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Lg led tv 50uh5500. when turned on there is a quick flash of the LG logo then screen is black. no audio either.

The power supply board showed 3 supplies all 13.2v going to the mains bd. I only measure 10 volts at 2 of these and 0 volts at the third. that is with the cable to main bd disconnected or connected. so if the bd is right should be 13.2 I would think power supply bad. also disconnected the wires from the power supply to led's and same thing

Posted by Jim Oliver on

5 Related Answers


Joe Stanch

  • 755 Answers

SOURCE: I have a LG 42LE5300 Led tv when I turn the tv on

if you are getting the logo and snow , I think you are on the wrong channel for programming

Posted on Dec 02, 2014


EMCS Engineers

  • 78 Answers

SOURCE: Tv cycles on to LG logo and back off continually when plugged in.

bad power board

Posted on Dec 11, 2015

Testimonial: "Ordered a complete set( main,power and logic board) for just about $30 dollars more than just power board. Waiting for it to arrive to see which component is bad. Will inform @ later time"


Olga Stanko

  • 7 Answers

SOURCE: No back-light on LG LED TV

That means dead transformer supply chain. Replacing search not possible, donor Yes

Posted on Aug 08, 2016


Electro Med Services

  • 6694 Answers

SOURCE: LG LED TV. 50LN5700UH. Picture out. It will flash LG Logo on power up then go black. Image is present by flashlight test. Audio is also present. Power LED is also lit.

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.
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 Jan 02, 2017



  • 85241 Answers

SOURCE: Can you help to order ? for my lg tv have a problem when turn on it work about 4 minute the picture flash ,and no picture, I hear only the sound ,

without testing then you might as well replace them all.

Posted on Mar 24, 2017

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Related Questions:


Model 50uh5500 4k smart TV. Why doesn't it turn on?

1. Open internal fuse
2. Power supply failure

Will LED power supply fix my black screen on TV?

Chances are you have bad lamps in the will need to take the front cover off and get under the panel and test them and see if some are bad, if they are replace the strip...good luck as its not all that easy to get the panel off and back on without damaging it, use extreme care handling it or once you get the lamps working the panel can be damaged and then it has to be recycled as it can't be fixed

LG 50ln5750 Led Smart Tv has audio but quickly flashes logo with power on, then black. Passes flashlight test, can see the menu. Which part do I need to get it going?

Chances are you have some shorted LED's inside the panel and its drawing to much current and shutting the supply voltage off

Lg tv blink codes

Take the screen off connect power and watch LEDs if any don't flash its LEDs only needed to change faulty strip if they all flash its probably t con boards.

Can someone point me at the blink codes matrix for this LG line?

Check out the inverter board that powers the back light leds.
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