LG 42pc3dv-ud snow in picture

SOURCE: sound but no pic

The Lg you have actually has three boards that can cause the problem you are talking about. The control board, the y-board or the z-board. Usually most technicians will change the y-board and z board together since it is usually a combination of both that cause the problem. The control board by itself can cause the problem. The part #'s are as follows and these are straight from the LG plasma tv training manuals. 1- Control board 6871QCH053G, 2- Y board 6871QYH036D, and the Z-board is
6871QZH041B. The boards can be checked by looking at the voltages and signals but as I said some of those problems for no picture interrelate between boards. Hope this helped. Also with the back cover off those boards are clearly marked. The y board is a small board on the left and the Z board is on the right. The control board is of course in between them. They have tiny white stickers with the part # and assy# on them an also directly on the board itself. Always disconnect the power cord when looking at the inside by taking the back cover off.

Jim Goldsmith

• 2005 Answers
• Posted on May 20, 2009

SOURCE: TV TURNS IT SELF OFF AND ON I HAVE A LG 42'' MODEL 42PC3DV

You have a bad start relay in the power supply Replace it

SOURCE: LG 42pc3dv-ud

Yes you need to replace the board LG 6871QYH048B. The board has a short. Check the fuses and one of them should have no continuity
because it is open.

Replace that board and problem solved

SOURCE: i have a lg 42pc3dv plasma tv. it made a loud pop

Looking at it from the back, the board on the left is the ysus. You should see a big red cable coming from the power supply board in the middle of the set going to the ysus. Near the red cable plug on the ysus should be a fuse. Most likely the fuse has blown. If it is you need a ysus PCB. Check out encompassparts.com. If you get a new board be sure to set all the controls on the new board to match the old board. If you don't you will have little sparkles all over the screen when it comes back on. I hope this helps. You may want to check all fuses on the power supply and the zsus which is on the right side of the set. I have seen both the ysus and zsus be bad together. Good luck and thanks.

SOURCE: LG 42PC3DV-UD turns off/on by itself. Is this a

Power board have dead capacitors,like puff up or burst open,these capacitors must replaced.Know how to solders?Or replaced the whole power refurbish power board.Tries Shopjimmy.com,Ebay.com.