Hello all! Got a 1999 Panasonic CT-27624A with a AP335 chassis, it may have been dropped.... Cut the tv on and things will be great for hours, but if the channel is changed or sometimes out of the blue the picture will get wavey and "jerk" then be fine then maybe a few minutes later do it again until eventually the picture blinks and fades all the way out to mostly dark with faint sqiggles, etc. or goes black ... sound will still be fine. I CAN SHAKE OR MOVE THE TV AND THE PICTURE COMES BACK ON. If I cut it off for a while and cut it back on it may be fine, but sometimes when I do that and cut it back on the screen is black but sound is perfect ...when that happens I have to unplug it for a while then when I plug it back in and cut it on it will be fine . Went thru 40 pages of posts but can't seem to track down anyone with this problem/solution. Can't replace tv as I'm laid off so got to try an fix her myself if possible ... do have soldering experiance. Post on another site says check board for broken solder ...i.e. ( "If the picture faded away on the order of 10-20 seconds (and if it comes back, also comes up to full brightness in same time frame - possibly with the persuasion of some careful whacking) AND with NO other significant changes such as size, focus, etc., then take a look in the back of the tube for the filament to be lit - the orange glow near the CRT socket. If there is none, then you probably have a bad solder connection on the circuit board on the neck of the CRT. Look for fine cracks around pins on that board. Try prodding it with an insulating stick to see if the picture comes back. Resolder if necessary") Ok, can I use a wood popsicle stick in place of an "insulating stick" to poke at the board? And, exactly what/where is this circuit board on the neck of the crt, ( what the hell is a crt?)?
If it has been dropped then its a crap shoot in the dark on where your problem is. It could be ring cracks around the flyback transformer? It could be anywhere and there is no set answers to your problem. Im sorry to inform you my friend, but It is not an easy repair , even for a seasoned tech, on a problem such as this. It is going to take a schematic, know how on reading a schematic, and when the set is acting up, the know how on following the curcuit flow and block diagrams on following where to check for problems. I only wish , in my 38 years + experience, repairing TVs and electronics, I could fix a dropped set right off the bat. You can read my friend till your eyes bleed(but dont really LOL), and its all going to be a matter of troubleshooting with a schematic. Good luck and if you do find a solution, please share with us as maybe it will help another in the same situation.
Thanks much for the feedback Larry, but I've still got to give it my best ... which brings me back to what is the crt and is it safe to test with wood?
The CRT is the picture tube Also called the Cathode Ray Tube very soon to be a thing of the past as tube type TV sets are.