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820-02020 no power

K

Kyle93

Active member
Arrived with no power and only 5v with UF500 Port power cycling. Replaced UF500 and UF400 from good donar board but no change. DZF664 had a burn mark on it. Replaced it but also no change. PP3V3_AON i8s 0v. UF400 power cycles as well except stays at 0v 0amp

What should be checked next?
 
2informaticos

2informaticos

Administrator
Staff member
Did you maintain correct postion for UF400/500 when replaced them?

Remove F5200 and check C5250 voltage.
 
2informaticos

2informaticos

Administrator
Staff member
So your problem resides on a secondary power supply.
First, check diode mode to ground at F5200 output pad.
Also check on 3V8_AON, 3V3/5V_S2.
 
K

Kyle93

Active member
Only UF500 port cycles within two seconds with 0 amp draw while UF400 draws 0.150amps and takes several seconds to power cycle. Are you sure something in USB-C area does not need to be checked?
 
K

Kyle93

Active member
PPBUS_AON and 5V_S2 are stable

power cycles on off on amp meter still occur on both ports. UF400 goes up to 0.104amps before cycling which takes several seconds however UF500 port just stays at 0v 0amp and cycles every other second
 
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K

Kyle93

Active member
which specific things should be checked? Ive compared diode mode readings to both areas and everything matches
 
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