HEC-250LR-T ATX Computer psu

[joshnz]

Re: HEC-250LR-T ATX Computer psu

Sorry, where I said "gate to source" should have been "drain to source"

Or in other words, the two right-most legs on the package when viewed from the front.

ok merry xmas

is interesting that R011 is open on your supply as well.

[joshnz]

Re: HEC-250LR-T ATX Computer psu

agent the missing resistor from your psu is 388k by multimeter
orange white yellow gold 390k ohm on my psu.

[Agent24]

Re: HEC-250LR-T ATX Computer psu

agent the missing resistor from your psu is 388k by multimeter
orange white yellow gold 390k ohm on my psu.

Thanks, now I just have to figure out why mine is nothing more than a pair of leads...

[joshnz]

Re: HEC-250LR-T ATX Computer psu

Thanks, now I just have to figure out why mine is nothing more than a pair of leads...

Your psu has a different controller I think they might not need it. I wonder why r011 is open must be a short on your 5vsb.

[joshnz]

Re: HEC-250LR-T ATX Computer psu

Well I got my 5vsb controller today and it is not happy.
I have a 100watt bulb in series (where the the resister blew)
And it is ticking as if there is a short there is no short.
control has 5volts that is near under voltage cutout.

[Agent24]

Re: HEC-250LR-T ATX Computer psu

Try with a new resistor, and put the lightbulb on the AC input in series with entire PSU on the active line?

A repetitive noise in an SMPS is not always a short
(http://www.repairfaq.org/sam/smpsfaq.htm#smpsstsm)

[joshnz]

Re: HEC-250LR-T ATX Computer psu

Try with a new resistor, and put the lightbulb on the AC input in series with entire PSU on the active line?

A repetitive noise in an SMPS is not always a short
(http://www.repairfaq.org/sam/smpsfaq.htm#smpsstsm)

as i stated in last part of post it is in under voltage mode.

may be the case as the filament in the bulb is inductive

[joshnz]

Re: HEC-250LR-T ATX Computer psu

Still not happy.
I removed fuse and attached 100 watt bulb and put in .44 ohm resistor with no change

[Escort Eagle]

Re: HEC-250LR-T ATX Computer psu

Why are you removing fuse ? Use Series bulb outside of the circuit, put series bulb in your main AC line, Not inside from your circuit board . Now tell us - Is series bulb still glowing after 3 seconds ?

[joshnz]

Re: HEC-250LR-T ATX Computer psu

Why are you removing fuse ? Use Series bulb outside of the circuit, put series bulb in your main AC line, Not inside from your circuit board .

Because it is much less hassle then chopping up a cord just to intercept the phase. And is electrically the same.

Now tell us - Is series bulb still glowing after 3 seconds ?

Not glowing the controller is going into under voltage protection.
Because control is on the under voltage threshold.

[Escort Eagle]

Re: HEC-250LR-T ATX Computer psu

That means you have no 5VSB at output . This is why Control (C) is remaining on the under voltage . It could be happen due to two reasons - One for secondary side problem and other for Primary side .

First - check those parts in the secondary side which are regulating 5VSB . How 5VSB is regulating ? Is it regulating by TL431 or zener ? If so, then check that TL431 or zener and other surroundings resistors and capacitors . And don't forget to check the Opto-coupler also .

[joshnz]

Re: HEC-250LR-T ATX Computer psu

Found the problem aux winding had a break.
Running normally now.

[Agent24]

Re: HEC-250LR-T ATX Computer psu

Your psu has a different controller I think they might not need it. I wonder why r011 is open must be a short on your 5vsb.

That seems odd, since the model and revision are exactly the same. Then again, it wouldn't be the first time a manufacturer changed a design without modifying the sticker...