How to check standby voltage on power supply - troubleshooting help
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The troubleshooting in this video will apply to a TV that will not power on. So, if your TV will not turn on, either with the remote or by pushing the power button on it, try these troubleshooting steps.
In these troubleshooting steps, we will use a multimeter to check for certain voltages. In order to continue troubleshooting, be sure you have the proper training, experience, skills, and equipment necessary to use a multimeter to check voltages in a TV.
Try all repairs and troubleshooting at your own risk.
The first thing that I can do, is to check and see if there is a standby light in the front of the TV. Some TVs have the ability to show a standby light, while others do not. If I do see a standby light in the front of the TV, that shows that I do have some power going to the TV, but it will just not turn on. We will continue troubleshooting.
I have removed the back cover off the TV and I will use my meter to check the standby voltage on the power supply.
First identify the power supply in your TV. Then look for a cable that runs from the power supply to the main board.
The standby voltage for this power supply board and TV is 12 volts.
Some TVs will have the test points on the connection where the cable connects to the board. We have highlighted this test point in the video.
When I am testing the point, if I do have the 12 volt standby, then it shows that my power supply is most likely good and the main board should be replaced.
Now, I will show how to replace the main board.
Once again, I will disconnect all of the cables and then remove the board from the panel by unscrewing it.
Then attach your replacement board to the panel with the screws and reconnect all of the cables.
When I am testing the point, if I do not have the 12 volt standby, then it shows that my power supply is most likely not working correctly and it should be replaced. Here is a video showing how to replace the power supply board.
The first thing I will do is disconnect the cables from the board.
Next, I will remove the screws that hold the board to the TV panel.
After I have removed the screws, I can lift the board from the panel. Then I will take my replacement board and line it up correctly, and then screw it to the panel and secure it tightly.
Then, I can reconnect all of the cables.
This testing is a great place to start for troubleshooting these symptoms. In some rare cases, if you do have standby, and your TV will not power on, the problem could also be a component on the power supply board. However to start troubleshooting, it is recommended to replace the main board first.

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