|Finally received new backlight bulb replacement ($10) and installed it. Mailing time about 7 days; Hong Kong, eBay vender.|
It resolved the problem: the left side quarter top-to-bottom shadow effect, which was slowly developing/moving to the right of the screen during an 8 hour daily usuage over a weeks time. Upon installation however, I noticed the new bulb showed a brighter (brightish) area on immediate lower left corner of screen, obviously caused from improper placement of the bulb. It was improperly placed in one of its end holders at bottom of screen. The placement of each wire lead is critical. One wire goes underneath its holder, not aside or atop at starting point of bulb unlike it does on opposite end of the bulb. There's less than a 64-inch tolerance; and, I needed to solder the leads (careful -- solder quickly using minimal heat). In re-positioning its placement, however, I BROKE THE NEW BULB. But now I know the cause, the solution, and the importance of proper placement of the bulb; so, I ordered a new bulb.
Wishing you the best. Thank you.