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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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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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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

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SOURCE: 924x

having the same exact started with the green led power light flickering and it would take a long time to come up and then it got progressively 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

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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 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

Posted on Sep 23, 2009

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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.
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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.

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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.

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