Someone brought by a '99 27" Zenith with a bonded yoke Thomson CRT that they wanted fixed. They said it had audio; but, no picture. Upon testing, it indeed had no picture except for the OSD and menu. Upon further examination, I turned up the master G2 control and got a washed out B&W picture. Going into the menu and running the picture and color controls up and down did nothing whatsoever.
In the past, I seem to remember replacing a few jungle IC's in late '90's Zeniths for similar problems. I think I remember one where the color was wide open and another one that had no horizontal drive coming out of the IC.
This set uses a Toshiba TA1268N 56-pin jungle IC and I happened to have one on a junk board. After the IC was replaced, the set worked normally. The set still had a repair tag from '09 taped to the back and it was obvious that this same IC had been replaced at one time.
I seem to remember the technician at the local Zenith dealer telling me that this jungle IC was a high failure part. I wonder if they failed due to an internal defect or if they were sensitive to lightning/power surges.
Here's a video I made of the set:
http://www.youtube.com/watch?v=qtwKQ...uEQR0s012gYR4Y