Having the exact Sanyo model can help you a great deal when searching for help.
For reference and first approximation you can also check this:
http://blog.coppelltvrepair.com/2012/07/sanyo-dp47460-dp42840-dp46819-and.html
SOURCE: Sanyo DP15647 powers on but no display, trying to find fault
I had a similar problem like yours with a different TV. I had to find the Service Manual for the TV to really find the problem. The manual gives me every schematic and parts number list for every board in the TV.
It turned out to be a bad Inverter Transformer. It was one of six that powered the LCD screen. You might have the same problem.
The Service Manual on the internet for most TVs are under $20. It's the best material for diagnosing the problem. It worked for me.
SOURCE: i have no picture or sound, power light will come
I would get it fixed under warranty ASAP! not a good sign. If you open it, it will void warranty.
Please see my basic troubleshooting guide:
http://s807.photobucket.com/home/budm/allalbums
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://en.wikipedia.org/wiki/Capacitor_plague
Parts: try www.shopjimmy.com or Ebay
Testimonial: "thank you, i have called Sanyo and they are suppose to hook me up with a electronic repair place. and it be covered under warranty. this tv is 4 months old bought at W mart.."
SOURCE: I have a Sanyo 42 inch T.V. and it suddenly shut
call to the tv service center and do the required things my dear..........
plz dont try to repair it without any experts becoz tv when switched off also contains many voltage in it...
SOURCE: Sanyo DP50747 Replaced Power Supply still not working
this issue is related to either the y sustainer and z sustainer boards, checking the fuses on the y/b will giving you a good indication, if they are open(bad) then you'll have a easy fix, if not, i would try replacing the y board first.
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