Question about Hitachi 43UWX10B 43" Rear Projection Television

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43UWX19B DP1X Power Supply PWB Part #X901

HELP! I can't seem to find out what part this is? It was blown by a utility company's transformer failure that 'cross phased' and took out my TV amoung other appliances!
It shows the part in the service manual on the schmatic's but DOES NOT list the part in the 'parts list' in the manual?
Anybody know what this part is and where I can get it?
It looks like some sort of 'Double Protection Diode' since it links between the Hot and Neutral of the 120 volt in line.
I have a screen shot of the circuit from the manual here>>\X901.jpg
Tell me what you think?

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  • Super_user11 Apr 19, 2008


    YES! Well sort of anyway!

    The TV works fine but I probably should also put that component back in to protect the TV!

    Any Idea what it is? I am posting a photo of what it looks like! Can you be of more help to me as to what it actually is and where I can get it to replace it?

    I am also probably going to take the jumper off the board that is in place of the fuse on the neutral side of the A/C in and (the board has a place for a fuse on the neutral side as well as the hot side of the A/C in but there is only a 6A-250 volt fuse on the hot side of the A/C in.) I probably would not be here if the manufacturer would have put a fuse on the neutral side of the A/C in!!!


    Tell Me What you think!!


  • Super_user11 Apr 19, 2008


    Ya, I understand the concept of the double diode's but I wanted to replace it with the same component, the component is not listed in the Service Manual under the parts list, otherwise I would have both a part number and a rating of the component.

    I could just go out and buy a couple of high current diode's and put them togeather but I wanted to use what the factory used!

    Yes, my voltage is 120 volts. I am in the USA. Do you think you have the correct replacement part?


  • Super_user11 Apr 19, 2008


    Thanks for all your help! At least I can head in the right direction and the TV STILL WORKS!! Although I was kind of looking forward to getting a new LDC or Plasma 1080p!!

    Thanks Again!


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The part you seek is the varistor it is a surge protector and as saved many units from the very thing you discribed. the part # is AJ00322 you can get it from as well as the service manual.

Posted on Apr 23, 2008

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The purpose of the part is to take the overload to hopefully avoid more damage to the TV.
Try to disconnect that part from the circuitry, just to see if the TV works.
Let me know if you need further assistance.

Posted on Apr 18, 2008

  • 1 more comment 
  • Jaime Hernandez Apr 19, 2008

    That part is like connecting 2 diodes with their cathode together and the anode to the AC line.

    I have those parts if you need it.

    Let me know where to send it to.

    Is your AC voltage 120vac?

  • Jaime Hernandez Apr 19, 2008

    Great you understand all of this.

    I would suggest to call Hitachi and ask them for that particular part if they have it. I have seen many TVs like this but I did not come across any that had that particular part. They had other surge suppressor components but not the Diode Gun.

    These components were used in designs around or before 1995 but lately they have a different circuitry to protect against lighting.

  • Jaime Hernandez Apr 19, 2008

    I do not have the exact part you are lookinf for.



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