Samsung s42ax-yd01 - No picture / Sound OK problem

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. Do a search by type in the brand name of your device at its search box. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/

no philips of that model are made by LG

If you go to www.encompassparts.com and click on guest log in and do a part number search with the numbers you have listed, except use LJ41-02761A, and it will give you the cost and such.

samsung.com

I have the same issue.
I'm looking for the power supply schematic.
Some components are dead (like U501 and ZD501).
I'm looking for the reference of the zener. Does any body have the schematic or the part list of the board (ref PSPF501B01A) ?

it unusual to have the screen go faulty itself. With plasma screens what goes is a power transistor, and there are 3 or 4 of these on one of the circuit boards. The likely board is the one with the big heat sinks as the power has to be stepped down to a lower voltage before it can be used properly. It is best if you replace all of the power transistors as one may have affected the other. If you are no good with a soldering iron then either get someone else to do it or replace the whole Circuit Board (PCB). Beware there are plenty of people aching to make a quick buck out of people who have no knowledge on this technology. If you want someone else to do this for you then find someone honest. A telltale sign for the power transistors is that they sound a pop when they go faulty. A symptom is a blank screen sometimes showing on standby mode. I would say your screen itself is ok, so sell it on to someone who needs to replace a physically damaged/smashed one if you no longer need it.

Ok first lets start with the half screen and no lit screen . Samsung plasma panels (S42AX-YD01) HD V4. are really bad about the Y-board (upper,lower) buffers are really bad about getting hot and burining up. If u remove the back cover of TV u will see on the left side the Y-board (it will be marked in small letters) if u look and the rows of IC's with heatsinks on the buffers will be a dark yellow. Majority of the time if u remove the buffers. and look underneath them u will see the solder has melted from the board. U can replace the Y-board and buffers and the TV will work fine.
Next part if u have vertical lines in the panel. There is not much u can do as a repair. Only thing u can do is get panel replaced. because there is and IC that is burned up on the panel, and trust me there isn't anything u can do to fix it. If u want to see for yourself. After removing the back cover, remove SSB, and brackets holding PDP in place. at the bottom of TV there is a row of buffers marked E,F,G, ( i think) there is a long heat sink covering the IC's at the bottom connected to the bottom of PDP. As u can see without a $70k machine to change this there is not much u can do with it. Hope this helps.