Samsung UN46FH6030FXZA LED TV No Backlights Voltage Test Troubleshoot LEDs & Power Supply

Voltage testing to help find problem for BN44-00564C power supply for No Backlights
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Be sure to match your Panel number and power supply part number.

In this video we will show how to troubleshoot if you have the symptom of no image or a blank screen, but you can see an image on the screen with a flashlight and you do have audio.
This video applies to the following power supply/LED board part number. BN44-00564C for Samsung TV model number, UN46FH6030FXZA US02 and panel number CY-DF460CSLV1H
LEDs are panel specific, so you must match the panel sticker number to be sure you have the correct replacement LEDs.
In this video the test that we are showing is checking the voltages. Testing the voltages will help to determine if the backlighting problem is being caused by the power supply/LED board or the actual LEDs themselves.
If you have not run the flashlight/backlight test, please click the link in the video to the flashlight test.
If there is not a link to click, please go to our channel and find the flashlight test video. After running the flashlight test, if you determine that you do have an image on the screen, while using a flashlight, and you have audio, but no backlights, continue this troubleshooting video.
In order to continue troubleshooting, you will need to have the skills, experience, and tools necessary to check voltages on the power supply/LED board. It is necessary that you take the proper precautions to protect yourself, as checking voltages can be dangerous on a TV that is powered on.
I have begun by removing the screws and the back cover off my TV. We will be running the test on the power supply/LED board here on the panel.
We have higlighted this board in the video.
As we take a closer look at the power supply/LED board, here is the cable connection that runs from the power supply to the LEDs.
I will be checking the voltages at this connection.
We have four different sections of LED strips in this TV, thus we have 4 test points to check for the appropriate voltages.
These points are labeled as M1+, M2+, M3+, and M4+.
Before I begin testing the points, I will plug in my TV and either on the keypad controller or using the remote, I will power on the TV.
I will start with M1+. It shows about 40 volts. Which is good.
I will then test the remaining 3 test points to check and see if they are good.
All of the test points are showing normal operating voltages.
Before I begin testing the points, I will plugin my TV and either on the keypad controller or using the remote, I will power on the TV.
If the voltages were at zero or lower than our normal numbers, that would show that there could be a problem with the power supply board.
I would want to first unplug the TV and then disconnect the LED cable and retest the points.
We get a reading higher than normal which shows that the power supply is working and there is a problem with the LEDs.
If we were getting a lower than normal reading or zeros, than the problem would be the power supply.
Before I begin testing the points, I will plug in my TV and either on the keypad controller or using the remote, I will power on the TV.
If the voltages show much higher than our normal numbers, then you most likely have a problem with the LED strips.
Before replacing the LED strips, you will want to disconnect the LED cable and retest. I would want to first unplug the TV and then disconnect the LED cable and retest the points.
We get a reading higher than normal which shows that the power supply is working and there is a problem with the LEDs.
If we were getting a lower than normal reading, or zeroes, then the problem would be the power supply.
If you decide to replace the LEDs in your TV, here are a few recommendations, it is recommended that the replacement be done by a trained professional as during the replacement process, there is a chance you could damage the TV panel. If you damage your TV panel, It is not fixable and your TV will no longer operate as normal.
Always replace all of the LED strips in your TV at the same time. If one of them has shorted out, there is a high likely hood of another having the same problem.
When searching for replacement LED strips, be sure to find the panel information for your TV and search using that information.
Panel info can be located on a sticker on the panel or sometimes on a buffer board on the TV.
LED strips are panel specific and not model specific.


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