Having problems with your Flat Panel Televisions ?

Have a Proview pa-19jk7. When you turn on the TV, the logo screen appears, then the whole screen goes blank. If I try it in a dark room, I can see the picture with a flashlight, and sound is good. I have taken it apart, and dont see any blown caps. I just dont know if its, the power supply, inverter, backlight. Are there any clues from the logo screen appearing first? Thanks!



Answers :

In this the the backlighting is done this way - the power source delivers an low DC voltage of around 24 volts to the inverter board , the inverter board ups that to about 500 volts DC and delivers them to the CCLF tubes (basically some thin neon tubes). If you get the logo in a bright lit screen at the beginning and later you don't get any error messages or blinking lights it means that the boards are operational and the problem is located in either the image settings (go into Menu - Video - Pic Mode and set it to VIVID) or you have a bad contact that breaks when heated.\012\012\012
For that you will have to open the tv, remove the boards and redo all the iffy solderings (push on the parts while looking at the pins, it will be a lot easier to spot the weak ones this way).
Hello,

This is not a power problem. The fault is from the inverter. The only job of the inverter is to bring light to the screen.

Now it is obvious that the inverter is defective because it is not bring any light on the screen. Since you can see the picture faintly, then the inverter is dead because it is not doing it's job which is to bring light to the screen.

As for the log which comes on screen, there is also every tendency that your TV has a "back light off" setting. You can use the flash-light to check the display setting on your TV and see if you would find any setting that has turned off the back light. If not, the inverter need to be replaced.

I hope you understand the above....

Regards.

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