Question about Hitachi 55HDX99 55 in. Plasma HDTV
It is really hard to fix sets like this without voltage checks, but if you have any led lights flashing this may tell what is wrong with your set. Also if there are lights in the back of the set that are flashing on the logic board or the Digi-Main PWB But usually with a bad digi-main you have audio, also check the buffer board and see if any holes lie in the buffers. These are the boards on the far left side of the set looking from the back. The buffer chips are the black square IC's sometime you will see chip pieces out of the buffers. This mean that one is bad.
Posted on Feb 28, 2011
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