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820-3209 Turn On Problem After Liquid Spilled

M

MeTech Turkey

Member
Hello, my customer brught me a Macbook A1466 which has a board number 820-3209.

I have changed the all parts which had corrosion. And we have bought a new I/O board for the device. When we put the board into the case and connect everything we saw that the fan starts for a second then goes off and device too.

Then we took the board out from the case and put the charger on again under the thermal camera, and found out that Q7080 is flashing under the thermal.

Thought that it might be charger problem and tried another one but the problem is still same.

Any ideas about what it could be ?
 
2informaticos

2informaticos

Administrator
Staff member
You didn't mentione any board voltage, or signal.
No idea if you get Magsafe light at least.

To discard Q7080 leakage, test the board using lab PSU, or fake charger.
 
M

MeTech Turkey

Member
First of all sorry for the empty post.

I get orange magsafe light on for a while then in 3 or 4 seconds it goes slowly down. I found out that on Q7630 I can read the 8.4V on 1st and 2nd leg. But on other legs the voltage jumps from 0.00 to different voltages on each leg.

I dont know where else I need to start to look at it to be honest.
 
2informaticos

2informaticos

Administrator
Staff member
No idea how did you arrive to Q7630.

What about 3V42_G3H and PPBUS_G3H voltage at F7040 (without battery connected)?
Check when Magsafe light disappears too.
 
M

MeTech Turkey

Member
As Im always saying that Im a learner. I have found out that I forgot the put the flex cable from I/O board to mainboard. Now the magsafe lights are on always and it is orange.

PPBUS_G3H = 8.39V
3V42_G3H = 3.43V
 
2informaticos

2informaticos

Administrator
Staff member
Post 3V3_S5/SUS, PM_BATLOW_L, SMC_PM_G2_EN, SMC_ADAPTER_EN, PM_DSW_PWRGD, PCH_DSWVRMEN and the 4 PCH's RTC (DC) signals.
If all present, trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L, at same time.
 
M

MeTech Turkey

Member
I couldn't find the 3V3_S5/SUS line and is 4PCH's RTC signals are from:

PPVRTC_G3H, PPVOUT_G3_PCH_DCPRTC, RTC_RESET_L, PCH_SRTCRST_L these ones you want me to check signals as 4 PCH's RTC?

PM_BATLOW_L = 3.33V
SMC_PM_G2_EN = 3.43V
SMC_ADAPTER_EN = 3.4V
PM_DSW_PWRGD = 3.43V
PCH_DSWVRMEN = 3.32V

And normally I have 3.4V steady on PM_PWRBTN_L but when we trigger SMC_ONOFF_L it goes down to 0.35V and stays there. When we leave it it goes back to 3.4V again.
 
2informaticos

2informaticos

Administrator
Staff member
"I couldn't find the 3V3_S5/SUS line"
Of course, there is no LINE; I mentioned two LINES.
We use such notation since years here; guess what means, please.

If you detected the drop pulse on PM_PWRBTN_L, then check for pulse at PM_SLP_S4_L, at same time.
Use SMC_ONOFF_L pads to simulate power button, not keeping the line down.
 
M

MeTech Turkey

Member
PM_SLP_S4_L on this line without trigger way there is always a pulse from 0.00V to 3.4V but nothing effecting when we trigger the SMC_ONOFF
3V3_S5 =3.3V
3V3_SUS = 3.3V too
 
2informaticos

2informaticos

Administrator
Staff member
Then check if other big coils pulse in same manner.
I was thinking about L7270.
L5750 receives 5V_S0, so you should get pulse on many more coils.
Pay atention to L7510/50.

Check what happens in SMC bypass mode.
 
M

MeTech Turkey

Member
I got no V on L7510 and L7550 if you meant so and unfortunately I can't see any L7270 on the boardview.
I think you meant L7220 it is same with L5750 pulse 5V every 5 sec
 
M

MeTech Turkey

Member
No pulse on L7630
Pulse on L7330
Pulse on L7100
Pulse on L7030
pulse between 1V - 2V on L3895
Pulse on L7720
Pulse between 3V - 4.8V on L4605
 
2informaticos

2informaticos

Administrator
Staff member

HOW TO collection

I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...
boards.rossmanngroup.com
 
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