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Question about Panasonic PT-51G44 51" Rear Projection Television

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Picture distortion The picture is starting to hour glass and you can't see the top or bottom of the display

Posted by Rex Chickering on

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  • 277 Answers

Hope u still have warranty call a pro windman

Posted on Jan 31, 2006

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The picture on my Sony is shaped like an hour glass

There is an apparatus on the back of your picture tube called a yoke.This distributes your picture on your pic tube uniformly.If this or the circuits enabling it malfunction,then you will get distortion-namely an hour glass shape.Tv has to be trouble shooted.
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Hour glass bowing on the top and bottom of my HCP4752W Samsung

Check the resistors near the ic, and the fuses to the ic's, i bet you will find an open fuse. the fuse will look similar to a resistor without color bands. use a dvm and set it on ohms, with the tv turned off.
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Picture is all distorted ,colors dont match up need 3d glasses to watch

HI, this is basic convergence failure. the convergence board controls the RGB stream and , if its malfunctioning or, the convergence chip set is damaged, it will distort the entire display and the colors will not be regulated correctly as you are experiencing at this time.

simply replacing the convergence board in this unit will fix your issue.
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Pt-47wx49e convergence problem

I just replaced the 2 convergance chips, but it did not seem to fix the problem. I then tested all the resistors that feed the convergence chips anf there was a 2.2 ohm fusable blown. IT was R7050 on mine. That seemed to fix it so that I could adjust all the colors through the convergence 2 screen. There seems to be a slight bow near the bottom when you look at the c2 screen, but not noticable when you are watching a picture. Since I got this broken, I am not sure how perfect it should be.

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Distorted picture

You need to re-solder the circuit board that contains the STK convergence modules. They're on the center circuit board attached to an aluminum heat sink that's about 8" long and 6" tall, about dead center in the circuit board. You may be able to recreate the problem (hour glass effect) by gently moving the heat sink (which the modules are connected to). This gives the hour glass effect on the picture and the advanced convergence screen. This is an indication that the modules pins aren't solidly connected (meaning soldered) properly. Remove the circuit board and clean the old solder off & resolder the modules pins to the circuit board reconnected the board and then retest by again pushing on the heat sink. This is a caused by a minimum effort (a.k.a. minimum cost) solder job, probably done in some 3rd world sweat shop. The "factory" job was good enough for 3-4 years but the heat (and these modules do create a lot of heat) and stress created from repeated use eventually takes it's toll, weakens the pin connections and our problem occurs. take the appropriate cautions working around the high voltage of the set & use a non-conduting piece of wood to push the heat sink when doing tests. Best of luck, hope ya fix it.
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Hour glass picture

I would suspect that the convergency amplifiers ICs are not working.
Are the colours distorted?
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Diagonal lines moving from bottom to top

sample of a line diagnally from bottom to top of page.
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3 curved lines top & bottom/blurred picture

This indicates a convergence problem..convergence power supply probally.. however ive seen 2 other cuicits cause this ..
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Picture Distortion

you have a convergence problem.. If you understand how this works then you can go into the set find the convergence ic's and replace them and sometimes you need to do some alighnment as well. Its always best though to let a service tech do a job like this as he will have all the proper equipment to adjust and troubleshoot the set Good luck
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