820-00281 Won't turn on

[2informaticos]

Do you get correct PP3V3_G3H and SMC_RESET_L?
Allow 6-7s when you check voltage and signals.
Try to catch them just before the input voltage drop...

 

[punkieftw]

Do you get correct PP3V3_G3H and SMC_RESET_L?

Yes, i get 3.3v but i said before, this voltage and signal gets down every 5-4 secs.

 

[2informaticos]

4-5 minutes?
Ooops, I was thinking about 4-5s.
In this case, looks more like USB-C controllers problem.

 

[punkieftw]

4-5 minutes?

I'm sorry, i mean seconds.

So, what i can do?

 

[JohnB8812]

Inject 3.3 volts in to PP3v3_G3H and monitor for current draw. If there is any draw, see if one fo the CD3215 chips is pulling the signal low. If there is no current draw, do a diode mode reading around each CD3215 on 3v3_G3H, and the 3v3, 1v8, and 1v1 LDO lines.

 

[punkieftw]

Hi again,

I inject 3.3 volts on pin 2 of R6923 and nothing is getting hot and nothing happening on the power supply. all the time have 0.01 amps and 3.3v stable.

what do you think?

No one have an idea?

 

[JohnB8812]

If no current draw, then this will be hard to figure out what is pulling your DC in line down. One of the CD3215s is likely the issue, but it's hard to figure out which one. Take diode mode readings as previously stated around each chip.

 

[2informaticos]

When F7000/01 removed, do you get steady input 5V?
If not, test removing R7020 too.

 

[punkieftw]

Why do you think the problem is actually one of those CD3215? maybe the problem are in another place.

 

[2informaticos]

I asked you to do few test, to locate the problem.
I suppose that SMC tries to start the board and detects something wrong and gets blocked...
CD3215 issue (usually) should stuck in steady 5V at R7020, or even no voltage passing through their input MOSFETs.

 

[punkieftw]

When F7000/01 removed, do you get steady input 5V?

Nop, never get 5v steady. always gets down.

If not, test removing R7020 too.

If remove R7020, have 5v steady but, no 0,000 amps.

 

[2informaticos]

Seems that your problem is on U7000 area; maybe the chip itself.
Change ISL9239, no firmware required.
Check first no short through Q7030/40.

 

[punkieftw]

Seems that your problem is on U7000 area; maybe the chip itself.

The area is pretty clean.

Change ISL9239, no firmware required.

OMG, some chip needs a new firmware? Yisus, haha! ok, i will buy ISL9239 and let you know.

Check first no short through Q7030/40.

No short checked.