Question about LG 47LG60 LCD TV

1 Answer

Sometimes this TV turns on and has audio but screen stays black until it is turned off and then back on, sometimes more than once.

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  • Jack L. Tapp
    Jack L. Tapp Oct 29, 2012

    Back2life, are these problems easily addressed and or cheap to fix?

  • Back2life Electronics Oct 30, 2012

    If it is indeed faulty capacitors, they are easy and cheap to replace if you have soldering skills.

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  • LG Master
  • 933 Answers

I would suspect a problem with either the inverter circuit, or 24vdc circuit. I would start with checking the power supply capacitors. Look for any with bulging tops. Research shows your set is from the 2008 era, many sets from that time were built with cheap Taiwanese capacitors. I've repaired quite a few of the older LG LCD with your same problem. They all had faulty capacitors in the power supply.

Posted on Oct 29, 2012

4 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

budmrtn
  • 11361 Answers

SOURCE: I have a 2007 LG 32 inch flat screen TV model

It can be cold solder joint in the power supply or component failure after heating up. You should do this when the screen is black out to help narrow down the problems.
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.

Please post back what you find.

Posted on Nov 11, 2010

welcomejee
  • 10594 Answers

SOURCE: My LG 50PC5D has a hard time turning on. when

Hi,
It seems issue with power supply board and most probably few electrolytic capacitors are dried up and causing problem.
Qualified local tv repairman visual check is needed to confirm the reason of problem as he will test/ check output volts of power supply.
If this tv is 3-4 years old then problem would be in power supply board as mentioned above.
Let me know if you have additional question.
Thanks.

Posted on Sep 26, 2010

  • 2187 Answers

SOURCE: LG 42lb5d has audio but no picture.

They may have missed out the power supply circuit. There may be loose solders or bad parts. You may have eliminated other parts which may have caused the problem when the service center replaced the parts. Inspect those that you still have remaining for leaking capacitors, loose parts or loose solders.

Posted on Oct 27, 2009

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