PS3 Sixaxis won't connect after cleaning

[nullsanity]

Hi all,

gave my sixaxis controller a clean and after reassembly, it won't connect.

Symptoms:
When wireless, pressing PS button does nothing.
When wireless, pressing reset button does nothing.

When wired to PS3, slow blinking 4 lights appear. Pressing PS button does nothing. Pressing reset button makes the blinking stop, letting go of reset button resumes blinking.

I checked the caps on the board, all seems good.
Battery has 4.1v in it
Manually shorting the PS button contacts does nothing.

One thing I noticed is that the negative leg of the battery port shorts to GND, not sure if that is normal or not.
Not sure what else to check at this point.

 

[NightLess]

Did you miss the black sponge holding down the conductive film?

 

[nullsanity]

Did you miss the black sponge holding down the conductive film?

Thanks for the suggestion. I don't think I have that part. I just tried reassembling it now and it works as normal. I have no idea what is different this time. Maybe reseeding the flex-pcb did the trick? Anyway, it works fine now, wired and wireless.