820-00165 green/orange light, no fan spin. SMC bypass works!

kevinklinkmuller

New member
Hi there!

Have 820-00165 green/orange light, no fan spin. SMC bypass works. Was pretty corroded in some places. thought i'd try my luck with the ultra sonic but same issue
So must be a sensor as I understand it?

thanks!
 

kevinklinkmuller

New member
I should mention, before it died the customer told me that it would only work with power supply plugged in. Would cut out as soon as it's disconnected.
 

2informaticos

Administrator
Staff member
Post U7100 voltage, pins 2, 3, 9, 12, 13, 15, 26; only charger connected and also charger + battery.
Check resistance between pins 17/18 and 27/28 (ohm mode).

Also post PPBUS_G3H and 3V42 voltage on battery only.
 

kevinklinkmuller

New member
Charger only:

pin 2 = 20v
pin 3 = 5.3v
pin 9 = 0.03
pin 12 = 3.4
pin 13 = 3.3
pin 15 = 0.06
pin 26 = 19.26v

Same result with battery and charger connected

Pin 17/18 3.3 ohms
pins 27/28 20 ohms (seems high?)

3v42 is 3.4v on battery
PPBUS_G3H 7.3v on battery
 

2informaticos

Administrator
Staff member
Are you using original Apple Magsafe 2 charger?
Input voltage is too high even for 85W charger.
Try a known good one, 60W if possible.
 

kevinklinkmuller

New member
AVREF_SMC is good at 3.3

Nothing at PBUS_S0_VSENSE because there's no SMC_sensor_PWR_EN

DCIN_S5_VSENSE is 2.8V

SMC_CPU_VSENSE 0V

SMC_P1V05S0_VSENSE 0V (I'm guessing all S0 are down for obvious reasons)

SMC_CPUDDR_ISENSE 0V

SMC_P3V3S5_ISENSE 0V




How would it be possible to check sensors that rely on S0 rails if the machine isn't turning on hmmmm
 

2informaticos

Administrator
Staff member
SMC_DCIN_VSENSE is now OK.
Check SMC_DCIN_ISENSE and SMC_BMON_ISENSE.
No pulse at all at L7520 when SMC_ONOFF_L is triggered?
 

2informaticos

Administrator
Staff member
It should pulse at least, when SMC_ONOFF_L is triggered.
Check first if PM_PWRBTN_L reacts.

"retesting with orignal chargere"
Original Magsafe 2???
You can use bench power supply, with Magsafe 2 cable only.
Never test with Magsafe 1-->2 adapter.
 
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