820-00928-A spillage of liquid No power no charge

[tipoti]

are you kidding me ??? my problem is not answering my questions

" The value of R3033/34 appears as 100k and no stuff in the diagram, but there are these parts on the motherboard and when I measure it, the values are 0 ohms. When I remove the R3033/34 and measure its 1st pin with ground, there is no short circuit. 0.504 shows up in diode mode. Is the value of these resistors really 0 or should it be 100k as written in the diagram? "

" r3033 is in place and shows short circuit. the diagram shows the value as 100k. I did not understand this situation. Is it normal for it to be short circuited or should I replace it with another 100k resistor? "

 

[2informaticos]

You don't really read entire posts???

 

[tipoti]

" The value of R3033/34 appears as 100k and no stuff in the diagram, but there are these parts on the motherboard and when I measure it, the values are 0 ohms. When I remove the R3033/34 and measure its 1st pin with ground, there is no short circuit. 0.504 shows up in diode mode. Is the value of these resistors really 0 or should it be 100k as written in the diagram? "

" r3033 is in place and shows short circuit. the diagram shows the value as 100k. I did not understand this situation. Is it normal for it to be short circuited or should I replace it with another 100k resistor? "

 

[tipoti]

What should the R3033/34 values be?

 

[2informaticos]

I can't believe this .

""I guess you didn't read what I wrote."
Yeah, I do NOT see any mention about R3034 in your previous post!
Did YOU read what you've wrote?

I don't have 00928 board on hand now.
But I can confirm with 00281; the same resistors are used for the same signals.
R3033 is soldered and has 0 ohm; also R3034.

BTW, R3035/36 can't be present in this case."

Wrote almost 45 minutes ago...

 

[tipoti]

I found the cause of the confusion. When I read it, there was no text at the bottom, only the top, I guess, then you edited it. Since I did not refresh the page again, I only read the text at the top. the confusion was

When I wrote this, "it says r3033 is not in place. But r3033 is in place and shows short circuit" in the first reply to me "Compare R3033/34 and their lines to ground in diode mode." why ?
"R3033 is soldered and has 0 ohms; also R3034." You said you were, why didn't you say that in your first reply?

I ordered CD3215A. We'll continue when it comes

 

[2informaticos]

My first reply was in half indeed.
Because your previous reply was realy strange for me: "I guess you didn't read what I wrote."
I make errors myself too, but I try to check first when someone points that.

I completed the post 2-3 minutes later, after I found the 00281 scrap board for checking...

 

[tipoti]

I mostly use translate, sorry if there is a wrong translation

 

[tipoti]

I changed the CD3215A, the result is the same, it draws 0.01A amps, does not charge and does not turn on

 

[2informaticos]

That means you still have problems in UB300/400 area.
Inspect the terminals of USB-C connector.
Compare diode mode to ground readings on different points between left/right ports.
Be sure UB090 has good solders/traces and surrounding resistors OK.

Do you get PPBUS_G3H voltage when connect the battery?
Try with known good battery.
All USB-C ports still remain on 5V then?

 

[tipoti]

does this device work without batteries?

 

[2informaticos]

It should get PPBUS_G3H at least, without battery.
Testing with battery in this case may help to see if there is other problem, apart of USB-C area.

 

[tipoti]

F7000= PPBUS_G3H =no voltage

no voltage with or without battery

I read 5 volts on FB201, shouldn't it be 20 volts here?

 

[2informaticos]

FB200/1 will get 20V only after correct communication between SMC and charger.

No voltage on PPBUS_G3H means there is other problem, apart of USB-C area.
I supposed the battery data cable was also connected and battery still holds some charge.

 

[tipoti]

So what will I check? What should I check for PPBUS_G3H voltage?

What should I check between SMC and charger

 

[2informaticos]

Seems that your board suffered more damage than expected; because of liquid spill.
You still have problems on UB300/400 area, but also somewhere else.
Possibly SMC got bad, if you don't get PPBUS_G3H at all; nor even with battery connected.

 

[tipoti]

I understand that the absence of PPBUS_G3H has nothing to do with CBs. you say PPBUS_G3H should be output anyway, but is this a definite SMC problem?
in a similar problem, smc and 4xCB were changed, the problem was not resolved

820-00928 5v looping one side only

Hello, I'll give a quick description of the original damage and what I've done till now and then provide some measurements. I've attached photos with the initial damage and after removing the short on the trackpad connector. Initially, PPVIN_S4_TPAD_FUSE was shorted and the short was removed by...

boards.rossmanngroup.com

 

[2informaticos]

Changing the chips can't assure the board repair.
Broken traces, bad solders, corroded passive components (caps, resistors, coils), can block the correct communication.
Also accumulated crap under BGA chips can cause leakage between balls.

 

[tipoti]

There was corrosion in the u2890 area. And the r2890 was not in place. I had cleaned that area before and replaced the r2890. Could the R2890 be broken?

 

[2informaticos]

Replace corroded resistors, check traces and solders; for U2890 and also UB090.
You can compare diode mode readings between both chips.