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Laptop SMPS

I'm pretty sure it's shot but thought I'd share. This is a 65 watt 19 volt job, pretty much standard equipment in the laptop world with a barrel connector.

Yesterday I was using my Asus M6B00N lappy and when the battery was low I plugged the adapter in. The charge indicator came on and I left the room. When I came back the charge light on the front of the lappy was out and the battery icon in the systray (XP) was back. I messed with the plug and got it to charge again but it quit soon after. It seemed as if the wire going into the plug was broken because I could manipulate it and the charge would come and go. Finally it would not charge at all. I looked at the supply box and the led "power" indicator was not lit. I picked the SMPS and it made a tick tick tick noise so I said to myself UT OH! I unplugged the AC and plugged it back in and the led came back on. Plugged it into the laptop and the led went dark and the SMPS went tick tick tick. Unplugged the AC, plugged it back in and the led lit. This time I unplugged it, watched the led take about 10 seconds to go out meaning to me it gets its power from the output of the supply. I plugged it back in the led lit again, plugged the connector back into the lappy and the led died again. I suppose since these things get so damn hot and it is 2 years old that it's goes some dried up caps inside. I may cut it apart and attempt a repair. Until then the supply for my HP laptop works just fine, same connector, same voltage but 90 watts instead of 65.

Reply to
Meat Plow
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UPDATE:

It was the plug that was shorted from tip to ring but open from the tip to the supply cord (odd). How this occurred is beyond me because it's never been abused. Also the SMPS must have shunt protection because it was not damaged by the short.

Reply to
Meat Plow

Ha! I was just about to suggest a short at the plug, as my daughter's laptop PSU suffered exactly the same thing with similar symptoms, a couple of years back. Impulsive as she is, she couldn't wait for me to fix it for her, so rushed out and bought a generic replacement ...

Arfa

Reply to
Arfa Daily

Meat Plow wrote in news: snipped-for-privacy@news.alt.net:

I have fixed several. The insulation tends to break down where the coaxial power cable get the most flexing and the center conduction shorts to the braid. The supply has a short circuit fold back that usually protects it. Chop out the bad section and it is fixed. Usually, it is very close to where the cord exits the box. Some cables are three layers, with a sense line.

Be sure you connect the right lines to the right places because the laptop may NOT have reverse polarity protection.

It is ALSO possible that the input connector or battery on the laptop is the problem, or the cable near the laptop's end of the power cable.

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bz    	73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

bz+ser@ch100-5.chem.lsu.edu   remove ch100-5 to avoid spam trap
Reply to
bz

It was the plug. Problem is finding one with a right angle and made out of heavy duty materials. The crap at Radio Shack is just that, crap.

Reply to
Meat Plow

Try Digi Key or Mouser, they have some pretty good stuff. You might see if Switchcraft makes an appropriate plug, their stuff is top notch.

Reply to
James Sweet

I found one in good shape off a heavy duty wall wart I no longer use. I'll just splice it on since the plug is sealed. However my HP laptop uses the same size plug so I may just order a couple spares once I figure out the size.. I also found a couple Dell power supplies in my junk bin that use a three prong connector but are 3.5 amps at 18.5 volts. They'll work well for a spare supply for both laptops.

Reply to
Meat Plow

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