You can remove the fuse and check them with a multimeter. put a lead on each end If the meter shows a low number (normally less than 1), then the fuse should be okay. if not than you need a new power supply board. be sure at all times to have tv un pluged while working on them and always be very cautious as the do still hold power. hope this helps
SOURCE: stand by light stays on only black screen
mainboard damaged.
replace the mainboard and that should solve your problem.
SOURCE: trying to replace t-con board on a 47lg50 lcd tv,
As soon as you take the back off the set, the t-con board is located at the top middle of the set under some shielding.
SOURCE: "Function Not Available" error on LG 47LG50 LCD TV
A software upgrade may resolve the issue if not the main Pcb. would need replacement.
Contact LG during normal business hour 8-6 central time.
1 800 243-0000
They may help you out also let them know if you are having a lipsync issue.....Wink wink
SOURCE: No power going to LG 42 inch plasma, tried
Hello,
since you have change the fuse in plug, this indicate that your plug is okay, the likely problem is from the television which will require you to open the television to check for fuses, bulged capacitors, but if otherwise your power supply is dead.It can be dead at anytimes.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Hope this help.....
SOURCE: my 47lg50 has black screen when i turn on but
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
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
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.
Or www.digikey.com just make sure to use caps with low ESR, 105c rating such as PANASONIC FM or FC series.
Please post back what you find.
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