A1466 820-00165-A no keybord nor trackpad

[hgoncalves]

Hi,

I have an A1466 820-00165-A that doesn't recognize the keybord nither the trackpad.

I already tried with USB disk, with new trackpad and new cable and new keyboard, but same result.

Diode reading on J4800 seams ok, besides pin 8 (TPAD_WAKE_L) that has 0.002. Not sure if it is a normal reading.

Can you help?

 

[2informaticos]

As per schematic 2 versions exist, TPAD_INTWAKE : SPLIT/SHARED.
If R4844 is soldered (SHARED), short to ground is normal.

KB/TP work before loading macOS (boot menu)?

 

[hgoncalves]

Hi,

The KB/TP doesn't work at all, even before OS boots

 

[2informaticos]

Any history available?
Inspect U4810 and post voltage for its pins 3 & 7 in boot menu and macOS too.

 

[hgoncalves]

HI,

U4810 looks OK.

I can't login to macos, because keyboard doesn't work. However when powering on the macbook, with only the board on the bench I get these voltages:

Before login menu
Pin 3= 0V
Pin 7= 2.485V

After login menu:
Pin 3=2.485V
Pin 7=0V

With KB conected on the board I get those values:

Before login menu
Pin 3= 0V
Pin 7= 0V

After login menu:
Pin 3=2.485V
Pin 7=0V

 

[2informaticos]

"with only the board on the bench"
Why would we need irrelevant measurments?
Please, measure with TP connected.

 

[hgoncalves]

With TP/KB conected on the board I get those values:

Before login menu
Pin 3= 0V
Pin 7= 2,030V

After login menu:
Pin 3=2,034V
Pin 7=0V

 

[2informaticos]

If File Vault is not enabled, login menu is same as macOS loaded.
So be aware, put the machine in boot menu with USB KB first.

BTW, you must get opposite voltage on pins 3 & 7.
Is better to post all U4810 voltages, in both cases.

2V on any output is not normal.
Be sure pin 8 gets 3.3V.
You can try changing U4810, just in case.

 

[hgoncalves]

File vault is disabled.

U4810 voltages:

BOOT MENU:
1=2.881V
2=3.268V
3=0.002V
4=0V
5=2.879V
6=0.003V
7=2.035V
8=2.034V

With TP/KB connected I only get 2.0V on PP3V3_S4, and w/o the TP/KB I get 2.4V on PP3V3_S4, but I'm sure that a few hours ago I had 3.3V on PP3V3_S4

I don't understand those readings (tried with 2 multimeters), because I think that the mac shouldn't power on without PP3V3_S4, but It boots

MACOS:
1=2.881V
2=0V
3=2.0V
4=0V
5=2.879V
6=3.297V
7=0V
8=2.036V

 

[2informaticos]

U4810 seems to work, but you must fix 3V3_S4 problem.
It is bad even without TP connected; should be 3.3V, not 2.4V, nor 2V as you've posted on U4810.
Test changing U8000.

 

[hgoncalves]

HI,

After replacing the U8000 the TP/KB started to work again. It was that.

TKS!