Hello..
Right now i have 3 dead psu, try to fix it, but because i'm a totally noob, i have problems.
++++++++++
1). FSP AX450-PN with 5vsb problem.
At the beginning while i connect this psu to the motherboard, it refuse to boot.
but after waiting 1 minutes, it's start flawlessly.
Then i realize the 5vsb is low.
It start with 4.2v, then slowly raise. until reach 4.5-4.6v, and the motherboard, fan etc is spinning flawlessly.
But still raise until reach 5.1v and then stop.
for the first time, i think this is maybe because of capacitor fail.
so i recaps all small capacitor near optocoupler, replace the optocoupler, even replace the small coil.
but there's still the same, low voltage at the beginning.
then i replace 5v dm311 ic..checking the diode and even replace 5vsb transformer, (i take the components from the other unit that flawlessly normal)
And, still the same..
Low 5vsb, and i have to wait one minute to reach my motherboard minimum voltage (4.5v) to boot.
Any ideas?
++++++++++
2). Amacrox AX550-80Plus - Missing component.
The second is amacrox ax550 (fsp oem).
Primary caps is bulging heavily.
and after check, i note missing component from the psu.
one of smd zener diode with green-red-orange marking ring is missing.
after googling, i still have no idea about that zener specs..
any ideas?
and can i replace it with "normal" diode?
++++++++++
3) Enlight 500watt APFC with dead PFC IC.
the third psu is old enlight psu, model pps-500-204d, delta design with apfc.
dead psu, then i found one of zener diode in pfc modul shorted.
i pulled it, and found marking code 1 20 like the illustration below.
Without the zener, suddenly that enlight can running, except rather low in all rails (12v => 11.1v, 5v => 4.2v etc)
at my first taught, this is maybe 20v zener diode..
so i replace it with 20v 500mw zener diode..
but it can't working with the replacement..
then i found the other zener from my box with marking 2-15.
the stupid of me, i put that zener in pfc module, and switch the power supply on, and pufff..spark from the ucc3818n pfc ic.
I tried to replace it with CM6800 but not working.
So i wonder, what is the specs of zener diode with 1-20 marking code?
and, about cross reference of ucc3818 pfc ic...can i replace it with other ic..?
++++++++++
Thank you very much..sorry for my english, (this is not my mother language afterall, i'm from indonesia)
and sorry for (very) long question..
Right now i have 3 dead psu, try to fix it, but because i'm a totally noob, i have problems.
++++++++++
1). FSP AX450-PN with 5vsb problem.
At the beginning while i connect this psu to the motherboard, it refuse to boot.
but after waiting 1 minutes, it's start flawlessly.
Then i realize the 5vsb is low.
It start with 4.2v, then slowly raise. until reach 4.5-4.6v, and the motherboard, fan etc is spinning flawlessly.
But still raise until reach 5.1v and then stop.
for the first time, i think this is maybe because of capacitor fail.
so i recaps all small capacitor near optocoupler, replace the optocoupler, even replace the small coil.
but there's still the same, low voltage at the beginning.
then i replace 5v dm311 ic..checking the diode and even replace 5vsb transformer, (i take the components from the other unit that flawlessly normal)
And, still the same..
Low 5vsb, and i have to wait one minute to reach my motherboard minimum voltage (4.5v) to boot.
Any ideas?
++++++++++
2). Amacrox AX550-80Plus - Missing component.
The second is amacrox ax550 (fsp oem).
Primary caps is bulging heavily.
and after check, i note missing component from the psu.
one of smd zener diode with green-red-orange marking ring is missing.
after googling, i still have no idea about that zener specs..
any ideas?
and can i replace it with "normal" diode?
++++++++++
3) Enlight 500watt APFC with dead PFC IC.
the third psu is old enlight psu, model pps-500-204d, delta design with apfc.
dead psu, then i found one of zener diode in pfc modul shorted.
i pulled it, and found marking code 1 20 like the illustration below.
Without the zener, suddenly that enlight can running, except rather low in all rails (12v => 11.1v, 5v => 4.2v etc)
at my first taught, this is maybe 20v zener diode..
so i replace it with 20v 500mw zener diode..
but it can't working with the replacement..
then i found the other zener from my box with marking 2-15.
the stupid of me, i put that zener in pfc module, and switch the power supply on, and pufff..spark from the ucc3818n pfc ic.
I tried to replace it with CM6800 but not working.
So i wonder, what is the specs of zener diode with 1-20 marking code?
and, about cross reference of ucc3818 pfc ic...can i replace it with other ic..?
++++++++++
Thank you very much..sorry for my english, (this is not my mother language afterall, i'm from indonesia)
and sorry for (very) long question..
Half of the computer problems is caused by bad contacts 
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