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Old 11-07-2021, 11:39 PM   #1
wnt2fx
New Member
 
Join Date: May 2021
City & State: Berlin
My Country: Germany
I'm a: Knowledge Seeker
Posts: 16
Default 820-01700 5v 0.25 a

Hello everybody, I am a little desperate understanding this t2 board. Somebody worked on it before ( u3100) I guess reflowed. Liquid damage hit mainly the right wing but also u7800 area. L7811 looked horrible.

First thing I did was carving out a short on ppbus ssd0. Not so much maybe 2 three layers deep "just" in the extent of pad 1 of c9573.

I do not have the battery here.
On all ports except on the master u3100 (XA= 0.01A and no pbus) I get 5v going up in 2 steps within 2 seconds to 0.24A and stays stable there. The only thing I notice gets warm is the t2 area and pp3v3_g3h_rtc supply. Not hot, only 30 C

The last line in power sequence I get is PMU_ACTIVE_READY If I remeber right it is at 1.7v. I did not check all lines in the sequence there but many and they are all present in correct value e.g.

PP1V1_SLPDDR

PP0V9_SLPDDR

PP0V82_SLPS2R

PP0V8_SLPS2R

PP1V1_SLPS2R

PP1V8_SLPS2R

https://logi.wiki/index.php/T2_and_C...28820-01700.29

I do not have

PMU_VDDMAIN_EN

I replaced u3100 but unchanged.

I checked some t2 lines to gnd ( logiwiki, me: redGND, blackGND )

PPVDDCPU_AWAKE 10-15 Ohm 18 19

PP0V82SLPDDR 30-40 Ohm 40 45

PPVSSCPUSRAM_AWAKE 100-120 Ohm 170 253

PP1V1_SLPS2R 1-2 kOhm 5,9k 5,3k

PP0V9_SLPDDR 40 Ohm 55 61

PP1V8_SLPS2R 4 kOhm 200k 13k


will take a big nap now. After some hints / ideas I am more than willing to note down more measurements. best regards,

k
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