820-2850 dim green light.

[2informaticos]

Post ISL6259 basic voltages; charger only, no battery...

 

[Chuck60]

Ok thanks. I?ll get back to you when I get home

 

[Chuck60]

U7000
1-chrg_agate=14v
2-chrg_dcin=16.7
3-chrg_acin=1.5mv
4-chrg_vfrq=8.5mv
5-chrg_iconp=8.4mv
6-chrg_cell=.8mv
7-chrg_vcomp=.6mv
8-chrg_vneg=370mv
9-chrg_Amon=.1mv
10-smbuss_smc_bsa_sda=3.38v
11-smbus_smc_bsa_scl=3.32v
12-pp3v42_g3h=3.42v
13-chrg_rst_L=3.1-3.9 fluctuating
14-smc_bc_acok=140mv
15-chrg_Bmon=46mv
16-chrg_bgate=77mv
17-chrg_cso_n=380mv
18-chrg_cso_p=380mv
19-pp5v1_chrg_vdd=6mv
20-pp5v1_chrg_vddp=6mv
21-chrg_Lgate=220mv
22-gnd
23-chrg_phase=380mv
24-chrg_Ugate=380mv
24-chrg_boot=500mv
25-chrg_sgate=16.4v
26-chrg_csi_n=.7mv
27-chrg_csi_p=.7mv

im sorry I just wanted to give all the info that I could thank you for your time and effort resolving this issue. I know the boards are old. I know they?re worth nothing but I?m taking this opportunity to add to my repair knowledge. Hopefully I will be able to return your kindness in the future thank you and the community

 

[2informaticos]

"3-chrg_acin=1.5mv"
There should be aprox 4V.

"19-pp5v1_chrg_vdd=6mv
20-pp5v1_chrg_vddp=6mv"
And 5V there.

So start checking diode mode (red probe at ground) on these points.
If nothing strange, then check R7010; could be open, because of corrosion.

 

[Chuck60]

May I ask you something? When chrg_dcin=16v shouldn?t it output 5v on vdd ? Or am I confused about the operation of this circuit

 

[2informaticos]

No datasheet available for ISL6259.
But the other charger chips do not generate VDD untill ACIN is correct.
Is supposed to be valid for this one too...

 

[Chuck60]

Ok I?ll take the readings and check R7010

 

[Chuck60]

R7010 On pin 1 16.75v on pin 2-20mv
r7011 pin 1-20mv
i removed Both resistors
r7010=29.5k
r7011 =38ohms in circuit
r7011 =9.25 out of circuit

 

[Chuck60]

I also did continuity test on a the v?as and all test good :/ I thought maybe the via where bad. Odd because I see no sign of water except near touch pad but even that was very little

 

[Chuck60]

Oddly enough u7000 pin 3 .042v diode mode even when I remove both r7010/r7011 is this right? I have .549 on a 820-3115 board at the same point. The dot being pin 1

 

[2informaticos]

"r7011 =38ohms in circuit"
Remove C7011.
If works, you are lucky; not even need to change it.
If not, change ISL6259.

 

[Chuck60]

Ok so I remove c7011 I get 16.6v on pin 2 of r7010 to isl6295 I?m guessing it?s not good any longer

 

[Chuck60]

Can I use a similar one from 820-3115b ?

 

[2informaticos]

C7011 is not critical, let it out.
But need to replace R7011, seems to be bad.
Or maybe broken/corroded trace.
You should get aprox 4V there.

 

[Chuck60]

Good morning soo I replaced the isl6529 before I saw your comment. The isl was shorted on pin 3 now I have 3.9 at acin. The light was dim even after the change and now checking around the mosfet I heard a ?click? and the MagSafe light turned a normal green and ppbus_g3h had 12.5v then died again. Bad solder joint ? Or MOSFET ?

 

[2informaticos]

"The isl was shorted on pin 3 now I have 3.9 at acin"
You had just a bad C7011.

Bad solders, or knocked off components around ISL6259 could now generated more damage on the board.

Did you solder good R7011???

 

[Chuck60]

Yes I did solder it well. I have 4v at the voltage divider. I tried without c7011 it gave me 16v at pin3. I replaced it with another c7011. are you saying I switched isl 6529 for no good reason?

 

[Chuck60]

Now after I changed isl6259 I have 4v at pin 3 I looked around all the components are still in their place I?ve double checked.

 

[Chuck60]

I noticed R7086 pin2 has 12v at chrg_agate and Nothing on output Ppdcin_g3h_inrush at q7085