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Old 11-08-2021, 11:29 AM   #2
wnt2fx
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Join Date: May 2021
City & State: Berlin
My Country: Germany
I'm a: Knowledge Seeker
Posts: 16
Default Re: 820-01700 5v 0.25 a

Ultrasonic cleaning --> still [email protected] on three ports, still [email protected] and so no PPDCIN_XA_G3H_F output on primary port.

The power sequence says "H9M LOAD SECURE ROM, SMC BATTERY TRAP" right before creation of PMU_VDDMAIN_EN. I can get the battery today but wonder if this makes sense as long I have this amperage draw on three an no amps on primary port.

U9580, R5620, C9580, C9581, C9583, C9584 and C9574 were removed in my first test now they are back but no change. I removed them because the area looked hit and after removing R5620 it was clearly a short on PPBUS_G3H_SSD0_SNS. To dig down the short I first removed theese components to then find out that the board is burnshorted in pad1 of C9573.

I noticed a strong difference drop to GND on PP1V8_SSD0 (.06), compared to PP1V8_SSD1.
Injecting 1V draw about a half mA

also
PP2V5_NAND_SSD0
PP0V9_SSD0
have a lower diodedroptoGND compared to their _SSD1 equivalants but not so much.
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