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If I replace the LED driver, do I also need to replace the back light strips?

I have an LG 42LN5400 tv by LG (Model 40IRMRH6P918). The audio remains on, but the visual is out. The monitor flashes briefly when turned on, but then no back lights. However, I can see tv images when I use a flash light on the screen.

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  • 181 Answers

Hello, those sets are notorious for the LED strips failing. I have replaced dozens of them. If your going to replace them, be sure you replace them all! Pat # is LC420DUE-SFR1 LED Strips. Thanks

Posted on Apr 28, 2017

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6ya6ya
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Posted on Jan 02, 2017

SOURCE: monitor screen blank and LED orange light flashing

I think you should try clean the cmos first... its not a monitor problem but for the system.

Posted on Aug 20, 2007

  • 3 Answers

SOURCE: 924x

having the same exact problem...it started with the green led power light flickering and it would take a long time to come up and then it got progressively worse...now the led light flickers red, yellow, green and the screen displays white lines randomly as the led light flickers...seriously doubt that the monitor is repairable....paid $500+ bucks for this sucker and have only had it for 1.5 years...have 3 CRT monitors that only cost $100 bucks from the mid 90's that are all still running strong (none are ViewSonic monitors), so needless to say we are very very disappointed in the QUALITY of ViewSonic Products. Our Company Will Avoid ViewSonic Porducts at all Costs in the Future!

Posted on Jan 03, 2008

  • 1 Answer

SOURCE: sharp aquos lc-37d43u tv

Same problem. TV worked night before and then would turn on but no picture or sound. Power and OPC lights blinking. I couldn't change the channel or get to the menu.
I disconnected the coaxial cable and the power for a few minutes and then plugged it back in (electric) but left the cable off. I got a message that it couldn;t get a signal. At that point I was able to change the channels. I plugged the cable line back in and everything worked fine... Good luck!!!

Posted on Jan 01, 2009

  • 1 Answer

SOURCE: my sony sxrd projection tv wont turn on

From what I've been able to find, the problem is the fan that cools the bulb is not starting when you turn the tv on. Blow on it to get it going or clean with compressed air. The fan could be clogged up with lint etc. It's on the rear left of the tv.

Posted on Sep 03, 2009

  • 152 Answers

SOURCE: Screen flashes - samsung 215tw LCD monitor

walkstex, I will answer the last ? first. All LCD monitors WILL NEED to have their "cold-cathode-fluorescent-tubes" replaced!!! As long as your display had a Bright, Crisp image displayed on it before this "FLASHING" symptom occured, then you don't need new CCF tubes. Your problem seems to be occuring in the electronic ballast circuit called an INVERTER. It Takes 12-15v DC and turns it into 800-1200v ac to light up the CCF tubes. This is the same technology used in the new style curlieQ screw-in light bulbs called CFL's. Only difference is they use what is known as a CONVERTER circuit----AC to AC!!!! And the tubes hung horizontally on the rear of your LCD panel are thin and straight. So, to answer your first ? Yes, it is an issue of getting the CCF tubes to light up. (backlighting) Now, I should also mention that there could possibly be a problem with the main power supply in the monitor. It is called a "switch-mode-power-supply" (smps) that supplies DC for the digital signal processing board (typ +5v) and 12-15v for the inverter. Well, This typical type of symptom could be as simple as a thermally fractured solder joint on the power supply board or some bad Filter capacitors could also need replacing. I suggest that you search web to find out more about the things I have mentioned in the above text. Do search for things like "swollen capacitors", "Bulging Capacitors" and checkout www.badcaps.net for some pictures of typical failures. Get back to me if you want to carry this any further on your own. Bye for now. I'm louie12fix on fixya or lmistyrel @aol.com

Posted on Sep 23, 2009

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What's wrong with my LG 55LV9500 LED TV? Power on, black screen.


Hello, either the power supply is failing to power up the LED's or the LED strips in the screen have failed, a common issue with these sets. Power supply part # is EAY62169701. LED strips are only available as a complete screen assembly from LG....thanks

Apr 23, 2017 | LG Televison & Video

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Problem in LG 42"led TV model 42LN5400,afterstart screen flashes every 5sec remain off. After running flash light test i found that there is display on TV and fine audio as well but no display at all.


Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://electro-medical.blogspot.com/
http://homenol.blogspot.com/
http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Apr 23, 2017 | LG Televison & Video

1 Answer

Ive got a LG 55" LED tv model #55LA6200 it will turn on and show the LG screen then goes black after a few seconds. Audio works and i can see the screen with flashlight which part do i need.


This could be the power supply at 55 dollars or the LED back light strips that are about 80. Unless you know how to test them, it is a toss up. Most of the time it is the led strips though. http://www.shopjimmy.com/lg/55la6200-ua

Feb 22, 2017 | LG Televison & Video

2 Answers

My lg tv model 47ln5200 has sound but no picture


Back - light problem. 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. http://electro-medical.blogspot.com/
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.

Feb 03, 2017 | LG Televison & Video

1 Answer

Have a lg 32ln3500 led tv, has audio, no backlight, & u can see screen when aiming a flashlight. According to videos on youtube it might be the led driver. Where is the led driver on this tv?


Back - light problem. 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. http://electro-medical.blogspot.com/
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....

Jan 04, 2017 | LG Televison & Video

1 Answer

LG 47LN5400-UA LED picture has gone out. Audio works. Using flashlight I can see faint menu image. LED Driver or LED Strips? How can I tell?


Back - light problem. 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. http://electro-medical.blogspot.com/ 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..

Dec 23, 2016 | LG 47LN5400 47" LED TV 1920x1080, 120 Hz....

1 Answer

LG LED TV screen goes black. LG - 55LN5710-UI


Back - light problem. 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.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
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.

May 16, 2016 | LG 55LN5710 55" LED TV 1920x1080, 120 Hz,...

1 Answer

My LG 42LN5400 LED TV turns off and on in an endless loop. There is some light on the screen when it comes on, but then goes black before turning off. What part needs to be replaced to fix this?


seems like the issue with the power circuit .. the LED must be fine that is why you see the back light when powering on ..

do not replace any parts manually, call in a technician, incorrect part can do more harm than good.

Jul 23, 2015 | LG 42" Ln5400 Series Led-Lcd Fu1080P...

4 Answers

LG 55LN5400 LED TV, back light failure, how can I fix?


Does the tv screen flash on and off very quickly? Does the led standby light come on and then slowly blink twice and go out?If these are the symptoms then it is more than likely a bad led backlight strip.I have answered this question in a previous post but to re-cap.I have a lg 47ln540v led tv and had this fault. In the previous post I explained that I had replaced all the boards,main,psu and t-con and all to no avail.I checked as best I could all the solder joints,resistors,fuses etc.I couldn't see any bad capacitors and I was on the verge of giving up.This was all a bit daunting since I am not a tv technican but I am familiar with electricity at a basic level.I decided this thing wasn't going to beat me so I decided to strip the tv screen assembly apart.I checked the led strips with a battery and found one led wasn't working.I managed to source a replacement led strip from a tv repair shop from a damaged tv and replaced it and this solved the problem. As I understand it,if the circuit component that monitors the backlight function detects a fault it shuts off the power to it and goes into a "safe mode",presumably to protect the remaining leds from receiving to much voltage or current since they are wired in series.Incidentally it took me five weeks to troubleshoot this fault.I cannot recommend anyone to do this themselves since there are capacitors on the power board that hold high voltage and charge and can be very dangerous,even lethal even when tv is switched off.I hope this is helpful to someone.

Mar 09, 2015 | LG Televison & Video

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