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[SOLVED]820-00165-A no trackpad and keyboard

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M

MaxFix

Member
Hi to everyone!

I have a problem with water damaged 820-00165-a board. The Keyboard and the trackpad stop to work as soon as it boots into OS but it is working in OS installation menu and i already installed a clean OS. Some corrosion destroy the pin 5 of U5601, and posible also destroy something else in that sector.

I took some measurements on U5601 and is showing
Pin N°1 is 0,167v
N°2 GrD.
N°3 0,168v
N°4 0,004v and
N°5 0,022v

Also C5603 is showing 3,32v.

I took a picture please check it.

Please advise how to proceed.

Thanks.
 

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M

MaxFix

Member
dukefawks said:
Tried a known good trackpad+cable? Explain to me what U5601 would have to do with the trackpad.
Click to expand...

I already tryed with new trackpad new keyboard and also new flex trackpad cable. And the issue is still the same.

I dont really know if those components have some relation with the trackpad or the keyboard. But that components on the motherboard doesnt look good
 
M

MaxFix

Member
Yes, that is what i did. i connected the flex cable without the track-pad and i tested all the pins are getting contact from the motherboard to the end of the flex cable.

Some others ideas ?
 
S

SMMRepair

Member
You did not report diode mode measurements for trackpad connector with trackpad disconnected, like duke asked. You need to be very diligent in answering all questions asked of you if you're sincere about wanting to repair these boards.

Also, don't use the comment feature like you did on duke's post...he doesn't receive any notification or indication that you replied. You need to submit a new reply like you did immediately above this post.
 
M

MaxFix

Member
Hi! first of all my apologies about my stupid tested, i was understanding different thinks, whatever continuing with the test:


Trackpad connector (J4800)

This is what the multi meter shows me:

First test was with the BLACK tip in GRD
PINS:
1: 0
2: 0
3: beep
4: 0
5: 0
6: beep
7: 0,072
8: beep
9: 0,076
10: 0
11: 0
12: 0
13: 0
14: 0
15: 0,010
16: 0
17: 0
18: 0
19: 0
20: 0

Second Test with the RED tip in GRD
PINS:
1: beep
2: 0,496
3: beep
4: 0,364
5: 0,364
6: beep
7: 0,072
8: beep
9: 0,068
10: beep
11: beep
12: beep
13: 0,431
14: beep
15: 0,010
16: 0,956
17: 0,966
18: 0,620
19: beep
20: 0,495
 
D

dukefawks

Administrator
Please look at your measurements and the schematic and tell me why this all makes no sense. Did you measure with power applied......yes you did.
 
M

MaxFix

Member
Sorry dont kill me im learning.

This are the measures again, without DC.

With the Black tip on GRD:

1:1,707
2:0,986
3:Beep
4:0,536
5:0,535
6:Beep
7:0,995
8:Beep
9:0,998
10:0,918
11:OL
12:OL
13:OL
14:OL (this one first shows me 1,6xx and star go up intill shows OL)
15:OL
16:1,309
17:1,305
18:1,960
19:1,363
20:1,985

With the Red tip on GRD:

1:0,486
2:0,506
3:Beep
4:0,432
5:0,432
6:Beep
7:0,518
8:Beep
9:0,526
10:0,371
11:0,752
12:0,675
13:0,504
14:0,434
15:0,677
16:0,703
17:0,703
18:0,633
19:0,324
20:0,625
 
D

dukefawks

Administrator
That looks ok so far. Power on system in boot menu and measure pin 10, 12, 14. Then boot into OSX and measure it again. Voltage of course.
 
M

MaxFix

Member
I think we have something strange here, check this out:

Whit the track pad connected to the motherboard.

(in OS)
Pin
10: 3,32v
12: its going up and down between 2,3v and 3,8v and never stop.
14: 5,10v

(in boot menu)
Pin
10: 3,31v
12: 0v
14: 5,10v
 
M

MaxFix

Member
So this are me measurement:

With trackpad connected

U4810:
Pin
2: 0,002v
6: This one also goes up and down between 2,2v to 3,5v and never stop.

Sorry but i didn't get what you means with enable/disable. You means disable usb ports in the system with commands?
 
D

dukefawks

Administrator
The trackpad has 2 modes. It works in USB mode in the boot menu and in OSX is switches to SPI.
Measure all pins for voltage at the trackpad side when booted in OSX. This is starting to look like a fucked SPI bus, which goes directly to CPU :(
 
M

MaxFix

Member
Maybe yes, this motherboard had some sectors with corrosion before the ultrasonic clean up.


So this are the measures at the track pad side:
Pin
1: 3,4v
2: 3,4v
3: 3,4v
4: 3,2v
5: 3,3v
6: 0v
7: 5,1v
8: this one also its going up and down from 2,2v to 3,2v
9: this one also is doing same as pin number 8
10: 3,2v
11: 3,2v
12: 0v
13: 0,01v
14: 0,01v
15: 0,01v
16: 0v
17: 0v
18: 0v
19: 0v
20: 3,4v
 
M

MaxFix

Member
TPAD_SPI_INT_L

With the track pad connected it's showing different voltage from 2.2v to 3.6v

Just in the case that the the track pad are not conected to the motherboard the voltage is stable
 
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