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04-04-2002, 12:19 PM
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#1
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Low Bitrate
Join Date: Mar 2002
Posts: 80
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LM2587 chip getting too hot
I need help. I have just completed my second Sproggy power supply (the first was a bit messy) but the LED doesn't work. Also, the LM2587 chip gets extremely hot. Is this normal.
I have yet to check whether the volts are coming out the other side.
Please see this thread here |
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04-04-2002, 12:53 PM
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#2
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Registered User
Join Date: Aug 2001
Location: Missing In Action
Vehicle: Mini (British Open Classic)
Posts: 779
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Check the voltage across the LED to see if there is one first, then check to see if it is the correct way round.
Also is there a heat sink on the chip, if not fit one.
Also check for short circuits and the usual stuff.
Rob
__________________
And you say people actually pay money for M$ Windows?
www.mp3mini.co.uk (Does what it says on the URL) www.openclassic.co.uk (The new car, with zero rust!) www.rob-web.co.uk (My other site)
Total re-design underway: on the whole progress is very slow as the car is taking up too much time :)
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04-04-2002, 01:11 PM
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#3
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Registered User
Join Date: Apr 2001
Location: Chicago Suburbs
Vehicle: 2000 Cavalier Z24
Posts: 1,282
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i read the other post and it said you are having trouble with heat sinks... if you need to mount them i suggest getting a heat sink kit they are very helpful. you should only need one kit, if im reading the description right.
can you measure the voltages that are being outputted on the output pads.
hmmm, a little more info please
~mike
__________________
Single Member of the "1000 Post and No MP3 Car" Club
PROJECT ON INDEFINATE HOLD... BOUGHT A HOUSE
2000 Cavalier Z24 [###-------] Only 30% Done ... Still
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04-04-2002, 01:54 PM
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#4
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Low Bitrate
Join Date: Mar 2002
Posts: 80
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Update... not good...
I swapped over the 587 chips with another that I had and now the solder starts to melt between the MUR120 and SA28A.
Sorry if this is vague but I have little knowledge of electronics and thought this would be a good way to learn.
PS. How do I check the output voltages. I have a multimeter and can check the input but I don't know where to put the multimeter pins on the circuit.
Last edited by mkkbb; 04-04-2002 at 02:51 PM.
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04-04-2002, 02:50 PM
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#5
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Low Bitrate
Join Date: Oct 1999
Location: N Ireland
Posts: 108
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Sounds like you have put the SA28A diode back to front and it is short circuiting. Double check the diode directions. Best practice would be to replace both diodes with new ones, as if they got hot enough to melt the solder they are probably damaged.
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04-04-2002, 02:54 PM
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#6
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Registered User
Join Date: Apr 2001
Location: Chicago Suburbs
Vehicle: 2000 Cavalier Z24
Posts: 1,282
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on the solder side of the board, use the pencil probes that you have for your multimeter (i hope), touch the black one to the "gnd" pad (metal) and then use the red one and touch that to one of the other pads (+12, -12, +5, -5, +3.3, power good). however, if you are melting solder between two of the diodes that is not good.
advice: hold off on turning that thing on again. it sounds like you have some stuff installed wrong. double and triple check the polarites of everything on the circuit. make sure no solder has short circuited across 2 or more pads.
someone will help. trust me.
~mike
__________________
Single Member of the "1000 Post and No MP3 Car" Club
PROJECT ON INDEFINATE HOLD... BOUGHT A HOUSE
2000 Cavalier Z24 [###-------] Only 30% Done ... Still
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04-04-2002, 03:43 PM
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#7
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Registered User
Join Date: Aug 2001
Location: India
Posts: 1,636
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post pictures of the PSU top and bottom. and close up everything
mastero
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04-05-2002, 07:29 AM
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#8
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Low Bitrate
Join Date: Mar 2002
Posts: 80
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Woo hoo
Thanks to everyone who helped, Sproggy got it spot on, I had wired the SA28A diode on the wrong way. I think trying to do it late in the night caused the problems. I noticed it this morning and everything works fine. I have a heatsink on it too, and am getting all the right output voltages.
Cheers guys, you're the best.
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04-05-2002, 11:30 AM
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#9
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Registered User
Join Date: Jan 2002
Location: Oakland, CA
Vehicle: 1997 Honda Civic Del Sol Si
Posts: 649
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Leave it to the man himself to know what's "buzzing" on sombody's sproggy 
Any tips for me as I start to solder the parts? |
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04-05-2002, 12:50 PM
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#10
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FLAC
Join Date: Jan 2002
Location: Mellansel, Sweden
Vehicle: Audi 90 -88, VW Polo CAB -81
Posts: 1,299
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Quote:
Originally posted by CrazyLittle
Leave it to the man himself to know what's "buzzing" on sombody's sproggy
Any tips for me as I start to solder the parts?
follow the pix on sproggys page, it was really easy for me with them, and dont turn anything in the wrong direction  |
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