Macbook Pro 2015 820-4924 Drawing 0.08 amps not Turning On

[platinumsteel]

Hi gooday guys.i have a Macbook Pro 2015 820-4924 that is drawing 0.08 amps .My friend told me he was trying to change the keyboard and something touched and he heard a spark.But i don't see any visible signs of corrosion or anything burnt. I have greenlight and orange light on magsafe.Below i have listed the present and missing rails. Hope you guys can maybe lead me on the right track thanks.

PPBUS_G3H = 12.57V
PPBUS S5 HS COMPUTING = 12.57V
PPBUS S5 HS OTHER5V = 12.57V
PPBUS_S5_HS_OTHER3V3 = 12.57V
PP3V42 G3H = 3.42V
PPVRTC G3H = 0V
PP5V S5 = 5V
PP5V S4 = 0V
PP5V S3 = 0V
PP5V_S0 = 0V

PP3V3_S5 = 3.3V

Okay so now while checking the rails for short i left out PPVRTC G3H of U1900. Checking it now on Pin 1 is showing me short and beeping to ground.In diode mode it's reading 0.005V .There is a cap C1910 connected to pin 1 and it's beeping both sides. I am going to remove it and see if that is the culprit.And why PPVRTC G3H is shorted.Will report back if it made any difference.

[mon2]

Re: Macbook Pro 2015 820-4924 Drawing 0.08 amps not Turning On

First, remove the keyboard and trackpad to eliminate them from this puzzle.

Then,

1) Check the power rails on U1900. Pin 1 of this part creates the PPVRTC_G3H rail. Is it hot or any liquid damage ? This part may be defective.

2) Check U7501, rail PP5V_S4 - voltage reading @ L7520, pin # 1 ?

3) Check the U7501, pin 4 = EN ( P5VS4RS3_EN ) - voltage reading ?

[platinumsteel]

Re: Macbook Pro 2015 820-4924 Drawing 0.08 amps not Turning On

Hi mon2 here are the resutls.
voltage reading @ L7520, pin # 1 =0V
U7501, pin 4 = EN ( P5VS4RS3_EN ) = 0V

[platinumsteel]

Re: Macbook Pro 2015 820-4924 Drawing 0.08 amps not Turning On

Well i ended up removing U1900 and pin 1 pad and the caps were still shorted.So removed all the caps on the line.there was about 4 of them.And their pads were still shorted.So at this point i have reached a dead ed and don't know why PPVRTC G3H is still shorted to ground.there are only 4 resistors left on the line .And well am sure you guys might agree resistors don't get shorted right ? So it seems like the PCH is toast that is the only conclusion i can come too.Pin 1 of resistors goes too PPVRTC_G3_PCH ..and that goes directly into the PCH .So can you guys confirm for me yes it is indeed a dead PCH? thanks

[ktmmotocross]

Re: Macbook Pro 2015 820-4924 Drawing 0.08 amps not Turning On

Well i ended up removing U1900 and pin 1 pad and the caps were still shorted.So removed all the caps on the line.there was about 4 of them.And their pads were still shorted.So at this point i have reached a dead ed and don't know why PPVRTC G3H is still shorted to ground.there are only 4 resistors left on the line .And well am sure you guys might agree resistors don't get shorted right ? So it seems like the PCH is toast that is the only conclusion i can come too.Pin 1 of resistors goes too PPVRTC_G3_PCH ..and that goes directly into the PCH .So can you guys confirm for me yes it is indeed a dead PCH? thanks

inject and u will see

[platinumsteel]

Re: Macbook Pro 2015 820-4924 Drawing 0.08 amps not Turning On

Just when i was about to go back into it .I decided to clean the little thermal paste off the CPU and noticed this below.First time i was able to literally see inside the PCH. lol Anyway we were able to find a replacement board for the customer on ebay for a reasonable price. So we will replace it with a used logic board and i will keep this board as a donor .Thanks for the input guys. Sorry i didn't notice this first. Apologies for wasting some of you all time .