I have an lg 42pq30 plasma tv the main input board went bad causing no audio.. i replaced the board with same part number .. it now has sound but the picture at the right is off the screen good 20% of picture missing.. did reset under picture.. no help.. any help thanks.

Sounds like it could be a bad connection. Is the socket good? Are the plugs going into it OK?

Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

if your Tv have sounds but no picture,,try to replace the y sustain board.

You can locate it near the power cable that gets connected into the power supply board. But, please take care, as you are touching areas where power can still exist even if you unplug the TV.

I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.

you need the set up remote, part number 105-301-m . in start mode press tools button, rt click until your model shows up. the main board is for several size screens. HIT enter when you see your model number.
Please post feedback

yes is the 2 top & botton board connect to Y board control is bad need new one
Most problem on plasma TV is heat & burner some component, about 80% is 2 top & bottom board connect to Y board is come in bad

Your set should be under warranty. This could be a clocking circuit that is out of sync, or some other processing device that is out of frame sync. To service this at board level, if it is not a standard factory known fault to correct, or if it involves extensive SMD work, the board with the fault will be replaced.

Jerry G.

Call LG for service may need firmware upgrade or new main board.

You can get the manual on link below. Go to support then look under documents on right side to download manual.

http://www.lge.com/us/tv-audio-video/televisions/LG-plasma-tv-42PQ30.jsp