Welcome to AstaHost - Dear Guest , Please Register here to get Your own website. - Ask a Question / Express Opinion / Reply w/o Sign-Up!
Power Supply Rebuilding
Posted 15 April 2005 - 12:45 AM
Anyway, after that's all said and done, and the power supply's been replaced, what you're left with is a dead PS. My question is, how would one rebuild it so it's functional again? I've had several power supplies die in my times, and I'm sick of basically throwing them out. Are there any diagrams online somewhere that people could point me at telling me how to rebuild them?
Posted 15 April 2005 - 02:36 AM
The problem usually with a bad PSU is the magic smoke left. Its a fact of life, things get hot, banged, all whatever and hell, but when you see the magic smoke leave (usually bluish or white) they are definitly shot. cause the magic smoke is put into the circuts and makes them go.
now, all joking aside, the problem usually is bad capacitors. so my idea, would be to run a current through it, something small. if you had the diagram, you could check at certian points, slowly narrowing down the search. in the end, youd probably isolate a capacitor or 2, which are shot. so youll need to find the exact specs on them (wts, resistance,. charge held, capatiance rate. dunno, read the book on electronics, promtly forgot it 10 seconds later like any sane person should), go to radioshack, find the exact one, break the old one off, solder the new one in.
me, personally id pay the 50$.
Posted 15 April 2005 - 08:21 AM
If you don't get an actual burn-out, it can be hard to spot the problem without testing equipment. Look closely at the tops of the capacitors (the ones with a silvery looking top) to see if they have bubbled up to look rounded on top instead of flat. That's usually a sign that the cap has blown.
Usually it comes down to one part frying, so a full rebuild isn't necessarily what is needed. If multiple parts are fried, that is the result of something really nasty like a near-direct lightening strike or a fan dying which stops the PS from cooling and can melt several parts rather quickly. Sure, shelling out $50 for a new PS is great if you can do that, but it isn't always possible for some and others just like the challenge of a repair.
Oh, and sometimes it will be something as stupid as the power switch breaking on the inside. Happened to me once and thought it was the power supply.
I have been learning much about power supplies lately. You can read about one of my fun adventures here: http://www.astahost....97&st=0&p=19220
Posted 15 April 2005 - 09:43 AM
Posted 21 April 2005 - 11:58 PM
Posted 26 October 2007 - 03:58 PM
I have a 19 volt 3.42 amp (model no.SADP-65KB B)laptop power supply. Last night when I switch it on its not working...I open the casing n find that a SMD transistor and to resistance is burned.I cant see the transistor name n no. coz it burned the part name on PCB is Q2 for transistor n R20 n R23 for resistances. Can anyone know about this schematics n help me about finding these parts. I can replace the components if I find the part name. Thnx
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users