A1707 not powering on

[hgoncalves]

U7650

PIN 12 = 1.8
PIN 13 = 0V
PIN 22 = 3.5V
PIN 23 = 12.5V
PIN 29 = 016.7 mV

 

[2informaticos]

Follow schematic and try to understand what I've asked you to do.
Pins 12 and 22 must have the same voltage...

 

[hgoncalves]

Well, after soldering back R8110 and R7663 i get the following in U7650:

PIN 12 = 3.3V
PIN 13 = 1.9V
PIN 22 = 3.6V
PIN 23 = 12.5V
PIN 29 = 05.1V

 

[2informaticos]

All these stable?
You should try to resolder R7643 too now.
Do you resolder R8110 and still keep the mentioned wire between C7653 and PM_EN_PVXS5???

 

[hgoncalves]

Yes, i´ve already solder R7643, and the voltages are all stable.
No, i removed the jumper in C7653

 

[2informaticos]

So you have steady SMC_PM_G2_EN, with R8110 and both R7643/63 in place?

 

[hgoncalves]

Yes, SMC_PM_G2_EN is steay at 3.3V

 

[2informaticos]

Then you should have 3V at pin 21/U7650 too.
And 3V3_S5 should be present at L7660.

 

[hgoncalves]

Well, right now it seams to be dead. Out of the blue, over night, it died.
Now in the USB amp it takes 4.98V and 0.14 mA

 

[2informaticos]

SMC_PM_G2_EN fluctuates again?
You can have problems with SMC, or U7800...

 

[hgoncalves]

It doesn´t fluctuate. It's 0V

 

[2informaticos]

Do you get correct 3V3_G3H and PPBUS_G3H now?

 

[hgoncalves]

Hello,
No. We have 0V in both 3V3_G3H and PPBUS_G3H.
On the ampmeter it is pulling only 4.97V and 0.13A

 

[2informaticos]

0.13A is high current in this conditions.
Do you get voltage at R7020?
Check LDO outputs of all CD3215 chips also.