I BET it is the RAM I'd replace BOTH with DDR2 200 pin DIMs
2GB each... $15 on eBay That Clicking business sounds like a bad HDD! The Click Of Death You want an INDEPENDENT Mac repair shop. Apple Stores are only for items less than 3 to 4 years old! J.C. On Fri, Mar 30, 2018 at 4:17 PM, Jim Scott <[email protected]> wrote: > Hi John, > > I gave up on “shadetree” BGA reflows years ago, but YMMV. My reflows > worked for a while, then died for good. > Another issue with the 2008-era iMacs is that occasionally the “coolant” > (ether, I’m told) leaks out of the tubes running to and from the fins and > the heat sink proper. Same problem with G4 iMacs, which also are pretty > efficient little stationary Hoovers and can choke themselves to overheat > death. > > Jim Scott, Eureka, CA > > > On Mar 30, 2018, at 2:00 PM, 'John Carmonne' via iMac Group < > [email protected]> wrote: > > > > > > On Mar 30, 2018, at 10:53 AM, Jim Scott wrote: > > > >> > >> In the case of your 2008 iMac, in addition to all of the above, the > cooling fins of the heat sink can be clogged by dust, etc. over time as the > air intake vents directly below the card and heat sink assembly are > hoovering up stuff from the desktop. This leads to overheating and eventual > failure of the BGA. Reflowing the BGA doesn’t work because by the time the > problem shows itself, too many of the microscopic traces inside the chip > have been damaged by arcing. That’s why a more permanent repair involves > replacing the chip with a new one. But new chips are hard if not impossible > to find, and my favorite eBay bad chip repair/replace guy refuses to work > on those old iMac video cards because he can’t guarantee a reflow and he > can’t obtain new chips that will work with the card. > >> > >> Been there, done that a number of times. It’s time to ewaste that iMac, > in my experience. > >> > >> Jim Scott, Eureka, CA > >> > > > > I have recently fixed a number of these iMacs may sound crazy but it > worked for me. It's free and at this point you have nothing to lose. > > > > Take the card off the heat sink and clean all the paste off. > > Pre heat oven to 390 F (pre heat is important) > > Place card on 4 small aluminum foil balls at the corners > > Bake for 7 mins > > Open door and let board cool don't touch it or move it. > > When cool reinstall (don't forget to apply new paste). > > > > I have also found some with faulty fans so check the fan working before > you put it all back together. > > > > > > > > John Carmonne > > Yorba Linda CA > > 92886 USA > > MacPro 2.66 Quad Nehalem > > > > -- > You received this message because you are a member of the iMac Group, a > group for those using Apple iMacs and eMacs. > The list FAQ is at http://lowendmac.com/imac/list.shtml and our > netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml > To post to this group, send email to [email protected] > To leave this group, send email to [email protected] > For more options, visit this group at http://groups.google.com/ > group/imaclist > > --- > You received this message because you are subscribed to the Google Groups > "iMac Group" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are a member of the iMac Group, a group for those using Apple iMacs and eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/imaclist --- You received this message because you are subscribed to the Google Groups "iMac Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
