Question about Toshiba 46H84 46" Rear Projection HDTV-Ready Television

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Colors are suddenly bad-- Too, much green and yellows ?? I have replaced Lamp unit in the past-i Usually is just goes dark. This time the colorsare messed up Is the Lamp Unit the problem , again.? Toshiba model #- 46HM84 serial # 20604189

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Hi,

This seems like a convergence problem.Follow these steps to repair your set, however.. Remember to unplug the set, and stay away from the flyback transformer (looks like a car distributor sort of) and all of the large gauge red wires coming from it (1 to 4 of them, depending on the set) - they can stay charged even when the TV is unplugged!..

If you remove the back of the set, you will want to look for the BIGGEST heatsink in there - it will look like a large aluminum block with fins, on that heatsink, you will see 2 large IC's , probably STKxxx-xxx If I remember this set correctly..

You can go on E-bay to order the new I.C's, but MAKE SURE they are Genuine SANYO IC's and not counterfeit $12.00 cheapies. The cheap ones may only last 2 minutes or two years.. If you want GENUINE Sanyo's, buy them from

http://www.servicemanuals.vstore.ca/

You will also need some "Heat transfer paste" , a soldering iron, and Solder wick- 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,I only really recommend doing this if there are visible signs of a hot spot. 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 you need to order a resistor or two, go here! :

http://servicemanuals.vstore.ca/index.php/cName/convergence-resistors

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!



The fuses in a TV differ, some look like regular glass fuses, some look like a resistor - but nearly all of them will be noted with an F in the component number - EX: a resistor would be marked "R103" for example - a fuse would have a F denotation, like "F103" - usually there will be writing on the board with the fuse size... like 1A 250V.

If this all sounds too complicated, a normal charge for this sort of repair is around $300.00

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Sep 14, 2010

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