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About a year ago my XBR34 did the same quit. The board in question is the AZ board on mine with only one chip. Somehow I found a refurb board on the web and try as I can looking thru old emails I cannot find the seller. If you can find the proper Sony # for the board you may have a chance. About $170. The refurb board was full of Sharpie marker markings as if someone tested at various points and Sharpied it to OK.
I left mine in place in the den on top of an Orthophonic Hi-Fi I use as a stand. Cool looking on top of 1959. I tilted it to a corner wall and balanced it up there to pull the back. Not too bad. Then setting it down I undid 24 connectors and swapped the board. Not hard to do...no two are the same. The surgery was about 3 hours and all is well. After moving it around above the iron in the Orthophonic, the purity was off. My trusty degaussing coil took care of that. And I have the original to re-use after I swap the IC someday.
Hands down it is the best HD set made and I have been doing color broadcasting for a long time. Nothing better than Super Fine Pitch color phosphors.
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“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
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