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Re: Thanks for your help with the Mitsubishi WT 46809...
Fuses and IC's are soldered in on large PC board in center of chassis.... Your model is a tight fit that is usually repaired by chassis pull first, then board repair, normally by a skilled Mits tech........
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Replace both of the Convergence ICs, they are Big Black ICs and will have PN# on them.
STK392-110 ,also check the pico fuses in front and back of ICs they will look like resistors only they are Green or Yellow 5amp, 6amp,7mp fuses.
Mats Electronics has ICs and supplys 1-800-628-1118
STK 392-110 cost $9.95 each
Hi, This sounds like the most common thing that fails on projection TV's, regardless of the brand. The convergence circuit has two, or sometimes three STK IC chips mounted on heat sinks to drive the convergence yokes. They typically last anywhere from 5-10 years, then they fail.
It sounds like in your case, the solder joints on the bottom of one of these chips may be failing and some fresh solder will make it go for a while. I would recommend you to replace both the STK chips. These ICs are used to align and keep aligned the three colors on the screen...
INSTRUCTION TO REPLACE CONVERGENCE ICs:
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
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.
Your STK parts might not be your problem for blinking red led. As I have read throughout other forums, the first think to address is your power deflection board .....that's the first one that goes. If it is the first time, it might be that only a couple of fuses on that board go bad, I had the same problem with mine, as I remember correctly, F850 and F852 were bad....I replaced mine and had tv for 12 months when a storm caused the whole power to go on and off a few times and screwed up my set and now more parts on power board are messed up. I'll replace mine in totality.
Convergence STK's will tell you when they go bad because you will notice something with your picture right before they give in. But in your case, you can't turn your set on.
Try to put your hands on info that tells you about codes on that blinking light. I tried to find that kind of info but I didn't try hard enough. I wish I have it, it could save me a ton of headache.
Hope this helped. Nic