MY Zenith plasma TV Z42PJ240-UB has sound but nothing on the screen

A common practice in the TV industry is to include the size in inches in the model number. Often, a model will be made in different sizes, for example, z42pj240 may have a z50pj240 family member. They will use the same main circuit boards and remote controls. Check the list in your universal remote control manual for a variant like that.

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That is the small board in the TV that has the inferred sensor located on the board, it may be a little hard to find though, but if you can find one it won't be expensive, most the times when sets are scrapped out that board goes in the garbage because it has a really small failure rate.

Have you checked the various power supply voltages?...are they all correct?

Yellow is the video connector.. if you don't have a yellow connection on the TV, try the red, green and blue till you find one that works. You might also need to change the input to get it to work.

video control board remove back panel and look for bad capacitors

Press and hold lock button ten seconds

hi the power button might be underneath the tv or a touch screen panel

regards
shaun

First I would make sure you're on the "media" input setting. Then if it still won't read, I would try a generic thumb drive without the software and see if that makes a difference. Sandisk has added software protection that is hard coded into the thumb drive and it may be interfering.

Sounds as if a cable connection is bad. Check the cables first. If cable are good, change inputs, if cables are bad replace cables. If it's component, make sure that red, blue or green didn't come loose on both sides...the tv and the source. If you still have problems, check for red video noise on the screen itself, preferably when it's on but with on input (black) If you notice this, your plasma is failing.