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Samsung LCD TV LA40A650A1F Ghosting Repair
Firstly, let it be said that this is not a permanent fix. It is purely an opportunity to carry out a repair and keep an appliance away from recycling for a little longer.
A customer brought in a Samsung TV that would regularly experience ‘ghosting’, distorted picture or lines across the screen.
After checking the basics, I thought that the problem might be with the T-Con (Timing Control) board. However, after doing more research, I discovered a simple way to find out the origin of the fault. By selecting the menu feature and twisting the TV, the distortion will be shown either across the picture only or across the entire screen, including the menu.
If the picture is distorted across the picture, but not the menu, this indicates a Timing Control board fault. If however, the distortion occurs across the entire screen – the picture as well as the menu, this shows the fault is a connection onto the screen itself.
In this case, the lines carried right across the screen. You guessed it – a screen replacement was necessary! As the ribbon cable is adhered directly to the screen, this bad connection could only be truly repaired by replacement of the screen.
Unfortunately, most screen replacements far outweigh the price of another TV. But, I’m sure you, like me, hate to see any appliance with a chance of extended life thrown into recycling, even if it’s for a short time. After discussions with the customer, it was decided to give the repair a try.
The problem exists because where the flex ribbon is connected to the screen a poor connection is created by heat and vibration over time. The only true way to repair this is to replace the screen itself. But with a little ingenuity, a clear screen can once again be obtained. It all depends on the tension kept between the ribbon cable and the screen.
Believe it or not, this repair involves using a car tyre inner tube! By cutting the tube into little pads, these pieces can be placed between the ribbon cable and the screen frame, putting pressure on the connection and eliminating the distorted picture. In some cases, extra pads may need to be placed under the ribbon as well, sandwiching the ribbon between the 2 pads. This is where a little experimentation is required.
After reassembly and testing for 2 days, flexing the TV and screen, a clear picture remained. Obviously, at some time in the future, the customer will have to decide to either purchase a new screen or new TV. But for now, at least this TV has been rescued from recycling for a little longer!
If you are interested in a video of this repair, please follow the link below
This article was prepared for you by Mark Rabone from Australia.
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Note: You can check out his previous repair article below: