VPCSE17FX no audio after disassemble/assemble/baking motherboard

So I had this laptop crashing on me for a while and somehow decided it is GPU (random noise on screen when crashing, sometimes crashing into blue screen). So I disassembled and baked motherboard. Assemble, reinstall windows from rescue partition and all is good except one - no sound.

Now kicker - sound device is visible in device manager and sound chip located on separate daughter board which was not touched at all.

Any clues on what could cause audio disappear? And how get it back?

 

Any one with similar experience? Or any ideas?

 

Is the cable seated properly? Is everything else that is on the daughter board working properly?

Do the usual stuff like opening the mixer and driver properties and making sure the sound is going to the right speaker device, not to something that doesn't exist or is not connected. Then see that it is not muted. There are a lot of driver configuration pages; going through them all takes a bit of time.

 

Yeah, everything else on daughter board works fine (there is touchpad, all leds, switches, something else)

I assembled and disassembled it multiple times. I tried to push flat cables every time to different directions. so far - no luck.

I checked everything in softw2are settings. I even re-installed windows from scratch from recovery partition (i.e. to fully stock condition) - same thing..

 

Hey, did you figure it out what's causing your problem? I have more less same problem with mine VPCSB, I didn't bake motherboard the sound just disappeared, same symptoms as in your situation?

 

Nope. Although I found mic is working. Which is even more weird, since mic is on the same board where speakers are.

murass, did you disassemble your laptop or sound disappeared on its own? Do you see sound device in Device Manager? Is it indicated as operating normally?

 

I got this laptop (VPCSB series) with no hard drive or ram, described as "unknown" condition. Somebody before opened the case so there must have been some sort of fault before. I put in the harddrive, ram, fixed all ribbons as they all were disconnected and laptop is working fine, expect sound, card reader and keyboard backlit. The sound card is shown in device manager and troubleshooting doesn't see any issues with it, but there is no sound coming out from speakers, headphones jack is not working too. Card reader is not even shown in the device manager. I already replaced the daughter board and two ribbons connecting it to the main board, and still the same. It is so weird that everything else works perfect, no blue screens, great performance...

 

hippich, what motherboard does your vaio have?, I wonder is it MBX-237 like mine?

 

murass, not sure if my card reader works.. will check later. as for motherboard - idk. Would hate to disassemble it once again

 

"So I had this laptop crashing on me for a while and somehow decided it is GPU (random noise on screen when crashing, sometimes crashing into blue screen)"

I got that same problem on my little Hannspree. Randomly crashes to a screen full of static/noise, and for the first time it just went from static to black screen. I tried to take it apart but - duh - couldn't even figure out how. Probably just as well.

 

I read service manual and figured out the possible reason speaker doesn't work even you can see level indicator works.
Speakers are dis/enable by PCH chipset.
Pin 34 on connector CN35 (brown cable) from PCH is control signal to disable or enable speaker to pin 1 on realtek chip.
You guys have to check that pin.