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Hi, the red convergence wont movein sync with the blue.ive seen loads about the stk chips, but whilst buzzing out for continuety round the amplification boards for the red green and blue boards, i noticed thast one of the leaded resistors had no continuety, on the red circuit. the resistor is R7721. colour sequence seems to go pink/light brown/grey(or olive)/brown/gold. do you think it may be this that is the problem?
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All projection TV sets have two very common problems. One is convergence ( 3D/Warped video or dead set) the other is CRT fluid ( Dull Video). Here are more details and solutions for both.
Common Problem #1) Convergence has gone out
Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. In some cases the TV will also not show any video. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.
This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.
Common Symptoms include....
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.
TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some pics of convergence problems.
Common 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.
Your Convergence ICs have failed. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.
Try This: When you notice the symptons Use this simple test to verify. Go to the users menu on the tv. Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.
If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section. If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.
If you can move both in each direction then the problem is something else.
Note if one STK chip fails, you replace both regardless.
Your Convergence ICs have failed. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.
Try This: When you notice the symptons Use this simple test to verify. Go to the users menu on the tv. Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.
If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section. If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.
If you can move both in each direction then the problem is something else.
Note if one STK chip fails, you replace both regardless. They will be right next to each other.
Your Convergence ICs are likely failing. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.
Try This: When you notice the symptons Use this simple test to verify. Go to the users menu on the tv. Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.
If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section. If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.
If you can move both in each direction then the problem is something else.
Note if one STK chip fails, you replace both regardless. They will be right next to each other.
Your Convergence ICs are likely failing or it is a bad solder joint related to that area. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.
Try This: When you notice the symptons Use this simple test to verify. Go to the users menu on the tv. Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.
If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section. If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.
If you can move both in each direction then the problem is something else.
Note if one STK chip fails, you replace both regardless. There may only be one STK chip in this set. If there are two, they will be right next to each other.
Your Convergence ICs have failed. Replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu.
Use this simple test to verify. Go to the users menu on the tv. Look for the converge option to align the red and blue colors
If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section. If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.
If you can move both in each direction then the problem is something else.
Note if one STK chip fails, you replace both regardless.
When you say "double" do you mean you see the colors somewhat seperated or see maybe blue or red outlines around objects? Does the screen distort? If so then: Your Convergence ICs are likely failing or it is a bad solder joint related to that area. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.
Try This: When you notice the symptons Use this simple test to verify. Go to the users menu on the tv. Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.
If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section. If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.
If you can move both in each direction then the problem is something else.
Note if one STK chip fails, you replace both regardless. There may only be one STK chip in this set. If there are two, they will be right next to each other.
Your Convergence ICs have failed. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.
Try This: When you notice the symptons Use this simple test to verify. Go to the users menu on the tv. Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.
If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section. If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.
If you can move both in each direction then the problem is something else.
Note if one STK chip fails, you replace both regardless.
Your Convergence ICs have failed. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.
Try This: When you notice the symptons Use this simple test to verify. Go to the users menu on the tv. Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.
If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section. If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.
If you can move both in each direction then the problem is something else.
Note if one STK chip fails, you replace both regardless.
the Convergence Ics are STK392-110 ICs you can get replacement Ics at the following link and they provide free instalation instructions. http://servicemanuals.vstore.ca/
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