TiBook sound through one channel...but only in new case, and not the speaker's fault

[s_pupp]

I could use some advice regarding what steps to take in the following problem:

I have a TiBook G4 1GHz board in a banged-up case that I want to put into a new case (sold as new by Sunshine Express on eBay).

In the old case, both audio channels work.  In the new case, only the left channel works; there is no sound at all out of the right channel.  Two other logic boards do the same thing in this new case.

Steps taken:

Step 1:  Replaced both speakers with known working ones (the logic board connects to the left speaker which then sends a signal to the right, so a problem with the connector on the left speaker could affect the right)

Step 2:  Replaced the wire connecting the right speaker to the left speaker with a known working one (although the old one tested OK with my multimeter)

So:  It's not the logic board, not the speakers, not the wire connecting the speakers...I'm out of ideas.

With there being no problem at all with all the same equipment in the old case, I'm stuck with the possibility that the case is haunted, and just *&*#ing with me.

I could use a rational mind to convince me otherwise.

 

[ScutBoy]

I'm seeing the same thing: I've got Ti Powerbooks that either do or don't have sound out of the speakers, depending on which top case I use. Sound out of the headphone jack works OK.

Swapping logic boards doesn't make a difference. Have not gone so far as to pulling speakers, etc.

Like you, it's the better quality top case that has no sound :-(

 

[s_pupp]

In my case, it turned out that the known good replacement speaker was, in fact, also bad; perhaps a casualty of the extraction from its previous case top.

 

[ScutBoy]

Beyond the logic board removal,  how much more work is it to extract the speaker(s)? it looks like most of the rest of the top case has to come apart. I'm not sure it's worth the work for the use case I have for this guy, but then again my urge to have a "fully functional" machine is strong

 

[s_pupp]

It was bit of a pain to do, and involved the almost total disassembly of the Powerbook.  ifixit.com is very helpful for this.

I stuck a flat metal tool under the speaker and gently pushed until the speaker was free.

I then rubbed the adhesive off the speaker, and applied 3M 300LSE transfer tape to adhere the speaker to its new speaker grille.