A1425 820-3462-A no power

[hgoncalves]

Hi,

I have an A1425 820-3462-A that has no power and no green light.

On PPBUS_G3H I only get 12,28V. Is that a normal value for this board?

 

[hgoncalves]

Hi,

I have 3.412 on 3V42_G3H and also on SMC_RESET_L

I don't see any corrosion on SMC or U7000

Pins 10 and 11 (SMBUS_SMC_5_G3_SDA/SCL) on U7000 have 3.4V

SMC_BC_ACOK has 3.22V on U7000

 

[2informaticos]

Diode mode to ground at SCL/SDA lines of battery bus?

Do you get 12MHZ at Y5010?

 

[2informaticos]

What about D6950, or R5280/81?

 

[hgoncalves]

OK, sorry. I was searching something else...

Diode:
SMBUS_SMC_5_G3_SDA = 0.522
SMBUS_SMC_5_G3_SCL = 0.526

 

[2informaticos]

Check signals and voltages for U4900 (2 OF 2), at page 39.

 

[hgoncalves]

U4900 (2 OF 2) :
SMC_RESET_L = 3.4V
SMC_EXTAL = 0.477V
SMC_XTAL = 0.001V
SMC_CLK32K = 0.020V
SMC_TCK = 3.4V
SMC_TMS = 3.4V
SMC_TDO = 3.4V
SMC_TDI = 3.4V
PP3V3_S5_AVREF_SMC = 3.299V
PP1V2_S5_SMC_VDDC = 1.2V

 

[2informaticos]

Try another SMC...

 

[hgoncalves]

I don't have any other A1425 820-3462-A board. I think I know the answer but, can I use an SMC from another board (A1466)?

 

[2informaticos]

NO...

 

[hgoncalves]

You're right. It was the SMC.
TKS!