abut testing smps for short circuit

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#1 21662033 02 May 2012 09:07

noel gervais gerard Louis noel gervais gerard...

Anonymous

Post #1
21662033 02 May 2012 09:07

hi can i test smps with a 100 watt buld for short circiut if the fuse was blown
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#2 21662034 04 May 2012 07:39

DAVID CUTHBERT DAVID CUTHBERT

Anonymous

Post #2
21662034 04 May 2012 07:39

I will assume the switcher is an off-line switcher operating on 240 VAC. The most likely failure is the switching transistor (probably a MOSFET). Using a DMM you can check the MOSFET source-to-drain for a short.
#3 21662035 10 May 2012 07:06

Melt Brink Melt Brink

Anonymous

Post #3
21662035 10 May 2012 07:06

yes you can use a bulb, But it would be far simpler to use a multimeter. Start at the input plug 220VAC measure for low resistance between N,L and E. Work you way through the EM filter toward the bridge rectifer 450V electrolytic cap and driver FET. I have found plenty shorts on the rectifier, HOT, EM filter caps and thermistors. Also check the MOV's
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