I got lg pdp42v7 my problem is sparkle on screen I already put ysus and Zsus and also new logic replace all measuring and most all voltage are good somewhere I reed that I need to change some resistor on the logic change place but I can't find more information it will be great if someone can help me whit that

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.

there are 2 voltages that nned to be correct
if not they could be causing you problem ,and i hope that is the case. otherwise you willl need an epnsive panel replaced i would suggest you have a tech take a look

Today's Plasmas and LCD are more challenging to troubleshoot to the component level as most service techs replace the entire assemblies.
I would suggest to start by measuring the voltages from the power supply to the Ysus and Zsus board, those voltages will appear for a short time since the TV goes back to shutdown mode. Check all the fuses on the Ysus and Zsus boards as well, any blow fuse will indicate that a transistor or mosfet has shorted out. Most power issues are related to the Ysus and power supply assemblies.

first thing that you can do is use the Google serch by just typing in lg 50px1d and see if you get any thing close to what you need.

Available from tritronicsinc.com are the following:

6871QZH041A Zenith/LG Z-SUS Cost: $137.44
6871QYH036A Zenith/LG Y-SUS Cost: $238.38
6871QYH053A Zenith/LG Control Board Cost: $189.39

Hope this helps,
Dan

When a plasma has no picture I have found that 9 times out of 10 the ysus bd or the zsus bd has failed and sometimes both have failed at the same time. When you pull the back of the unit, you will find the the large pcb on the left as you look at the back is the ysus bd. and the bd. on the right side of unit is the zsus (it is about 1/2 size of the ysus bd. Check the fuses on both bds. and if one is open see if replacing will help. If it blows again the bd. that the fuse is on is most likely defective. The VS and VA voltages are listed on a tag on the inside of the plasma panel and those voltages should be checked. If either of those voltages is very low or missing, first disconnect the plug from the power supply to the ysus bd and check the voltages again. If the voltage comes up then the ysus is defective. If the v does not come up replace that plug and pull the plug from the power supply to the zsus bd and check again. If the v then comes up the zsus is most likely the cause. Remember to disconnect the AC to the unit b4 each step. Of course there are other possibilities and I alway reccomend that if your are not proficient with handling meters and AC and DC voltages then please contact a qualified service tech.

If the buffer drive bds. were replaced along with the ysus and zsus and this problem occured it is definately and defective pdp.

LG 42" Plasma TV 42PX3DCV Parts - YSUS ZSUS CTRL Part Number (set): 6871VSNB03E Part Numbers (individual): 6871QYH036D, 6871QZH041B, 6871QCH053G Part Number: 6871QYH036D Description: PCB ASSEMBLY, DISPLAY YSUS ASSY 42V7 FOUND THESE ON THIS: http://cgi.ebay.com/LG-42-Plasma-TV-42PX3DCV-Parts-YSUS-ZSUS-CTRL_W0QQitemZ110086231102QQihZ001QQcategoryZ116199QQcmdZViewItem HOPE IT HELPS