[SOLVED]820-3476-A No Power on...

[Aldizi]

Green light turns on and then turns to orange. Even with no battery plugged in. The customer states no liquid dmg but smelled something burning. I looked for any signs of damage thoroughly under the scope Looks brand new. I checked the 2 power rails this is what i have so far.
PP3v42_g3h is present
PPbus_g3h i get 16 volts till it gets to the u7100 chip after f7140 and before i get .0754 ? is this normal or is voltage here only present when lcd is plugged in ?? is u7100 messed up ?

This is my first real customer board...

 

[Aldizi]

When i put multi meter on diode mode and probes on f7140 there seems to be a short to ground... reading starts at .089 then drosp to zero.

 

[Aldizi]

When i put the power to it wont let me go past 2.4v and stuck at 5 amps

 

[dukefawks]

Well, F7140 is dead for sure and 16V on PPBUS is what killed it. Also putting 5A into the board something must heat up, find that first because I suspect it may be the CPU

 

[Aldizi]

Duke the caps next to the CPU are blown to shit!! How do you know these things its a miracle!

 

[Aldizi]

They were covered by a tape...

 

[dukefawks]

Sort out the issue on PPBUS first, it should never be higher than 12.6V!

 

[Aldizi]

I need a donor board for this macbook and cant find one... where should i look ?

 

[Aldizi]

Duke after i removed the bad caps im getting 12.56 on f7140 like you said...

 

[Aldizi]

No Title

 

[dukefawks]

ok, replace cap and it should work I think.

 

[Aldizi]

No Title

Add another to the List thanks DUKE!!!