You need a technical service manual/with schematic for that model an is only available at the Manufacturer website.

Try this link: http://losercoalition.net/blog/2008/03/envision-en-7220-19-lcd-disassembly.html

It's a step-by-step with good pictures and seems to solve most user's problems. I did the fix and still have the same issue, though while it's on for the 15 seconds, the picture has never looked better. I replaced two 1000 uf and three 470 uf caps...and all the old ones had no physical appearance issues, so unless I see another solution, this one's headed to the scrap heap. Sniff.