MacBook Air 13" - 820-00165-A - not turning on/orange light - u6100 corroded

[quasimodo]

Hey guys,

hope you can help me with this one.

Board is looking nice, except u6100 area.

PP3V3_S5 is present

P3V3SUS_EN is not present...?!

PP3V3_SUS is like 0.01V

Should i replace U6100 directly? Or any other options first to check?





Thank you!

 

[2informaticos]

You must clean the corrosion and replace damaged components.
Remove U6100, clean its pads and ones from board; check traces continuity and resolder back the chip.
Check diode mode to ground on 3V3_SUS; w/ and w/o U6100 in place.

Do not reflash BIOS yet.
Only change U6100 if it causes short.

 

[quasimodo]

Hi!

Just gave some flux and hot air to the U6100 to see what happens: (had light before the whole time)

no light at all - and i discovered that u7090 looks like shit




hows that/is it possible?!


replace u7090 and fix traces - should be a working machine?!

 

[2informaticos]

U7090 is the 3V42_G3H power supply.
Did you test the machine now?

 

[quasimodo]

update:

replaced u7090; jumper wire to r7080

PP3V42_G3H is 1.7V

PPBUS_G3H is 0.5 something


what´s going on with this machine?

 

[2informaticos]

Post U7090 voltages.
Also check diode mode to ground at 3V42_G3H and PPBUS_G3H.

 

[quasimodo]

pin 6, 8: 2,7

diode mode to ground: both: 0.333

 

[2informaticos]

Check R/D7005...

 

[quasimodo]

fixed! R7005 replaced. ty!