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I looked at the service manual for your TV, but it did not include a BOM listing the PSU component parts.

If you have a friend w/ access to a hackerspace, they may be able to help you determine what that IC does, or to adapt a compatible power supply from a different brand/chassis entirely.

I assume that Hitachi just used a range of compatible units and assigned them the same part number, since that is all the manual says about them.

Without being able to reverse-engineer the power supply unit to figure out what that part does (board scans, physical context, etc), my recommendation suggestion is to grab a compatible board from any model built on the same chassis, that should fit/mount in-place without too much trouble --
The only mechanical difference specified between power units for the -S602 and -A202/-A402 models is an additional pin on CN23 for greater Va capacity (presumably to support the higher resolution).


|Model Name / Chassis|Power (Supply) Unit|Part No.|Max Rating||
|:-|:-|:-|:-|:-|
|P50S602 / D8UF|Power Unit 1H439W-U|HA02592|571 W, 4.8 A|AC108 - 132V, 60 Hz|
|P50A202 / D8UF|Power Unit 1H445W-U|HA02602|480 W, 4.02 A|AC108 - 132V, 60 Hz|
|P50A402 / D8UF|Power Unit 1H445W-U|HA02602|480 W, 4.02 A|AC108 - 132V, 60 Hz|

• Service Manual No. 0235, soft paywall
  https://www.scribd.com/document/230093144/P50A202-pdf
  
  
• User's Manual, D8UF service manual not available here at this time.
  https://www.manualslib.com/brand/hitachi/plasma-tv.html#P
  
  ---
  Edit: The manual says it will also blink three times if it's receiving an IR signal from the remote, but I doubt that something on the remote control would have prevented it from turning back on. The manual does not suggest that as a possibility.
  
  ---
  edit, 1h later Hitachi's Amazon page also lists models P50S602 and P50V702 as using the (HA02602) power supply.
  I haven't x-referenced the manuals to confirm this, but the PCB bears the codes 1H438W 1H439W IH445W - so it seems plausible.
  
  https://www.amazon.ca/Hitachi-HITACHI-P50V702-P50S602-P50A402/dp/B008DIN422

This may not be the perfect solution for you if you're short on floor space, or if you're more interested in display rather than use; but I've been able to shoehorn three banquet tables into our guest bedroom, with three computers per table, all ready to use at a moment's notice.

The tables I'm using are the wooden type with folding metal legs, like these, but purchased second-hand on Craigslist. Some are a bit ratty, but they hold computers off the ground, so they do the job.

I'm wondering, though, if this is just the beginning of a bubble. Right now, people are paying high prices for these out of nostalgia; the machine they had (or couldn't afford, but desperately wanted) when these were new. Now they have the cash to buy them, and are hitting mid-life crisis time, so they're snatching these up.

This is me right now. When I was young I wanted all these machines and now I can. I write off all the expenses as cheaper than therapy. But at the same time it has fueled my passion for Computer History. I now find myself buying and reading books like The Home Computer Wars or Fire in the Valley.