A1707 820-00928-A No Sound No image

tipoti

Member
The device is extremely dusty and runny. The customer said that the screen did not come after doing the Recovery.
It draws 1.61 amps without the battery. The fan is spinning, no boot sound, no picture. Is it possible that the amd graphics card is faulty?
 

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2informaticos

Administrator
Staff member
I suppose you have 00928 board on the desk.

Failing software upgrade can cause BIOS corruption.
Try known good full BIOS, with clean ME.
 

tipoti

Member
I tried me bios and different bios. I tried a total of 2 bios But the same fan is spinning again, no sound, no picture 1.37 Amps
 

2informaticos

Administrator
Staff member
Always test USB activity, apart of internal video and chime.

Did it fail in recovery process, or stopped to work after recovery was completed (next reboot)?
Was there a macOS upgrade involved?
 

tipoti

Member
It shows 5 volts on the usb, but when I insert the flash disk, I noticed that the green light on it does not come on.

I just know it didn't come after recovery
 

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2informaticos

Administrator
Staff member
CPU core should drop from 1V to 0.6V aprox, when board really boots.

Clean ME of original BIOS will not help; as corruption is expected on the pure BIOS section, not on ME.
Where did you get another full BIOS?
Board should boot even with dirty ME, like dump read from other similar board.
Clean ME must be done at the end.
 

tipoti

Member
I tried 5 different bios. Currently there is no voltage on the LA640. If there is no voltage here, does the opening sound come out under normal conditions?
do these coils have anything to do with the u9850?
 

tipoti

Member
I tried old bios and different bios. now it stays at 0.02 amps and won't turn on. I did nothing but write bios. now it won't open again on the original bios file 0.02😩
 
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