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820-3476 high way to hell??

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Hi.
Got a MacBook pro a1502 820-3476 board.
came in for not booting, no damage or signs of liquid damage.
i pluged it in 60w charger green light few seconds later orange light and booting.
battery was 0% but charging
battery status tells its normal and has 375 cycles

send it back

got it back again same issue, but hell also same happening.

customer has 2 chargers and 2 same type of macbooks
chargers Original and working perfect on the other machine.

any idear what could cause this
 
D

dukefawks

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Are you using an original or Chinese fake? Is he using a real or Chinese fake or even some 45W thing? Must be 60W
 
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yes 60w Original, just made sure

funny thing now, i just came back from lunch.

green light, no fan spin, no reaction to keyboard. also usb device turned off

looks like hybernation

unpluged charger and put back nothing happens just green light wont turn orange also.

then unpluged charger and battery, put battery back and pluged in charger, and now it boots.

battery is now 100%
 
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ppbus_g3h 16,34volt
PPBUS_S5_HS_COMPUTING 12.87volt
PPBUS_S5_HS_OTHER5V 12.87v
PPBUS_S5_HS_OTHER3V3 12.87v
PPDCIN_G3H 16.49v
PP3V42_G3H 3.42v
PPVRTC_G3H 3.34v
PP5V_S5 5.02v
PP5V_S4
 
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after removing battery and charger and plugging back in it now gives 12,56 volt (until the idle state)

if i measure r7121/22 they both give 10,3ohm

if i measure r7151 2.3ohm and r7152 0.3 ohm (r7152 should be 0)
still does not make sense (for me) why it boots normal and works normal, and after a while it stops working and ppbus goes high
 
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pin 27/28 gives 20,6 ohms (red 27)

pin 17/18 4,2ohm (red 17) (this should be 2,2 + 0 + 0.005 if I am correct)
 
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hmmm after a long walk in the park with the microscoop.....

Q3080 was missing (thunderbolt ho gives a fuck)

and c2304 looked a little bad, measured and it had a short on ground.
in my opinion this is or has something to do whit S3 state.
PP1V35_S3
need to plugin the board now and see if it keeps on in idle state, but Duke does this sound any way near logic for you
so when the machine goes into sleep/hibernate anything like that it completle shuts down and you can boot it up until the battery dies or is removed....
 
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Beep on both sides but the pad was damaged.

Wel stupid thing is. The 16v on ppbus is not there when i just removed the charger and battery then plug it in. But after i have the machine running for a few hours it greates the 16v
ill hook up the machine later today or Tomorrow and see what it does.
 
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the 16v on ppbus is now 12,59 even when the machine is like sleeping.
but the system wont go out of sleep....
 
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has been cleaned before went over the entire board again. but nothing. (ultra sonic again)

did replace u1950 because it looked like it had a hole in it.


can J5250 cause the system to think the lid is closed and to not respond to getting it out of sleep?
 
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hmm imo nothing wrong with SMC_LID 3.4 volt when lid is open, when lid is closed 0,0001


seems I got a worse case one I gues.

where to start looking, board looks very clean,
 
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wel seems we where on the same page. I before I kicked the system in the ultra sonic I reflowed the smc.

and when I just kicked a button, I came out of the sleep mode......

I think I am gonne cry.

ill tell it again after a few hours if its stil comes out

so not fully convinced yet
 
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oke after a full night on (hibernating/sleep whatever
this morning I came in pressed a button and bling it turned on.
seems either the smc reflow (hot inuf to tap it and make a move a tiny bit)
or the extra ultrasonic did the trick I think
 
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