SOURCE: panasonic tv TC-26LX60 PICTURE PROBLEM
if this is under warranty still, i would take it to a service center or rma it to panasonic.. if it is not under warranty, you can try the following.
1) try a different video source and verify the problem is happening on all video sources and modes.
2.a) if the problem is not happening in all modes, remove and replace the cable that is causing the issue. if this doesn't remedy the problem, the controller for that particular input is going out
2.b) if the problem is happening in all modes, you can open the case and carefully disconnect and clean (de-oxit or rid-ox) the hirose style connectors on the back of the display panel.
3) disconnect and clean all ribbon cables around the display panel
this sounds like either the connectors are not performing adequately or are loose, the top ribbon is acting up for some reason, or the graphic controller is going out.
SOURCE: Does the Panasonic TV Model TC-26lx50 have a digital tuner?
Hi mrfeld,
The TC-26x50 has only an analog tuner, if you want to recieve the new broadcast OTA signals you will need a Set Top Box.
Let me know if you need further explanation and please rate this solution. LOne99star
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/jason_77a19afa8d604dee
SOURCE: Pictures shrinks.. Panasonic TC-20LM Television
Shrinking picture is a voltage regulation problem in the switch mode power supply, Possibly a cap used in the feedback circuit. Or an over current condition on the B+. This is a very tech intense repair because there is no magic bullet. If it is shrinking on bright scenes then you can bet it is a regulation problem, bright scenes draw more current from the power supply causing this effect. I would not suspect the horiz output because the regulation for this circuit usually comes from the main switch mode power supply. One diagnostic is to monitor the B+ going to the horizontal output and see if it fluctuates. If so you can bet it is a cap or optical coupler in the switch mode circuit.
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