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How do I check the led light strips on my led lcd tv, to see if they work? and/or how do I replace the led light strips?

When i plug tv to wall outlet, red light{power light in front of tv}turns on. Then, when i turn tv on, red light turns off and ONLY the left-half side of the screen flashes once{screen stays black} and power light also flashes once GREEN-as if it wants to turn on, but nothing comes on. I was told it might be the power supply board and i replaced it with new one. But it still does the same thing. when I disconnect power cable from wall, I hear small static noise coming from speaker.

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  • RCA Master
  • 76,237 Answers

Contact any service technician. It will be best in this case. If you're sound in electronics, and have some previous knowledge in servicing LCD TVs; please respond. Otherwise please !!!!!!!!. Time is precious for us.

Posted on Jan 19, 2015


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Posted on Jan 02, 2017


Sonny Berry

  • 8617 Answers

SOURCE: power up problem

i will need the model number of your set in order to help you with your problem. Please post the model number and I will try to help you out with the problem.

Posted on May 07, 2008


  • 52 Answers

SOURCE: TV does not turn on/red led flashes 7 times in front

this is common issue with this model and through your troubleshooting is tied to y main board. blinking led on logic main in normal operation. when replacing y main always good idea to replace y upper and lowe buffer boards as they complete a circuit and sometimes replacing one without other could cause additional failure on remaining boards

Posted on Aug 19, 2008


Todd Thornton

  • 101 Answers

SOURCE: protron lcd tv getting no power

Replace the power supply inside the tv. I have found ther here. They are the cheepest place that has them.$60 not $100 at shop jimmy.

Posted on Aug 30, 2009


  • 1 Answer

SOURCE: Insignia LCD TV 32 inch will not come on

I received no replies to my request. I guest I stumped 2 million techs. I'll just buy a new TV with a 5 yr warranty. No thanks to joining your service, I can do bad all by myself.

Posted on Feb 09, 2010


Sanyade Akinwale

  • 1099 Answers

SOURCE: Plasma Television won't turn on


A common problem for these is bad capacitors in the power supply, Remove the back from your Tv and look at the power supply on the left hand side.

You will see roughly around 9 x capacitors that are bulged / domed shaped on top usually these are valued at 3300uf 10V any that have bulged or leaked a brown like substance should be changed.
This will cure the problem as they overheat being sat next to a heatsink that gets very hot!
Try and change them for the same 3300uf but a higher voltage.

if otherwise the power supply board is faulty you can try websites, to buy a refurbish power supply board for the replacement.

Hope this helps

Posted on Jul 02, 2010

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My TV is Sinotec LED 43 inch HS-2110H-00

The most common problem with backlights in an LED TV set is a failed LED. While these are supposed to last 30,000 - 50,000 hours, they are very sensitive to static electricity damage. This does not show up immediately, but after some time, the LED may flicker, then burn out, or burn out suddenly.

On many LED TV models, the backlight will come on, then turn off if one of the LED strips is bad. Test procedure: unplug the TV set, wait 10 seconds, then plug it back in (or turn off the power strip for 10 seconds if you have the TV plugged into a power strip). Darken the room, then turn on the TV while watching the screen carefully. If you see a horizontal section of the TV that is darker than the rest of the screen before the screen goes completely dark, that is where the bad LED strip is.

If none of the LEDs light up, even briefly, the problem may be a bad LED driver circuit. This is often part of the power supply board, but may be a separate board. The LED driver board is identifiable by being connected to a cable of three or more single wires (not twisted pairs or flat ribbon) going into the metal back pan of the TV, generally to the upper left side (viewed from the back). If the driver is separate from the power supply board, it will have another cable going to the power supply board..

