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...

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My jeep is overheating off and on what could the problem be the coolant bubbles in the filling resovur

you may have head gasket issues. Have a shop do a Block Check. They will use a blue fluid to test for combustion gases in the cooling system, if present, the fluid turns yellow and you have head gasket problems.

Sep 01, 2010 | Jeep Liberty Cars & Trucks

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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


I've had this same problem. First of all, replace your radiator (or coolant recovery tank) cap. If this doesn't fix the problem, check your hoses for leaks that could be letting air into the cooling system.

If the coolant is eruption is violent upon shutting off the engine, check your oil to see if you've got a chocolate milk like look to it. If the engine is completely cold, unthread the oil drain plug just a little until fluid starts to escape. It may be coolant that comes out, or it may be oil. Finally, rent a Block Tester from Autozone (It's $25.00 refundable upon return of the tester) and some Block Test Fluid ($8.99). Run the engine until on the high side of operational temperature with the radiator (or coolant recovery tank) cap removed. Insert the rubber cone into the filler neck and place the aspirator (bulb) on top of the tester. Squeeze repeatedly (yet slowly) for two minutes. This will pull air from the coolant into the tester and eventually the fluid will either remain blue, turn green, or turn yellow. Depending on the fluid, it will turn green or yellow. If it turns either color, you have emissions/combustion gases in your coolant. Unplug one cylinder head's spark plugs and repeat the test to see if that cylinder head is the problem, replug and repeat the test with the other cylinder head. This will tell you which side of the engine is leaking the gases into your coolant.

Positive (green or yellow fluid) test means that your head gasket is blown, or you have a cracked/warped cylinder head or engine block.

Jul 06, 2009 | 1992 Jeep Cherokee Sport

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My shogun 2.8 is loosing water

cookie2188 makes a good point, but you can rent a test kit from Autozone ($25.00 to rent the tester- you get it back upon return) that tests for combustion/emission gases in your coolant (it's called a Block Tester). You have to purchase the fluid for $8.99- it takes a small amount of test fluid to perform the test and the test fluid you purchase will allow you to perform multiple tests. Run your engine until it is on the high side of operating range and put the tester cone in place of your radiator (or recovery tank) cap. Put the aspirator (bulb) on top and squeeze slowly for two minutes. This pulls air from the coolant into the test fluid. If there are combustion/emissions gases present, the fluid will turn green or yellow (each brand will turn a different color but always green or yellow). If it turns a bluish green you've got some leakage of combustion gases in your cooling system and probably have a bad head gasket, but if it turns green or yellow you definately have a bad head gasket if not a cracked cylinder head or engine block. To narrow this down, unplug the spark plug wires for one head and redo the test- repeat by plugging in the first side and unplugging the next. This will tell you which head/gasket is the culprit.

Jul 05, 2009 | 2003 Mitsubishi Outlander

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

No Blue.....whites are yellow


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

1 Answer


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


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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