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Posted on Jan 02, 2017
I had this same probelm. I called for service, and the Tech needed to change the fluid which costed ~$170. The picture now is as good as new!
Posted on Jan 09, 2008
I bought a crappy old magnavox and rebuilt it. I had both of these issues.
Since your tv is old, the blur problem is probably caused by old coolant in one or more of the CRT lens couplers. Hopefully, the lenses are simply out of alignment, but no one has ever worked on the tv, then this is unlikely.
First, unscrew the back panel of the tv console (should be a bunch of 1/4" hex head screws). There will then be a large white panel at a 45 degree angle held in place by two tabs or maybe even screws. Remove it to see the CRTs. A quick check for the blurry problem is to look directly into the CRTs while the tv is off. DO NOT do it while they are on if you can help it, as it is not good for your eyes.
Shine a white LED flashlight down into each of the CRT's top lenses. Avoid classic incandescent light in this case, since you will be looking for the difference between white and yellow. I you see a white plate inside, good. If the inside looks yellow, and has floating things in it, then the coolant fluid inside is old and bad. You can replace this, but it is a VERY delicate task and MUST be done in certain steps to avoid ruining the electronic boards anywhere within splash zone or drip reach of the lens couplers. The coolant is a special blend available at most tv repair shops, but it's basically clear antifreeze (which you wont likely find in an automotive store).
For the color being off, it is most likely the gain on each CRT being out of whack. First, change all of the user settings (in the on screen menu) for image, color, sharpness, etc to the middle or default.
With the back panel off, somewhere near the bottom of the inside there will be a small black plastic box with wires coming out the sides. This box should have 6 knobs on the front of it (the face facing the rear of the tv); 2 rows of red, green, and blue knobs. These are the screen controls for FOCUS and GAIN. And they should already have some sort of label telling you so.
I placed a mirror in front of my tv so I could see the screen as I adjusted, but you might be able to see it somewhat by hanging a sheet over the front of the screen and looking at it from the inside.
There's a much more in depth method to do this that is described in the service manual (which you are likely to have seen by now; they are usually either stapled to the back of the tv or hanging somewhere inside and easy to see)
But basically, just turn the knobs gently around until the picture looks about right to you. (Remember, if you turn them all up super bright, the CRT will not last very long. Try to keep the knobs near the middle of their turn ability)
If you want to do a full out overhaul of the screen, you'll have to make a lot of adjustments with a bunch of little knobs (variable resistors, really) on the computer board inside. The service manual will tell you what each one corresponds to, but most of them will have a subtle label on the board.
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Posted on Mar 23, 2008
SOURCE: no color adjustment
*CONVERGENCE SERVICE MODE PROCEDURES*
*Note: This procedure is required for all of the following geometry and
*Using the remote transmitter, enter the following seven-button sequence to
activate the convergence mode.*
* 06 - 25 - 97 - Menu (M)*
*The "Opening Menu" will appear offering choices:*
*Use Channel up/down to*
*Select a Channel with Video*
* Remote control key functions:*
* Use arrow up/down and left/right: Adjust Convergence*
* M: Advance "cross" location*
* Up, Down, Left, Right*
* 3: Exit Convergence*
* Status: Abort/Cancel Changes*
* M: Begin Convergence*
*Note: video information must be present to correctly adjust the
convergence. A signal source is required to lock the vertical and
horizontal sync. After entering the "convergence service mode" verify the
presence of a video source by confirming the presence of active audio (use
the volume up function on the remote). Use the channel up and down function
on the remote to select the desired tuning source.*
*Select item "M" from the first menu, the "Convergence Menu" will appear
featuring 5 possible selections.*
* Channel 3*
*1. green geometry*
*2. red To green Convergence*
*3. blue To green Convergence*
*4. green To red Convergence*
*5. green To blue Convergence*
* Status: Abort/Cancel Changes*
*CONVERGENCE TOUCH UP PROCEDURE*
*1. Enter the "convergence service mode" as described above in the
"convergence service mode procedure".*
*2. Select the desired color requiring adjustment. Note: Do not
select Green Geometry (1). This procedure is described under "Major
Convergence/Geometry Alignment. If Green Geometry is altered during this
procedure a "Major Convergence/Geometry Alignment" maybe required. *
*3. Cover the Output Lens of the single color presently NOT being
adjusted. Example: If you select Green to Red Convergence (4) cover the Blue
*4. The highlighted adjustment Icon (Cross) should be illuminated on
the middle left side of the screen. Make the necessary Convergence
Adjustments using the following Remote Keys:*
*· Use the Arrow Up ( ) to adjust the selected color up.*
*· Use the Arrow Down Key ( ) to adjust the selected color down.*
*· Use the Arrow Right Key (-) to adjust the selected color to the
*· Use the Arrow Left Key (+) to adjust the selected color to the
*5. Move to the next location to be converged. It is not required
that the full Convergence Sequence be followed while performing the
"Convergence Touch Up Alignment Procedure". The following alternate Remote
Keys allow for positioning of the Icon to the desired adjustment location:*
*· Key 2 on the Remote Transmitter will position the Adjustment
Icon upward on the screen.*
*· Key 8 on the Remote Transmitter will position the Adjustment
Icon downward on the screen. *
*· Key 4 on the Remote Transmitter will move the Adjustment Icon
to the Left.*
*· Key 6 on the Remote Transmitter will move the Adjustment Icon
to the Right.*
*6. Return to the "Convergence Service Menu" by selecting Key number
3 on the remote transmitter or by sequencing the Icon to the last adjustment
point at the lower right corner of the screen and pushing the Menu (M) Key
on the Remote Transmitter..*
*7. Repeat steps 1 through 6 for other required Convergence
*8. To Save the Adjustment completed in the last procedure,
Exit/Save the Convergence Service Mode by selecting Key 1 on the Remote
Transmitter. This forces the corrections to be written to the EEPROM on the
*Note: To save the convergence corrections made above you must exit the
convergence menu by selecting Exit/Save Data (1)*
Posted on Jul 05, 2008
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
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.
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.
TV set after fluid change
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.
Posted on May 19, 2009
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