Lg 42pc3d turns on and off repeatedly, have to unplug to stop

Hey, maybe you should try reprogramming your universal and see if that works. Might want to try testing all the codes that work for LG and see if they'd work. If that doesn't work, find a site like <a href="http://www.remotecontrolhookup.com/lg/">www.remotecontrolhookup.com/lg/</a> and see if you can find your original and buy it and try it out. If that still doesn't work, send it back and you may need to find a local tv repair shop to look at your tv rf sensor.

What you need is an exchange or repair of your ZSUS board:
http://www.coppelltvrepair.com/p/485/lg-42pc3d-zsus-exchange-service-for-dark-grainy-screen-problem

Your plasma TV has a power supply 6709900019A. These power supplies failed due to defective capacitors. See the picture below and check the capacitors mark with the red lines. There are 10 capacitors that should be replaced even if they do not show signs of bulging/swelling on top.
The value of the capacitors is 3300uF/10V but you can use 25 volts as long as they fit in the space provided by design.

Its very likely that you need to have LG perform a sodtware upgrade on your unit. Contact LG and see if your tv is one of the applicable units with software upgrade issues, please let me know if it works. Good Luck.

this tv is in caption text mode. go to captions and turn it off....

Theres a short between the start-up processor signal on the interface board and power supply. It keeps sending the same start-byte over and over again to the power board. This could also be a DC high voltage shutdown on the power board its self. Now the tv is in protection mode to prevent further damage. Get it serviced at your local repair center. If its under warranty take it back.

replace the power supply it is a simple fix if you can hear the relays click 2 times or more replace the power supply board you can order them from UNION Electronics ask for kyle when you call ,,if the power supply isnt the problem then it will be the control board located below the power supply board I have repaired a few of these the voltages are marked on the power sullpy board conections be careful there is a VERY HIGH AND DANGEROUS VOLTAGE FEEDING THE X AND Z BOARDS DONT REMOVE THIS WITH SET PLUGED IN IT IS HOT ENOUGH TO BURN A HOLE IN YOUR SKIN AND EVEN DO MORE DAMAGE TO YOU if your not sure what to do Call LG they have a good support theam there

Dave
Daves Tv

mainboard issue.

replace the mainboard and that should solve your problem.

I had the same problem with my 42pc3d, it had a new power supply put in it as a fix. Call LG Customer service.....They are very good and will fix it even if it out of warranty usually.

possible control module