Macbook A2289 820-01987

[sourcensolutionsonline@gm]

VIN1/VIN2 = 0.467 correct ,

R6900 is firmly soldered ,when i ran diode mode to ground of R6900 = 0.028 and when I measure R6900 To Ohm its 0.03.

 

[2informaticos]

R6900 is 0 ohm resistor.
How can you get 0.467 and 0.028 diode mode to ground, in the same point???

 

[sourcensolutionsonline@gm]

Yes thats exactly what i am getting , I just used my FLUKE multimeter and what i got it diode mode to groung 0.30 and Voltage is 0.404 on both side of R6900

 

[2informaticos]

So 0.467 was in fact voltage, not diode mode reading.
Please, post end "V" to specify voltage reading.

Looks like you don't get PPBUS_G3H then.
Or you have a broken trace; check continuity from R6900...

 

[sourcensolutionsonline@gm]

Yes will do it from now on , it was 0.467V, See i am observing something very funny with this macbook, if i put it down for a day without connecting the USB amp meter then the next day i go back to it all diode mode reading of PPBUS_G3H is 0.388 And PPBUS_G3H is 12.18 V but the usb meter is still stuck on 5.22V 0.01 amp and 0watts

As soon as I unplug and replug the USB amp meter PPBUS_G3H voltages would drop to 0.406V and all the other power rails would be giving very low diode mode reading as well as PPBUS_G3H Let me check the continuity from R6900

 

[sourcensolutionsonline@gm]

R6900 Does have continuity.

 

[2informaticos]

Yeah, but you didn't specify missing PPBUS_G3H before.

U7000 can generate PPBUS_G3H with just 5V input.
Just check if you always get 5V at R7020.

 

[sourcensolutionsonline@gm]

Yes at R7020 I have checked it more than 3 times , and always get 5.3v there.

 

[2informaticos]

Then post U7000 basic voltages; P_IN, AUX_DET, VDDA/P, SMC_RST_IN, EN_MVR, CBC_ON, A/BMON.
Check them when missing PPBUS_G3H too.

 

[sourcensolutionsonline@gm]

Ok , Let me do that .

 

[sourcensolutionsonline@gm]

P_IN = 5.31V
AUX_DET + 1.224V
VDDA/P=5.13V
SMC_RST_IN = 0.542V
EN_MVR = 0.00V
CBC_ON is U7000 to U7800 no test point or components to test that line
A/BMON= 0.00V

 

[2informaticos]

PPBUS_G3H was there all this time?

 

[sourcensolutionsonline@gm]

NO, PPBUS_G3H was at 0.404V, but if i do not connect the USB Meter with the charger for 24hrs then i will get PPBUS-G3H 12.14 V Thats what i found so weird .

 

[2informaticos]

Remove F7000 and check if you always get stable voltage at C7050.
If not, then change U7000.

 

[sourcensolutionsonline@gm]

OK, will do that.

 

[sourcensolutionsonline@gm]

As I removed F7000 I am getting Stable 12.26V at C7050 , I have tested it more than 10 times to see if it would fluctuate but voltages remain the same , let me know what it is next please.

 

[2informaticos]

Just in case, replace F7000.
It may have internal fracture and fails.

 

[sourcensolutionsonline@gm]

ok, Let me try that.

 

[sourcensolutionsonline@gm]

I replaced F7000, I did not have an exact donor but i got one from macbook Air A1466 , I measured the voltage i am indeed getting 12.26V stable but my amp meter still stuck at 5.22V and 0.001amp and 0.00 watts , so no 20V yet .

 

[sourcensolutionsonline@gm]

any suggestions?