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820-00045 5.10V on PPDCIN

R

Ryanlen2

Member
No sign of liquid.

came in with 5.10 V on PPDCIN

Had a 1.ohm short on PP3V3R3V0_AON. Found shorts on u4600 and u4700. Replaced them and now have 2.588kohm on PP3V3R3V0_AON.

Replaced ISL and had PP3V3R3V0_AON, but now its gone and I dont have anything on PPDCIN anymore either.


PPDCIN - 28.51 kohm.

The only original charger I have is an 87 W USB C, so I have been using a couple adapters from 60 w Magsafe 2.


Thanks.
 
2informaticos

2informaticos

Administrator
Staff member
So you don't get anything from charger now?
PP3V3R3V0_AON is 0V, as PPDCIN too?
Change U4700 again; maybe U4600 too.
 
Last edited:
R

Ryanlen2

Member
Is there stencils available to reball these chips that you know of? U4600, U4650, ISL?

These chips came off of donor and I would feel more confident in their functionality if I could reball them

You mentioned that U7100 has firmware. Does that mean that I cannot buy individually, that is has to come off of a donor?

Thank you!
 
2informaticos

2informaticos

Administrator
Staff member
These small chips don't need reball usually.
Just be sure no big difference between pads and solder directly.
 
R

Ryanlen2

Member
Replaced U4700 and U4600, still 0 voltage on F4700.

PP3V3R3V0_AON - .005V / 8.05K Resistance. (seems high)

Feeling Lost, LOL.
 
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