Repairing a bad LED is labor-intensive.
1. Disconnect the TV from everything and remove the back cover. (at this point, you can plug in the set and repeat the LED test, and watch the various holes in the metal back pan to see if the LEDs flash when you turn on the set. Be very careful - there are exposed high voltage connections on the power supply board when the TV is plugged in, even if the set is off.
2. Make sure the TV is unplugged. Remove the shield from the T-Con board (at the top or bottom of the TV, centered horizontally).
3. Unlatch the flat cable connectors between the T-Con board and the edge of the LCD display.
4. Treat a section of clean carpet or large beach towel with anti-static spray, then lay it on a flat surface (make sure there are no foreign objects in this area; you don't want anything punching into the LCD). Lay the TV face down on this mat.
5. Remove the stand if it is still attached.
6. Remove all of the screws from the perimeter of the LCD. At this point, it is very desirable to have a helper. Lift the TV upright, holding it by both the front bezel and the metal back pan. Remove the front bezel (on most models it is held on by plastic tabs with hooks as well as some of the screws that were just removed).
7. Check for another set of screws that hold a rectangular steel frame or set of steel strips to the edge of the screen. Lay the TV flat again and remove these.
8. Very carefully unfold the connector strip(s) with the T-Con cables from the frame and lay them flat on the mat. Avoid any stress on the ribbons between the strips and LCD glass; if you tear or pull loose any of them, the display is ruined. Avoid touching any of the metal circuit tracing on the strips or the bare metal on the ends of the T-Con cables - static electricity discharge may damage the display.
9. Gently lift the back part of the TV (the metal pan with the circuit boards attached) off of the display. Two people are recommended for this task, especially for larger sets. On some models, it may be more workable to remove the LCD and diffuser sheets one part at a time while the TV is held upright. Make sure to keep all of the layers in the proper order, including front-side alignment, and put them on a clean lint-free surface.
10. There may be a white plastic reflector pan covering the LED strips in the back pan. The plastic is typically very thin and delicate. Carefully remove it.
11. Now you should have the LED strips exposed. At this point, you can plug in the TV and turn it on while watching the LED strips. (Caution: there are exposed high voltages on the back of the TV. Do not touch the power supply board while the TV is plugged in!) You will see the good LED strips flash while one or two strips remain dark. The bad LED is on one of the dark strips.

At this point, you have several options: 1. Replace the entire set of LED strips. If one LED has been abused (excess current or static electricity), chances are others in the set are also damaged. 2. Replace just the failed strip(s); 3. Identify and replace the bad LED; or. 4. Replace all of the LEDs in the bad strip(s). The strips are usually held in place by double-sided tape or a tacky adhesive. LED replacement requires tools for soldering surface-mount devices. If there is a circular piece of white plastic tape around the LED, carefully peel it off and save it, and likewise pull off the lens that is glued on over the LED before attempting to remove the LED.

White LEDs are blue LEDs with yellow phosphor painted on top. Blue LEDs are more vulnerable to static damage than other colors due to their strained-crystal construction. Consequently, parts with blue or white LEDs should not be handled unless electrostatic discharge safety measures are practiced.

Sep 28, 2018 | Televison & Video


TV led back-light repair

Tv using power supply unit EAY62810301.

No back-light/sound ok.

No dc voltage measured at P801 led plug.
New board did not fix.
Remove display panel.
With face up, panel will hinge up. (after removing all trim parts) Place folded towels beneath, to prevent strain on tcon ribbon.
Fold other screens up and over on top of display to keep them in right order. Including white background reflector.
Check each series led string with 2*9V batteries and series resistor, minding marked polarity.
Circuit consists of 3 strips of 7 leds all in series.
One bad led disables all .
Check each led of bad string. I used 18V and 1K ohm.
Replace strip or jumper (short) bad led. I just jumpered the bad one that was on edge of panel. (first in string).



on Mar 28, 2015 | LG 32LN530B 32" 720p LED-LCD TV - 16:9 -...

2 Answers

Hello, I have an LG 47LV5400 LCD TV. TV goes on fine but then the screen goes black after 15 to 45 minutes.

Hello... You have LEDs in the backlighting circuit going bad. If you can find a service center that does LED strip replacement, it might be repairable. If you attempt to repair it yourself, you risk damaging the LCD screen, as they are very fragile. I hope this helps!

