TV Will Not Turn On Troubleshooting Help - LED, LCD & Plasma TV Troubleshooting TV Will Not Power On

How to test for standby voltage to determine if the problem is the power supply or main board.

In this video we will show troubleshooting steps that will work for a plasma TV, LCD TV & LED TV. 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.
Here we have an LED TV that will not turn on. 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 of 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.
Then you can look to see if the board has a legend on it, showing which pins show what voltages.
You will want to look for the one that shows the 5 volt standby. All boards are different, some will have a legend, some will not. Some will have the pin labeled and some won't. If your board does show what pin has 5 volt standby, then check that pin. If it does not show which one if the 5 volt standby, then you will want to check all of the pins on the cable, one at a time and look for one of them to show as 5 volts. As you can see, both pins 1 and 2 show our 5 volt standby. I will check pin 1. Be sure your TV is plugged in. After you check the pins, if you do have 5 volt standby, but your TV is not powering on, then I recommend replacing the main board.
If you do not have 5 volt standby, then you are not getting power from the power supply board. Assuming your outlet works, and the TV is plugged in correctly, I recommend replacing the power supply board.
A quick recap of our first step for troubleshooting the symptom of if your TV will not power on. If you check the 5 volt standby on the power supply, and your meter shows 5 volts, then your power supply is working, but the main board is not turning on the TV. So, I recommend replacing the main board. If you check for the 5 volt standby, and you do not receive 5 volts on your meter, then your TV is not receiving power and I recommend replacing the power supply.
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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TV Repair Made Easy™

[doctortony]

Thank you so much for this educational video!!! By your multimeter test I needed a power supply board. Unfortunately the power supply board I needed wasn’t in stock on your website but I did find one on eBay and now my TV works again! No TV repairman costs at all since I was able to diagnose and fix myself. I’m in a debt of gratitude and will refer everyone possible to your website, videos, products...etc. Thanks!

[andrew_koala]

What is a Multeye Meter ?
And what has the eye have to do with it ?

[EricWebSurfer]

My Vizio LCD sometimes won’t power on. If I unplug and plug it back in, it will work for a while. Occasionally, it’ll turn off by itself while I watch, and I can usually just turn it back on. Also, if I haven’t used it for a few days, it sometimes won’t turn on. Unplug/replug seems to fix it as I described above. Power board failing?

[felixsantosmolina]

Hi, I have a Phhillips model- 24PFL3603/F7 the only thing that turns on is the Optical cable light, any idea what it could be.I changed the board and all the same. Would appreciate any help, thanks.

[flaboy]

I have a Toshiba 40e210u1had this problem....after watching your video i figured out that I did have the 5v standby on the power supply so I replaced the main board as suggested. The Tv is now working again, thanks shop jimmy!

[celestialdream]

Dumb question... where do I put the negative lead ? Any metal surface? Or is there somewhere on the board that has the negative lead? Thanks

[davevallee]

Hi Jim, thank you very much for your video. I have a Sony Bravia 60" kd-60x690e TV that is five years old today. It turned itself off, and will not turn back on. No lights, nothing.

There was no surge. I removed the plug from the surge protector, and plugged it into the UPS, no change. I plugged it into the wall outlet, no change. I'm guessing a power supply board.
When I watched your video, I could not tell where you grounded the other probe. Obviously, touching one probe to a connection, and leaving the other one dangling will not complete a circuit for electricity to flow. Where did you ground the other probe?

Thanks.

[anthonycarter]

When I use my tester on my supply board to check for power served in chrome, iTouch TV turns on

[Catshreyacatee]

Wow. Dat was epic. Da best repair is to replace da faulty part. Almost like replacing a flat tyre. Congrats man.

[Berkner]

What if your getting 3V with PS-ON? I do not see 5V stand by but all other volts on PS going to main board check out.

[bikez]

Hello Jimmy. Great video! I have a lg 55ln510, #310rmhr7b601 that will show picture for 30 sec and then the screen goes black. The standby light is on when tv is plugged in. I have checked the standby signal from pwr supply to main brd and get the listed value of 3.5V but I get a 0 for the 12v and the 24v pins. The pins for the wire going from pwr supply to led (+/- +/-) started at approx 13v and quickly dropped to 0 when tv plugged in but not turned on. No visible blown capacitors. Any suggestions would be appreciated. Thanks!

[jenniferandshaunwilliamson]

I bought the repair kit from you guys for the dps-162kp a power supply im wondering if you have a tutorial for testing and replacing each component in the kit.

[kimantka]

Hi Jim love the video troubleshooting, I have a 40 inch pioneer plasma t.v it'll play for about a week than it goes out for about a week than it'll play again what could be the problem. Thank you

[stuntcatproductions]

I ordered a replacement power board for a TCL 55s401 (2 years old) because I had no backlights. Flashlight test confirmed there was a display. I installed the new board from ShopJimmy and I get no response at all; not even a standby light as I did with the old board. Thanks for any help.

[madisonventurini]

Hello, what type of mutimeter are you using to check the power supply board?

[stanzie]

I have a TCL 49S403. Do you know which pin is the standby or should I just check each pin?

[IAGIC]

I don't get where the ground lead on the multimeter is supposed to touch

[ianjones]

Hi, I have a 32" Phillips flat screen T.V. - Model no. 32PFL5522D / 05 . All was fine until a few days ago when I went to turn it on via the remote and nothing happened. The standby light has never come back on when plugging into the power supply. Have tried all the usual tricks by checking the fuse in the plug, plugging T.V. into another socket in another room - no joy. I am about to take off the back of the T.V. and go through the steps as advised on your youtube commentary. It makes sense to do what you advise about checking the standby voltage etc. Just thought I would post this prior to starting the checking procedure in case anyone has any other types of advice before I start.

Thanking you in anticipation

Ian J.

[davevallee]

Follow up - I left it unplugged over night, and it is now working. Yeah! Any thoughts on why it would have done that? Is a major failure imminent? Thanks.

[mohanp]

Hello,


I like your service and commitment to help / guide the community to repair the TV.


I have a Sony TV - model KDL52XBR9. It has a blank screen - no video or audio or backlight. When I turn ON with Remote or Power button on the TV, just the Green Standby light comes on.
If I disconnect and connect the wall plug, I hear some rely clicking and the backlight comes on for about 45 sec and backlight turns off by it self. Green standby light remains ON till I power OFF.


Can you please help diagnose the issue?


Thanks, Mohan