I have an 820-00165 board that has no green light. The board had a random failure one day and stopped charging/powering on. Board does not have a single discolored pad or spot of corrosion or any indication of liquid at all. Testing board in one of my known-good assemblies with a genuine charger, of course.
- Nothing gets warm
- No shorts detected on 3v42 or ppbus
- ppbus_g3h is low (8.16v)
- SMC_BC_ACOK is 3.34v at U7100
- CHGR_ACIN is 4.36v at U7100
- SYS_ONEWIRE is 3.42v at pin 19 of J9500
Pretty stumped on this one. I thought for sure there would be a short on ppbus when I saw it only measured 8.16v, but there isn't. Thought maybe U7100 was bad, but it doesn't get warm and is putting out proper SMC_BC_ACOK (CHGR_ACIN is 4.36v).
All help appreciated, duke.
- Nothing gets warm
- No shorts detected on 3v42 or ppbus
- ppbus_g3h is low (8.16v)
- SMC_BC_ACOK is 3.34v at U7100
- CHGR_ACIN is 4.36v at U7100
- SYS_ONEWIRE is 3.42v at pin 19 of J9500
Pretty stumped on this one. I thought for sure there would be a short on ppbus when I saw it only measured 8.16v, but there isn't. Thought maybe U7100 was bad, but it doesn't get warm and is putting out proper SMC_BC_ACOK (CHGR_ACIN is 4.36v).
All help appreciated, duke.