820-01041 5v .3-.4amp

[Clever1]

Have a 820-01041 that was in last week for no power no charge, found to be cd3215. Fixed that and unit was working properly for about a week. Customer brought it back in and said it stopped working again.

Unit draws 5v .3-.4amps and stays there, used thermal and found T2 is getting warm 28-30c. Tried DFU with known good cable but it keeps telling me the thunderbolt accessory cannot be used and to use a thunderbolt capable cable, I've tried 2 cables i know work.

I started checking around the original repair and other cd3215 and they all are getting their LDO. can post Diode if needed.

U7000
P_IN- 5v
AUX_DET-1.5v
SMC_RST_IN- 0.0v
VDDA- 5v
VDDP- 5v
SMC_RST- 1.7v
AMON- 0.0v
BMON- 0.0v

Kind of stuck at this point thinking T2 is hosed. any help would be appreciated.

 

[2informaticos]

The client may be using crap charger, which damage the input chips.

I recommend first to reball, at least reflow, the chip you've changed.

Do you get PPBUS_G3H and 3V3_G3H_RTC voltages?

 

[Clever1]

That is exactly what i told him, stop using cheap chargers.

Reballed the original chip.

PPBUS_G3H- 12.2v
3v3_G3H_RTC_R/X - 3.3/3.3

 

[Clever1]

U3200
PP1v8_UPS_XB_LDO- .495
PP1v1_UPC_XB_LDO_BMC- .528
PP3v3_UPC_XB_LDO- .533
PP1v8_UPC_XB_LDOA- .540
U3100
.493
.525
.518
.538
U3000
.494
.529
.529
.540
U4000
.493
.526
.526
.539

Respectively

I am not seeing a lot of deviation on these readings. Looks like u3200 and u3100 have a deviation on the PP3v3LDO with u3100 having the largest.

 

[2informaticos]

WAs U3100 the one you've changed?
Try another chip...

 

[Clever1]

swapped chip only change is PP3v3_UPC_LDO reading lower @ .508, i have another chip i know is good prob going to swap that one on and see.