Question about Hitachi 42HDS69 42 in. Plasma Television
Your set could have three separate power supplies or they may be combined in a single unit.
One supply is on as soon as the AC cord is plugged in; this one must stay on so the set can respond to a signal from the remote. Another supply (or section) services the majority of the circuits and may have several different voltages produced. Finally, a third section or separate supply produces the high voltage for the plasma display.
The supply that is always on, evidenced by its response to your remote's 'power on' command, is OK.
The high voltage supply may derive its service voltage from the main supply which also supplies the bulk of the circuits and all of the outputs are likely monitored.
The main supply is often the culprit when it fails to start up. This kind of failure is quite common and attributable to the use of cheap capacitors (called 'electrolytic' capacitors) in power supply circuits that are handling higher frequencies that can cause breakdown of the chemicals used in them. They tend to shrink in value and reach a point when their value is no longer high enough to perform as it is required to.
Unless you have some technical skills, I recommend you contact the Hitachi service center nearest you and request the potential cost of replacing the failed power supply board or having yours repaired.
If you really wish to delve into the guts of your set, comment back to this thread and I will guide you in some simple troubleshooting steps.
Posted on Jul 27, 2010
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Posted on Jan 02, 2017
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