820- 4924-a no power, orange light

iClub

Member
hi buddy, this mac has no oxidation, just dust.

Voltage:
PPbus_g3h 12.60V; pp3v42_g3h 3.42V; ALL_SYS_PWRGD 0V pulses 1.52V when triggering SMC_ONOFF_L quickly; PM_SLP_Sx_L pulses to 1.78V when triggering SMC_ONOFF_L.
PM_RSMRST_L 3.24V; PM_PWRBTN_L 3.41V; PCH_DSWVRMEN3.21V;PM_DSW_PWRGD.3.42V.
 
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iClub

Member
L7520 0v
L7430 0V
L7560 3.35V
L7710 0v
L3095 0v
L7130 12.83 / 12.60V
L7320 0V
L7310 0V
L7630 0V

PP3V3_S0 0v, there is pulse 1.63V. I have PP3V3_SUS 3.34V, should I also have PP3V_S0 voltage ?
detail that I forgot to say U7501 had oxidation on pins 10 and 9, replace the component by precaution.
 
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2informaticos

Administrator
Staff member
Is strange you mentioned pulse on 3V3_S0, but nothing on L7520.
Are you sure, or didn't even check L7520 for pulse???
What do you expect to get without 5V on the board?

Try to find a logic in the repair proces.
How can you go for S0 voltages, when no S4/3 present???
 

2informaticos

Administrator
Staff member
Then you should have pulse on more coils.
Why don't you post accurate information???
You've mentioned a pulse on 3V3_S0, but you do not want to tell us nothing about other power rails.
Do I need to ask you every time for one voltage in particular?

Pins 5/6 of U1950 pulsing?
 

2informaticos

Administrator
Staff member
"6 - 3.31V"
Pulse, or steady voltage???
Try to understand, you are the first interested to post as more as possible and accurate information.
 

iClub

Member
does not accept SMC Bypass, the led erases from the magSafe when you try this method. Could it be an SMC defect ?

Read a post that you indicate to do the Reball SMC, asking to test certain voltages before, PCH_INTRUDER_L and PCH_INTVRMEN. In my case the tensions are the same of this member.
Missing 2 (two) RTC signals, PCH_INTRUDER_L and PCH_INTVRMEN.
If good, then reball SMC.
.
 

2informaticos

Administrator
Staff member
Something strange with your measurments; maybe SMC problem.
Pin 6 must rise after pin 5; I talk about U1950 pins.
Change SMC and try again.
 

iClub

Member
I don't want to rush, is there any more tension that I can measure to make sure that a SMC Reballing is needed?
 

iClub

Member
Yes, several times, it does not accept the deviation of the SMC. Detail when using this mode, the MagSafe light goes out.
 

2informaticos

Administrator
Staff member
So Magsafe remains off, untill disconnect/reconnect charger?
What happen with SMC_RESET_L signal?
3V42_G3H and PPBUS_G3H have both correct voltage in that time?
 
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