Convergence problem???

Feb 15, 2009

- Here are some photos of the two most common problems with the video.

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.

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.

Solution #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.


TV set after fluid change



Solution #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.

May 15, 2008

- ICERUNNER OVER AND OUT.... GOOD LUCK!

May 15, 2008

- WARNING! If you don't have any electronic experience this is not for you, I assume no liability for any harm that may come to you or your tv. Perform this procedure totally at your own risk. High Voltages exist in your tv and on the boards I am going to talk about, and can have high voltages on them even after the tv is unplugged. WHEN IN DOUBT, HIRE AN EXPERT!!!

(taken from the link)

The Parts:
The parts you will need are two ic's that are referred to as STK ic's. This is in reference to the first three letters of the part number. You will also need some pico fuses. The pico fuses are little yellow fuses that look like resistors. When they blow, they will show no physical sign of failure. The amperage rating will be printed on the fuse. For example a 5 amp fuse will have the number 5000 on it. A 3.15 amp fuse will have the number 3150 on it. You will need to use an ohm meter to test these fuses.
If your set uses either STK392-110, or STK392-120, you should replace them with a higher wattage part; either the STK392-150 or STK392-180. Since this is a very prolific problem, there are allot of companies that make cheap bad ic's that can be purchased usually for around $6.00 - These replacement ic's are BAD, they will FAIL on you again. I have had allot of experience with this problem, please listen to my warning! Only get a set that is from a reputable manufacturer. If your ic part number is something other than the ones I mentioned above, ONLY use the EXACT same part number for replacement. The part number is boldly printed on the part.

May 15, 2008

- The Location of the parts;
The stk ic's are on the "D" board, attached to large heat sinks, When looking from the back you can see the heat sinks but the part's themselves will be pointing away from you and hard to see without removing the board, or using a mirror to look at the part numbers. The fuses are generally located under the fins of the heat sinks. There are several of them and vary by model. On the "G" board there will be two yellow pico fuses near the connector going to "D" board. These fuses provide power to the stk ic's you must check these as well.
The Repair:
When replacing the STKs make sure you use heat sink compound on the back of the ic's before installing them. Also as a rule of thumb, screw or clamp the ic's down to their heat sinks before you solder the pins. Replace any blown pico fuses and re- install your boards. When you turn your set on it may still be out of convergence due to many factors. Try pressing the auto focus button on front of your set. If this does not work, you will need to do a convergence. Please see my article "Sony Convergence Procedure" to complete this part.
Possible Problems after the repair;
Many things can happen during your repair, the most common problem and one that even I - an experienced tech still have problems with are not plugging in all the wires. This will cause various strange problems. So if the set acts differently than It did before. First suspect that you have missed a wire. Don't assume that you got all the wires in. it is extremely easy to miss one. I have had people and techs tell me "I am sure I plugged in all the wires" but when I investigate a little further we find that wire that was hidden behind something else and once we plug it, all will be well. Another issue you need to be aware of is if you are in convergence mode and you cannot move one of the colors in either vertical or horizontal directions. Re-check you pico fuses and solder. 99% of these problems are due to either shorted pins or a missed pico fuse.

May 15, 2008

- NOTE in full disclosure all my comments are not mine they were borrowed from the link