Question about Zenith C27A25 27" TV

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I have panasonic tv model TC-21FX20RG has insufficent vertical height.It shows picture/rastar enclosed between two sinusoidal horizontal lines that cover only 1/4 of the screen to the centre.

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Deflection circuit problem. Check the video IC.

Posted on Sep 04, 2010

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1 Answer

My panasonic plasma started showing vertical lines


Look at the buffer board or the Y sustain board on a plasma having picture aberrations.

Sep 16, 2016 | Panasonic Viera 50" Class 1080p Full HD 3D...

1 Answer

Why I have a thin line across the screen in my TV model Panasonic TC 21. After replacing the vertical IC the horizontal line across the screen reduced to few inches and not as it was earlier. vertica


First, You should to replace by original part, then you should check the voltages on power supply, and check the voltage for vertical IC based on datasheet, also check the voltages on vertical section including yoke and last you should check the ESR capacitors on vertical section.

Oct 13, 2014 | Panasonic TC-21PM10RQ 21" TV

1 Answer

Circuit diagram TC-29P20B


Vertical scan output section circuit fault. Horizontal line problem. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

Apr 29, 2014 | Panasonic TC-29P22R 29" TV

1 Answer

Horizontal Band of Thin Red and Blue Lines on Screen


Sound like your Y-Sustain board has one foot in the grave. The Y upper buffer and Y lower buffer boards go when the Y Sus Goes too...

Mar 22, 2014 | Panasonic TCP46C2 46 in Plasma TV

1 Answer

Horizontal lines across TV screen Pansonic CT 35g25


Check its vertical output section circuit for any component damage or loose soldering terminals. Check the solder terminals of the vertical output IC. Resolder all the suspected solder terminals by applying al little more fresh solder, without making any solder bridge short in between adjacent solder terminals.
If this do not help you, replace the vertical output IC. Lose of Vertical Scan is the problem of your TV.

Aug 04, 2012 | Panasonic CT-35G25 TV

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

1 Answer

Panasonic TC-P54S1 mounting hole pattern


See page 8 of the manual at: http://service.us.panasonic.com/OPERMANPDF/TCP42S1.PDF The bracket shown there looks like the mounting holes (4?) are vertical on the back of the TV. They may be identified by an arrow pointing to them. There will be two holes on each side of the TV centerline to attach the vertical components of the bracket that hang on the horizontal angle bars on the wall.

Oct 06, 2009 | Panasonic TC-P54S1 54 in. Plasma HDTV

1 Answer

Horizontal white lines across top of TV screen


Vertical hold circuit is failing.

Check capicitor in vertical hold circuit. You should have solid knowledge of electronics repair before attemping repair. TV's can emmit harmful radiation, and produce voltages up to or in excess of 30kV.

Oct 07, 2008 | Televison & Video

1 Answer

Black horizontal lines across bottom 1/3 of screen


This is due to vertical section failure. Change the vertical supply rectifier diode and supply filters. Then check zener diode leakage in pumpup circuit section. Also check any electrolytic capacitors leakage in vertical section. If it is old model tv change vertical height, vertical lenearity presets also. I hope given details useful to you.

Aug 23, 2007 | GE 27GT722 27" TV

1 Answer

Philips TV showing horizontal lines model 27pt6441/37


You likely have an elevtrlytic capacitor bad on the B+ line to the vertical ouput ic. If you continue to use the set like this it is likely the vertical ouput ic will fail.

Jun 26, 2007 | Philips 27PT6441 27" TV

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