820-3435 Fails ASD (no liquid damage)

[DannyRinc]

Got an 820-3435 that says "Battery may not be charging properly"

No liquid damage. DCIN_G3H is at 16.5v, so that would probably be the culprit in my mind? TechTools & Coconut both detect and test out the battery as being fine, charging at a decent rate. Had a problem where it just would not turn on for a bit, then started turning on without issues.

I can order a new DC-IN board but could U7100 be pulling down DCIN_G3H to 16.5 and also keeping it from powering on?

 

[dukefawks]

Tried a known good battery? DCIN at 16V is fine....

 

[DannyRinc]

Tried good battery. Fun update, disconnected battery to plug old one back in and it stopped powering on altogether. Same symptom for when the customer brought it in.

Have PP5v_S5, PP3v3_s5, but no PP5v_s4rs3.

No enable signal, hence no PM_SLP_S4_L

No signs of liquid damage, no signs of corrosion either. Any common issues with these boards?

 

[DannyRinc]

SMC Reflow did nothing, SMC reball fixed it. I'm hoping that's all it is and not a coincidence since it WAS working before, then wasn't, now is again.