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Re: Panasonic TH-50PZ77U 1 1/4" inch vertical line
Once you open up the unit, you should see a series of flat orage cables coming from the panel itself. These are the cables that can have poor connections. CAREFULLY remove them by releasing the connector "lock" and reseat them inside the connector. Re-lock the connector and try the set. If that fails, you should have the set examined as specialized equipment will be necessary to trace this problem.
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Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent. Line faults to all LCD screen are similar, irrespective of its brand and screen size.
Try reseating your Ribbon cables on timing control module it is usually right in the center at the top or bottom of tv and has a Metal shield over it Reseat the Cable from main board and the two cables going to buffer board
Tconn connections most likely. The thin ribbon connectors that go from the top of the T con up to the Drve board in the LCD panels Frame are the usual ones . Un ock them reseat and then lock them and it should solve the issue for you.
A line especially if black can be one of several things:
A communication problem between the main board that controls the panel
A bad board that drives that area of the panel
The worst possible cause is a defect INSIDE the front screen unit called a display panel----ribbon cables that are inside the panel where they cannot be got at can cause this and or a defect inside the Panel.
The wider the line the more likely you have a bad panel or connections inside it.
Trouble shooting would include checking all the ribbon cables coming out of the panel to make sure properly seated and or replacing the board/s that drive the panel.
80 percent chance it is the Panel itself--still have a 20 percent chance it is not(based on experience of dealing with this kind of issue in our shop).
These lines are possibly cause by a failing inverter cables from the graphics device transferring the signal to the LCD panel. Apparently, no easy fix for this unless you can reseat the inverter cables and if it won't work consider replacing them. But, the best thing to do about it is to contact your manufacturer and seek professional assistance to avoid tampering.
All plasma an LCD ts have boards that control vertical and horizontal output to their respective areas. They are connected to the screen by ribbon cables. If one of these boards fails all together, has a failed chip, a bad connection, or a bad ground somewhere it will result in a black line in the area of that board. A bad ribbon cable connection on the bottom will result in a vertical black bar though the screen. Many times resetting the connection will fix it, if the ribbon cable has been nicked there could be a severed connection. They an sometimes be fixed, but it is a pain. An yes I have done it, but the bar is gone. The same will happen if the chip that outputs to that area opens. The connectors are the first place to look paying close attention to the cable, they are extremely delicate so great care must be taken if you decide to tinker with em, the usually have lift locks that release them, but it is very easy to wreck em.
There is nothing special about changing a screen other that realizing that it is extremely fragile. You will likely have to remove all of the electronics boards and most of the frame. The panel will be attached to the front bezel with a number of screws. The flat ribbon cables that come from the panel are the most fragile part other than the panel glass itself. Extreme caution must be used when removing these cables from the connectors. These cables can tear easily. Once torn, the panel itself is useless. Once you get the replacement panel, please update this if you have specific questions. I would also suggest that you use a Sharie to mark the cables and corresponding connectors. While connected, mark one or more stripes on the pairs so that they will be easier to match up later.
Multiple stripes all over the screen? Vertical or horizontal?
If it's only like an inch vertical lines put a mark on the cabinet where exaclty the line is, turn off the TV then open the back, you'll see lots of ribbon wires (gold color) from the plasma panel it self going to buffer boards, using the mark find the closest ribbon wire where the line is showing then remove and clean the contacts, make sure to reseat it properly when putting it back otherwise you'll just add more lines or black bar on the screen if pins are not seating properly.
But do not be afraid if the lines get worst just turn the power off right away and reaset the ribbon wire till you get it correctly.
DO NOT try to do this while the TV is on oherwise you'll burn COF (Chip on film) on the panel and you'll end up replacing the whole PDP.