Question about Toshiba 50H82 50" Rear Projection Television
My tv has a blue "rainbow" effect on the bottom half of the screen. It happened quite suddenly. It was fine when we turned it off and the next time we turned it on, blue rainbow. A local tech suggested a convergence issue, but more details would be great. Thanx for any help. Vinnie
Yuor tube amy infected .open your tv case then remove all dust from it.replug al connection .
try to dry the circuit .
Posted on Oct 03, 2008
Although this is a different model TV, the site offers you pictures and details on how to locate and replace the convergence IC's.(Make sure you use STK392-110 chips and not STK392-180 as shown in the site):
You can buy replacements here and they also provide free installationinstructions and free on line tech support so you can do the repairyourself:
If are unsure how to do this, try to get a friend who knowsthis kinda stuff to do it for you, or get a qualified technician.
Warning:If you do not have a background in electronics repair, or are inexperienced,get a qualified technician to do it for you.
REMEMBER there are very dangerous voltages inside a TVthat can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECTTHE POWER BEFORE YOU DO ANYTHING.
Hope that helps! Should you have any further questions,please post them here.
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Posted on Oct 03, 2008
Yes it is convergence problem.. IC804 controls red convergence. But in time IC805 will also fail as well. Replace them both with STK392-110. Also, check for cold solder joints in the vicinity of these ICs. You need to replace following ICs, may be 2 pieces in your tv for convergence problem. IC, STK392-110T
Toshiba Part Number: 23135090X
Please search on net for availability in part stores
Posted on Sep 28, 2008
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