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The screen went dark on our year and a half old LG 50" flat screen. Sound works, can see screen when you shine a flash light on it. Replaced the power supply/LED board on it and it didn't fix it.

Service code: 50LN5100-UB.BUSYLJR, what part should I replace now?

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Posted on Jan 02, 2017

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SOURCE: 1 year ol 52 inch flat screen with new power supply cycling.

Still sounds like a power supply issue would it still be under repairers warranty

Posted on Jan 07, 2010

  • 15 Answers

SOURCE: toshiba tdp-s3 projector

It sounds like the high voltage portion of the power supply (ballast). Turn to the solder side of the P/S board and orient it so the silkscreen is legible. Check for burnt resistor R573, 2Kohm. It's center of board, 3/4" from bottom edge. If that's OK, check 3.3kohm resistors R621, 622, 625, 628, 629, and 630. They're in the top right corner. They tend to crack. Good luck.

Posted on Feb 20, 2010

  • 10594 Answers

SOURCE: what is the problem with

Did you replaced both back light inverter boards in your Dynex 37 inch tv?
What is model number of this tv?
Does power supply board provide correct voltages to back light inverter boards?
Let me know above info to diagnose problem.

Posted on Nov 12, 2010

  • 2432 Answers

SOURCE: lg 47lk520 reset

tried first to disconnect the supply connector going to the inverter board for back light just to ensure if their is no shorted component here. and then turn the power on again if the light stay then the inverter board was the cause why won't power on. by the way did you make a voltage checking at the power supply board does it have correct output voltages 5v,12-16v and the 24v.

Posted on Sep 19, 2012

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SOURCE: i have a vizio razor led m470vt. power light flashes dim to bright. no screen but have 120v into board. replaced power board but did not fix????

I have this same problem with my Vizio. Model E601i-A3
60" LED, believe. Maybe 64"

Anyway, the solution is much simpler than these other answers make it sound. 1) Unplug tv from wall.
2) Unplug all external devices (all HDMI ports, any cable hookups, any rgb/vga connections, and any speakers attached.)
3) Unplug USB drives/attachments.
4) Plug TV back into outlet.

It should power up just fine. Then you can go ahead and reattach all your devices WITH THE TV SCREEN ON, reattach your USB sticks and you should be good to go.

Every time the TV is moved or is unplugged for any period of time, follow these procedures. The real culprit is the USB drives - the TV, like many laptops I've had, can't boot up with them attached. Thankfully once the TV learns what they are they no longer have to be removed.

Posted on Nov 13, 2014

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