Question about Toshiba TP50H60 50" Rear Projection Television

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Every so often my television screeen picture shrinks to a poin where the picture is squished. it usually lasts until I turn the TV off and turn it back on. Same issue with mine. It started where the top and bottom of screen would bow in a little. That would come and go for several months. Now in the last week or so I turn the tv on and it's fine for a few minutes and then it squishes down from the top and up from the bottom to about half the screen size and bowed top and bottom.

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  • zb68730 Mar 25, 2009

    I recently bought a TP50H60 toshiba that has the same problem (hooray for craigslist!). When I pulled the back off there was an excessive amount of dust. I assume this hasn't been cleaned since it was made in July of 1998. Could the dust cause this problem alone or will I still need to use the same fix?

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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 STK392-120'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 Dec 22, 2008

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