820-3115 green light, no fan/no power

iClub

Member
Hey info, this mac suffered oxidation in the region of the u2600 and SMC, I replaced the oxidized components, but the fan does not rotate.
I replaced the u2600, SMC, u7400 and y2605.
Voltage:
PPbus 12.59
PP3v3_42 3.5V
PPVRTC_G3H 3.31V
ALL_Sys 0V, no pulse.
PLT_rstv 0V, no pulse
PP3v3_sus 3.31V
PP3v3_s0 3.31`V
PP5v_s0 5.088V
SMC_BATLOW_L 3.29V
PM_SUS_EN 3.31V
PM_SLP_SUS_L 3.31V
PP3V3_S5 3.31V
PCH_INTVRMEN_L 3.073V
RTC_RESET_L 3.31V
SMC_ADAPTER_EN 3.46V

R7403/2 182K / 152K
 

2informaticos

Administrator
Staff member
And you get CPU core voltage???
You are the first interested to post information here.
Check if any coil misses voltage.
 

iClub

Member
diode: L7760 0.170V

I removed the U2600 and U7760, but it still shows this 0.170V diode-scale value.
 

2informaticos

Administrator
Staff member
Why don't use schematic notations???
Why should we open the boardview?
All our help is based on schematics...
 

iClub

Member
P1V8S0_EN 3.2V
P1V8S0_SW 0.541V
P1V8S0_PGOOD 0V
P1V8SO_FB 0.182V
P1V8S0_SS 0.341V
P1V8S0_COMP 3.2V


diode mode
P1V8S0_EN 0.615V
P1V8S0_SW 0.172V
P1V8S0_PGOOD 0.425V
P1V8SO_FB 0.685V
P1V8S0_SS 0.615V
P1V8S0_COMP 0.691V

that way ?
 

iClub

Member
is the same defect. I checked L7760 that the resistance is 265 Ohms, compared to another board, this value is very low.
 
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