SOURCE: no signal when hooked up with a digital cable box
I had the same problem and had the cable guy out and everything thinking it was my box. I figured it out by myself here is what i did to fix it. I have the vizio 32 inch hooked to an hdmi cable and through the cable box i had the aspect ratio on 1080i and i should have had it on 720p once I switched it I havent had the problem since.
SOURCE: Insignia DVD Player, Insignia TV, HDMI connection doesn't work
well a good hdmi cable should cost you over 100 dollars, so try a new cable. even though it looks like the cable is fine, it can be no good.
SOURCE: My Sanyo DP32648 was plugged into a surge
If you look at the power supply board as shown in the picture: http://assets.shopjimmy.com/media/catalog/product/cache/1/image/5e06319eda06f020e43594a9c230972d/s/j/sjdps153ap1a.jpg
There is a main fuse on the top left of the board covered by black shrink tubing, SLO-BLO 4A 250V. Check it out to see if it is blown.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Please post back what you find.
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