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820 3115, no green light

N

Noguinfor

New member
Hey,

working on 3115 board with no green light. No signals Liquid damage, board very clean!

PPBUS = 12.30V
PP3V42_G3H = 3.42V
PPVRTC_G3H = 3.4V
PP5V_S5 = 0.42V - No short 430v - Diode_mod
PP5V_SUS = 0V

already reflow SMC - no changes

already test with power supply on this board and consumes only 0.008A..

ideas?? TPS51125 problem?? i don't do anything on this board i need the right direction.

thank you
 
N

Noguinfor

New member
SMC_RESET_L = 3.449V
SMC_BC_acok = 3.4V
sys_onwire = 3.4V
adapter_sense = 3.4V
SMC_PM_G2_EN = 0.133V
SMC_ADAPTER_EN = 0V
 
N

Noguinfor

New member
Already reballing SMC and replaced for a donor board!! Same history.. PPBus still 12.32V! Probably this SMC it's Bad!! there's something else I can do before I replace to another one??

thanks
 
J

JohnB8812

New member
PP3v3_S5 present? If so, check rails for shorts a common is PP5v_S3 audio caps which can cause the green light to have issues.
 
N

Noguinfor

New member
JohnB8812 touch on the spot!! i have a partial short on PP5v_S3!! Diode mode i have 139v ... i have one working board and i have 439v on the line!

i put 3v on this line and u7200 start to heat a little but i don't have others components heating!! i take off u7200 put the 3v and DC power don't consume (A)!

SMC_BC_ACOK - floating 2.9 - 3.4 V


any advice ?
 
N

Noguinfor

New member
ya, i don't have green light yet... when i plug the charger i have a green light for 1 sec and then goes off!! already replace again u7200!! and noo changes!!
 
N

Noguinfor

New member
U6900

1- SMC_BC_ACOK_VCC = 3.340V - 3.484 Floating https://drive.google.com/file/d/1ynHbGna1dnDmAm6pmcYCerOcK7DsGr9Z/view?usp=sharing
4 - SYS_ONEWIRE - 2.800V - 2.980V - Floating
5 - ADAPTER_SENSE - 2.800V - 2.980V - Floating

u6901

1- SMC_BC_ACOK_VCC = 3.340V - 3.484 Floating
2-1- SMC_BC_ACOK_VCC = 3.340V - 3.484 Floating
4- SMC_BC_ACOK_VCC = 3.490V
5- =PP3V42_G3H_ONEWIREPROT - 3.340V - 3.484 Floating

With my experience when the voltages are floating on this case i think i have a short problem in some line!
 
N

Noguinfor

New member
Already replaced magasafe for a new on.. Replace q7260 and q7261 and PP5v_S3 now i have 439v on diode mode! Compare with a working board it's same value! but the board not turnin on and no green light!! i will check all trails for shorts!! =(
 
N

Noguinfor

New member
All rails checked and not found any short's! As I was analyzing it was comparing with a working board and the values are similar (Diode mode)!

Already replace U7000, by discharge same result's! With fake charge i have green light 1-2 sec goes orange and then goes green but don't turn on.

already replace U2600, by discharge to same results. SYSCLK_CLK32K_RTC = 32khz !

i have P5VS3_EN_L = 3.2V but Still missing PP5V_S3 = 0V. When i plug and unplug the charger i have this https://drive.google.com/file/d/1GwNbkgMwoZEEibQfBGgRF11jPQn_8Vm_/view?usp=sharing

this one I would like to repair because it is from a new client and I think it's worth it because the board is clean. Does not look bad or touch from another guy!

thanks
 
2informaticos

2informaticos

Administrator
Staff member
"i have P5VS3_EN_L = 3.2V"
In fact 5V_S3 is not enabled!
That "_L" means something; active low, you need 0V there...

Post voltages for U7941.
 
N

Noguinfor

New member
U7941

1 - pp3v42_g3h_pwrctl - 3.42v
2 - smc_pm_g2_en - 3.4v
3 -p5v3v3_reg_en - 3.2v
4 - p3v3s5_en_l - 0v
5 - gnd
6 - pp3v3_s5_pwrctl - 3.3v
7 - s5pgood_dly - 0v
8 - s5_pwrgd - 3.4v
 
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