820-00165 Drawing 3 Amps

[tlough75]

Got an 820-00165 on the bench with no sign of liquid damage. The board works but when I connect to 85W magsafe it will not turn on. It will turn on with either a 60W or my lab bench PSU 85W plug made from genuine MS2. I checked the ISL and SCL, SDA lines and they measure .529 on Diode and 3.42V. I tried other batteries but still draws 3 Amp with battery plugged in.

 

[2informaticos]

Run HWMonitor and look at voltage and current sensors.
Does it turn on with 85W, in SMC bypass mode?

 

[tlough75]

Things that stand out to me in HW Monitor are:
PECI SA is 0 degrees
CPU VRM E is 0v
Mainboard S0 Rail is 2.89A
Memory module 1 is consuming 1.07W

Battery is charging, just drawing 3Amps of current.

 

[tlough75]

So weird, when the laptop goes to sleep it only draws 1.2A.

 

[tlough75]

It turns on in SMC bypass mode with the 85W on the bench PSU, but not the one that plugs into wall. BTW I strictly use OEM MS2 chargers purchased from a store.

 

[tlough75]

It will also turn on with a 60W MS2 as well. I will try a 45W

 

[tlough75]

Sorry, I meant it will NOT run on a 60W charger. In fact, the only charger is DOES work on is the one that is hooked up to my Bench PSU. It will not run from an 85W, 60W, or 45W MS2. U7100 or U5000 issue?

 

[2informaticos]

Input leakage.
Post R7180/81 and R7185/86 ohm value, measured onboard.
Also check D7012 voltage.

 

[tlough75]

R7180: 100K
R7181: 62.7K
R7185: 470K
R7186: 331K

D7012: 6.83V

I had to replace D7012 just now as it broke. is working with PSU 85W and regular 60W but not 85W

 

[tlough75]

It does not work with OEM 45W MS2 either, Just Bench PSU 85W cable and OEM 60W

 

[2informaticos]

Which voltages get on the board with 45/85W original charger?

 

[tlough75]

Was getting 0v, started measuring components at the beginning of the charging circuit and found R7012 was reading 440K. Replaced it, now running off of all chargers with a green/orange MS2 light. Still have another issue though. The charge current still wants to run away. It starts low then ramps up to 3 Amps, which is the limit for this power supply. So far I have replaced D7012 and now R7012. Still have some hunting to do. I swapped a different board for the client so this one belongs to me now.

 

[2informaticos]

Are you still working with PSU???

Use original charger and check current and voltage with HWMonitor...

 

[tlough75]

Nope, original MS2. Will check voltages with HWMonitor and report back

 

[2informaticos]

"Nope, original MS2."
Where did you see the 3A current then?
Use original Magsafe 2 CHARGER, not only cable!!!