A1398 820-3332-A no power

hgoncalves

Active member
Hi,

I have an A1398 820-3332-A that has no power.
I have green light, no fan spin and it pulls 0.10A from bench PSU.
No voltages on big coils.

PP5V_S5 = 5V
PP3V3_S5 = 3.3V
PP5V_SUS = 0V
PP3V3_S3 = 0V

Can you help?
 

2informaticos

Administrator
Staff member
Any history available?
Do you get 3V3_SUS?

Be aware, this board requires 85W charger to turn on, without battery.
 

hgoncalves

Active member
Hi,
No history. Stoped working overnight. I saw a bit of corrosion oc C5856 (not shorted), but everithing seams ok besides that.
I don't get 3V3_SUS (0V).

Even with the board on bench PSU, it doesn't power on (with or without battery).
 

2informaticos

Administrator
Staff member
Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L.
If detected, check for pulse at PM_SLP_S4_L, at same time.
 

hgoncalves

Active member
Hi,
I don't get a drop pulse on PM_PWRBTN_L when trigering SMC_ONOFF_L. It stays steady at 0.333V.
On U5010 i get 3.4V on SMC_ONOFF_L
 
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2informaticos

Administrator
Staff member
"It stays steady at 0.333V"
Of course, impossible to drop from 0V to 0V.
Must find why PM_PWRBTN_L stays always low; should stay at 3V.
Check R1985...
 

hgoncalves

Active member
Hi,

While measuring R1985 after a few days, (witch is ok btw with 1kohm), the mac started to power on, and now I get 3.3V on PM_PWRBTN_L...

Everithing seams to be working ok. What shal I check to make sure that everithing is OK?
 
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