820-4924 als issue.

Yoel Ren

Member
hi, this mac came in pristine, no damage at all anywhere, but when J4002 is plugged in, 10s after booting, mac wil shutdown immediately.
with j4002 unplugged,macbook is normal. when tested with another flex, its normal. any chance to repair this or maybe masking a few line to prevent restarT ?
 
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Yoel Ren

Member
the problem is from the customer's flex. using my known good, everything works..
but replacing the whole assembly isnt viable..
anyway maybe i can fix the flex ?
 

2informaticos

Administrator
Staff member
You may have problem with ALS, simply to solved; just cut off corresponding lines to J4002.
But is not normal the restart symptom in this case.
For this reason I asked you about that voltage; it may drop if there is a problem with camera, or ALS power.
 

Yoel Ren

Member
ok so logicboard died out of nowhere.
pp5v_s5 is cycling.
pp3v3_s5 is cycling.
i have measure pp5v_s5, s4, s3, s0
pp3v3_s5, s4,s3, s0
ppvrtc, and i use thermal cam, but i dont see any short.
is this tps problem ?
 

2informaticos

Administrator
Staff member
"cycling" still means restarting every 10s?
Remove L4010 and check what happens (with original flex).
 

Yoel Ren

Member
ok so q1920 and q1420 is blown. replaced both, macbook turned on, back to square one. j4002 plugged in will cause restart in 10s after booting.
c4013 is 5v, without j4002 conected.
 
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Yoel Ren

Member
okk..
l4010 removed, no more restart.
no ic to blame, too.
as expected, camera doesnt work too.
im quite confused about the conclusion, wheres the wrong ?
pp5v_s0 is 5v, so pp5v3 must be good too.
 

2informaticos

Administrator
Staff member
So you have a problem on camera circuitry, inside LCD assembly.
Resolder L4010 and cut off traces to pins 8 & 9 of J4002.
Just for test, will probably don't help...
 

2informaticos

Administrator
Staff member
Remove C4013, just in case.
Shouldn't be the problem, if machine only restarts when connect the camera cable.

If you connect the same screen assembly in other machine, do you get keyboard backlight and camera works?
 

Yoel Ren

Member
Yes. my own machine ( known good ) doesnt restart with the screen assembly,
but its okay, customer agreed to replace logicboard now..
 
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