Apple 820-01326-05 after water spill not start

[ktmmotocross]

Hello.
I have this Apple 820-01326-05 that after water spill wont start.

Chcrger works but charging is in loop. USB-C negotiate to 20V ok, slowly start charging from 0.4A to 0.9A and after that it reset to 0.05A and after 1 sec goes from 0.4A again. loop takes about 6-7 seconds

I found 12.9V, 20.5V, 3.3V. no short.

now i dont have schema or BV so i cannot measure more

laptop was in other shop so i cannot find water spill corosion

[piernov]

Re: Apple 820-01326-05 after water spill not start

https://logi.wiki/index.php/Schemati...in_Logic_Board

820-01326 ❌ ❌ Use 820-01041 boardview and schematic, 820-01326 unavailable, only difference is Vega GPU as far as i know

[ktmmotocross]

Re: Apple 820-01326-05 after water spill not start

thanks. interresting site.

DOnt have enybody some starting list of rails for this newer macs?

[ktmmotocross]

Re: Apple 820-01326-05 after water spill not start

I found that U7650 have bad V5REG signal/only one pulse in2sec loop/so i replace IC. now i have stableV5REG, V3REG,G3_HOT, 3.3V ALW, but charger still charge untill draw 1A and then reset to 0.0A and start charging again

i also dont have

[ktmmotocross]

Re: Apple 820-01326-05 after water spill not start

found
SMC_SYSRST_L - 0.0V
SMC_PCH_SYS_PWROK - 0.0V
SMC_PCH_PWROK - 0.0V
SMC_RSMRST_L - 0.0V

so looks like my SMC is not work

[ktmmotocross]

Re: Apple 820-01326-05 after water spill not start

this guy have starting sequence diagram for A1990. where can i get one?

https://www.youtube.com/watch?v=aTV7dAtSb9E

[piernov]

Re: Apple 820-01326-05 after water spill not start

https://logi.wiki/index.php/T2_and_C...ence#820-01598

[ktmmotocross]

Re: Apple 820-01326-05 after water spill not start

veeery nice. i came to half by screen capture his video, but this is way better

found that this voltage loop works only on charger on battery i have steady voltage

but still no work even only on battery. i found that CHGR_RST_IN_R is constant 0.0V and not reacting on power button. what is it state when work?

[ktmmotocross]

Re: Apple 820-01326-05 after water spill not start

nobody knows what this signal suppost to look like?

[weritoamador]

Re: Apple 820-01326-05 after water spill not start

I found that U7650 have bad V5REG signal/only one pulse in2sec loop/so i replace IC. now i have stableV5REG, V3REG,G3_HOT, 3.3V ALW, but charger still charge untill draw 1A and then reset to 0.0A and start charging again

i also dont have

thanks!