[SOLVED]820-4924, No voltages anywhere, I'm missing something?

Status
Not open for further replies.

SMMRepair

Member
I'm working on an 820-4924 board that had liquid, and has no green light or signs of life *at all*. I'm missing PPDCIN_G3H and even PP18V5_DCIN_FUSE is 0v. There WAS liquid to the DC-In connector and pins 1 and 2 are corroded looking, but after scraping away a bit of corrosion and checking continuity through the connector, it seems fine. I ran a wire through the board to ADAPTER_SENSE just in case the through-hole was corroded, but no dice.

1. No green light, no activity at all on charger. Board DOES power on from battery.
2. Diode for J7000: 1: 1.89; 2: 1.89; 3: OL; 4: ground; 5: ground; 6: .588.
3. 0V at F7005.

I can't help but think I'm missing something obvious. I can pull the actual DC-In connector, but I don't think it's damaged enough to cause the charger to go into protection (I think is what's happening?). I don't detect any shorts on ppbus, 3v42, etc., but I don't think a short would prevent any voltage at all on the DC-In connector, right? Unless the short was on PPDCIN_G3H, etc., but there isn't.

I haven't checked much beyond the above because I don't think anything would matter this early in the circuit/power-on sequence. With 0v at F7005, I need to start here, correct?

I feel like this will be an easy one, once I've figured it out (of course). All help appreciated!
 
Last edited:

SMMRepair

Member
I'm terrible about this, but I got this one solved. The connector was at fault. Didn't "look" too bad, but when I pulled it, there was a ~.25" dried/hardened "pool" of delicious coca cola. Got it cleaned/replaced and green light returned.

Will update thread in ~1 hour once I confirm board works, but initial issue is resolved.
 
Status
Not open for further replies.
Top