PS Vita 1st Gen , board replaced - no sound from speakers

[90Ninety]

So I picked up a water damaged PS Vita , the Mainboard had corrosion (the button/ controller boards looked fine .) , so I replaced the mainboard . I have installed the mainboard and everything works fine exept , the sound does not go to the speakers - just the headphone jack

I checked the speakers they get 8 Ohms , I check the ribbon connectors they are ok .. Did I get a faulty replacement board , or could it be the controller boards? I ordered some spare green boards just in case these were water damaged too

 

[CMDreamer]

Water damage can be anywhere on the board, even if it's not easily visible it doesn't mean it might not be damaged.

Best thing to do, is testing and discarding of damage each zone of the board and daughter boards. Also don't forget to check/test the flex cables.

If you have a microscope at hand take your time and use it to check them throughly.

 

[The Real Jdbye]

So I picked up a water damaged PS Vita , the Mainboard had corrosion (the button/ controller boards looked fine .) , so I replaced the mainboard . I have installed the mainboard and everything works fine exept , the sound does not go to the speakers - just the headphone jack

I checked the speakers they get 8 Ohms , I check the ribbon connectors they are ok .. Did I get a faulty replacement board , or could it be the controller boards? I ordered some spare green boards just in case these were water damaged too

It's possible you have a damaged headphone jack, it should be fairly simple to solder on a replacement.
I had a DMG game boy with an oxidized headphone jack, and it was always detecting headphones being plugged in, so there was no sound through the speakers.
What I ended up doing was desoldering and disassembling the headphone jack (removing the metal pins) and using a fiberglass brush to scrub off the oxidation on each pin. So I didn't have to buy a replacement. It was a slow and fiddly process, but works perfectly to this day.
There's no guarantee that your issue is the headphone jack, it could be another component. But the headphone jack is in a vulnerable position, so it is a likely culprit.