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820-01814 no image

T

thomamagic

Member
hello,
i have short on PPBUS_G3H and see C4606 is dead
i have remove the machine start but no image
i have led on caps lock but nothing other
I enter in dfu and restore it but no logo nothing again
Replace for test with new screen and new lvds cable between mainboard to screen and same
 
T

thomamagic

Member
hello,
i have short on PPBUS_G3H and see C4606 is dead
i have remove the machine start but no image
i have led on caps lock but nothing other
I enter in dfu and restore it but no logo nothing again
Replace for test with new screen and new lvds cable between mainboard to screen and same
 
T

thomamagic

Member
the machine worked perfectly. The customer wanted to restore the system, everything went well, he turned it off normally and put it away. then 1 week later he wanted to turn it back on, no more signs of life. he changed the battery and the same thing
At that moment he decides to bring it to us and we notice a short circuit onPPBUS_G3H
we have remove bad caps after inject voltage 1v en this
Fan start, caps lock led ok but no sound when start.
I dont have signal in external with usb-c hdmi adapter
 
2informaticos

2informaticos

Administrator
Staff member
If Caps Lock LED reacts, strange to miss USB activity and external video.
Check if machine goes into target disk mode at least.
 
T

thomamagic

Member
yes very strange
i enter correct in dfu and restore correct
I start in target mode when push T button but not recognisez with the second machine
 
2informaticos

2informaticos

Administrator
Staff member
You should get external video, if internal LCD is disconnected; no matters if macOS installed, or not.

U6400 can be removed, but I doubt to be the culprit, if no corrosion there.
 
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