820-4924 Short on PP3V42 found and fixed, no Image still

[tlough75]

Hey all, so I am working on an 820-4924 that came in as no power. After some digging I found a short on PP3V42_G3H because of C5002. after replacing it I now get G3H rails but I am not getting a chime or image. Is it safe to assume the SMC took a shot in the face and is dead? This board was reported to have suffered a liquid event but I didn't notice anything significant. I tried a couple other LCD displays to marule out the display being fried. I also get no USB activity

 

[2informaticos]

No real reason to insist on video, if no USB activity.
This was hundred times mentioned...

Do you get all voltages on the board?
Don't forget to check pages 61/63.
PLT_RESET_L comes high?

You may need to reball SMC.
Also clean J6100 and try known good working BIOS.

 

[tlough75]

Not sure how it happened but after letting the board sit for a while it now works.

 

[tlough75]

So. Have image and everything but keyboard is not being recognized by LB. tried new KB and nothing.

 

[2informaticos]

KB not available into OSX only?
Can you acces boot menu?
Trackpad works correctly?

 

[tlough75]

TPAD works, a note pops on screen saying "no keyboard detected" Use a bluetooth KB or something to that effect.

 

[2informaticos]

"KB not available into OSX only?
Can you acces boot menu?"
???

 

[tlough75]

Sorry I don't understand the question

 

[tlough75]

if the keyboard doesn't work, not sure how I would access the boot menu. I dont have an external KB.Probably shold get one...

 

[2informaticos]

Already mentioned on the forum.
Many MacBooks have two ways to connect KB/TP to PCH, depending if macOS loaded, or not; and this is one of them!