Question about Akai PTH5498 54" Rear Projection HDTV-Ready Television

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I have a similar problem, but the blue fluid in my pth5498 has turned yellow. I tried the website listed and it did not define if the "coolant" was green, blue or red. Where do I find the blue fluid? Do they sell it seperately or in a package of all three colors? Any info would help.

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All the coolant is the same.It is clear . After you remove the old coolant clean the face of the tube to remove the algae -like contaminate then install new fluid.

Posted on Feb 27, 2009

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


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.

Oct 12, 2010 | Samsung HCN5527W 55" Rear Projection...

1 Answer

Getting red, blue and green halos around images


I had a similar problem with red halos around images on my Hitachi rear projection TV. The problem was that the red convergence chip burned out. I replaced that and that fixed the problem. I found several forum posts on similar symptoms and fixes for Sony rear projection TVs by searching for "Sony rear projection convergence problem." Likely you've already tried the auto-convergence function for your set, if it has that.

Feb 28, 2010 | Sony KP-46WT500 46" Rear Projection...

1 Answer

TV blinks green then shuts down


absolutely, and if he spilled any of the fluid on the parts below the tube your looking at bigger headaches down the road, the coolant fluid is very caustic, stop running your tv and get a tech to check out your set right away, video-tek

Jun 07, 2009 | Akai PTH5498 54" Rear Projection...

1 Answer

I have the akai model # ptf492s and the white colors are yellow


I'm almost positive the problem is you have fungus in the CRTs. I know this sounds strange, but it's true. Basically there is coolant fluid in the lamps that develops fungus over time and turns yellow. It should be clear. If you take the back off the television, you will see the 3 lenses (red, green, blue) Each of the lens is held on with 3 screws. Remove the adjustable lens and look at each CRT. Shine a flashlight in they should look white. From what I've read, blue develops the problem first, then green. You can replace the fluid. Look up TV coolant replacement online. It's not to difficult, but you cannot get any of the fluid on the circuit boards or it will ruin it. Mine had a lot of fungus in the blue CRT and a little in the green. The picture looks 100% better now. Good Luck.

May 12, 2009 | Akai PT5492S 54" Rear Projection...

1 Answer

Red and Yellow blurred picture


I had the same problem this week. I tried the convergence thing but it was impossible to fix. I still needed the repairman. He changed two convergence units ($325, parts and labor). Then the tv was still doing the same thing. We had to adjust the convergence and now everything is perfect. You will need your converter

Mar 01, 2009 | Akai PTH5498 54" Rear Projection...

1 Answer

Convergence Problem


Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
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Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

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TV set after fluid change

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2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Sep 17, 2008 | Philips 55PW9363 55" Rear Projection...

1 Answer

No Blue.....whites are yellow


HELLO. IT SOUNDS LIKE IT COULD BE A COUPLE OF THING WRONG WITH IT. .!!! ONE IS YOU CRT GUN . MIGHT NEED TO BE REPLACED ,!! ! TWO IS YOU COULD BE HAVE A CONVERGENCE BORAD MIGHT NEED TO BE REPLACED OR MAYBE JUST THE IC'S ON THE BOARD NEED TO BE REPLACED. IT WOULD BE CHEPER .!!! IF YOU KNOW HOW SAULDERING GUN. "GOOD LUCK"

Jul 20, 2008 | Akai PTH5498 54" Rear Projection...

1 Answer

Color


Probably contaminated fluid in blue crt. Have experinced Samsung/Akai shop change and re-align. Probably cost $250-300

Aug 22, 2007 | Akai PTH5498 54" Rear Projection...

1 Answer

Yellow spots


As long as your convergence adjust properly the board has nothing to do with the new symptoms,yellow spots are associated with the blue picture tube,you can check for dirt on the face of the tube,you can check if the spots move like water when you move the unit to see if is short in fluid,be careful when checking with the back removed.You can cover the face of each tube to see if the spots are in the other colors.Let Us know if you need more help.

Oct 11, 2006 | Akai PTH5498 54" Rear Projection...

2 Answers

Shadowing


If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages. Looks like a picture tube problem. Try to reduce the contrast, maybe it will be better. Look into the three tubes while the TV is running, and observe the picture quality of the three. If the red and green are crisper and clearer, and the blue's all hazy from bacteria growing in the coolant, then the fluid needs to be replaced. The CRTs of the colors that seem hazy need to be removed from the light box to be serviced. The coolant needs to be drained, the CRT assemblies disassembled and totally scrubbed clean and refilled, then reinstalled and converged. If the coolant is clear, it can be a weak CRT. Also the convergence STK ships might need to be replaced, and the soldering checked. Good luck

May 08, 2006 | Akai PTH5498 54" Rear Projection...

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