820-00430-A iMac A1418 imac2015

[2informaticos]

New coin cell?
Check its voltage out and onboard.
Looks like you have a problem on RTC power line; PCH is the first suspect there.

 

[lincev]

yes, its new and good brand "Duracell"

Voltage 2,83v, ok check PCH thanks

 

[lincev]

I check. C1300 and I have short, but remove this and pin2 PCH_SRTCRST_L I have short to ground

and R1300 with short to ground in line PP3V3_G3 and check C1930 and Q1930 but is good


uffff

 

[2informaticos]

"PCH is the first suspect there"
Keep in mind that...

 

[lincev]

Excuse my lack of knowledge, do u mean that I check these lines (image I attached) in search of a shorted capacitor or any damaged component?

 

[2informaticos]

NO.

You've already found a short on PCH_SRTCRST_L.
Which persists after removing C1300.
Guess what now?
Bad PCH...

I hope, you've removed coin cell before checking there in diode mode!

 

[lincev]

ah ok now I understand, sorry and thanks for all

yes ! pretty first the coin cell, fuck bad PCH chipset

thanks again