Panasonic TC - 29 gf12g color television images and sound good when not good (small image normal fault occurs). Will screen separator to the size of the rf switch output coupling experiment, normal and small big picture but sometimes fails, carefully observe the separator circuit board, found no solder joints. JZ6service manual download site
 JZ6service manual download site
With all insulating rod in turn components related to the big screen channel, when touched the gain amplifier transistor, image change is more obvious. After the increase the intensity of vibration, found the tube C circuit board attached is not tight, has the feeling of loose, add this point after welding, the fault disappear.JZ6service manual download site