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Re: ZENITH BLOW`S FUSE
You have a direct shot in the power supply check the rectifier diodes (4 of them) or check for shorts to ground other components. check the HOT for short between emmiter and collector, and base and collector.
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Check and replace the backlight inverter board. If you wish to get more details, check this link. It has screen shots to faulty LCD screens, and details about it. http://electronicshelponline.blogspot.com/
Pull up previous posts by its left sidebar, or type in thebrand name and model number to of your set, to its search box, and
press 'Enter' or view it in Mosaic / Timeslide
Assuming that you don't even have a standby light on the led. Here are some DIY steps that may help you fixing the problem.
Check the power cord - check the cord it might be opened (no continuity).This is due to frequent bending and pulling.
Check the internal fuse - sometimes the fuse fail because of the power surge, replacing with new one cure the problem. However if the fuse blew again then this is an indication that you have a shorted parts on the power supply. If no reaction and still the unit didn't power up then you have an open parts on the power supply.
If the fuse is intact then you have a faulty in the power supply or on the load. You might have an open fusible resistor,open volt regulator ic, shorted H-out IC.
The #3 should be done by an expert or qualified technician because isolating the problem on the regulator section is technical.
But first check if the unit is under warranty then avail it because the manufacturer will fix it for you for free or a little charge only. Have a nice day! Thanks for using fixya.