Question about LG 47LG60 LCD TV
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
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Posted on Jan 02, 2017
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:
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
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
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.
Posted on Sep 26, 2010
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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