Upon power-on, TV works fine, convergence fine; after about 5 minutes, green beam moves about an inch to the right, bends inwards on the left side [looks like ) ], and there are ripples in the beam around the bottom half. It fixes itself temporarily with the convergence being a slight bit off (can separate green, blue, red beams slightly), then comes back and sticks. Powercycling gets me 5 more minutes of functionality, after which it comes back. Occurs whether set is warm or cold.
Is it an issue with the STKs? Should I order replacement STKs (392-570) and pico fuses, or would the problem be somewhere else? Don't want to invest in the ICs if they're not at fault. Thanks =)
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Your TV most likely has one of two possible problems.
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.
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.
Convergence is dead.Must replaced 2 convergence ICS,and some or all it resistors.Can u do soldering electronics parts?Buy a convergence kit at websites Tv repair World.com,Tvrepairkits.com to repair it ur self.The shop will cost u $300 for parts and labors.
Hi, It would be great to assist you in Sony convergence issue. As you said, for some time TV shows bad convergence in picture that shows its matter of lose/ dry solder joints in D board, specially on convergence out ICs pins that need to be re-solder. There are 2 big black ICs mounted on aluminum heat sink on D Board of TV, below image shows D Board location in TV. Resolder pins of these 2 ICs and also check any other dry/ cold solder joints in circuit board. I do not think of IC replacement as problem occurs some time. Let me know if you have additional question. Thanks.
Not sure how service menu will help you other then to do more adjustments such as 3D reform and such. Not real sure, just a long wild guess but the coils on the picture tube could possible be loose enough to change positions when heating up causing picture alignment to change. Might be a cheap service call.