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LG LED model# 47LB5800-UG. Black screen, full screen flashes every few seconds. Audio OK. LEDs appear to be lit when screen flashes. Sounds like LED driver or inverted board and/or connecting cable?

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The Knight

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  • LG Master
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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 Sep 22, 2016

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lukster

Luther Stephens

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SOURCE: half screen activated only

When only a half screen is produced, it is usually a upper or lower buffer board, if the top half is blank then it is the upper buffer, and of course if it's the bottom half then it's the bottom buffer board

Posted on Feb 17, 2007

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Anonymous

SOURCE: TV turn on for few seconds then turn off.

This TV has a network of diodes connected to a PROTECT-1 line monitored by the control IC. If any circuit pulls this line low, the control IC turns the system OFF. The diodes act to isolate all the circuits from each other, its called a diode-OR circuit.
You can troubleshoot by opening a diode which disconnects a circuit from pulling the line low. I had a hunch the EL backlight board was bad, so after opening that protect line the power stayed ON.

I found a bad .068uF 250V cap on the transformer primary, it measured .002uF. I've replaced the cap and the other two on the other transformers just for good measure.

It probably took more time than the TV is worth, but my friend's Mom will be happy, and thats worth it.
I hope this helps, look around for the service manual, it can be found online.

Posted on Jan 15, 2008

Chi Chu

  • 8457 Answers

SOURCE: LG 50 IN. PLASMA TV MODEL # 50PC1DR . POWER

Power supply board is dead,replaced the power supply board will get power.

Posted on Jan 27, 2010

GySgt2u

  • 63 Answers

SOURCE: Philips 42PF9630A/32 Plasma TV RED led blinking 7 times

Are there any blown caps on the PSB-power supply board. Most sets have sammy boards and they used very shotty caps. If there are no visual clues being a poped cap at the top (X) they simply often do vaporize and dry out. The YSUS-Main and the 2 Y buffer boards control the picture OSD-on screen display. Your not getting any of that. So power supply is where you start first. The YBU-upper and the YBL-lower control the upper and lower OSD the Ysus main control both of them. Usually if you have one in the door you have to replace all 3. But not always. If you were to replace any of the boards I would replace the YSUS-Main, or get the board reworked at a pc repair shop that does board level test and repai. Its more cost effective.

Best Regards and Semper Fi

Posted on Aug 03, 2010

rbhome

  • 126 Answers

SOURCE: I recently viewed a few solutions to a problem

did you try shopjimmy.com?

Posted on Oct 26, 2010

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Many LG TVs of this age are starting to fail due to over-worked LEDs in the backlight which create the white light that illuminates the LCD image.

The symptom is TV turns on and off ok, gets sound on the connected video inputs, but has an otherwise black screen with no video on display. You can try to operate the TV near a bright window with lots of sunlight and see if you can perceive a faint image on the screen. A flashlight is often not bright enough to be helpful.

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