Question about LG 47LN5400 47" LED TV 1920x1080, 120 Hz. HDTV

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LG 47LN5400 blank screen after brief flash

When I turn on my LG 47LN5400 LED TV, all I get is a very brief short flash and them no picture at all.

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  • LG Master
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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://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.

Posted on Dec 13, 2016

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Re5cue911
  • 94 Answers

SOURCE: AKAI PDP5006H Plasma tv

1) Is the TV plugged directly into an outlet or is it plugged into another device, such as a cable box or audio receiver? If it is, try plugging directly into a wall outlet. Sometimes, devices like cable boxes don't provide enough current to power on more powerful newer TVs (like Plasma, LCD, etc) .

2) Check the manual to see if the flashing LED is a code for something you need to troubleshoot. The number and color of flashes may correspond to a problem that may or may not be easily fixed.

Hope that helps. Let me know how you make out.

Posted on Jan 15, 2008

jerryg50
  • 1667 Answers

SOURCE: LG 36" LCD Flashing Picture

Most likely cause:
Backplane lamps, and or the backplane power supply is defective.

I don't know the particular model, but in most of these models, these parts are replacable. I suggest giving out the set to a tech who is experieced at doing this type of work. The parts would have to be ordered from the manufacture.

Jerry G.

Posted on Jul 01, 2008

jhinsincity
  • 616 Answers

SOURCE: Blue light blinking-

I would say you are lucky to get a pretty fair price, sounds like a convergence problem- if the tv is a projection wide screen. worth the investment Julio milleniumtvsvc@gmail.com

Posted on Jul 22, 2009

  • 5 Answers

SOURCE: Phillips Flat TV Model 20pf4121\105 (Flashing green led)

I had exactly the same problem When the TV was switched on all I could see was a flashing green light. After cheching the TV internals and not seeing a problem including the power supply unit which looked and checked normal. Here is what I did to get M TV working again.
Disconnect it from the power supply. Hold down all the buttons simultaneously i.e. the on/off, the volume, the programme, menu buttons, all of them simultaneously and Plug it into the power supply again.
Lo and behold My TV jumped back into life after an absence of about 4 weeks.
Try it yourself exactly as above.

Best of luck.

Irishfreethinker

Posted on Sep 22, 2009

  • 5 Answers

SOURCE: Philips 20PF4121 LCD tv no picture but flashing error codes

I had exactly the same problem When the TV was switched on all I could see was a flashing green light. After cheching the TV internals and not seeing a problem including the power supply unit which looked and checked normal. Here is what I did to get M TV working again.
Disconnect it from the power supply. Hold down all the buttons simultaneously i.e. the on/off, the volume, the programme, menu buttons, all of them simultaneously and Plug it into the power supply again.
Lo and behold My TV jumped back into life after an absence of about 4 weeks.
Try it yourself exactly as above.

Best of luck.

Irishfreethinker

Posted on Sep 23, 2009

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