MacBook pro 820-00239 power issue

[EZBoard]

hello,
i am new to this forum.
my name is Amir and i owe a electric repair shop in Israel.
i am new to MacBook repairs and have lot of knowledge to complete.
as for now i have a MacBook pro model 820-00239 that wont start.
the customer probably connected 3rd party charger and now it wont power at all.
as for start i checked for blown component under my microscope and found nothing.
when i connect the charger to the left side, both take 5v.
when i connect the charger to the right side i have 0V on both.
can you please guide me were to check?

 

[2informaticos]

First of all, welcome to the forum!

Check diode mode to ground on CC1/2 pins of CD3215 chips from right side; compare readings with left side.
Do the same for LDO power rails of these chips; each one has 4 LDOs, consult schematic.

 

[EZBoard]

	ub300[V]	ub3100 [V]	ub400 [V]	ub3200 [V]
CC1	0.5	0.59	0.002	0.6
CC2	0.001	0.58	0.001	0.6
PP1V8 LDO (PIN2)	0.47	0.47	0.002	0.47
PP3V3 LDO (PIN12,53)	0.021	0.49	0.009	0.49
PP1V1 LDO (PIN 35)	0.48	0.49	0.485	0.49
PP1v8 LDOA (PIN 75)	0.5	0.5	0.5	0.5

 

[2informaticos]

Change UB400 first...

 

[EZBoard]

ok, thanks
parts are not availble here....
i need to order from other country and it takes time.
in such cases, from your knowledge, do you think it will be enough? of maybe usually other componnent need to be changed?
i am asking so i will order it together and save time

 

[2informaticos]

This is not an exact science.
Even replacement CD3215 can be bad (usual from chinese sellers) and you can waste time then, searching for another (inexistent) problem.

 

[EZBoard]

can you, please, guide me were i can buy them?
i tried to order from your store, but you have only one in stock...

 

[2informaticos]

Is not my store!

As recently posted in other thread, I prefer "board wings" to get original chips.

A1707 Liquid Damage - Stuck at 5V on USB

Hi! I'm an electronics student from Austria trying to fix a Macbook Pro A1707 from a friend of mine. He took it to an Apple store and they said it is a liquid damage and wanted to charge him 1300€ for a new logic board. Thus, he asked me if I could fix it. I have watched numerous videos from...

boards.rossmanngroup.com

Reading all the threads you can get valuable information.
Take notes from each post which think can help you in the future.

 

[EZBoard]

so,
i got new CD3215 from beetstech.com
when i disordered the old one i pulled out lot of pads from the board because of the glue.
i fixed them all and soldered the new one, but still i have 5V.
can you please guide me what how to proceed..

 

[2informaticos]

You must be sure CD3215 area real good and correctly soldered.
Do you get 1V1 LDO for all them?

 

[EZBoard]

all LDO should be 1.1V?
just to be sure, when you say LDO, you mean pins 2,12,35,53,75 on CD3215?

 

[2informaticos]

NO, I mean 1V1 LDO.
There are also 1V8 and 3V3 LDO rails.
You should be able to detect these lines by yourself, without writing entire names; 4 (four) on each CD3215 chip.