Question about Hitachi 60V500 60" Rear Projection HDTV-Ready Television
TV produces a loud humming sound as if there's a cooling fan that's working extra hard. The problem is sporadic in the sense that it can run for several hours without making any noise and then it can also produce the noise when it has just been running for a few minutes. The temperature light has not come on at all, but the noise is getting more frequent. Is it a cooling fan and if so, is it separate or is it part of the engine assembly(meaning all inclusive)? Any easy solution or is this going to require a professional technician?
PS....we're on our second lamp (replaced over six months ago), the noise problem has surfaced in just the last 3 weeks.
The noise in question relates to capacitors, which are (unfortunately) largely dependant upon environmental elements. You most probably find that when outdoors is wet and humid, there is no issue, but the moment the sun is out and it drys out, your problem rears its ugly head again. This is a basic fault and should be able to be solved by a standard TV tech shop, as its in short, humidity dependant. To explain caps, are moisture based electric storage devices; under normal circumstances the chemicals react ideally to provide the expected volts and or current. Alter the environment subastantially and the cheaper versions will not adapt and they will put the unit 'out of spec' as a dryer environment will produce less volts/current and more humid environment will make it perform closer to spec. Its a sod of a feature but thats earth. :) Higer class ie Class 'A' components tend not to suffer dramatic changes and produce more reliable results.
To sum up, the loud humming is caused by out of spec components or for that matter dried up used up components, the fact it runs for hours at a time is most likely weather dependant and if not its likely to be a dry joint somewhere on the board. These are also unfortunately largely dependant upon environmental conditions. Best of luck. :o)
Posted on Dec 26, 2008
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