macbook a1708 820-00840

[ipetro]

HI. I need help with this board! 5v/0a stable. Replacing the u7000 did not change the situation. Before I move on to replacing the SD3215, maybe there are some tips on what to pay attention

 

[ipetro]

PPBUS_G3H=0.002v/diod=0.402
all indicators on the coils are normal and there are no short circuits

 

[2informaticos]

Remove F7000 and check C7050 voltage.

 

[ipetro]

Remove F7000, C7050=0.002V(pin1)/C7050=0.005V(pin2)

 

[ipetro]

there may be a problem in the CD3215, it does not switch to 20V

 

[2informaticos]

You should get C7050 voltage even with 5V input.

Post U7000 basic voltages: P_IN, AUX_DET, SMC_RST_IN, VDDA/P, EN_VR1, SMC_RST*, AUX_OK, A/BMON.
Keep F7000 removed.

BTW, put some logic on your job; avoids wasting time.
"C7050=0.005V(pin2)"
I can't still believe that you've checked GND to GND voltage!

 

[ipetro]

I'm sorry I wrote it wrong
Removed F7000, F7000=0.002 V (pin 1)/F7000= 0.005 V (pin 2).

 

[ipetro]

to exclude the u7000, I removed it from the fully working board and placed it on this board, but the result is the same.
U7000
1=0.002V
2=5.07V
3=0.002V
4=0.007V
5=4.76V
6=0.002V
7=0V
8=0.002V
9=0.003V
10=5.07V
11=4.81V
12=0V
13=0V
14=0.003V
15=4.75V
16=0V
17=5.07V
18=1.26V
19=0.004
20=5.07V
21=0V
24=0V
25=1.128V
26=4.76V
27=5.07V
28=3.4V
29=0V
30=3.4V
31=0.002V
32=0V
33=3.38V
34=5.07V
35=2.7-3.4V unstable
36=0.002V
37=0V
38=3.4V
39=3.4V
40=2.7-3.4V unstable

 

[2informaticos]

Please, use schematic notations!
I have 10-20 schematics opened in Acrobat Reader, but I don't want to open boardview for each one.
You are the one working on the board and need the boardview.
The schematic allows to interpret the measurments, not the boardview!

 

[ipetro]

ok I have a diagram and boardview 820-00840 but as I understand it it’s 820-00840-1

 

[ipetro]

Let's get back to the board problem!
P_IN, =apparently you mean PPVIN_G3H=4.76V
AUX_DET, =apparently you mean TBA_AUX_DET=1.26V
SMC_RST_IN =0V
VDDA/P, =apparently you mean TBA_VDDA=5.07V and TBA_VDDP=5.07V
EN_VR1, =apparently you mean BANJO_ENVR1=0.031V
SMC_RST*, =apparently you mean SMC_RST_IN=0V
AUX_OK, =apparently you mean SMC_AUX_OK=3.4V
A/BMON.=apparently you mean CHGR_AMON=0.004V and CHRG_BMON=0.003V

 

[2informaticos]

You do NOT have 00840 schematic.
Is just renamed 00875 schematic; the only one available.

"apparently" no, is just what I meant.
Take less time using U7000 internal names than external ones; however easy to follow on the schematic.

Check diode mode to ground at C6990 and L6995.

 

[ipetro]

C6990 =0.515
L6995=0.324

 

[2informaticos]

3V3_G3H must come first, before PPBUS_G3H.
For some reason, U7000 doesn't enable it.

"SMC_RST*, =apparently you mean SMC_RST_IN=0V"
Look better at schematic.

Some U7000, or U6990 adjacent component may be bad; or trace.
What is C6990 voltage?

 

[ipetro]

SMC_RST_IN=0V
SMC_RST_BTN_L=0V
SMC_RST_R_L=0V

 

[2informaticos]

Why do you insist so much with boardview?
Don't you want to see U7000's corresponding signals directly in schematic (all at same time)???

And yes SMC_RST_L is the expected signal for SMC_RST*; not visible on boardview, of course.

"Some U7000, or U6990 adjacent component may be bad; or trace.
What is C6990 voltage?"

 

[ipetro]

I apologize for my inexperience, but I’ve been with you for three months and don’t have the knowledge that is obvious to you!

 

[ipetro]

PPVIN_G3H_P3V3G3H=4.76V

 

[2informaticos]

If U7000 is good for sure and properly soldered, it should enable 3V3_G3H power supply.
Check/replace C7071 and R7008/76/77.

Also check/replace all R/C/Q7030/40.

 

[ipetro]

I'm changing t2 chips so something like u7000 or cd 3215 is too easy! there, no less, to exclude the u7000, I removed it from a fully working machine and checked in diode mode all the indicators around it were normal; the u7000 removed from this board works perfectly on the donor board. I turn off u7000