Picture but nosound - LG 42LB1DRA 42 in. LCD Television

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

The audio is getting to the speakers from the AV terminal board. I would suggest to check the audio settings on your TV even after doing factory settings.

how many blinks from the LED? that will determine where to find the problem.

Hi there,

I am going to just have a few guesses at your problem as "nosound" doesnt really clarify it enough =]

If your onboard sound isnt working, You could try looking for an audio driver for this particular motherboard. Google "Intel D865GRH Onboard Sound Driver"

If you are using audio ports in a computer Case, make sure they are connected correctly to the motherboard, or use the audio ports on the back of the board.

Onboard sound does break on some of these older boards, Try using an external soundcard. (PCI or AGP) or a USB one. I picked a 7.1ch USB soundcard up off ebay for $8 and it works fine on all my old motherboards.

Hope this helps you, Best of luck.

Check your TV seelected correct input source

Bad caps in SMPS.

Since you lost both sound and picture, I would suggest to take a look at the power supply for bad filter capacitors, look for bulging on the top of capacitors. If the backlight inverter board is bad you should still get the sound.

Try leaving it unplugged from power for an hour to force a system reset on the unit.

Goto www.magnavoxhelp.com. They have a kit that will fix this common problem.

Do you have high voltage? Check by turning up one of the screen controls to see if you have retrace lines.(pinstripe diagonal lines across the screen) If present turn the screen control back down until the lines just disappear. Check diodes 6003, 6012, 6025, and resistor 3669. If you don`t get a retrace line by turning up the one of the screen controls, check for missing voltages or shorted components in the horizontal output and power supply circuits. Note: Philips TV`s can be tricky even for experienced technicians. Good luck