Question about Sony KP-61HS10 61" Rear Projection Television
At first the picture was getting a little blurry. Not to the point that you couldn't see the picture, but noticeable. Pushed the alignment button in the front panel. Fixed it for a while then it returned back to blurry. Then one morning it "popped" and the picture was curved. Aligned again, the red and blue aligned and the green did not. The green is off alignment top,right and bottom. I am very handy and do beleive I can fix this if told what to change. Please help, thank you for your time.
WARNING! If you don't have any electronic experience this is not for you, 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
This sounds like the convergence circuit going bad
I would highly recommend you get a service manual for your set, if you don't have one already. You can download one from manualsparadise.com (https://www.manualsparadise.com/ShowProductsForModel.do?model=M36698595) .
While you are reairing clean the refelective mirror inside you TV. You have to open back cover and than top cover to clean mirror and also dont forget to clean CRT lenses ,they are mounted facing upward ,you may find a lot of dust sitting on CRT lens, clean the 3 of them ie r.g.b..
What has normally happened is that the convergence output driver ic's either one or both of them has shorted. Causing your picture to be un-converged, The Symptom of your failure can take on many different looks, so one explanation of what the failure looks like will not be adequate. It will be basically one or more (red,Green,Blue) crt's are not aligned correctly, and colored shifted, and distorted picture of some kind will be seen. Auto focus will not fixit and may even make it worse. When these ic's short, they can cause one or more pico fuse to blow. Allot of people ignore this part of the repair and get themselves into trouble. Please listen to my warning, and make sure you check these fuses!
About the boards:
The two boards we will be working with are the "D" and "G" boards. They will have a big "D" or "G" stamped into them. On most models the "D" board will be to the center left of you when looking from the back. The "G" board will usually be to the left of the "D" board and standing vertically. When removing the board make a mental note of where all the plugs go. The Flyback (the big gray transformer near the back) has a fat red wire coming out of it. To remove this wire push down and twist on the distribution block side. Don't try to remove it from the flyback side, you can damage the flyback. There is a focus wire going upto the focus block as well, pull the wire straight out of the focus block side. But if you have enough room to work behind your television you can leave the red and focus wires in the tv, just flip the board over at the television after removal.
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.
After you take out the bad convergence IC's YOU MUST apply a generous amount of heat sink compound on the backs of the new IC's. Failure to do so will lead to premature breakdown of the convergence IC's due to excessive heat not being dissipated away from the iC's.
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.
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.
more info link
STK ic pic
Posted on Dec 28, 2007
You say you pushed the alignment button in the front panel but it just fix the problem for a while.
Try turining your TV on, leave it on for about 20 mins, after that push the alignment button, Now that the TV is warmed it might auto correct the problem,
try that and let me know if it dosent work
This might also help. Its the manual if your interested:
Posted on Dec 28, 2007
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