Lg tv no picture but sound

My LED TV has sound, but no picture. - Tom's Guide

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TV Has Sound But No Picture Troubleshooting Guide ...

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Aug 31, 2012 - Uploaded by Repair.com
Here are some steps to ease you through TV picture loss-from prevention ... But now when I turn on the tv there only sound nopicture. ... had sound etc. with very very faint picture if you look very closely (which I was). .... How To Fix Samsung LCD TV -Samsung TV Repair (Blank Screen) - Duration: 9:21.

Samsung LCD TV No Picture but has Sound - Electronics ' DSLReports ...

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usually bad power supply, Where did you source your part? return/exchange it. Bad LEDs/ possible but not as likely, Tcon working if you can see images with flashlight. You must also have backlight on signal from main board ,check for 3 to 5v on labeled connecter on power supply. UPDATE---47" & 50" LN series. This model has had LED problems if your TV acts as described by Mr. Hughes in is answer to this problem you have bad LEDs

suspect either a back light power board issue or main power board to back light board issue...also, is it under warranty ?

Get real close to screen and maybe use a flash light to shine on the screen and see if you can see the picture still, it will be dark and almost not visible but you should notice something move. If your screen has picture then you most likely have a back light problem. Most common problems are bad inverters, or the inverter controller card. possibly a bad power supply but most likely inverters, test each circuit, replace as needed.

What does it do if you unhook the flat cables going from the tcon to the panel, does the blinking go away and do you have sound then?

Hi,
It seems back light inverter board is not producing voltages to lit the back light inside lcd panel to show the picture on lcd screen.
Please replace back light inverter board to get tv fixed. Local tech will help you if you are not familiar with tv repair.
Thanks.

Could be whats called the backlight inverter. Mine did the same exact thing. Ordered a new inverter and works fine now. i'm not a very techy person, but was able to remove and install myself! Got one at the link below...not cheap though..sorry.

The inverter in the link is for a Westinghouse 32" SK32H240S

http://www.lcdparts.net/InverterDetail.aspx?InverterNumber=4H.B0700.051

The inverter is out a very common problem on that unit. www.lcdrepair will fix the unit for $59

Does the lcd screen have a glow to it ? Or is it really dim if u get real close to screen u can see images moving ?
it it has a glow to it you panel lighting is fine but you control board is bad. If you have a dark screen and see faint images you panel back lighting is out u can check the power with a meter at the connection to inverter board on panel.

Sounds like the Z-sustain board went bad. You will need the board replaced so make sure you find an LG authorized servicer.