820-3462A dead no green light sometimes green like on

[Arka_19]

macbook pro a1425 dead code motherboard 820-2462

no green light

ppdcin_g3h + 19v
pp3v42_g3h 3,42v
pp5v1_chgr_vdd 5,4v
smc_reset_l 3,3v

what to check again for next

 

[2informaticos]

First of all, welcome to the forum!

Post exact PPBUS_G3H voltage (without battery).
Did you try known good DCIN board?
Also post U6900 voltages, when no green light present.

 

[Arka_19]

thanks

PPBUS_G3H is 12.3v without battery
yes i replace it but same

u6900 voltage
1 . smc_bc_acok_vcc 3.4v
2 grounds
3 unconnected
4 sys_onewire 3v
5 adapter_sense 3v

 

[2informaticos]

12.3V for sure?
Then bad communication between SMC and ISL6259.
Check voltage and diode mode to ground on SCL/SDA lines of battery bus.
Be sure to use original Apple charger, preferible 60W.

 

[Arka_19]

12.3V for sure?
Then bad communication between SMC and ISL6259.
Check voltage and diode mode to ground on SCL/SDA lines of battery bus.
Be sure to use original Apple charger, preferible 60W.

yes i am sure ppbus_g3h is 12.3v
scl and sda is 3,4v diode mode is 0,512

i use 85w magsave and tested for my macbook to charge

 

[2informaticos]

Any history available, liquid sign?

Check SMC voltages at page 39; U4900 (2 OF 2).
Do you get correct 12MHz at Y5010?

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