Question about Panasonic TCL42U25 42 in HD-Ready LCD TV

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Tc-l42u25 picture shrinks up to 1" from the top when first turned on after 20 miuntes ift finally expands to a full screen

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Posted on Jan 02, 2017

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SOURCE: tv picture shrinks to one small line across the middle the screen.

resolder vertical output ic pins

Posted on Apr 27, 2008

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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.

Posted on Oct 10, 2009

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Panasonic viera tv model #TC-L42U25 Had a lightning strike tv went off. Hit power button it comes on no picture or sound then turns off and flashes code 12. Is there any hope? Thanks,Patrick


Most likely your A board, which is the main circuit board. Best to call a technician for that. This may help.

http://electronicshelponline.blogspot.com/2012/05/panasonic-plasma-tv-blinking-codes.html

Apr 21, 2017 | Panasonic Televison & Video

3 Answers

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.

Oct 10, 2009 | Panasonic Televison & Video

2 Answers

Picture from 60" to 19" then gone.


The fluid is a fairly easy replacement. They just need to remove the CRT with the bad fluid and drain the old fluid and clean the CRT and then replace the fluid. The Shrinking is just a Vertical Deflection problem which is also an easy repair. A new Vertical IC and a couple Capacitors. In my shop it would run @ $200.00 to fix both.

Dec 19, 2008 | Philips Magnavox 9P6034C 60" Rear...

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Philips60p8341


If you have any of the following problems you may want to check the site www.tvrepairkits.com for a repair kit. Most of the issue below are fairly common with the older Magnavox projection sets. 

Symptom: Screen shrinks and expands - may or may not correct itself after the TV warms up. After a few days, weeks, or months of having the shrinking/expanding problem you may loose all audio/video but the power light will remain lit!

(Note: The below symptoms typicaly occurs after having the expanding/shrinking screen problem above)

Symptom: No Audio or Video but power light is on

Symptom: Audio works but no Video. Power light still work

Symptom: No Video. Audio is intermittent. Power light still works

Oct 11, 2008 | Philips 60P8341 60" Rear Projection...

1 Answer

When sound & picture finally comes on the picture is pink and in the middle of the screen


This is a common problem with this model. The site www.magnavoxhelp.com has a chip kit to fix the no audio/video and video shrinking problem. 

Sep 06, 2008 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

60" Projection - Screen shrinks down then back up


 
I had the exact same problem. The screen would shrink then expand. After thrity minutes it would correct itself. Then one day it just broke - no sound and no video. I searched these forums but did not find clear instructions on how to fix it. I gave up and called in a repair tech. He fixed my TV in less than 30 minutes.  To help others like me I documented the fix and created a step by quide and repair kit to fix the problem. You can find it here. http://www.magnavoxhelp.com

Jan 19, 2008 | Philips Magnavox 55P9271 55" Rear...

1 Answer

Picture is shrinking from the bottom


Hi you have lose solder in yor vertical section have a tech resolder it or that problem will cost you .hope you have already have it remedied.

Nov 14, 2006 | Toshiba 36A40 36" TV

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