820-00840 - no CPU activity

Rper123

New member
Hi,
No sign of corrosion. 20V on both USB-C ports. 0,33-0,037A. Fan starts, but no chime, no activity on external USB or image on external display.
L7210/L7220 0,9V which seems ok to me. Where to start?
 

2informaticos

Administrator
Staff member
When board works, cannot drop to 0.037A.

Did you try the board alone, no device connected?
Keep only charger and USB test pendrive.

Try new BIOS, just in case.
 

Rper123

New member
I looked wrong. It took 0.37A.
Just replaced BIOS from a donor board before I read your post. It shows the image of apple now. I don't have BIOS programmer. Have to order reprogrammed BIOS chip from Ebay.uk.
Thanks 2informaticos (y)
 
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