Hello, Zdomici!
your investigation was very useful . In my case R441 also came to "opened cirquit" state and I had to replace it.
But my case is a bit more complicated. I had two power supplies: one with "amber LED" sympthom (#1), and the other one
with completely destroyed PFC section, broken fuse e t.c (#2). After replacing the power FETs of PFC I've got 390VDC
at capacitors but PS still failed to run. I supposed the problem was in mesonine sub-board with PFC and PWM
chips and replaced it with good one from the "amber LEDed donor" (#1). The problem remained. Later I've found that
one of the sync rectifier FETs was dead, replaced it, and PS became alive. So I made a conclusion that the mesonine board from #2
was OK and soldered it to #1.
When I saw your post I thought that now I'll repair #2, replaced R441 but all remained the same :(
Probably mesonine was not OK.
I'm writing this long story for 3 reasons
1. you asked to report other cases with this PS. Now you know about rectifier FETs :)
2. do you know what is the "NDF" reason in the chinese chart that you kindly provided?
3. do'nt you think it is rather strange that there are som many problems with simple resistors in low current circuits?
Maybe you have some ideas concerning it? I have only one: both problematic resistors are located close to the header that
connects t-sensor to the board. It is connected with "thick" wire. The intensive airflow may cause some vibration of that wire
which is passed to the header -> board and destroys the resistors.