Macbook pro A1278 green light but no power

[robertpritchard]

Re: Macbook pro A1278 green light but no power

PPBUS_G3H 5.29
PP3V3_S5 148 one side and 0 on the other
PP5V_S5 612 one side 502 the other side
PP5V_SUS 610 and 525
PP3V3_SUS 708 and 469
PP3V3_S4 421 and 421

PP5V_S3 497 and 0
PP3V3_S3 377 and 0
PP1V5_S3 641 and 143
PP3V3_ENET 401 AND 0
PP3V3_WLAN 530 AND 0
PP5V_SW_ODD 0 AND 0
PP5V_S0_HDD_FLT 448 AND 448
PP3V3_S0_LCD_F 375 AND 0
PP3V3_LCDVDD_SW_F 714 AND 0
PP4V5_AUDIO_ANALOG 589 AND 0
PP1V05_S0 008 AND 0
PP1V5_S3RS0 138 AND 0
PP1V8 S0 245 AND 0
PP3V3_S0 372 AND 0
PP5V S0 445 AND 0
PPVCCSA_S0_CPU 006 AND 0

sorry thanks for having patience with me

[dycc]

Re: Macbook pro A1278 green light but no power

DON't understand your reading. you need to connect(fixed) the black probe of your multimeter to ground . and the red probe to the lines i mentioned one by one . and give reading on diode mode

[dycc]

Re: Macbook pro A1278 green light but no power

if PPBUS_G3H is 5.29 on diode mode it's a short on that line

[dellxps15]

Re: Macbook pro A1278 green light but no power

ppbus_g3h is not shorted since it has good 12.5 volts.

report bios pins voltages.

[dellxps15]

Re: Macbook pro A1278 green light but no power

double post sorry

[robertpritchard]

Re: Macbook pro A1278 green light but no power

PPBUS_G3H 0
PP3V3_S5 1471
PP5V_S5 0
PP5V_SUS 0
PP3V3_SUS 645
PP3V3_S4 0

PP5V_S3 1586
PP3V3_S3 0
PP1V5_S3 122
PP3V3_ENET 1237
PP3V3_WLAN 0
PP5V_SW_ODD 0
PP5V_S0_HDD_FLT 0
PP3V3_S0_LCD_F 688
PP3V3_LCDVDD_SW_F 1739
PP4V5_AUDIO_ANALOG 0
PP1V05_S0 7
PP1V5_S3RS0 121
PP1V8 S0 380
PP3V3_S0 687
PP5V S0 0
PPVCCSA_S0_CPU 5

i was testing with red on ground in my last test i thought that was write sorry
these are write now

[robertpritchard]

Re: Macbook pro A1278 green light but no power

u7200 does look pretty bad if that helps

[robertpritchard]

Re: Macbook pro A1278 green light but no power

every Louis Rossmann and every other video says diode mode is red to ground does this mean there all wrong

[dycc]

Re: Macbook pro A1278 green light but no power

WEIRD !!!!! you said ppbus_g3h 12.5v and on diode mode 0V ?????????????
are you sure you are doing theses tests while adapter disconnected ?????

[robertpritchard]

Re: Macbook pro A1278 green light but no power

yes in diode mode with black to ground its 0
with red to ground its 515

with power connected i get 12.5v

[dycc]

Re: Macbook pro A1278 green light but no power

give picture of how you are doing theses tests

[dycc]

Re: Macbook pro A1278 green light but no power

yes in diode mode with black to ground its 0
with red to ground its 515

with power connected i get 12.5v

which value do you get on multimeter on diode mode when probes(black and red) in the air (without touching any components)

[robertpritchard]

Re: Macbook pro A1278 green light but no power

1

[dycc]

Re: Macbook pro A1278 green light but no power

give ohm values of the S5 S4 and SUS lines . wanted to be sure there is no short at theses lines before we go further more

[dycc]

Re: Macbook pro A1278 green light but no power

1

OK SO IT MEAN THAT IF YOU TOUCH THE PROBES TOGETHER (SHORT) YOU WILL GET 0 . also mean that if you put red probe on ground and black probe on ppbus_g3h and have 515 , so you should not have 0 if you reverse ( mean red probe on ppbus_g3h line and black probe on ground )

[robertpritchard]

Re: Macbook pro A1278 green light but no power

Pp3v3_s5 10.04
pp5v_s5 2.45
pp5v_sus 1.76
pp3v3_sus 2.31
pp3v3_s4 0.00

thanks

[dycc]

Re: Macbook pro A1278 green light but no power

also wanted to say BIOS is not involve at this stage (at sus state bios is supply) . S5 state is not OK so you will never have the other state . normally it is in this order G3 S5 SUS S4 S3 and S0 last

[dycc]

Re: Macbook pro A1278 green light but no power

Pp3v3_s5 10.04
pp5v_s5 2.45
pp5v_sus 1.76
pp3v3_sus 2.31
pp3v3_s4 0.00

thanks

ohm or Kohm??????????

[robertpritchard]

Re: Macbook pro A1278 green light but no power

ok thanks im just learning might take me a bit,, i work full time but im at it day and night its 230 here and i cant sleep i just keep playing

[robertpritchard]

Re: Macbook pro A1278 green light but no power

ohmi put it on 20k to test