As an example, if the error, like bars on the screen, is on the whole screen it's likely a faulty T-Con board. T-Con board errors tend to show up on the whole screen. Note that problems that show up on half of the screen like bars usually point to a failed main board. This check for the T-Con board also touches on the condition of the main board.
Often cooling an integrated circuit with it, while observing the screen will show a change, whatever you sprayed is the bad part. Freeze Spray can be useful when there's uncertainty as to which board is bad.If it is very high, that points to a main board problem.If the backlights came on in the previous step, this is just a double check.
Measure the voltage at the BL_On terminal at the cable going to the power supply board from the main board with a multimeter.Plug in the cable running between the power board and the Main Board, which was disconnected in the previous procedure.
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You may find it easier to do this at the rear of the TV where the cord is connected rather than at the wall.if a problem shows up on half the screen or only a portion, it is likely the main board, rather than the T-Con board. Now we check the main board to see if it is the culprit. Attempting repair instead of just throwing it out is a great way to go. If you aren't comfortable doing internal checks, you can have a technician check it out. Test leads with insulated clips on your multimeter will help greatly with this.Connect to the ground first, then with one hand check the high voltage connection, or measurement point.Use common sense and where possible use one hand at a time for measurements.Consider the following when taking voltage measurements: Remember that there are somewhat exposed high voltage areas on the power supply board.You are mainly looking for signs of failure on the boards and you will replace the board as a unit.Burned, overheated, or failed components can show up even more to the eye than the meter. You can still use your eyes even if you can't or don't want to use a multimeter. If you can use a screwdriver and can use a multimeter (here's how), you can do it. Now we move into the area where the back comes off, so to speak. If you don't see an image, you need to determine if your power supply is bad.Read the paragraphs below and determine if you want to try the fix. You can replace backlights with aftermarket parts that are available. The TV will likely not give blink codes or any other trouble signs. The generation of the image means everything else is working properly. If you do see an image this is a sign that the backlights have failed.Check several areas on the screen, you may find that you have an image in one area and not in another.It may help to hold the light at a slight angle to the screen so you can look at the area where the light is on the screen.In the area lit by the flashlight, see if you can see an image.Shine a bright flashlight at the screen.Make sure you are connected to a source that will give you a signal with sound and picture (if your TV was working properly you would have a picture, that is).This quick test will help you determine if the backlights on your TV have failed. you can check the cables for faults using this setting. Some newer models will have an HDMI test mode.Occasionally non-certified HDMI cables will cause problems in this way, it is best to use certified cables.It might also indicate a problem with a particular connected device if ''that device'' doesn't work in any port.
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If it doesn't, it could mean your HDMI port is bad or there is a major software glitch and a Factory Reset might be necessary.
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If this swap fixes a problem, then get a replacement cable and install it. Do this in turn for each source that you have. Use a known good cable and swap it with the cable from a particular source.Do this for every device that is connected to your TV. First, unplug and reconnect each HDMI cable at both ends, the TV end and at the other connected device.There are two main points of failure, the input sockets and the cables. The HDMI Inputs can have problems that will interrupt the video signal, while still allowing audio to function.
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