820-00165-02 Not Turning On

[MarcinRdm]

This board has:

PPVRTC_G3H 3,43
SMC_PM_G2_EN 0
PP5V_S0 0
PM_BATLOW_L 0v
SMC_RESET_L. 2.2 to 3.4V
SMC_ADAPTER_EN 0v
SMC_PM_G2_EN. 0v
PPBUS_G3H 8.56v
PPVRTC_G3H 3,43
PP5V_S5 0

U7100
1- 0
2 - 16.12
3 - 4.32
9 - 1.4
12 - 3.43
13 - 3.4
14 - 3.4
15 - 0.06
17 - 8.17
19 - 5.05
20 - 5, 05
27 - 16
I don't know what to check anymore.

 

[2informaticos]

Inspect U5110 for corrosion.
Post all its voltages.

"9 - 1.4"
Check R7121/22 and their traces.

 

[MarcinRdm]

U5110
1 - 3.42v
2 - 0 v
3 - 3.42
4 - 3.17
5 - 3.4
6 - 3.4
7 - 3.43
8 - 3.3

R7121/22 10.5 ohm

 

[2informaticos]

"SMC_RESET_L. 2.2 to 3.4V
--------------------------
5 - 3.4"
???

Post exact ohm resistance between pins 27/28 of U7100.

 

[MarcinRdm]

My mistake: SMC_RESET_L. 3.4V
resistance between pins 27/28 : 20.4 ohm

 

[2informaticos]

Check again pin 9 of U7100.
There should be less than 0.5V...

 

[MarcinRdm]

Now is 0,031v
R5431 45.3 kohm

 

[2informaticos]

So now you have steady SMC_RESET_L?
Check exact PPBUS_G3H voltage again.

 

[MarcinRdm]

SMC_RESET_L steady 3.4v
now PPBUS_G3H 0.7v and falls

 

[ppvout.s0]

I have the same thing and PP3V42_G3H it drops to 2.6v and then goes back to 3.4. Is this normal?

 

[2informaticos]

Please open new thread with your problem.
Same symptom doesn't always mean the same problem!

Post resistance between pins 17/18 too.

Remove F7140 and check C7140 voltage.
If still the same, check/replace C7125.
Also replace U7100 and Q7130.
Be sure to have good solders and traces.

 

[MarcinRdm]

Without F7140 to the same.
I checked C7125 and it's ok. diode-mode pin 1 - 0.550, pin 2 - 0.120.
I replaced U7100 and Q7130 still the same

 

[2informaticos]

"Post resistance between pins 17/18 too."
?

Check all U7100 surrounding components and traces; especially for pins 5, 7, 8.

"I checked C7125 and it's ok. diode-mode pin 1 - 0.550, pin 2 - 0.120"
I mentioned replace option, just in case you don't know how to check it; which seems to be the case...

 

[MarcinRdm]

I replaced C7125 - still the same
17/18 3.7 ohm
I compared the U7701 with a working machine. I found a broken R7105 and changed. Nothing helped.

 

[2informaticos]

Post again some basic voltages (F7140 in place):
PPBUS_G3H, SMC_RESET_L, PM_BATLOW_L, SMC_PM_G2_EN, SMC_ADAPTER_EN.

 

[MarcinRdm]

PPBUS_G3H 0,75v and falls (F7140 pin.2)
PPVBAT_G3H_CHGR_REG and falls (F7140 pin.1)
SMC_RESET_L 3.4v (R7100)
PM_BATLOW_L 0v (R1410)
SMC_PM_G2_EN 0v (R5198)
SMC_ADAPTER_EN 0v (R5185)

 

[2informaticos]

If you don't get voltage at C7140, when F7140 is removed, then your problem is on U7100 area.
Post again U7100 voltages (F7140 removed).

 

[MarcinRdm]

I measured with f7140.
Without F7140: C7140 pin.1 0,75v and falls.
Will soon publish the U7100 without F7140

 

[MarcinRdm]

U7100 without F7140:
1- 14.9v
2 - 15.95v
3 - 0v
9 - 0.3v
12 - 3.4v
13 - 3.4v
14 - 0v
15 - 0.46v
17 - 0v
19 - 5.05v
20 - 5.08
27 - 0

 

[2informaticos]

"3 - 0v"
ACIN misssing.
Check diode mode to ground first.
If short/low, remove C7111 and check again.
Be sure R7110 is good.
If still low, change U7100.