Question about NEC Projection Televisions
Sounds like you may have some bad filter capacitors in the convergence board. Better take a close look at them before they damage the chips. Good Luck
Posted on Jan 07, 2008
SOURCE: lg 37 inch lcd has
reseat the LVDS cable inside the set. this is the multi wired connector that connects the main board to the panel. if that doesn;t solve your problem replace the main board. if you turn off the set and you can still see it in the screen it is the panel.
Posted on Feb 15, 2008
See if the vertical line appears when you press the "Menu" button on the Magnavox. Also, see if the line appears when you watch a dvd on the maganavox. If it does not appear, then the problem is the cable wire or cable/satellite box. You can reset the cable box and the TV by powering them both off, and leaving them unplugged for 20-30 seconds, and then replugging. See if that works.
Posted on Apr 16, 2008
SOURCE: I have a sony wega
This is one of Sony's issues they are having with the optical block.
random line pattern, or road-mapping), red bands, and others. They usually become evident after about 4,000-10,000 hours of usage--typically about 2-6 years after purchase, depending on the frequency and conditions of usage. Unfortunately, it is not cost-effective to have the optical block professionally replaced out-of-warranty (~$900-$1,500 total for diagnosis, part, labor, and taxes).
Generally, the 2002-2005 models had 1-year parts/labor express warranties, and the 2006-2007 models added a 2-year warranty on the optical block (still with 1 year on labor). In response to the problems, Sony issued extended warranties to cover replacement of the optical blocks for all of their 2003-2007 models, except the 2005 3LCD models. Similar problems have been reported with 2002 models, but there are very limited numbers of these first-generation models. Some models (WE and XBR950 series) are also susceptible to being warped, melted, cracked, scorched, and or burnt due to excessive heat from the projection lamp, which can cause the TVs to fail to power up and could be a safety issue. This issue is under warranty through March of 2011.
Unfortunately, the extended optical block warranties generally only continue the coverage through about 3-4 total years of ownership (depending on the purchase date), which is far less than the expected, marketed life span of these premium TVs, and many customers experience the failure only after the extended warranty has expired. In addition, the replacement optical blocks, which only have a 90-day warranty, appear to suffer from the same, or similar, latent defects as the originals, so they tend to fail after similar amounts of usage or sooner. In many cases, it has been reported that the replacement optical blocks are bad out-of-the box or within a few weeks to months.
The television image is created by projecting light from a high-intensity mercury vapor arc lamp onto three small (approximately 1" across) liquid crystal panels inside the optical block. There is one panel each for the colors red, green, and blue, and they are combined with a prism and enlarged onto the back of the large viewing screen with a projection lens. Depending on the TV model, the optical block is based on one of two liquid crystal technologies: conventional liquid crystal display (LCD) technology ("3LCD" models) or liquid crystal on silicon (LCoS) technology ("SXRDTM" models). All of the 2002-2006 and some of the 2007 models use the WEGATM video processing engine and are generally known as Grand WEGAs. The remaining 2007 models use the newer BRAVIATM engine and branding.
The discolorations arise due to degradation of parts within the optical block assembly during long-term exposure to heat, light, and/or dust. The high-intensity lamp is attached to the optical block, and it creates a lot of heat. In addition, it creates intense light, much of which is converted to heat inside the optical block as it is filtered. Some of the light-filtering parts, including, in many cases, the liquid crystal panels themselves, utilize organic dyes or other substances that are subject to degradation from heat and light, particularly light in the high-energy blue light path (e.g., UV and deep blue). Also, the optical blocks are not sealed, so dust can accumulate on the internal parts, which can further reduce cooling efficiency, as well as directly cause discolorations.
I am going to pasts some more repair options for this, as you might want to contact your local Sony people and see if they are willing to help on this. If you decide you want to change this out on your own I can give you instructions and advise on the repair as well.
Posted on Feb 23, 2011
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