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[SOLVED]820-3023 does not start quarter fan spin.

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got this MacBook air in, wouldn't not start.
I plug in the charger and it gives me a nice long dong.
turned of and picked up next day because of time .

day after... only quarter fan spin.no liquid damage anywhere the board is clean "as babys bottom" no shrek shit anywhere.

after measuring and searching, I stumble on the no PM_SLP_S4_L
omg crying time,
then after a while I see the c7030 and c7031 POLY-TANT.
I think fuck it, heat the bitch. and again nice long dong.
cooled down, no long dong, heated, long dong. etc.

but is there a way to test the poly-tant. in a "professional way" instead of heating the fucker......
 
D

dukefawks

Administrator
Never seen these go bad on an Air, so probably heating something else. Check voltages on both sides of R1800/1/2/3
 
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yup, couldn't find anything on it.
thanks for the swift reply

............pin 1 .pin 2
R1800 3.333 3.226 323.6k
R1801 3.334 3.046 1.003m
R1802 3.333 3.327 19.96k
R1803 3.333 3.328 19.82k
 
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ppbus_g3h 8.39v (measured both sides of R6920 8,39v and at c7200) " this is the one where one the schematic it says 12,8v but it has 8,4volt right ?"

PP3V3_S5 3.3334v
 
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btw after looking true the microscoop sideways, I found 1 probe point that was thick probe point 460
PM_THRMTRIP_L_R
after scratching it bit it seems its not making contact
could that cause the system to boot sometimes?
 
D

dukefawks

Administrator
Not sure but looks like if that trace was broken it would not affect anything as it needs to be pulled low. Also makes no sense that when heating it up it would work.
 
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yes indeed,

coudnt see if it was broken, but when you scratch very slightly and it comes of that easy its no good imo.
maby like you said the hot air maby toutch a different part in this case the bad trace got bit hot and connected a little ? just inuf for a small boot.

I now repaired the trace, whit hot tweezers not hot air. placed a new trace and removed the old one. (had a small point where I could connect the wire.
it now boots for 4th time in a row, it didn't do that before.

its now reinstalling the os, ill tell in a bit if its good.
will asd be of any use in this case?
 
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update, making a new trace/wire seems to have fixed the issue.

PM_THRMTRIP_L_R seems this can cause the system not to boot....

boots everytime now.

thanks duke for the help.

maby thrmtrip is something like thermaltrip something.
 
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