About 2 days ago, the picture (we still have sound) went out on our little tv. When we switch stations, the picture appears for about a 1/2 second and then the screen is once again black. Any ideas? Everyone wants a fortune just to look at it...
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It sounds like you aren't cycling fully. It sounds like you are on the TV (RF/Cable) input, then you switch input to Component 1 (for your DVD) and watch the DVD, then hit the input selector again, switching it to Component 2...you need to keep switching the input until you are back on the TV / Cable input.
Try with that... http://www.filestube.com/3c4e959f7e53ba6703e9,g/PHILIPS-42PFL7932-LC420WU5-V2-CIRC.html
Symptom: Sound but no picture.
Cure: Master or Slave inverter is defective. It can be that the driver IC is defective or MOSF inverter transformers, or 470uF 35V C Replace driver IC BD9897FS or MOSFET's. 996500046243 IC BD9897FS 996500046242 Mosfet FDD8447L 996500046241 Zener KDZ100V
Check your input connections, especially the HDMI (if in use). I have found through personal experience that the weight of the cable and any small vibration can be enough to loosen the connection and leave you a blank screen. The manufacturers would have been smarter to have all the inputs face toward the floor at the bottom of the set (like the power cord). Anyone who has mounted their set to the wall will understand what I am saying.
That being said, you may be better off saving your money and buying a new LCD TV. The Zenith sets have proved to be a ticking bomb. If you Google "pop" and "z50px2d" you will read a number of posts on various boards that indicate that the Zenith plasmas have about a 2 year life expectancy before they are in need of some very expensive service. And frequently even after they are serviced are prone to further failure.
Someone pointed out to me not to long ago a valid fact: LCD technology has been around since the pocket calculator and therefore much less prone to unexpected failure than the relatively new plasma technology. I just wish someone had told me that 2 years ago when I ponied up $3000 for my Zenith z50px2d that blew out a few days ago.