Question about Mitsubishi VS-70705 70" Rear Projection Television
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Posted on Jan 02, 2017
SOURCE: Mitsubishi VS 4552A
One of your convergence IC's has either cracked loose or burned out. The IC will have to be resoldered or replaced and then the convergence circuits realigned. If you do not have experience in repairing convergence circuits then have a qualified tech handle it for you. This is by far the most common failure in the projection sets and a good tech can have it fixed in about an hour and a half. I charge $150 for that but shops in your area will vary, so call around.
Posted on Jul 31, 2007
you need new convergence ICs. If you can respond to this same post and verify the model number of your mitsubishi, I wll post the correct ICs that your model needs.
Posted on Aug 17, 2008
Your screen has gone crazy on you because your convergence IC's have gone bad.
These IC's operate at a very high temp, and usually only last 4-5 years.
If you remove the back of the set, you will want to look for the BIGGEST heatsink in there, on that heatsink, you will see 2 lage IC's , probably STK392-110, or STK392-150's or something close...regardless - you can go on ebay to order the new ones, but MAKE SURE they are Genuine SANYO IC's and not counterfiet cheapies. the cheap ones may only last 2 months..
You will also need some "Heat transfer paste" - you can pick this up at radio shack. Once you remove the old IC's, test all the large resistors near them.. pull one side of the resistor out of the board so you can check it out of circuit. they will usually have the value in Ohms, printed directly on the resistor, but you may have to use the resistor color code to find out what value they are....However, usually if there is any damage, the resistor will look like it has been HOT or fried. replace the IC's and any bad resistors, and you should be good to go. If after replacing the IC's and any defective resistors, the convergence is still bad, make sure to use a multimeter to check ALL fuses on the boards, --- sometimes when the IC's go, they will take out a fuse to the convergence power supply. If you find any bad fuses, replace them accordingly! If this STILL doesnt make it look right, you will need to find out how to get into service mode and do a coarse convergence adjustment. This information can be found in the Service manual for your set. If you dont have one you can download it at servicemanuals.net Hope that helps!
Posted on Jan 01, 2009
Yes, this model uses a single STK-393-110---IT IS A 2001 MODEL.
If I remember it correctly the IC will be on a huge metal heat sink on the far left side of the set (as you look from the back) there is also a small IC on the same heat sink.
Not the most easy set to do this repair on and if you have a problem with the blue--it may not be the chip.
I have seen 3 or 4 of these where the problem was broken connections on a 10 or 12 pin plug at the left front of the board----
The way someone would pursue this is get the entire chassis up so the bottom of all the boards faces the back of the set--The plug goes to the convergence yokes this set uses---I have seen several where several of the pins had broken loose from the circuit board--normal with expansion etc.
If I was repairing it I would look at the plugs in that front left area FIRST! The last one I fixed had bad connections on TWO plugs---with the board up they will be clearly cracked or ringed--broken loose--if the set for some time would be good and then go bad it is most likely a solder problem.
Resoldering is much easier than replacing that chip!
if it is not resoldering the Chip can be purchased on Ebay for about 14 dollars plus shipping.
If you have someone come out tell them what you know---The plugs (as you look from the back) are up front and towards the left side
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Posted on Nov 11, 2009
Projection TV sets have several common problems listed below.
Problem #1) Convergence
Problem #2 CRT Fluid has clouded over.
You can see more examples and find a fix here...
Posted on Mar 25, 2010
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Problem with Hitachi 51F500 51 in. Rear Projection HDTV-Ready Television
i want to learn how to do convergence on my tv its a hitachi rear projection i have problums with colors not aligning,could you lead me in the right direction ps: i don't have the remote so i
can't magic focus
Posted by ejaparks on Mar 03, 2011
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Your convergence has failed and needs to be repaired. Once quick test is to goto your convergence menu and see if you can adjust red and blue. If not its has failed and needs to be fixed. You can call in a repair shop or you can get the parts and instructions from www.TvRepairKits.com and do the repair yourself. Its a fairly easy DIY fix.
Here is an example photo....
Jul 04, 2008 | Philips Magnavox 9P6034C 60" Rear...
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