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Versão atual de: Rany ,

Texto:

First of all, well done getting so far!
Second of all, VERY IMPORTANT - proper use of a multimeter: you are testing in continuity mode while your laptop is connected to a power source such as battery or charger or both. This is why you are hearing a beep however you touch the board.
NEVER EVER test for continuity and resistance when the board is connected to a power source.
ONLY test voltages when your board is connected to a power source (and avoid at all cost shorting components together when testing voltages, thus creating additional issues and adding variables).
ALWAYS test resistance and continuity when the board is disconnected from ALL sources of power.
You probably or may be have fried your multimeter already.
Now regarding your board: properly test resistance between pins (17 and 18) and then between (27 and 28). What are the values you are getting - in Ohms?
Why? Because pressing and holding the power button bypasses SMC over-current detection between AMON and BMON if I remember correctly. Specially that you mentioned corrosion, which means those lines are probably damaged.
Otherwise like @reece said you have to use a known good keyboard and trackpad, making sure the trackpad itself of the flat cable are not corroded. But you can start by ruling out issues around the ISL.
-EDIT: got the board and indeed the jumper was badly made and the repair attempt caused some pins of the ISL to short together.
-After replacing the ISL, all the corroded components, and the LCD connector, this is what we got:
+EDIT: @renegade_r got the board and indeed the jumper was badly made and the repair attempt caused some pins of the ISL to short together. It shows in the picture you posted.
+
+So we replaced the ISL, all the corroded components, and the LCD connector, and this is how it went:
+
Upon arrival:
+
[image|1119593]
+
Before and after removing the ISL and neighboring components:
-[image|1119609][image|1119704]
+
+[image|1119609]
+
+[image|1119704]
+
The LCD connector was heavily corroded and took some serious effort to clean:
-[image|1119597][image|1119580][image|1119579][image|1119612]
+
+[image|1119597]
+
+[image|1119580]
+
+[image|1119579]
+
+[image|1119612]
+
Other components all over the board were corroded:
-[image|1119696][image|1119667]
+
+[image|1119696]
+
+[image|1119667]
+
People shrug when I mention pro ultrasonic cleaning. Here's an example of the difference it makes, and imagine that this same scrubbing happens even '''''underneath''''' the chips:
-[image|1119672][image|1119702]
+
+[image|1119672]
+
+[image|1119702]
+
And the final result:
+
[image|1119645]

Status:

open

Editado por: Rany ,

Texto:

First of all, well done getting so far!
Second of all, VERY IMPORTANT - proper use of a multimeter: you are testing in continuity mode while your laptop is connected to a power source such as battery or charger or both. This is why you are hearing a beep however you touch the board.
NEVER EVER test for continuity and resistance when the board is connected to a power source.
ONLY test voltages when your board is connected to a power source (and avoid at all cost shorting components together when testing voltages, thus creating additional issues and adding variables).
ALWAYS test resistance and continuity when the board is disconnected from ALL sources of power.
You probably or may be have fried your multimeter already.
Now regarding your board: properly test resistance between pins (17 and 18) and then between (27 and 28). What are the values you are getting - in Ohms?
Why? Because pressing and holding the power button bypasses SMC over-current detection between AMON and BMON if I remember correctly. Specially that you mentioned corrosion, which means those lines are probably damaged.
Otherwise like @reece said you have to use a known good keyboard and trackpad, making sure the trackpad itself of the flat cable are not corroded. But you can start by ruling out issues around the ISL.
+
+EDIT: got the board and indeed the jumper was badly made and the repair attempt caused some pins of the ISL to short together.
+After replacing the ISL, all the corroded components, and the LCD connector, this is what we got:
+Upon arrival:
+[image|1119593]
+Before and after removing the ISL and neighboring components:
+[image|1119609][image|1119704]
+The LCD connector was heavily corroded and took some serious effort to clean:
+[image|1119597][image|1119580][image|1119579][image|1119612]
+Other components all over the board were corroded:
+[image|1119696][image|1119667]
+People shrug when I mention pro ultrasonic cleaning. Here's an example of the difference it makes, and imagine that this same scrubbing happens even '''''underneath''''' the chips:
+[image|1119672][image|1119702]
+And the final result:
+[image|1119645]

Status:

open

Editado por: Rany ,

Texto:

First of all, well done getting so far!
Second of all, VERY IMPORTANT - proper use of a multimeter: you are testing in continuity mode while your laptop is connected to a power source such as battery or charger or both. This is why you are hearing a beep however you touch the board.
NEVER EVER test for continuity and resistance when the board is connected to a power source.
ONLY test voltages when your board is connected to a power source (and avoid at all cost shorting components together when testing voltages, thus creating additional issues and adding variables).
ALWAYS test resistance and continuity when the board is disconnected from ALL sources of power.
You probably or may be have fried your multimeter already.
Now regarding your board: properly test resistance between pins (17 and 18) and then between (27 and 28). What are the values you are getting - in Ohms?
-Why? Because pressing and holding the power button bypasses SMC over-current detection between AMON and BMON if I remember correctly. Specially that you mentioned corrosion, which means those lines are properly damaged.
+Why? Because pressing and holding the power button bypasses SMC over-current detection between AMON and BMON if I remember correctly. Specially that you mentioned corrosion, which means those lines are probably damaged.
Otherwise like @reece said you have to use a known good keyboard and trackpad, making sure the trackpad itself of the flat cable are not corroded. But you can start by ruling out issues around the ISL.

Status:

open

Mensagem original de: Rany ,

Texto:

First of all, well done getting so far!

Second of all, VERY IMPORTANT - proper use of a multimeter: you are testing in continuity mode while your laptop is connected to a power source such as battery or charger or both. This is why you are hearing a beep however you touch the board.

NEVER EVER test for continuity and resistance when the board is connected to a power source.

ONLY test voltages when your board is connected to a power source (and avoid at all cost shorting components together when testing voltages, thus creating additional issues and adding variables).

ALWAYS test resistance and continuity when the board is disconnected from ALL sources of power.

You probably or may be have fried your multimeter already.

Now regarding your board: properly test resistance between pins (17 and 18) and then between (27 and 28). What are the values you are getting - in Ohms?

Why? Because pressing and holding the power button bypasses SMC over-current detection between AMON and BMON if I remember correctly. Specially that you mentioned corrosion, which means those lines are properly damaged.

Otherwise like @reece said you have to use a known good keyboard and trackpad, making sure the trackpad itself of the flat cable are not corroded. But you can start by ruling out issues around the ISL.

Status:

open