Hi!
It is my first post in this forum and I hope I'm in the right section.
My Name is Chris, 26 from Germany and studying electronic engineering.
My 3 years old tryer stopped working. Nothing happens anymore. I checked the power electronics and saw a burned resistor. This resistor connects the secondary VCC to earth (not to ground). Between the resistor and the connectionpad for the earth cable is a track loop. I can't read the value of this resisto and don't know why it is connected to earth. Maybe someone knows it?
I attached a picture of this PCB part.
The transformer is burned at the secondary site too. The transformer is marked with:
1200940100
CEC 1033
But I can't find anything with this codes.
But I guess it will be possible to identify the trnsformer by checking the circuit.
The SMPS is built with a Power Integrations TinySwitch (TNY254).
After the TNY254 is a one wave rectifier and a 16V cap to filter the voltage. This voltage is VCC of the secondary side now.
I know that it must be between 1,8V and 5,5V because it is also VCC for a microcontroller (Nec PD78F9177).
I hope you can help me to find a new transformer and repair my dryer!
Thanks!
Regards
Chris