820-4924 wont charge battery intermittent green light

[dukefawks]

Bad trackpad cable is first suspect then the trackpad itself.

 

[Gannons3]

wasnt the cable, trackpad coming tomorrow. also i noticed that the battery reads 0% all the time in energy saver. i tried a new battery but still the same thing. but im getting 3.42v on both data line resistors to the smc. 1 line pulses the other doesnt. the computer runs off the battery but i cant tell if it charges it or not. the light never goes to green even after being left in for hours. ppbus_g3h is 12.1v with battery in 12.5 without

 

[JohnB8812]

Sounds like bad battery or really REALLY dead battery.

 

[Gannons3]

it cant be dead because the computer runs off of it, had it on for over 20 mins. also a new battery didnt make a difference.

 

[Gannons3]

okay scratch the battery issue resolved now

 

[Gannons3]

wasnt the trackpad either. anymore ideas? SMC Reset works

 

[Gannons3]

i get all power rails everywhere im supposed to on the trackpad connector and the keyboard connector also both 4830 and u4820

 

[dukefawks]

Diode mode on all trackpad connector pins? It is also common for "new" trackpad cables to be DOA. I had a bunch of garbage cables from China last time I ordered them.

 

[Gannons3]

1,3,5,7,9,11,13: Ol
2,4,6,8,10,12,14: 0
15,16,17,18,24,30,31,32,33,34,39,40,47,51,52: 0
19:.840
20: .750
21: .731
22: .755
23: .733
25: .567
26: .493
27,29: .420
28: .468
35: .444
36: .482
37: .443
38: .750
41: .707
42: .551
43: .653
44: Ol
45: .678
46: .809
48: .552

 

[Gannons3]

r4902 was ripped off the board. i now have trackpad

 

[Gannons3]

1 last issue. computer now turns on keyboard and trackpad works, but the fan goes to max and its kinda sluggish. Im guessing sensor issue but i have no idea where to start. 2015 model so no way to run sensor check software

Edit: when i hold down the d key for diagnositic. it says "no issues found".

 

[dukefawks]

If the fan is running on max. ASD should at least report a fan issue. Not sure but was the SMC replaced?

 

[Gannons3]

Yes smc was replaced, but according to the customer it was running fan on max before they brought it in. Asd said no issues found when i ran it last. Ill try again though just to be sure

 

[Gannons3]

yeah still says no issues found but fan still goes to max and it takes like 3 seconds before the volume will go up or down and show up on the screen

 

[dukefawks]

Install iStat and see if it sees any sensors that read weird.

 

[Gannons3]

all sensors reading except palm rest is blank and right fin stack is blank aswell. everything else is reading normal temps

 

[Gannons3]

says ppbus is 7.2v also says dcin is drawing 6.14 amps

 

[dukefawks]

6 amp seems too high. The missing temp is probably iStat being stupid as that would give an ASD error for sure. 6 amps is possible on the lower voltage rails so it could also be a mistake in iStat. I'm at a loss with this one. Was the SMC replaced with the correct one? Got access to an AASP that can do an MRI for you?

 

[Gannons3]

No idea what either of those acronyms mean so ill say no. Im pretty sure the smc was correct but they were bought from aliexpress. I also noticed that closing the lid wont put it to sleep either. This could very well be a bad smc. I can try another after work

 

[Gannons3]

the smc is confirmed as the correct one, ill try another one that i have and hope that does the trick