Question about Zenith IQB36B42W TV

Picture Shortens, Converges, eventually the set shuts off - $50 for Correct Solution

I'll send $50 to anyone who provides me a no cost/low cost fix to this problem (i.e. I implement the fix myself) Problem just started occuring on my 7 year old set. Unit is a Zenith Inteq, Model # IQB36B42W, S/N 921-66420206. The picture goes from normal to sometimes having thin black horizontal lines breaking up the picture such that about 75% of the total picture is viewable (it still looks OK, but not normal), other times the height shrinks and I have a black border on the top and bottom of the picture, but MOST of the time the picture shrinks in height and the BOTTOM of the picture converges (does not go across the entire length of the screen) while the top of the picture stays the proper length across the entire screen. The set eventually shuts off after anywhere from 1 minute to an hour or so. Additionally, if I use my fist and lightly hit the back of the TV, the set resets itself to a normal picture for awhile, then the sequence starts all over again. Any suggestions are appreciated.

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77 Answers

Open the TV amd turn it on in a position you can see the picture, possibly through a mirror. Now gently tap all of the metal heat sinks on the circuit board until you find the one that is sensitive it will have a small chip mounted vertically on it, with probably like 7-10 pins. The number on the chip will most likely be an "LA****" number. Now turn the circuit board (UNPLUG FIRST) over and resolder the pins. This is your problem 99% of the time. Be very careful there is High Voltage inside this TV.

Posted on Apr 26, 2007

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