Question about Samsung HCN5527W 55" Rear Projection Television

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Can i realine the lens myself it has a yellow tint and yhe lettering is out of focus

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If you have yellow coloring on everything, this is not a lens alignment problem. Either you have a color balance problem (weak blue) or the coolant fluid in one or more CRTs is going bad. The coolant liquid is supposed be clear, but with age it breaks down and turns yellow.

First, unplug the set and remove the back. Use a mirror if you have to, but look down at the top of each CRT using a bright light. They should be colored red, green or blue, with no yellow to muddy the color. That's a quick check on the coolant condition.

You can replace the coolant, but be very careful not to spill any inside the set. Broken-down coolant can short out electronics and cause a lot of damage to the circuitry, especially in the high-voltage sections. Some people prefer to remove the CRTs from the set for this process, but that is a considerable amount of work. Others use kits with pumps to remove the coolant, and work inside the set with reasonable precautions - if there is enough room. There are a number of good tutorials on-line, or at least there were when I last looked two years ago.

I recommend getting the color right before attempting the focus. Bad coolant may scatter the light and fuzz up the picture, so check that out first and post back what you find.

If you have yellow fringes on otherwise normal colored objects, the blue convergence is off. This will also make lettering appear out of focus. Most RPTVs have a procedure for bringing up a convergence pattern (a grid of dots) using the remote control. The dots should all be white or have very little color fringing. Follow the directions, and make small adjustments, then check the effects all around the picture. Correcting one section may cause a change elsewhere. Use a ruler to make sure the dots stay in the right place; otherwise you may end up with a distorted picture.

Caution to other readers: do not try to adjust convergence if you have a "bow-tie" shaped picture in one or more colors. This indicates a convergence amplifier failure, which must be fixed first.

Posted on Oct 12, 2010

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  • Samsung Master
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This problems,is not any lens problems.This problems is known as a convergence problems,it dead.Tv colors lines R,G,B mis alignment,have colors shadows pictures or 3D pictures.The tv convergence board the 2 STK convergence ICS and some or all it resistors are dead.These parts on the tv convergence board,must be replaced to solved the tv picture convergence problems.Try website like Tvrepairworld.com to buy a whole rebuild convergence board for the replacement.The Samsung/Akai DLP tvs used the same convergence board.

Posted on Oct 12, 2010

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The letters you're referencing is the M/A (manual / auto) focus switch. The lens has this switch and operates in Auto Focus mode when set to "A" and manual focus mode when set to "M".

You have to manually focus on the subject when in letter "M". If you do not, the result will be out of focus. From your description, it sounds like the camera / lens combination is attempting to focus and operate the shutter in auto, and focusing in manual; but due to some type of damage resulting from possible mishandling, exposure to dust, dirt or even moisture is interfering with the successful completion of the process.

You could isolate the problem to determine if the cause is in the lens or camera by simply attaching the lens to another compatible Nikon camera or placing a different auto-focus lens on your D40. The problem will either stay with your D40 or follow the lens when attached to a different camera. It is also *possible* that due to numerous attempts of auto-focusing with your D40 & lens combination, that both the lens *and* the camera have been damaged. If the problem is severe enough, the problem in the failed device could cause failure in the otherwise normally working device, too.

You might be best served by contacting Nikon Service & Support below:

http://www.nikonusa.com/Service-And-Support/Service-And-Repair.page

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http://support.nikontech.com/app/answers/detail/a_id/14157/session/L3NpZC9YRTgxQVpKag%3D%3D/kw/D40%20manual/p/19%2C334/c/187/r_id/116678/sno/0

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