VideoPhone screen not working

[pentium]

I purchased three AT&T VideoPhone 2500 units and all three worked until (and I assume this is totally unrelated) I pulled the battery on one, then the LCD stop displaying anything other than a black or white screen.
Because I had two other working phones I swapped parts around until I concluded that the issue lay in the logic board above the screen the camera was attached to. Further testing found that when the phone was powered up a Sony CXD1254AR Camera sync and timing signal generator chip was getting near burning to the touch so either it's shorted out or something is shorting it out.
From there I can't really conclude what is at fault, or even why the LCD would even need this chip to operate (just for timing?).

[b700029]

Re: VideoPhone screen not working

Yes, that chip could be generating the refresh for the LCD too. What type of LCD is it? This is more likely if the LCD doesn't have its own controller and simply takes pixel data clocked into it, as opposed to more advanced types that interface to a processor via a databus and have their own controller.

[pentium]

Re: VideoPhone screen not working

I'm not exactly sure of the type of LCD it has. I can't find anything about it in the manual but for 1992 it's an AWFUL color screen. It has some persistence in it I have not seen since the IBM 5151.