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820-00165-a no power

L

lincev

Member
hi all, I have this board but no power:

no led green or orange
no power bypass mode
no fan spin

I could find some corrosion on the U5110, I removed the IC and saw that pin 1 did not exist, I replaced the IC and put a cable to have the line

pp3v42 - 3.39v
ppbus - 8.10v
pp3v3_s0 - 0,08v
pp3v3_s5 - 0v

thanks for all
 
L

lincev

Member
J6100 is perfect !

Sorry but ic5100 seemed not to be correct and I have re-soldered it now I have an orange light and the fan spins for a few seconds when I connect the charger

new values

U5110
1 PP3V42_G3H= 3,39v
3 PP3V42_G3H_SMC_SPVSR=3,37v
4 SMC_MANUAL_RST_L=0v
5 SMC_RESET_L=3,3v
6 SMC_LSOC_RST_L=3,35v
7 SMC_ONOFF_L=3,39v
8 PP3V3_S5_AVREF_SMC= 1,5v 2,0v 2,8v all time change... crazy
 
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L

lincev

Member
hi, no, I only connect the charger, Orange LED pulse power changes to green LED, moves fan and stops again and orange LED.

It seems like symptoms as if pressing the power button performs an SMC reset?
 
L

lincev

Member
Disconnecting any power, hold the power button and connect magsafe together I maintain 5-10 seconds? Same result

I also tried without connecting the I/O board flex data and connect only flex power (J7000), which once worked for me with other boards.
 
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L

lincev

Member
thanks for your reply

I have checked the area and it is clean

The C5125 is not shorted, the values in diode mode are 800 in one direction and 1600 in the opposite direction.
 
L

lincev

Member
If I was checking the same thing, it was replaced but I think it repairs the PP3V42_G3H line well or maybe it is not soldered correctly.

thanks so much
 
L

lincev

Member
hi again, U5110 has been replaced, now works in smc bypass mode

normal mode green led, orange led, fan turns on and stops, don't work
 
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