Inductor L53 in TDK 699-0153 LC PSU?

[SuperSVGA]

Does anyone know the specs for the inductor at L53 in the TDK 699-0153 LC power supply?

It appears in mine L53 is shorted (along with L51 and L52) and I'm looking to replace it to see if it gets the power supply going again, but I can't find any markings on it.



I would test the one in my other broken LC power supply, but I don't know for sure that one is any good, and I also don't have an LCR meter.

 

[devius]

I'm probably a bit late, but these usually have very low resistance, so what makes you think yours are shorted?

 

[SuperSVGA]

I'm probably a bit late, but these usually have very low resistance, so what makes you think yours are shorted?

You're right, the resistance was too low for any of my meters to measure. I had to get a more expensive meter just to get a reading.

I tried using a cheap little LCR tester on it, but it failed to identify it as an inductor.

Using another LCR tester I was able to measure around 2.8-3.0uH, but I'm not sure how accurate that is with the readings I got off the others with known values.

Right now what I'm trying to do is find a replacement that fits in the same footprint, but I'm not quite sure what to look for.

 

[devius]

Not knowing much about the state of your PSU, so take this with a grain of salt, I doubt the problem is with the inductors. Can you explain what the symptoms are?

Also note that there are other more common faults to look for, like diodes, the mosfet driver (Q1), the TL431 (IC54), burnt resistors or cut traces. I recently fixed one of these PSUs and besides the usual leaking caps there was also a cut trace that was not visible with the naked eye. Only when I measured continuity of all traces was I able to find it.

 

[SuperSVGA]

Can you explain what the symptoms are?

Right now I have:
PSU 1: Clicking, no/low voltage even under load, no change after recap
PSU 2: No sign of life, no/low voltage even under load, no change after recap
PSU 3: Just received this one, after recap looks good but some voltages are a little low

PSUs 1 and 2 are currently in a million pieces, I'm probably going to try and put one back together sometime after I do some more testing.