Question about Hitachi CMP4121HDU 42 in. Plasma Television
Internal speakers may be switched off, I/O PCB may be defective, also check the voltage from power supply to audio (I/O PCB) to be sure you have the 12-16VDC necessary, if you have it the power supply OK & most likely the I/O PCB. could also be the speakers themselves(not often both go out together, but possible, can be checked with an ohmmeter) Also be sure to check connecting cables & source..ie. cable or satelite box.
Posted on May 08, 2014
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Posted on Jan 02, 2017
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