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820-00165-A A1466 2015

L

lincev

Member
Hi guys, I have a problem with this logic board, it works with battery (25 cycles) when disconnecting the magsafe it takes a few minutes and the computer turns off. With magsafe it can work all the time.

In system information it recognizes the battery and the percentage goes up when it is charging. I have also tried a new battery but same problem

any ideas? thanks so much
 
2informaticos

2informaticos

Administrator
Staff member
Did you test with original and fake charger too?
What voltages do you find on the board, with charger alone?
 
L

lincev

Member
genuine magsafe 61w

some voltages:

PPBUS_G3H=8.53v
PP3V3_SUS=3.30v
PP5V_S0=5.06v

U5110
1 PP3V42_G3H=3.40v
3 PP3V42_G3H_SMC_SPVSR=3.39v
4 SMC_MANUAL_RST_L=2.70v
5 SMC_RESET_L=3.36v
6 SMC_LSOC_RST_L=3.38v
7 SMC_ONOFF_L=3.39v
8 PP3V3_S5_AVREF_SMC=3.26v

U7501
12 SMC_PM_G2_EN=3.39v
13 P5VP3V3_VREF2=1.97v

21 P3V3S5_EN_R=3.39v
22 P5VP3V3_VREG3=3.26v
23 PPBUS_S5_HS_OTHER_ISNS=8.53v

29 PP5V_S5=4.99v
 
L

lincev

Member
yes, L7310=1.22v

The device works perfectly with MagSafe, it never turns off or restarts. But with a battery it barely stays on for a few seconds/minutes.
 
L

lincev

Member
If the percentage increases and it seems real, but now we have tested it with an old battery, 1014 cycles, recommended repair, it has charged up to 18% and has not turned off for a few minutes and is at 13%, a very curious case... the first test was with a new, unused battery and it did not work...

We will do more tests and we will inform you, sorry and thank you
 
L

lincev

Member
Well, I can confirm that we have tested used original batteries and new compatible ones with the same result. The problem only appears if we connect the trackpad and keyboard. We have tested 2 topcases from other computers in good condition and it continues to happen. I can confirm that the problem is with the logic board.
 
L

lincev

Member
pins 17/18=04.0 (scale 200)

pins 27/28=40.4 (scale 200)

I have been able to observe some corrosion on the U3210 that my colleague overlooked. I have cleaned the area and installed the new R3211 because cleaning made it disappear but the problem has not improved.
 
L

lincev

Member
I have already checked those resistors and they are fine, but I have checked the line and the C7120 has continuity. I have removed the component and I still have continuity between its pins 27/28, therefore I think that the U7100 is damaged. Do you think the same?
 
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