Model - Bush 2137T 21"
The problem has been deteriorating gradually and now the TV screen is only displaying a horizontal 1" picture. The sound is still ok and the channels are still working. Any comments please. Thank you in advance.
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Dec 30, 2013 - Uploaded by Pet Rock's Garage
This video covers how to fix a Panasonic 42" Plasma TV model TH-42PX600U that has vertical distorted ...
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.
There are two possibilities for this fault. If COF module has any loose contact, or, display itself. If you wish to get more details about these type of fault to Plasma display, check the link given here. It has screen-shots of defective plasma dislay. Compare them to that of your TVs' and make sure. http://electronicshelponline.blogspot.com/ View it in Timslide option.
I found the user manual online, and the pictures in it are really helpful and make this make a lot more sense, but: 1. Press [SCREEN MODE], to switch the TV aspect ratio. 2. Press [SCREEN MODE] repeatedly until the normal screen displays. NOTE: • Some programs may not offer all display mode options. 4:3 Programming [Sidebar] Sidebar displays a 4:3 picture at its standard 4:3 size. Sidebars will be displayed on the right and left edges of the screen. [Full] Full displays a 4:3 picture at a 16:9 size, with horizontal elongation necessary to fill the screen. [Cinema] Cinema displays a 4:3 picture at a 16:9 size, with less horizontal elongation necessary to fill the screen because a little bit of the top and bottom edge of the screen will be cut off. [Wide] Wide displays the center of the picture as original size and the outer sides of the picture will be elongated. The size of the picture will depend on the original signal. 16:9 Programming [Full] A picture is displayed at 16:9 size as it is. [Zoom] Zoom displays a 16:9 picture without changing its horizontal and vertical ratio, at its maximum size. [Cinema] Cinema displays a 16:9 picture with vertical elongation. [Expand] Expand displays a 16:9 picture with horizontal elongation
Power light is there, and sound is OK, indicates the faut is with the horizontal output section. Check all the components in the horizontal output circuit. Line output transormer should be suspected. Image of the suspected components attached.
This is a problem with the vertical circuit. Look for a small flat IC attached to a heatsink that will be marked LA7837 or something similar. It should have about 11 pins. Try resoldering the pins on that IC first. If that does not resolve the problem, replace the IC. There may be capacitors that require replacement in that circuit as well.