DC voltage going to a transformer.
And how has the DC voltage risen from 108v at centre of diodes to 338v at end of second diode?
As always appreciate any replies.