hi all, i am trying to repair a late-2007 3,1 macbook 2.2GHz which had suffered a liquid spill and would greatly appreciate some help. i have some previous hit-and-miss experience of such repairs, usually by bathing the logic boards in 99% isopropyl alcohol and brushing them i have revived some, but others remain dead.
however, this particular one has made me think i could have more strategy to approaching the repair...
when i received this board, it wouldn't boot at all, and the magsafe charger light did not switch on. after one clean, it seemed to work great, so i re-assembled the machine with ram in both slots and used the computer for a couple of hours. after a couple of days i went to switch the machine on again but this time it would not boot. the harddrive spins up and the front white led illuminates, the cpu heatsink fan spins up, however it does not chime and the lcd does not display anything or even briefly flash like i have seen some do.
i thought perhaps it was a ram issue, so i have tested it with different ram, and with just either one of the ram slots occupied, but this has not made any difference. i also tested it without any ram in at all, expecting to get the front white led flashing and the "beeping" sound, but the behaviour remained the same as with ram installed, so i guess the problem actually lies somewhere prior to the ram being checked.
so i want to clean the logic board again, it all appears to be clean and i cannot visibly see any residue or oxidation even under magnification, therefore i expect there must still be some hidden beneath a component somewhere.
based on the problem i have described, is anyone able to help me locate physically where abouts on the board i should be focussing my efforts? i feel quite confident in working with these old 2006-2009 polycarb macbook boards, but my electrical knowledge isn't sufficient to figure out what components on the board are responsible for doing what (bar the obvious i.e. cpu, gpu and northbridge).
thankyou in advance!