Macbook Air A2681- 820-02536 - 5V 0.03A

[ronaldo]

I need some help, please.
The Mac has no signs of life. There is no liquid and no short anywhere on the board.
All the coils measurements in diode mode are matching with the measurements on the FlexBV.
I've tried to connect to another Mac, but it won't recognise it.
Both USB-C ports are getting 5v and 0.0310A

PP3V3_UPC1_LDO - 3.44V
PP3V3_S2_LDO - 0V
PP1V5_UPC1_LDO_CORE - 1.57V

Thanks

 

[2informaticos]

What about PPBUS_AON and 3V8_AON?

 

[ronaldo]

PPBUS_AON - 0V - 0.527
PP3V8_AON - 0V - 0.347

 

[2informaticos]

Post U5200's basic voltages: P_IN, AUX_DET, SMC_RST_IN, VDDA/P, EN_MVR, AUX_OK, A/BMON.

 

[ronaldo]

P_IN : 5.16V
AUX_DET: 0.85V
SMC_RST_IN: 0V
VDDA: 4.39V
VDDP: 4.38V
EN_MVR: 0V
AUX_OK = 0V
A/BMON = 0V , 0V

 

[ronaldo]

Just in case, I've replaced the U5200 - RAA489900. Replaced by the ISL9240 the pins listed and VDDIO voltage in schematics are the same.
But same as before. No changes in the voltages.

 

[2informaticos]

Not sure if ordinary ISL9240 works here.
That one expects 1.25V aprox on AUX_DET.
Your board works with 0.85V there; valid for 5V input.

Remove F5200 and check C5252 voltage.

 

[ronaldo]

Ok. I will put the correct U5200 back.

 

[ronaldo]

Removed F5200 and voltage on C5252 is 0V.

 

[2informaticos]

So your problem is on U5200 area.

 

[ronaldo]

I've checked all the components in that area and everything seems fine.
All measurements in diode mode match flexbv.
Only CHGR_GATE_Q1_R which on flexbv is 0.650 and on my board is 0.901. But I don't think this is a problem.

 

[2informaticos]

Did you solder correct U5200 chip?

 

[ronaldo]

Yes, I did.

 

[2informaticos]

I mean RAA489900, not ISL9240.
Post again its basic voltages.

 

[ronaldo]

Yes, RAA489900 is back.
All the voltages are the same.

 

[2informaticos]

You may have problems with R/C/Q5230/40, or traces.
Also check R5251-4.
If all good, try another U5200.

 

[ronaldo]

RAA489900/Q5230/40 replaced and it works fine.

Thanks