LG LED TV No Backlights – 32LN5300 32LN5310 32LN5700 – Voltage Test Troubleshoot LEDs & Power Supply



Voltage testing to help find problem for EAY62810301 power supply for No Backlights
Click Here for Replacement Parts:

Be sure to match your Panel number and power supply part number. LC320DUE-SFR1

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. EAY62810301 for LG TV model 32LN5300-UB.
For LG TV models, 32LN5300-UB, 32LN5310-UB, 32LN5700-UH and panel number LC320DUE-SFR1.
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 tests 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 highlighted 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.
Since this is a smaller TV, we will only have one test point at the connection, which is labeled LED plus.
Before I begin testing the points, I will plug in my TV and hit the power button on the side to turn it on.
I will measure the voltage at the test point and it shows 84 volts, which is good.
Before I begin testing the points, I will plug in my TV and hit the power button on the side to turn it on. If the voltages were at zero or lower that 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 then retest the point. So, unplug the TV, disconnect the LED cable, plug the TV back in and turn it on and then retest the point.
We get a reading higher than normal, which shows that the power supply is working and there is a problem with the LEDs.
When we were getting a lower than normal reading or zeros, then the problem would be the power supply.
Before I begin testing my points, I will plug in my TV and hit the power button on the side to turn it on.
If the voltages show as 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.
Once again, be sure to unplug the TV, then disconnect the LED cable, plug the TV back in, power it on and then retest the point.
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, 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 the 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, sometimes in the TV.
LED strips are panel specific and not model specific.
If you do need to replace the power supply board, be sure to find a replacement that matches your original part number on the board.
Be sure to unplug your TV.
You will need to start by removing all of the cables connected to the power supply.
Then remove all of the screws holding the board to the TV panel.
After removing the screws, you should be able to lift the board from the TV panel.
Then, put your replacement board on the panel and secure it using the screws and then reconnect all of the cables.

TV Repair Made Easy™
© 2015 ShopJimmy.com, LLC.

24 Replies to “LG LED TV No Backlights – 32LN5300 32LN5310 32LN5700 – Voltage Test Troubleshoot LEDs & Power Supply”

  1. Rwl Lew

    I have a sharp LC-60LE830u with no back lights but has an image using the flashlight test–the set also has sound. When I unplug the LED connection and test for voltage when I turn the TV on there is a quick voltage reading then nothing. The same thing happens when I isolate half the screen by unplugging the ribbon cable from the t-con board. Half the screen lights up for a second then goes black. There is two ribbon cables coming from the t-con board, and no matter which one I unplug the same thing happens: half the screen lights up for no more than a second then goes out. With both ribbon cables attached and and the LED connector disconnected at the power board, when I (force turn the TV on) I get a one second voltage reading then zero. Any help would be greatly appreciated.

  2. Alex Banaei

    Have a 55lv3700 led tv. I checked the led cable and read 55 volt dc. However, the screen is black no backlight and no sound. Power supply seems to be ok. Any idea what the reading voltage should be?

  3. XEDNIM Dan

    hi Everyone
    I have a question, Jimmy said about broken LEDs, power supply and other problems- how to identify and sort it. My TV went black screen with working audio, I could turn it off from remote control, back on (few red blinks on the bottom logo) and still black screen with working audio, I have unplugged tv for 10-15 sec and re-connected, screen started to work as normal. Another day similar story- while watching TV screen went black again but this time unplugging didn't help- I am wonder if this might be due to overheating some component on the power supply?
    I have removed power supply board to check for any visible damage to the parts- nothing, then when I assembled TV back to shape and plugged on it has started to work as normal (haven't run it for long due to late hours so can't tell how soon will go off again)- any advise on this one?

  4. Techno GB

    Hi, i have a 32" LG tv
    Model -32LN4900 backlight problem.
    Anyone can say me backlight lED's working voltage. or while testing power supply, what is the voltage outputs for led…

  5. aleon1018

    why no replies from ShopJimmy? I'd like to know if using a laser temp gun, so I can determine what parts on the board are or are not malfunctioning 😛 No obvious bulging caps.. and would like to know I could more easily repair these boards..

  6. Roger Beals

    I have a 32" RCA RLDED3258A-E and I called the local repair shop and was told that: because I have a sound and virtually no picture, that the backlights are probably gone and replacement parts for the backlights cannot be found. The TV was made in China and imported by Curtis International Ltd. and they do not supply replacement backlights. is there any other place that can supply the parts?

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