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820-00923 19.63V Not Turning ON

2click

2click

Member
Hi, I have this computer which was working fine after I replaced a blown component R7609, it worked fine for a few days (I left it on and working for around 4 days), but when I left it off for 2 days and it doesn´t turn on again. When I connect the charger to a USB C with the USB C tester it goes directly to 19.63v, las time I was checking around U7650 and PM_SLP_S5_L was low at .280mv. I replaced U7650 and it turned on again, but left it off for a day and now it is the same 19.63v and not turning on... need help on this one to make some sense out of it! I just don´t understand why when I leave it off for a day it just dies. Thanks for the help!
 
2click

2click

Member
Diode mode L7600 = .423
I changed C7609 and now when I connect the charger, it starts at 5v and then jumps to 19.63v but still no sign of it trying to turn on as I get 0 Amp of consumption.
** I used a 0.1 uf 16v, instead of the 0.1uf 25v, because I couldn´t find any exact match on the donor boards I have. Is that ok? **
 
2informaticos

2informaticos

Administrator
Staff member
16V is good enough; the boost voltage is 10V aprox.

Does the board try to start pressing power button?
Which voltages do you get on the board?
Check power on sequence.
 
2click

2click

Member
Missing PP5V_S4, but the enable signal is not present... which comes from PM_SLP_S5_L which has a value of 0.183v
 
2click

2click

Member
Sorry, the thing is the computer is now working, I replaced C7609 and is turning on now, it worked fine for 2 days, I turned on today and it is doing a weird thing:
when I connect the usb c charger, it goes directly to 19.6v, the amperage shows the following consumption aproximately: it starts around .500 A goes to a peak of 2.1A, then goes to 0. When consumption goes to 0 for a couple seconds I get .029 A consumption and the voltage comes down to 5v at .029 A, it makes the transition to 19.6v and around .600 A and shows the apple and starts, but when I try to get into the test user, it is slow as hell!! Any idea over this?

The voltage sequence that happens can happen 2 times before it starts, is that normal?
Right now it seems to be stuck at the user loading bar with 19.34v and from .490 to .510 A
 
2click

2click

Member
This is driving me crazy!, I disconnected the battery to see if it had something to do it turned on fine, but a few minutes and it restarted and froze loading the user again. This morning I connected the usb c to one of the ports, it went from 5v to 19.4v but 0 A. I changed to another port and got 5v, transition to 19v and .700A and it turned on... wtf? I dont feel like returning it to the customer like this even tough that it came off. Any clues on what to check?

I didn´t try safe mode, but today it loaded fine, nor the USB Macos boot.

update: I put it to sleep by closing the lid and this morning, when I connected it to usb c, it was 19.6v and .029A, pressed the ON button and the fans whent to full speed inmediatly (consumption is still the same .029A and the battery is connected), it is turning on, but I don´t think is ready to get back to the owner, any help on this on what to check?

I disconnected the battery, and connected the usb c and it is only getting 5v and 0A it is not making the transition to 19v
 
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