At 15:30 -0500 02/15/2003, Vintage Macs wrote: >From: "Daniel Kendell" <[EMAIL PROTECTED]> >Date: Sat, 15 Feb 2003 18:29:15 +0000
>I went up to my IIci to test Personal Web Sharing on my G3 via LAN, i pushed >the power button, it chimed, wirred for a bit then switched off. It does >that repeatedly. Sometimes it dosn't even wirr. :-( > >Wuzzup with it? I have taken out all exp' cards checked other connections. >Still the problem persists. > >I'm not much of an expert but my theory is that it is a PSU problem. Because >when it does wirr, the smiley mac comes up, it says welcome to Mac OS starts >loading then...off. It could be the power supply or the motherboard. There is at least one commonly occurring problem with the power supply, but I don't remember the component involved (and I think the symptoms are that it doesn't start up at all, if the machine was plugged in too long before start up). Hopefully someone with a better memory will be along to chat about PS problems. The electrolytic capacitors (look like tiny silver storage tanks dotten on the board) on the IIci MB tend to leak with age. This wouldn't be too bad, except that they leak corrosive and that can eat through exposed traces or solder on the motherboard. It doesn't usually get through the coating on the motherboard, but if it pools in a via (a hole through the board) it can eat the solder and copper out of the hole and break the connection the hole provided. Or it can eat the solder that connects pins to pads or any exposed copper traces or pads. This may not be the problem if your motherboard is the cause, but it stands a decent chance. If you remove the board and hold it at an oblique angle to a light source and wiggle it around, you may spot a darkened area. The corrosive isn't all that visible, it tends to just create a darker area on the board. Several of the caps in question are part of the power start circuitry and are located in the rear right quadrant of the board so that's the area in which to concentrate your examination. Anyway, the solution is to clean up any residue with swabs and isopropyl alcohol (or other suitable solvent) replace the old caps and find any damaged areas on the board and bypass (with wire) or repair them. Now days it may make more sense to just pick up another IIci board for $5 plus $10 shipping. Back when mine had this problem a IIci board still brought close to $200 so it was well worth fixing myself. Also, if you have a board with metal SIMM clips I think it's worth fixing. The metal clips seem much more reliable that the SIMM sockets with plastic clips. >BTW, i am probably breaking some rule but anyone know where i can get >service manuals so i can solve some problems myself? Apple manuals (even service manuals) don't cover board level repair so they wouldn't do you any good anyway. Jeff Walther -- Vintage Macs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Vintage Macs list info: <http://lowendmac.com/lists/vintagemacs.shtml> The FAQ: <http://macfaq.org/> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
