My TV keeps turning on and off repeatedly on it's own. It used to do this a few times and would eventually start up, but now it won't ever start up. When I unplug the cord connecting the power supply board to the main board, the tv backlights stay on without turning off. However, when connected, they turn on and off. I replaced the power supply board with a new power supply board and had the same issue. Does this indicate the issue is with the main board?
What's the model of your TV? Without that it's hard to give any helpfull information on fixing your set
It is a Samsung Unh6350
That helps a lot, this set has a tcon board, start by unhooking the LVDS cable, the one going from the main to tcon board, if you're able to turn the set on and it stays on replace the tcon board, naturally you won't have a picture but the set should stay on of it's the tcon causing the issue, if it still shuts off remove the flat ribbon connectors going from tcon to main, if the set stays on then its the panel that's bad, generally the DC to DC converter gives issues, the IC is located on the panel board but replacing it is very hard to do without the proper equipment. Hope this helps.
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Based on the symptoms you described, it sounds like there may be an issue with either the power supply board or the main board of your Samsung LCD TV. The fact that the TV keeps turning on and off repeatedly on its own, and now it won't start up at all, suggests that there may be a problem with one of these components.
When you unplug the cord connecting the power supply board to the main board, and the TV backlights stay on without turning off, it indicates that the power supply board is working properly. However, when connected to the main board, the backlight turns on and off, which suggests that the issue is with the main board.
It's possible that the main board is malfunctioning and not providing the correct signals to the power supply board, which is causing the backlight to turn on and off. Replacing the power supply board with a new one and still experiencing the same issue, confirms that the problem is not with the power supply board.
It's important to diagnose the problem correctly and not just replace parts without properly testing them, as this can lead to wasted time and money. A proper diagnosis can be made by a technician with a scanner that can read the codes and check the signals of the main board and power supply board.
It's also a good idea to check all cables, connectors, and other electronic parts of the TV, as any damaged or loose parts can cause the problem as well.
It's recommended to check the TV's warranty status and the manufacturer's instructions to ensure that the repair or replacement will not void the warranty. If the TV is out of warranty, it might be more cost-effective to consider purchasing a new TV, as repairing an older model might not be cost-effective.
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It is a Samsung Un60h6350
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