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820-00239 not charging

B

BCN_Techs

Member
Got new touchbar with famous charge issue.

I saw about CD3215C00 ( that chips brings current machine).

Have checked with USB and see that all ports except one recieving 5V and 0,3 A. One port recieves 5V 0,15V.

Is that cd3215C00 issue? I must change only one CD or all 4 ?

Thanks
 
B

BCN_Techs

Member
F7000 about 0.13V, R7020 5V on all pins.

About resistance to ground all are above 1 million except R2836 75K and some more about 100K but i guess it is ok?
 
B

BCN_Techs

Member
Seems like U3100 is responsable for port that is reciving 0,15Amp, so if it is so i have to change all 4 components or just that one? I got wings with donor and have experience in changing smc, reballing etc.
 
J

JohnB8812

New member
No if it is the bad one, only it has to be changed. Do a diode mode reading on PP3v3_G3H and and the LDO lines around each CD3215 to see if one value is lower than all the others. If U3100 has lower readings than the others, it's the one that is bad. But check those measurements first before replacing.
 
2informaticos

2informaticos

Administrator
Staff member
You must always check power rails on diode mode; red to ground first, but need to note value with black probe to ground too.
If get very low values, then switch to 200 ohm scale...
Compare the values on the 4 chips on similar lines.
 
J

JohnB8812

New member
Nice job!!! Unfortunately, we can't mark them solve as only Louis and Duke can. But Duke is gone, and Louis doesn't check the forum regularly because he's always really busy.
 
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