schematic for 820-2796-a macbook air 11 2010

[highpulse]

well this come from another store , they told us they have replaced the entire top cover with keyboard , since the outher one was with the small board attached near the touchpad full of corrosion due to waterdamage , they order another one , and doest not turn on , we UC the board and seems with a good aspect , but now still not turn on ,

for what i've measured i only got one coils with 8.35 volts , in this case L7030 , on the Q7030 on the drain got 16 volts , on the source it drop to 8.35v .

trying to find out also were is the g3hot pin for i can make a direct jumper to see if it start.

i got the correct board view but the wrong schematic

[dellxps15]

Re: schematic for 820-2796-a macbook air 11 2010

try this: http://www.informaticanapoli.it/down...B%20K99%29.pdf

tnx to napoli from italy

[highpulse]

Re: schematic for 820-2796-a macbook air 11 2010

forgot to mention i found it minutes after posting this post .

im with some doubts , i know you are a pro on maxs , dellxps

cheked that the big coil near the 3ghot u6990 , have 8.35 volts , is that normal ^? and were is the G3hot pin for i can make contact to see if it work

[dellxps15]

Re: schematic for 820-2796-a macbook air 11 2010

look board view
press N

smc_onoff_l

probe 666 . short with pin 2 of r5014.

[highpulse]

Re: schematic for 820-2796-a macbook air 11 2010

dellxps , ok got 3.,42 on once i shunt between gnd and the 3.42 pin , drop to 0 , but machine does not turn on . wich things you think i should fallow first , on regular laptop i know were to move and what to chek , macs im not expert , its like im newbie in macs , so any help will be welcome

[dellxps15]

Re: schematic for 820-2796-a macbook air 11 2010

very simple : on page 3 of schematic there is the power sequence.

check for 3.3 volt if present or not.

edit: macbook air work with 8.5 volt so 8.5 volt are ok.

[highpulse]

Re: schematic for 820-2796-a macbook air 11 2010

ok , i found here that bios as any voltage present , should have at pin 8 of u6100 3 volts but nothing is present.

btw meanwhile i went to chek the main regulator and found that r7260 one of the sides was green due to the oxidation , trying to clean it well but i think this resistor it broken in one side , finding a matching Resistor will be hard , it have a none regular value

[dellxps15]

Re: schematic for 820-2796-a macbook air 11 2010

the smaller resistor kit i have found are 0402. i think 0201 and 010x are not available right ?

[highpulse]

Re: schematic for 820-2796-a macbook air 11 2010

they are way to small , i found another mac board , i found a very near resistor 22k but they are bigger than the one on the macbook air , dont fit .

Altough , i got 1.20 on does places were both resistor are , and both are damaged 10k and 23.2k ,
and no 3.3 on bios , or on the coil

[dellxps15]

Re: schematic for 820-2796-a macbook air 11 2010

u7201 is for 3.3 . 5volt present after power on.

no 3.3 on bios is not ok if it's a core duo.

new i5 i7 have 0volt on bios . volt comes only afer pressing power botton.

[Mogli1476]

Re: schematic for 820-2796-a macbook air 11 2010

Hey @all!
I have the same liquid problem on my MacBook Air 11inch Mid2011 i7. After liquid spill of milk the bokk won't turn on. cleaning everything with isopropanol but nothing happens. Now i found a missing part on the logic board and need the schematic and board view to identify.
Does anybody have both for me? It's a A1370 Model.
Thanks a lot and best regards, Mike

[dellxps15]

Re: schematic for 820-2796-a macbook air 11 2010

hi post mainboard pictures with good quality and mark where milk or oxidation zone u had.

[horiparts]

Re: schematic for 820-2796-a macbook air 11 2010

Hello
I have a macbook A1370 820-2796
Keyboard and touchpad do not work
I already did all the checking and everything is looking correct according to the schematic.
I changed the touchpad, the flat, and the board underneath the touch.
all voltages are correct
but it still does not work
Anyone have any suggestions on what the problem might be?