Nov 26, 2017 | LG Televison & Video

3 Answers

I have an LG 47LN522-UB LED TV that stopped working after three years and need help diagnosing a problem with it.

Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Apr 26, 2017 | LG Televison & Video

1 Answer

How do i fix a samsung lcd led tv burned out led backlights?

hi if its led backlit then there are strips of leds mounted within the screen assembly....each strip plugs in and you can test each strip by connecting 15-20v across each strip to see which does not light up...then replace that strip

Dec 30, 2015 | Samsung Televison & Video

1 Answer

Sony KDL 46HX820 turns on, then off and red light blinks four times.

Re: Bravia KDL46EX720. Red LED blinks 4 times and TV wont turn on. What is the problem?

Do a Power Reset.

1. Turn off the TV.
2. Unplug the power cord of the TV from the electrical outlet.
3. Let the TV remain without power for 60 seconds.
4. Plug the power cord back into the electrical outlet. (If the television is plugged into a power strip or surge protector, remove it from the power strip or surge protector and plug it directly into the wall outlet. If the issue is resolved, the problem is with the power strip or surge protector and not the television.)
5. Turn on the TV.

If the issue still persists after performing power reset, that may be an indication that the TV needs service. You may refer to this link to locate the nearest Sony authorized service center in your area.

Oct 21, 2014 | Sony KDL-46HX820 - 46" BRAVIA 1080p LED...

2 Answers

TV no longer power's on. What problem is causing this condition?

If the TV AND the DVD player are not powering on, then it sounds like the problem is at the receptacle or power strip, where the TV and the DVD player are plugged in. Make sure the receptacle or power strip is working. Plug something else in, a lamp, a radio, anything, and see if it works. If it doesn't then the power strip is off or not working or the wall receptacle is not working.

May 25, 2014 | Coby TVDVD2050 20 in. TV/DVD Combo

1 Answer

The on/off light on the bottom middle screen is blinking one solid time and then one fast time. The tv wont come on with the panel or remote.



1)Plug in TV to electric current First then wait until LED start flashing.
2)Press Volume DOWN HOLD ALL three buttons until LED stops flashing and then release.

·This will reset the TV in order to fix the problem.
·THE FIX IS TO REPLACE ONE OF THE LED's. You need to open the back of the TV and you will also need to remove the front cover and panel to get to the LEDs. The TV will need to be placed facedown and on the backside. This is a 2 person job to turn the TV on its sides. Be careful with the white computer connectors (wide white strip) at the base of the TV where the TV stand sits. You will need to disconnect this in order to get to the LED's.
Once you have the LED's exposed, you will need to unplug one by one by placing the new strip next to it until the unit turns on. You will have to use the RESET procedure above if the Power lite flashes. The Power lite MUST BE ON SOLID - no blinking in order to test the strips. The LED's will flash, but still one of them will be burned. Even if you stare and all the strip light-up, you will still need to check one-by-one!
Once the TV lights up, your face will also light up with joy! Put everything back together and you are set. If you need the complete instructions which come from Sharp as to how to disassemble the unit, please send me an e-mail to LGTR61@YAHOO.ES. Please note I don't check this address daily, so a few days wait may take for you to receive the instructions.

Where can you buy the LED's - try searching
Sharp LCD/LED parts web site -
Copy this link:,_X4 or for resellers.

RL 94v-0
1025 LFa

Dec 27, 2012 | Sharp LC60LE810UN 60 in. LCD TV

3 Answers

60' Sharp Aquos tv power bar flashing but TV wont turn on. Any help??

Good day!!!

please try to count the exact number of blinking lights to diagnose where the fault came from..

Also try to open the cover and look for any bulged capacitors on power supply board..

Dec 04, 2011 | Sharp LC60LE810UN 60 in. LCD TV

1 Answer

No Power - Viewsonic N3252w LCD TV

you go to a service centre near your area who repear it

Sep 08, 2009 | ViewSonic N3252w 32 in. LCD Television

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