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"Are the ribbon cables soldered into the PCB'S, or do they have 'typical' 2-row header sockets that mate with opposite gender header pins like old IDE hard drive cables? If the latter, they are probably IDC type (insulation displacement connector). If they can be disconnected at both ends you can gently apply pressure to socket connectors in a flat-jawed vice.
Inspect any soldered cables, especially the movable ones, with magnification for broken connections.
If you can get the PCB(s) out, inspect solder with magnification. That will take a long time, but be patient. That is what is done if a replacement costs much more than your labor for repair, or is unavailable, or not practical for other reasons. You alone get to make the decision whether it's uneconomical or if investing time and fixing something possibly simple has value to you. It's worth the exercise if you see learning from the experience, even if unsuccessful, as having value.
I think either there was a latent solder defect, or maybe cable damage if you were moving it aggressively or beyond it's intended range or frequency of repositioning. Many adjustable items use flex wiring/harnesses that last the products lifetime.
If the problem developed during your actions, you >might< deserve partial credit, but it's more likely something is open-circuited than short-circuited.
Also, search for the board number rather than the model…it may lead you to documentation or an alternate source like a different model.
It often takes good eyes and inspection, rather than knowledge of how it works, to find simple problems. The tech with more experience may not be able to see as well, but can more quickly determine what's economical or not (from a corporate $ perspective)."
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