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Both, three independent motherboards each with its own known good IO Board & Flex Only thing in common between the three is the external known good charger

Looks fine.. starting to wonder if i'm being trolled. Tested known good boards with only fan IO Board and IO Flex attached, each with its own parts independent of each other. Only common denominator is the charger I am using but I doubt that has anything to do with fan speed. All are starting...

Yes known good, runs off battery and charger Everything normal except high fan spin (4.6V FAN_RT_PWM) Thermal sensors appear to test okay, normal voltages compared to known good board - no visible damage. I seen in another thread a user with similar issue was recommended to use "MRI" test...

Tried this, same results

Initially wouldn't turn on , Ran through ultrasonic cleaner now I am here. No more visible liquid or corrosion on board. Current issues - Loud Fan Spin + Slow / Laggy Operation Everything Else Works Fine. From what I can tell I need to run an "MRI" test as ASD is not available for the 2015...

Changed SMC everything appears to be working perfectly now! Thanks everyone

R6950 is good, battery is known good

How can I effectively test if Q7055 is bad? It gets the 12.3V in but does not go out, pin 4 stuck at 12.3V . Pin 5 has a dropping voltage.. Starts around 4v continually lowers, rate of decrease slows as it gets lower.

I noticed on this thread that a similar issue was solved by changing Q7055: https://www.rossmanngroup.com/boards/forum/board-repair-troubleshooting/1110-solved-ppbus_g3h-low-voltage-820-2850-not-charging-fixed-via-q7055 Should I try this before messing around with the SMC?

Yes I can confirm less than 5percent difference on both readings. They are equal.

SCL/SDA lines on diode mode give equal reading ~ .5

Okay I will try this on the SMC, tried a couple new ISL already. Before we confirm SMC anything else I can try? ​​​​​

3.4V looks good

820-3115-B not charging battery ​​​​​​Irregular readings I noticed: ​​​​​​PPBUS_G3H = 12.3V SDA Battery Data Line = 3.2V SMC Reset is Good Is this a bad SMC?

Okay sounds good - Ty Is ti worth trying to inject voltage into the line and looking for heat/short?

Diode Mode: R5281 - .516 R5280 - .607 Diode Mode after Removing D6950: R5281 - .480 R5280 - .574

820-3115-B No Battery Detection I have noticed: R5280 has a resistance of 1.5 instead of 2 , resistor itself is fine Testting at R5280 seems to be where the problem lies if I am not mistaken. PP3V42_GH3 = 3.4V SMBUS_SMC_5_G3_SDA = 2.6V What controls R5280? I am relatively new, I apologize...

Okay , and just to confirm by correct values you mean same values on pin 4 & 6? Not necessarily 400-450 until everything is connected normally. Also just wanted to say thank you for all your help thus far - very much appreciated!!!

Okay -- I reinstalled the same D6950 but left the ISL6259 removed. New readings are: Pin 4 Diode Mode - .530 Pin 6 Diode Mode - .620 Does that mean anything or are we still looking towards the SMC as the issue?

Okay I will try that Normal readings on Pin 4 & 6 should be .5 & .5 respectively?