Michael Karas schrieb:
[This followup was posted to sci.electronics.repair and a copy was sent
to the cited author.]
In article , says...
Is there a "bleed-through" route for start-up?
I do not really know what you are asking about here. ...
This
http://www.bilder-hochladen.net/files/big/12b4-a6-6c52.jpg
is a typical schematic for a SMPS. The supply voltage for the
controlling IC is provided via R1 for the first moment - I think this
is N_Cook's "bleed-through" route. When the circuit is working the
supply voltage is generated by W3/D1/C6.
If R1 is open and/or C6 has a short the SMPS won't start.
HTH
Reinhard